TENDER DOCUMENTS FOR - Cescoorissa.comcescoorissa.com/tenders/ps96/Vol-II-Tech_spec_Ayakara_Bhawan _1_.… · TENDER DOCUMENTS FOR Construction of 11kV Line from 33/11kV Sishubhawan

TENDER DOCUMENTS

FOR

Construction of 11kV Line from 33/11kV Sishubhawan Substation to Ayakara Bhawan at Cuttack, Odisha

Volume – II

Technical Bid

CENTRAL ELECTRICITY SUPPLY UTILITY OF ORISSA (CESU)

IDCO TOWER, 2nd Floor, Janpath, Bhubaneswar-751022

TELEPHONE: (0674) - 2542895, 2545681, 2541727

FAX: 0674 – 2543125

TENDER NO: CESU. H.Qrs./P&S/523/12-13/24764/Dt: 30.07.2012

Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha

Central Electricity Supply Utility of Orissa Page 2

CENTRAL ELECTRICITY SUPPLY UTILITY OF ODISHA

(CESU) Head Office: IDCO TOWER, 2nd Floor, Janpath, Bhubaneswar-751022

TELEPHONE: (0674) - 2542895, 2545681, 2541727

FAX: 0674 – 2543125

BID ENQUIRY NO: CESU. H.Qrs./P&S/523/12-13/24764/Dt: 30.07.2012

BIDDING DOCUMENTS



BID DOCUMENTS CONSIST OF THE FOLLOWING VOLUMES

VOLUME- I (COMMERCIAL REQUIREMENTS)

1. Section – I :-Invitation For Bids - IFB

2. Section – II :-General Terms and Conditions

of the Contract - GTCC

3. Section – III :-Price Schedule Format - PSF

4. Section – IV :-BID Proposal Letter - BPL

5. Section – V :-ANNEXURE - ANNEX

VOLUME-II (TECHNICAL REQUIREMENTS)

1. Section – I :-General

2. Section – II :- Porcelain clad 11kV Switch Gear

3. Section – III :- 11kV UG Cable

4. Section – IV :- HT cable joints and terminating kits.

5. Section – V :- Cable Laying Methodology

6. Section – VI :- Lightning Arrestor

7. Section – VII :- 11kV AB Switch

8. Section – VIII :- Proposed route map

VOLUME- III (BID PROPOSAL SHEETS)

1. PART – A :-PRICE SCHEDULE SHEETS WITH BOQ



Section-I

General



1.0. INTRODUCTION:

The CENTRAL ELECTRICITY SUPPLY UTILITY OF ODISHA,

hereinafter called CESU/OWNER is inviting Bids in respect of Total Turnkey Package for

construction of 11KV UG Cable DC Feeder (Main + Standby) by using 3x400mm2 ,11KV, XLPE

Cable from Sishubhawan 33/11kV S/s to Ayakar Bhawan at Shelter Chhaka, Cuttack, Odisha on

Total Turn Key basis including supply of all Equipments/Materials Erection (including Civil

Works), Testing and Commissioning as per the Scope detailed in the Bid Documents.

2.0. NATURE OF WORK:

The work covered by this Specification is for 11kV distribution lines as specified herein and in the

attached Schedules. The Underground distribution lines will form a part of the CESU’s distribution

System.

3.0. SCOPE:

Construction of 11kV Line from Sishubhawan 33/11kV S/S to Ayakar Bhawan at Shelter Chhaka,

Cuttack, through underground Cables and accessories.

The work Involves:

a) Establishing additional 11kV Terminal bay with all 11 kV switch gear equipments and other

modification works at existing 33 /11kV Substation at Sishubhawan, Cuttack.

b) Laying of double circuit of UG cable (Main + Standby) using 3core x 400mm2, 11kV, aluminium,

XLPE insulation armoured dry cured power cable for a Circuit length of 1.85km(double ckt.).

c) Installation of 11KV metering unit at the proposed 6 pole structure at Ayakar Bhawan.

d) Erection of 11 kV Lightning Arrestors (6 nos).

e) Erection of 2 set of 400Amp,AB Switch unit.

f) Straight through Jointing kits (3 core/ 3 phase) with Heat shrinkable type suitable for

11kV class, 3 core 400 sq. mm HT, XLPE UG Cable (22 nos)

g) Jointing of Indoor terminating end kit (3 core/ 3 phase) with Heat shrinkable type

suitable for 11kV class, 3 core 400 sq. mm HT XLPE UG Cable (2 nos)

h) Jointing of Outdoor terminating end kit (3 core/ 3 phase) with Heat shrinkable type

suitable for 11kV class, 3 core 400 sq. mm HT XLPE UG Cable (2 nos)

i) Installation of 4 sets of earthing Device with Earthing pit of 2.5 mtr. long excavation for

end termination of cable (including supply of 40NB, 3mtr of GMS pipe, 80mmx12mm

Earthing GI strip, Salt & charcoal).

j) Erection of rigid PVC pipes of size 200 mm diameter of length 25mtrs.



Bill Of Material for construction of 11KV UG Cable DC Feeder (Main + Standby) by using 3x400mm²,

11KV, XLPE Cable from Sishubhawan 33/11kV S/s to Ayakar Bhawan at Shelter Chhaka, Cuttack,

Odisha on Total Turn Key basis

Sl

No Particulars Unit Quantity

1 Supply of materials for new 11KV bay one no at Sisubhawan S/s with CT,

PT, Breaker, Isolator & Structure etc. No 1

2 Supply of materials for Underground Cabling work

i) Supply of 3core x 400mm², 11KV XLPE Under Ground Cable (2 runs =

Main + Standby)( Cable supply =(1.85 x 2)+ 16% extra =4.3km) Km 4.3

ii) Supply of Cable Jointing kit (3 core/ 3 phase) for 400mm², 11KV XLPE

Cable (straight through) Nos. 22

iii) Supply of Cable Jointing kit of Indoor Terminating (3 core/ 3 phase) for

400mm², 11KV XLPE Cable Nos. 2

iv) Supply of Cable Jointing kit of Outdoor Terminating (3 core/ 3 phase)

for 400mm2, 11KV XLPE Cable Nos. 2

V) Supply of Earthing materials for cable with 2.5 mtr. long (including

supply of 40NB, 3mtr of GMS pipe, 80mmx12mm Earthing GI strip, Salt &

charcoal).

Nos. 4

Vi)11KV ,AB Switch 400Amps Set 2

Vii)11KV, LA at both terminating end of cable Nos. 6

Vii)PVC Pipe for cable erection at 6 pole structure,200mm dia" mtr 25

3 Supply of Materials for installation for 11kV Metering Unit at the proposed 6pole structure

i) 11KV Metering Unit No CESU

Supply

ii) 11KV LA Nos 3

iii) 30mm GI Pipe Mtr 12

iv) 2.5mm² ,7core armoured control copper cable for connecting to meter Mtr 15

v) TP Box for HT TV Meter (out door type) No 1

vi) 30mm GI Bend No 2

vii) 30mm GI Socket No 2

viii) 30mm GI Elbow No 1

ix) 100 X 50 X 6mm MS Channel MT 0.13



x) 50 X 40 X 6mm MS Angle MT 0.02

xi) No. 6 GI Wire Kg 2

xii) Nut & Bolt of different sizes Kg 6

xiii) Earthing Device (40mm dia GI) with materials nos 4

xiv) Sundries for Ampere Tape ,PVC Tape, Sockets etc. LS

4.0. Methodology:

The complete procedures for the execution of the project are explained herewith in details.

i. Detailed survey of the area and routes from Sishubhawan 33/11kV S/S to Ayakar Bhawan

at Shelter Chaka, Cuttack, as shown in the Geographical diagram / Schematic diagram of

the tender document and preparation of fresh Geographical & schematic diagrams showing

the position of Laying of Cables to be done by the bidder.

ii. Complete manufacture, including shop testing & supply of all materials / equipments from

the approved vendor or from his manufacturing units.

iii. Providing Engineering drawing, data, operational manual, etc for the Purchaser’s approval;

iv. Packing and transportation from the manufacturer’s works to the site.

v. Receipt, storage, preservation and conservation of equipment at the site.

vi. Pre-assembly, if any, erection testing and commissioning of all the equipment.

vii. Reliability tests and performance and guarantee tests on completion of commissioning.

viii. Loading, unloading and transportation as required.

ix. Laying of 11kV, XLPE UG cable by Horizontal Directional Drilling method .

x. Formation of additional one 11 kV outdoor bay and installation of outdoor 11kV Porcelain

clad switch gear for new 11kV feeder at Sishubhawan sub station.

xi. Erection of 11 kV Lightning Arrestors.

xii. Erection of 11 kV AB switch Unit.

xiii. Installation of 11KV metering unit at the proposed 6 pole structure of Ayakar Bhawan.

xiv. Jointing of 400mm2, 11KV, XLPE cable:- straight through and end termination.

xv. Testing, Commissioning of 11kV, HT, UG cables, 11kV Switch gear ,AB switches,

Lightning arrestors etc

xvi. Storing before erection



xvii. Getting the complete 11kV network system inspected by Electrical Inspector after

completion of work.

xviii. Cable route marking by standard methodology.

xix. Cable looping at the either sides of the cable.

5.0. Technical specifications for supply of materials:

The supply of all the required materials for this TOTAL TURN KEY project is in the scope of the

contractor. The technical specifications for the major materials required are dealt herewith in the

following sections of this volume. The following is the list of the Technical specifications for

materials/equipments

1. 11kV Class HT 3core UG cables, XLPE insulated, 400 mm², Aluminium

2. 11kV class XLPE insulated straight through jointing Kits and end Terminations for HT

UG Cables of 400mm² size.

3. 11 kV class Lightning arrestor.

4. 11kV class 11 kV AB switch.

5. 11KV metering unit at the proposed 6 pole structure

6. 11kV class Porcelain clad circuit Breakers for 33/11kV substation.

7. Laying of HT UG Cables.



Section-II

Porcelain clad 11kV Switch Gear



TECHNICAL SPECIFICATION OF 11KV CLASS PORCELAIN CLAD SWITCHGEAR

1.0 SCOPE:

The scope of this specification is for design, manufacture, testing, and supply of outdoor 11 KV

class porcelain clad switchgear suitable for installation for use in a 3-phase 50Hz, 11KV solidly

earthed system. The switchgear assembly shall consist of complete with all components such as

circuit breakers, control gear, instrument transformers, meters, relays, switches, indicating lamps,

test blocks, current transformers, voltage transformers etc. which are required in each panel for

satisfactory and efficient performance of the switchgear. The switchgear shall suit outdoor

installation.

2.0 APPLICABLE STANDARDS :

The switchgear shall confirm to the following standards namely BIS – Bureau of Indian

Standards and IEC – International Electro Technical Commission.

Sl No IS / IEC Nos Equipments & components.

1 IS 5 Paints, Finishing Exterior

2 IS 513 Cold rolled low carbon steel sheets and strips.

3 IS 641 Paints, Finishing interior White

4 IS 722 A.C. Electricity meters

5 IS 722 Parts(1)to(5) (7)to(9)

Direct acting indicating analogue electrical measuring Instruments

and their accessories.

6 IS 1730 Steel sheet and strip dimensions

7 IS 1951 PVC sleeving for electrical purpose.

8 IS 2419 Dimensions for panel mounted indicating instruments.

and electrical recording

9 IS 2516

/13118 Specification for alternating current Breakers

10 IS 2750

Parts I to IV Current Transformers

11 IS 2959 AC & DC Contractors

12 IS 3156

parts I to III Voltage Transformers

13 IS 3231 Electrical relays for power system protection

14 IS 3427 Metal enclosed switchgear and control gear

for voltages above 1000 V but not exceeding 11000 V



3.0 NORMAL SERVICE CONDITIONS :

Generally as per (1) clause 2.1(a) to 9(e) of Is 13118 Clause – 2.

DEFINITIONS AND TERMINOLOGY :

As per

15 IS 3842

Parts I to XII

Application guide for Electrical relays for

protection and other relays.

16 IS 4146 Application guide for voltage Transformers

17 IS 4201 Application guide for current transformers

18 IS 477 Performance tests for protective schemes used in

protective of light gauge steel against corrosion

19 IS 4794

parts I to II Push button switches

20 IS 5608

Parts I to IV PVC wires and sheaths

21 IS 6236 Direct recording electrical measuring instruments

22 IS 6875 Control Switches

23 IS 7118 Recommendation for direction movement for

control device, operating electrical devices.

24 IS 8130 Conductors for insulated Electric cables.

25 IS 8197 Terminal markings of electrical measuring

instruments and accessories.

26 IS 8686 Static protective relays.

27 IS 9224

Parts I to II

Pictorial surface preparation standards for

painting of steel surfaces.

28 IS 9954 Code of practice for installation of switchgear

29 IS 10118 Code of practice for installation of switchgear

30 IS 10276 Edison screw lamp holders

31 IS 11431 Code of practice for packaging of electrical

I Indicating and recording instruments

32 IEC 56 High voltage alternating current circuit breakers1987

33 IEC 694 Common clauses for high voltage switchgear and

control gear standards.

34 IEC 687 Static watt-hour meters for class 0.25 and 0.5

35 IS 14697 Static transformer operated watt-hour and

VAR hour meters class 0.25 and 0.5



Ref Nos Ref Clauses

i IS-3427 Clause- 2 and sub clauses there of for switch gear.

ii IEC-56 Clause - 3 and sub clauses there of for circuit breakers

iii IS-13118 Clause - 3 and sub clauses there of for circuit breakers

iv IS-2705 Part- I to IV clause-2 &sub clauses there of for current transformers.

v IS -3516 Part -I clause-2 &sub clauses there of for voltage transformers

4.0 DESIGN AND CONSTRUCTION:

4.1 GENERAL.

4.1.1 The Circuit breaker shall be provided with vacuum interrupters hermetically Sealed. The

vacuum bottles are to be mounted in side porcelain enclosure and Placed on a sheet metal

enclosure having main operating links. The mechanism is to be placed under this and

connected by a link, which transmits mechanical power to circuit breaker. The entire assembly

shall be mounted on an elevated structure to provide live point clearance as per IS 10118.

4.1.2 Control and relays shall be mounted in out door sheet steel KIOSK. The minimum thickness of

the galvanized steel sheet shall not be less than 3.5 mm for the base and load bearing

members and not less than 3.0 mm for the top cover, side sheets, doors and partitions.

Galvanized Sheet steel shall be cold rolled confirming to IS –513. The panel door shall be

provided with louvers and with translucent plastic covered windows directly opposite to the

close/open indicating lamps and spring status indicator. The panel door shall be hinged, swing

door provided with pad locking facility. Rear door shall also be hinged on one side and bolted

on the other side.

4.1.3 The design and construction shall be with the following features:

a) Compact and robust construction.

b) Dust protected and vermin proof

c) Safe and positive interlocks.

d) Easy interchangeability of identically rated components including breakers.

e) Extremely reliable operation.

f) All relays, instruments, and switches mounted on the instruments panel shall be

accommodated at a height in between 0.5 to 2.0 meters from ground level in the

outdoor control panel.

4.1.4 Auxiliary devices and circuits :

Generally as per clause 3.2.7 of IS 3427.



4.2 INTERLOCKS : Generally as per clause 3.4(e) with mechanical interlocks of IS 3427.

4.3 EARTHING :

Generally as per 3.5 of IS 3427. However the earthing conductor shall be of copper flat shall

not be less than 25 X 6 mm. Earthing shall be suitable to receive 50 X 6 mm GI flat of station

earthing in the 2 bolts of M.12 size.

4.4 SWITCHGEAR COMPONENTS:

The following shall be components in the PC, VCBs.

� Vacuum interrupters mounted in porcelain enclosures

� Current transformer

� Instruments and protective relays selector switches

� Interconnections between breaker and instrument transformers

� Terminal connectors to receive ACSR Lynx conductor

� Control switches, indicating lamps, contactors and test terminal blocks

� Voltage transformer.

� Control cabling from instrument transformers secondary box to control and relay kiosk with

cable glands.

4.5 GENERAL ARRANGEMENT OF COMPONENTS: 4.6 Various switchgear components are to be arranged.

4.7 The interconnections are in scope of supply of the tenderer.

4.8 The following shall be provided in each panel as applicable a) Cubicle space heater with thermostat

b) View glass for breaker position indication

c) Names plates

d) Danger board

e) Operation counter for the breaker

f) Spring charging handle

5.0 GENERAL ARRANGEMENT OF THE SWITCHGEAR PANELS:

4.1 The kiosk where control equipments are housed shall be provided with a lean to drain water to

the rear of the panel. The proof shall be projecting on all sides so that rain water shall not

enter into the body of the panels.

4.2 The central annunciator panel shall be suitable for mounting indoor. Remote close / Trip

facility shall be provided on this panel itself for remote closing /opening of individual breakers.

6.0 SWITCHGEAR RATINGS:

6.1 CHARACTERISTICS :



� Rated voltage as per clauses 4.2 if IS 3427 for nominal system voltage of 11 KV

� Rated insulation level 28KV / 75KV peak – for 11KV nominal system voltage.

� Rated frequency – 50Hz

� Rated normal current – 1250A for incomer /800A for feeder.

� Rated short – time current – 20 KA

� Rated Peak short – time current,. As per clause 4.7 of IS – 3427 and in conjunction

with sub-clauses (e) supra.

� Degrees of protection. Corresponding to IP 55 of Is-12063.

� The temperature rise limits for the various materials shall be as per table – V of IEC

694.

7.0 SWITCHGEAR COMPONENTS:

Rated values of the components forming part of the meal enclosed switchgear and control

gears are detailed here below individually against each component.

7.1 Circuit breakers :

a) Type : vacuum

b) Rated voltage 11KV rms.

c) Highest system voltage 12KV rms.

d) Frequency 50Hz

e) Number of poles – three

f) Class outdoor.

g) Power frequency withstand voltage: 258KV rms.

h) Impulse with stand voltage- 75KVP

i) Rated normal current –630 A.

j) Rated symmetrical breaking current- 25KA

k) Rated transient recovery voltage: as per clauses 4.102.2,4.102.3 of

IEC 56, table – II A for 12KV rated voltage.

l) Rated making current peak : 50 KVA

m) Short time withstand current – 25KA for 3 seconds.

n) Operating sequence : As per clause 4.104 (a) of IEC – 56 0-3min-co

o) Rated supply voltage of opening /closing devices with operating

limits.

6.1.1 Closing coil- 110V.DC – to operate satisfactorily between 85 to 110 % of rated voltage.

ii) Opening coil (shunt trip coil) – 110V DC to operate satisfactorily between 70 to 100% of rated Voltage

p) Rated voltage of auxiliary supplies.



i) Space heater -AC 230V, S.Ph 50 Hz.

ii) Spring charging motor – AC 230V, S.Ph 50 Hz.

iii) Cubical illumination – AC 230V, S.Ph. 50 Hz.

q) Method of closing and opening – The breaker shall be capable of discharging the energy

stored in spring. These springs should be capable of being compressed or charged by an

AC motor. It should be possible to charge the springs manually by means of a spring

charging handle or lever. During manual charging of the springs an electromechanical

device shall be provided to prevent charging of the same by the motor. The springs should

also be capable of being charged even with the breaker in the closed position so as to

restore tension in the springs. Besides, there should be provision to automatically cut – off

power supply to the motor when the springs are fully charged and also to automatically

switch – on the power supply to the motor when the springs are fully discharged. There

shall also be provision to indicate springs status namely “FREE” / “Charged “ by means of

a mechanical lever at the panel. This shall be arranged through potential free auxiliary

contacts or limit switches. The mechanism shall be provided with an anti pumping device

to prevent closing impulses from being transmitted, to the closing coil when the breaker is

in the closed position.

r) Auxiliary Contacts : 8 No+8NC conforming to clause 5.4 of IEC 694.

s) Name Plates …. As per clause 5.9 of IEC 56. t) Requirements for simultaneity of poles – As per Clause 5.101 of IEC 56.

7.2 CURRENT TRANSFORMERS

7.2.1 The current transformers shall conform in all respects to IS – 2705 parts I to IV.The

arrangement of current transformers in porcelain clad switch gear is shown in sketch 1&2.

7.2.2 CTs shall be encapsulated resin cast or poly crate to suit outdoor instalation.

7.2.3 CT ratio changing is preferred on Secondary side.

7.2.4 Rating characteristics:

a. Nominal voltage : 11kV rms.

b. Highest system voltage : 12kV rms

c. Frequency : 50 Hz.

d. Power frequency withstand Voltage : 28kV rms

e. Impulse with stand voltage : 75kVp

f. Ratio and Cores : 3 cores 20-10/1-1-1A



g. Accuracy class- burden

Core 1 (metering ) : 0.5/15VA

Core 2 (OCR,EFR &

REFR Protection) : 5 P20/15VA

Core 3 (differential

Protection) : PS/VK Min 300V

h. Instrument security factor : 5 at all ratios

i. Earthing : As per clause 4.3

of IS 2705 (part-1)

j. Short time current Rating

i. Thermal rating : 25 KA for 1 second

ii. Dynamic rating : As per clause 562 of IS2705 part-I

k. Terminal Marking : As per Clause 6.2 of IS 2705 part-I

l. Rating Plate : As per Clause 6.1 & 7.1 of 2705

7.3 METERING INSTRUMENTS:

7.3.1 Meters to be mounted shall conform with IS 1248 Parts (I to IX) and dimension shall conform

to IS-2419.

7.3.2 All meters shall be CT/VT Secondary operated instruments and shall be flush mounted with only the bezels projection.

7.3.3 All meters shall be wired at the back and shall be provided with tropicalised dials, to ensure freedom from warping, iscoloration or fading.

7.3.4 The lettering/Numbering on dials shall be in bold black on white dial background.

7.3.5 All meters shall be magnetically shielded.

7.3.6 All indicating analog meters shall be provided with a screw type zero adjuster for the needle with facility to operate from the front of the panel without having to remove the cover of the meter.

7.3.7 All meters shall be wired through test terminal blocks to facilitate independent calibration of meters.

7.3.8 TYPE RATING AND CHARACTERISTICS: A) AMMETER:

i) One No. to be provided. The ammeter shall be provided with a selector switch to read the current in each of the phases.

ii ) Moving Iron. iii) Size – 96*96 mm

Iv) Accuracy…….1.0

V) Scale 0 – 5 – 10 - 20



B) Watt meter:

I. One number to be provided in each panel. II. Type: 3 phase3 wire two element dynamometer. III. Size 96 X 96 mm. IV. Accuracy class: 1.5. V. Range: 0-200 KWS

VI. Scale : 90 degrees and end suppressed

C) VAR Meter:

I. One number to be provided in each panel.

II. Type: 3 phase 3 wire two element dynamometer.

III. Size 96 X 96 mm.

IV. Accuracy class: 1.5.

V. Range: 0-200 KVAR

VI. Scale: 90 degrees and end suppressed

D) Electronic Tri vector Meter:

I. One number to be provided

II. It shall be static type 3 phase, 3 wire, 2 element, suitable for 1

amp CT & 110 volts phase to phase V.T secondaries. It must be

flush mounted type & tropicalised. It shall have separate registers

for recording kWHr & kVAHr consumption seperately, maximum

demand (with resetting facility), both for import and export modes.

III. The accuracy class shall be 0.5.

IV.The meter shall have legible LED/ LCD minimum 6 digit auto

cycle display and non volatile memory with out battery back up.

V.The meter shall have galvanically isolated optical.

VI.The meter shall be capable of storing the complete half hourly

data required for load analysis & energy audit for a period of 35

days

VII.communication port for down loading the data to an MRI or to

DCD or to a modem.

VIII.The meter shall have self diagnostic feature to check its circuits

for any malfunctioning.

7.4 Protective Relays:

The relays to be mounted in front of the panel Electornic draw out type, suitable for 3ph,

one amp CT secondary current , 110 volts ph to ph VT secondary, and 110 volts D.C.

auxiliary.



The following relays are to be provided.

a) Electronic Relay: Combined unit for OCR & EFR for line side.

7.5 Control switches: 7.5.1 General :

The control switch shall contain two electrically independent double break contacts and shall

be moulded in a self – extinguishing plastic compound with inherent arc – quenching and high

insulating property enclosed moulding giving a high degree of dust protection. The back of

control switch is to be shrouded in transparent cover, automatic spring return to neutral switch

type to be provided. The switches shall be suitable for 20 Amps continuous rating and 110V

DC.

7.5.2 Requirement : a. One No. in each outgoing panel.

b. One No. for each outgoing breaker in the annunciator panel for remote operation.

7.6 SELECTOR SWITCHES (FOR AMMETER AND VOLTMETERS)

7.6.1 General : These shall be slow – break, quick-make, rotary type, stay put switches, and shall be suitable

for flush mounting. These switches shall be suitable for being operated by flush mounting.

These switches shall be suitable for being operated by a knob from the front face of the panel.

They shall be suitable for 10 Amps continuous rating and 415V AC. The ammeter selector

switches shall short – circuit the CT secondary before it is broken and remove the short circuit

after the ammeter is inserted in the circuit. All the switches shall have position indication plates

4 ways i.e., R, Y, B and OFF.

7.7 Indication lamps:

7.7.1 Indication lamps shall be integral LED module type 0.5 watts, suitable for 110 volts D.C.and

these shall be integral self contained LED indicator units which can be directly mounted in the

panel. The rated input voltage can be directly applied to the module input as all the controlling

circuitary is built is built in to the module body it self. These modules shallbe suitable for panel

cut outs of size 22.5mm dia with the use of crome plated standard mounting adopter / bezel

sets and colours RED, GREEN,ABMER/YELLOW, WHITE, & BLUE. The axial light intensity

should be min 40 milli candella.

7.7.2 COLOUR CODE FOR LAMPS:

� Breaker open : Green

� Breaker Closed : Red

� Auto trip : Amber

� Spring charged : Violet / Blue

� Trip Circuit Healthy : White



7.7.3 REQUIREMENT OF LAMPS

a) One set of green, amber and red lamps in each incomer and outgoing panels along with

spring status violet / Blue and trip circuit healthy white on command.

b) One set of green, red, amber, violet / blue and white lamps for indicating the status of each

incomer and outgoing breakers in the remote indoor annunciation panel

7.7.4 10% of the total of integral LED module type lamps for each panel shall be supplied as spare

without extra cost.

7.8 FUSES:

6.8.1 GENERAL:

All fuses shall be moulded bakelite complete with fuse bases, fuse carriage and HRC cartridge

fuses. All fuse fittings should be labeled by etching on an anodized plate with details of the

fuse rating and the circuit for which the fuse is provided.

6.8.2 RATING:

i. AC 115V for all supply fuses. ii. DC 110V for DC circuits

1.8.3 Rated Current : AS per clause 5.3 of IS 9224 (Part-I) 1979 (Preferred value of rated current 32

Amps)

6.8.4 REQUIREMENTS:

All AC and DC circuits shall be provided with suitable fuses and fuse links for each phase /

pole.

6.8.5 10% of the H.R.C fuse cartridge shall be supplied as spares without Extra cost.

7.9 WIRING:

7.9.1 GENERAL:

The wiring shall be done by using PVC-insulated 660 V annealed, stranded Copper

wire. The wires shall run straight and shall be given right angle bends wherever necessary so

as to give a pleasing appearance. The size of wiring in difference circuits shall not be less

than the sizes specified below:

a) Metering and Relay circuits : 2.5 Sq.mm connection from CT’s and VT’s

b) All terminal connections to the equipments and terminal blocks shall be

done by using Tin coated Copper lugs. All the outgoing wiring from the

panel shall be terminated on the terminal block mountd in the front of the

panel with suitable provision for connection to the interconnecting control

cable. The wiring shall conform to IS 375 with latest amendments if any.



c) All wiring shall be provided with alphanumeric ferules at either ends as

per the wiring schedule.

d) All terminals shall be nut & stub type of brass coated with Nickle of size

M6.

7.10 TEST TERMINAL BLOCKS:

The Test terminal blocks required are for testing while in service and shall be of the 3 phase 4

wire, front adjustable, link type, projected, mounted with screwed cover and wired at the rear,

rated for 10 Amps, The wiring shall be so as to short circuit the CT phase to the star point and

it shall be possible to calibrate through external injection.

7.11 Galvanising

7.11.1 All the steel frame work and surface of the steel panels shall be fully galvanized to with stand

saline weather in the coastal areas.

7.11.2 Block No. shall be assigned for each compartment and the same shall be stencilized in white

paint on the inside of panel.

7.12 TERMINAL PAD / CONNECTORS: The Terminal Connectors for CTs and porcelain clad breakers shall suit to receive ACSR Lynx

of 10 mm dia minimum 4 bolt connection.

7.13 FOUNDATION BOLTS: Foundation bolts with 10% spares are in the scope of supply of the supplier.

7.14 AUXILARY DC SUPPLY : The auxiliary 110 V D.C. supply will be arranged from station battery panel.

7.15 AUXILIARY AC SUPPLY: The auxiliary A.C. supply at 3phase 415 volts will be arranged from the Biomass generating

unit 1 & 2

7.16 INDOOR TYPE COMBINED REMOTE CONTROL & ANNUNCIATOR PANEL.

7.16.1 General: Sloping desk type / free standing panel, with audio visual annunciator facia windows on the

inclined slope along with annunciator lamp test, accept and reset push buttons. All control

switches in the run of the mimic bus with indicating lamps mounted on the horizontal desk.

The base of the desk shall be provided with vermin – proof sheet metal cover and cable

gland, to receive the control cables from the outdoor panels. The annunciator shall be

electromechanical.



7.16.2 Wiring: All wiring from the outdoor panel shall be terminated on the terminal blocks inside the

cubicle. The terminal block shall be Brass stud and nut type of size M6. The terminal blocks

shall be of moulded resin type provided with plastic shrouds. Sufficient spare terminals shall

be provided on the terminal blocks. Paint shade of annunciator panel shall be opaline green

of shade No. 275 of IS – 5

7.16.3 Annunication facia windows shall be with plastic facia sheet engraved with letters of 5 mm

size. The inscriptions shall be visible only when the facia is lighted. The lamps shall be

suitable for 110 V DC with an in – built resistor. The initiation of annunciation shall be

through NO-NC contracts of the relay.

A hooter suitable for 110V DC shall be installed in the annunciator panel for alarms

7.16.4 REQUIREMENT OF ENGRAVING IN THE ANNUNICIATOR DESK:

i. No. of Windows 5

OCR R Phase operated 1 >

OCR B phase operated 1 > Trip alarm

EFR operated 1 >

Deferential relay operated 1

DC fuse failure 1 > Non Trip

No. of windows spare 1

Master trip relays 1

ii. Breaker open indication lamp 1

iii. Breaker close indication lamp 1

iv. Spring free/charged indication lamp 2

v. Breaker auto trip 1

vi. Trip/Neutral/Close switch 1

8.0 TESTS:

8.1 TESTS ON SWITCH GEAR:

8.1.1 Type tests:

As per clause 8.1.1 – (a) to (e) and (h) and (j) of IS 3427 – 1969.



8.1.2 Routine Tests:

As per clause 8.12 – (1), (b) & (e) of IS – 3427 – 1969.

9.1 TESTS ON CIRCUIT BREAKERS:

9.1.1 TYPE TESTS:

As per clause 6.0 of IS 13118.

9.1.2 ROUTINE TEST:

As per clause 7.0 of IS 13118.

9.2 TEST ON CURRENT TRANSFORMERS :

9.2.1 TYPE TEST :

a) As per clause 7.1.1(a) to (h) of IS 2705 (Part-I)-1981.

e) As per clause 8.1 of IS 2705 (Part-II)- 1981.

f) As per clause 8.2 of IS 2705(Part-III)-1981.

g) As per clause 8.3 of IS 2705(Part-III)-1981.

h) As per clause 6 of IS 2705(Part-iv).

9.3 TEST ON VOLTAGE TRANSFORMERS :

9.3.1 TYPE TESTS:

i) As per clause 6.1.1 of IS 3156(part-1)-1978.

a. As per clause 8.1 of IS 3156(part-II), 1978.

b. As per clause 9.1 of IS 3156(part-III)-1978.

9.3.2 ROUTINE TESTS:

i) As per clause 8.1.2 of IS 3156(part-I)-1978.

ii) As per clause 8.2 of IS 3156(part-II- 1978. As perclause 9.2 of IS 3156(part-III)-1978.

9.4 TESTS ON RELAYS:

9.4.1 Type tests and routine tests as per IS 3231 and IEC 255 shall be conducted.

9.4.2 TYPE TESTS:

Type test reports not older than 5 years on the date of bid opening, pertaining to all type tests

stipulated in IS 3231 and other tests conducted shall be furnished along with the bid

document.

9.4.3 All routine tests shall be carried out in the presence of the owner’s representative for which

sufficient advance intimation shall be given.

9.5 All instruments, relay, and other components shall be provided with name plates at their rear

and shall be supplied separately as dissembled components.

10.0 INDOOR COMBINED ANNOUNCIATOR AND REMOTE CONTROL PANEL:

a) Control Switch.---- one number for each breaker.



b) Indicating lamps.--- one set of the following for each breaker.

I. Green.

II. Red.

III. Amber.

IV. Violet. /Blue.

V. White

c) Fuse.------------------- one No.

d) Bell.-------------------- one No.

e) Hooter .---------------- one No.

f) Electromechanical announciator relay.

g) Push button

i. Accept,--- one No.

ii Reset.---- one No.

iii Lamp test.-- one No.

iv Hooter test.--- one No



Section-III

11kV UG Cable



TECHNICAL SPECIFICATIONS FOR 11KV, XLPE INSULATED UG CABLE

1.0 SCOPE :

1.1 The scope of this specification covers the design, manufacture, stage inspection at works,

inspection and testing the finished cables 6.35 /11KV aluminum conductor. Three Core,

400 mm², XLPE insulated screened, underground cables at manufacturer’s works.

2.0 RATED VOLTAGE

2.1 The rated voltage of the cable shall be 11000 Volts AC with the highest system voltage of

12000 Volts between phases of the effectively earthed three phase-distribution system.

3.0 APPLICABLE STANDARDS:

3.1 Unless otherwise stipulated in the specifications, the latest version of the following

Standards shall be applicable.

a. IS 8130 – Conductors for Insulated electrical cables and flexible cords

b. IS 10810 (series) – Methods of tests for cables

c. IS 10418 – Drums for electrical cables.

d. IS 7098 (Part 2) – Cross – linked Polyethylene Insulation for Cables.

e. IS 3975 – Specification for mild steel wires, strips and tapes for armoring of

cables.

f. IS 5831 – Specification for PVC insulation sheath for electric cables.

Dimensions of protective coverings of cables

Part 1 – Elastomeric and thermoplastic insulated cables.

3.2 The Cables manufactured to any other Internal Standards like BSS, IEC or equivalent

standards not less stringent than Indian Standards are also acceptable. In such cases, the

Bidders shall enclose a copy of the equivalent international standard, in English language,

along with the bid.

4.0 CONSTRUCTION:

4.1 Conductor :- The conductor shall be composed of compacted circular aluminum

wires complying with IS 8130.

4.2 Insulation : - The insulation shall be cross linked polyethylene conforming to the following

requirements.

Sl.NO. Properties Requirements

1. Tensile Strength 12.5N/mm2, Min.

2. Elongation to break 200 percent, Min

3. Aging in air oven :

Treatment : Temperature

Duration

135+_3

0 C

7 Days

Tensile Strength variation : + 25 percent, Max

Elongation variation: + 25 percent, Max

4. Hot set :

a) Treatment : Temperature:

Time under load

Mechanical stress

200 + 30 C

15 min

20N/cm2



b) Elongation under load 175 percent, Max

c) Permanent elongation (set) after cooling 15 percent, Max

5. Shrinkage:

a) Treatment : Temperature

Duration

130+ 30 C

1 hour

b) Shrinkage 4 percent, Max

6. Water absorption (Gavin metric) :

a) Treatment : Temperature

Duration

85+ 20 C

14 days

b) Water absorbed 1 mg / cm2, Max

7. Volume Resistivity

a) at 270 C

b) at 700 C

1 x 1014 ohm-cm, Min

1 x 1013 ohm-cm, Min

4.3 The screening shall consist of non-metallic semi conducting compound and copper tape,

shielded cores laid up with fillers, inner sheath of extruded PVC, Galvanized steel strip

Amour and PVC ST-2 overall sheath.

4.4 The cables should be suitable for use in solidly earthed system.

4.5 The 6.35/11KV underground cables shall be manufactured to the highest quality, best

workmanship with scientific material management and quality control. The bidder shall

furnish the quality plan, giving in detail the quality control procedure / management system.

4.6 The successful Bidder shall give sufficient advance notice to the purchaser of not less

than fifteen days to arrange for stage inspection and inspection of quality assurance

program during manufacture, at the works.

5.0 SYSTEM DETAILS

General Technical particulars

General Technical particulars

Sl No Particulars Values

1 Nominal system voltage (rms) (U) 11KV

2 Highest system voltage (rms) (Um) 12KV

3 Phase to Earth voltage (rms) (U0) 6.35 KV

4 Number of Phase 3

5 Frequency 50Hz

6 Variation in Frequency + / - 3%

7 Type of Earthing Solidly Earthed

8 Basic impulse insulation level (1.2/50 µS wave) 75 KV

9 Total relay & circuit breaker Operating time 15-20 cycles

10 One Minutes power frequency withstand voltage 28 KV rms



6.0 INSTALLATION CONDITIONS :

6.1 The cables are laid directly buried in ground, in the bores formed by horizontal boring

method. The Nominal depth of laying is up to 2000 mm (from top, of ground to centre of

cable).However, in trenchless horizontal bore method, the bore can go upto a depth of a

maximum of 2 meter. Nature of soil is heterogeneous, sandy, Soil resistivity varies between

18 to 100 ohmmeter and the Thermal resistivity is around 1200 to 1500 C/ Cm/w.

7.0 CLIMATIC CONDITIONS :

7.1 The climatic conditions where these 11KV cables will be installed are as under :

Climatic conditions

Sl No Particulars Details

1 Location: Cuttack, Orissa

2 Altitude As is coastal area, altitude will Not exceed

100 M above MSL.

3 Max Daily average air temp : 45 0 C

4 Minimum ambient air temp : 10 0 C

5 Ground temperature at

depth of laying assumed :

350 (Max) 50 C (Min)

6 Isoceraunic level 45

7 Avg. annual rainfall : 2500 mm

8 Avg. number of rainy days

per annum:

90

9 Climate: Tropical moderately hot and humid.

likelihood of subsoil water at certain location

at the depth of burial of cables..

10 Soil : Normally wet

8.0 DESIGN CRITERIA :

8.1 The cables that are covered in these specifications are intended for use in the Coastal belt

of state of Orissa for Power distribution purposes, under the climatic conditions and

installation conditions described in the technical specification.

8.2 Any technical features, not specifically mentioned here, but is necessary, for the good

performance of the product, shall be incorporated in the design. Such features shall be

clearly brought out under Technical deviations schedules only, in the offer made by the

bidder, giving technical reasons, and justifying the need to incorporate these features.’

8.3 For continuous operation of the cables, at specified rating, the maximum conductor temperature shall be limited to the permissible value as per the relevant standard, generally not exceeding 90°C under normal operation and 250°C under short-circuit conditions.

8.4 The cables in service will be subject to daily load cycles, of two peaks during a day; morning peak and evening peak, with around 50% loading during the nights.

8.5 The materials used for outer sheaths shall be resistant to oils, acids and alkalis. 8.6 The cables shall have the mechanical strength required, during handling and laying. 8.7 The cables shall be designed to withstand the thermo-mechanical forces and electrical

stresses during normal operation and transient conditions. 8.8 The cables shall be designed to have a minimum useful life span of Thirty years.



9.0 MANUFACTURE PROCESS:

9.1 Cross-linking of the insulation materials (pre compounded polyethylene) shall be conforming to IS :7098 (Part-II)

9.2 The conductor screen shall be extruded semi conducting compound. The insulation screen shall consist of the nonmetallic part, extrude semi conducting compound with non-magnetic metallic part. The XLPE insulation and the shield for conductor and insulation shall be extruded in one operation.

10.0 MATERIALS

10.1 Conductor: - The conductor shall be of standard construction. The material for

conductor shall consist of the plain aluminum of H2 or H4 grade as per clause – 3 of IS

8130 / 1984.

10.2 The Number of wires in the conductor, shall be not less than the appropriate minimum

number given in table – 2 of IS 8130 / 1984.

11.0 SCREENING :

11.1 The conductor screening shall be provided over the conductor by applying non-metallic

semi-conducting compound. The metallic screen shall withstand the operating temperature

of the cable and shall be compatible with the insulating material.

11.2 The insulation screen shall be applied over the insulation. The insulation screening

shall consist of two parts; namely metallic and non-metallic. The non-metallic part shall be

applied directly over the insulation of each core and shall consist of a semi conducting tape

and extruded semi conducting compound with a semi conducting coating. The metallic

part of the insulation screen shall consist of either tape, or braid, or concentric serving of

wires or a sheath; shall be non-magnetic and shall be applied over the non-metallic part.

12.0 CORE IDENTIFICATION:

12.1 The core identification for 3 core cables shall be provided, by suitable means, like, by application of colored stripes, or by numerals or by printing on the cores as per clause 13 of IS : 7098 – Part 2.

12.2 For identification of different coloring of XLPE insulation, or by using colored strips, red, yellow and blue colors respectively shall be used to identify the phase conductors.

13.0 LAYING UP OF CORES:

13.1 For multicore cables, the cores shall be laid together with a suitable right hand lay. The interstices at the center shall be filled with a non-hygroscopic material.

14.0 INNER SHEATH (COMMON COVERING)

14.1 The laid up cores shall be provided with inner sheath applied either by extrusion or bv

wrapping. It shall be ensured that the shape is as circular as possible. The inner sheath shall be so applied that it fits closely on the laid up cores and it shall be possible to remove it without damage to the insulation.

14.2 The thickness of the inner sheath (common covering) shall be given as follows:

Calculated diameter over laid up cores in accordance With 15.3 of IS 10462 (Part 1) – (mm)

Thickness of inner sheath (mm)

Over Up to and including - 25 0.3

25 35 0.4



35 45 0.5

45 55 0.6

55 - 0.7

When one or more layers of binder tapes are applied over the laid up cores, the thickness

of such tapes shall not be construed as a part of inner sheath.

14.3 For multi core cables, the interstices at the center shall be filled with a non-hygroscopic

material. The interstices around the laid up cores shall be covered with PVC compound

type ST-2. This will form the Inner sheath for multi core-single core cables.

15.0 ARMOURING:

15.1 Armoring shall be applied over the inner sheath as closely as practicable. The Amour

shall be galvanized steel strip complying with the requirements of IS 3975. A binder tape

may be applied on the Amour. The direction of the lay of the amour shall be left hand. For

double armored cables, this requirement applies to the inner layer. The outer layer shall be

applied in the reverse direction to the inner layer, and there should be a separator of the

non hygroscopic material; such as plastic tape, bituminized cotton tape, rubber tape,

proofed tape between inner and outer layers of Amour.

15.2 The dimensions of galvanized steel strips shall be as below:

Calculated diameter over Amour [IS 10462 Part 1] (mm)

Nominal thickness of Steel Strip(mm)

Over Upto and including - 13 -

13 25 0.8

25 40 0.8

40 55 1.4

55 70 1.4

70 - 1.4

15.3 The joints in the strips shall be made by brazing or welding and the surface

irregularities removed. A joint in the strips shall not be less than 300 mm away from the

nearest joint in any other strip in the completed cable.

15.4 Bidders shall furnish the calculation / data sheet for the short circuit carrying capability

of the Armour.

16.0 OUTER SHEATH : 16.1 The outer sheath over the Armoring shall consist of poly vinyl chloride (PVC)

compound, conforming to the requirements of type ST-2 of IS 5831. Suitable additives

shall be added to give anti termite protection.

16.2 The minimum thickness of the PVC outer sheath shall not fall below the following value

by more than 0.2 mm + 0.2 ts

Calculated diameter under the outer sheath [IS 10462 Part 1] - mm

Nominal thickness of the Outer

sheath (ts) - mm

Over Upto and including - 15 1.8

15 25 2



25 35 2.2

35 40 2,4

40 45 2.6

45 50 2.8

50 55 3

55 60 3.2

60 65 3.4

65 70 3.6

70 75 3.8

75 - 4

17.0 IDENTIFICATION :

17.1 The outer sheath shall have the following information embossed or indented on it; the

manufacturer’s name or trade mark, the voltage grade, the year of manufacture and the

letters “CESU”. The identification shall repeat every 300/350-mm along the length of the

cable.

17.2 Note: The outer sheath of the cable should be embossed with“CESU”.

18.0 INSPECTION AND QUALITY CONTROL :

18.1 The Bidder shall furnish a complete and detailed quality plan for the manufacturing

process of the cable. All raw materials shall conform to relevant applicable standards and

tested for compliance to quality and requirement. During the manufacturing process, at all

stages, inspections shall be made to check the physical and dimensional parameters, for

verification to compliance to the standards. The bidder shall arrange, for inspection by the

purchaser, during manufacture, if so desired by the purchaser, to verify the quality control

process of the Bidder.

19.0 TYPE TESTS :

19.1 The offered cables with same designs shall have been type tested and Test

certificates shall not be later than 5 years on the date of bid opening. Otherwise the

supplier / Turnkey contractor shall arrange for type testing at his own cost.. The

supplier /Turn Key contractor shall conduct all type tests as per IS : 7098 part-II

1985, with up to date amendments or equivalent International standard, and supplies

made only after approval of test reports from the purchaser.

19.2 All type tests if required, routine; acceptance test shall be conducted in the presence of

the purchaser / representative.

19.3 The supplier shall give 15 days advance notice for inspections, and witnessing of tests

by the purchaser or his representative.

19.4 The following type tests will be conducted on the cable if the type test

certificates are more than 5 years old

(a) Test on conductor.

(b) Test on Amour.

(c) Test for thickness of XLPE insulation and inner and outer sheaths

(d) Physical test on XLPE insulation.



(e) Physical test for outer sheath

(f) Bleeding and blooming test for outer sheath

(g) Partial discharge test.

(h) Bending test

(i) Di-electric power factor test

i. As a function of voltage

As a function of temperature

(j) Insulation resistance (volume resistivity) test

(k) Heating cycle test

(l) Impulse withstand test

(m) High voltage test

(n) Flammability test

19.5 The following test shall be performed successfully on the same test sample of

completed cable, not less than 10 M in length between the test accessories:

I. Partial discharge test

II. Bending test followed by partial discharge test

III. Dielectric power factor as a function of voltage.

IV. Dielectric power factor as a function of temperature

V. Heating cycle test, followed by dielectric power factor as a function of voltage and

partial discharge tests.

VI. Impulse withstand test

VII. High voltage test.

20.0 ACCEPTANCE TEST:

20.1 The sampling plan for acceptance test shall be as per IS 7098 part-II, Appendix ‘A’

20.2 The following shall constitute the acceptance test.

a) Tensile test for aluminum

b) Wrapping test for aluminum

c) Conductor resistance test

d) Test for thickness of insulation

e) Test for thickness of inner and other sheath

f) Hot-set test for insulation

g) Tensile strength and elongation at break test for insulation and outer sheath.

h) Partial discharge test (on full drum length).

i) High voltage test.

j) Insulation resistance (volume resistivity test).

21.0 ROUTINE TEST :

21.1 The following shall constitute routine tests :

a) The following shall constitute routine tests:

b) Conductor resistance test

c) Partial discharge test on full drum length

d) High voltage test.

22.0 PACKING :

22.1 The cables, as per specified delivery lengths, shall be securely wound /packed in non-

returnable, well seasoned sturdy wooden drums, with strong reinforcement so as so to



withstand rough handling during transport by rail, Roads etc., The packing should

withstand storage conditional in open yards. The cable drums shall conform to IS 10418

1982 or equivalent standard.

22.2 The drawings of the cable drums with full detail shall be furnished, and got approved

before dispatch.

23.0 SEALING OF CABLE ENDS ON DRUMS :

23.1 The cable ends shall be sealed properly so that Ingress of moisture is completely

prevented. The individual core endings shall be sealed effectively with water resistant

compound applied over the core ad provided with a heat shrinkable or push-on or Tapex or

cold shrinkable type cap of sufficient length with adequate cushion space so that the

conductor does not puncture the cap in case of movement of the core during unwinding or

laying. Before sealing, the semi conducting layer on the cores may be removed for about 2

mm at each end, to facilitate checking the insulation resistance from one end, without

removing the sealing cap at the other end.

23.2 The three cores should have an overall heat shrinkable or push-on or Tapex or cold

shrinkable type cap with adequate end clearance, and sufficient cushioning to prevent

puncturing of the overall sealing cap due to stretching of the cores. The sealing cap shall

have sufficient mechanical strength and shall prevent ingress of moisture into the cable.

The ends of single core cable shall also be sealed on the same lines to prevent entry of

moisture.

24.0 CABLE LENGTHS :

24.1 The cables shall be supplied in continuous lengths of 250M in case of 3 core cable with

tolerance of + or – 5% of drum length.

It is preferable to manufacture the cable to required lengths as required by the field

conditions to have minimum joints. The turn key contractor will furnish the required drum

lengths in advance

25.0 QUANTITY TOLERANCE

A +3% tolerance shall be allowed on the ordered quantity.

26.0 MARKING:

26.1 The packed cable drum shall carry the following information, clearly painted or stenciled

a) The letters CESU

b) Reference to Standard and ISI mark

c) Manufacturer’s Name or trade mark.

d) Type of cable & voltage grade

e) Number of cores

f) Nominal cross-sectional area of conductor.

g) Cable code

h) Length of cable on the drum

i) Direction of rotation

j) Gross weight

k) Country of Manufacture

l) Year of Manufacture



m) Purchase order and date

n) Address of consignee

27.0 GUARANTEED TECHNICAL PARTICULARS:

Guaranteed technical particulars of the cables to be furnished with the Bid are enclosed.

28.0 DRAWING & LITERATURE

28.1 The following shall be furnished along with the tender a) Cross sectional drawings of the cables, giving dimensional details for each size of

cable.

b) An illustrated literature on the cable, giving technical technical information, on

current ratings, cable constants, short circuit ratings, derating factors, for different

types of installation, packing date, weights and other relevant information.



GURANTEED TECHNICAL PARTICULARS TO BE

FURNISHED BY THE BIDDER

1. CABLES a) Manufacturer

b) Trade Name

2. Type of Cable

3. Applicable specification & Standards

4. Voltage Class

5. Whether suitable for extrusion technique is employed in the manufacture of conductor

screen

6. Whether triple extrusion technique is employed in the manufacture of conductor screen

7. Permissible voltage and frequency variation for satisfactory operation

8. Continuous Current Rating for standard conditions indicated in specifications:

c) Air (450 C Ambient)

d) In Ground (350 C)

e) In Duct

f) In Trench

9. De-rating factors for various laying conditions

10. Conductor

a) Material

b) Shape of conductor

c) Nominal area of cross section

d) Number of strands per core

e) Diameter of Wire (before compacting and stranding)

f) Diameter and size of conductor

11. Conductor Screening

a) Type

b) Material

c) Nominal thickness

d) Continuos working temperature

e) Maximum allowable temperature at the termination of short circuit

12. Insulation

a) Material

b) Thickness of Insulation

c) Thickness of Insulation between cores

d) Thickness of Insulation between cores and inner sheath

e) Tolerance of thickness in insulation

f) Diameter of core over insulation

13. Specific Insulation Resistance at 900C

14. Process of curing

15. Whether XLPE Insulation filled or unfilled

16. Insulation Screening:

a) Material Thickness

b) Thickness of semi conducting part

c) Thickness of metallic part

d) Size of copper tape

e) Whether overlapping provided



f) Current carrying capacity for continuous rating

g) Current carrying capacity for short circuit rating for 1 minutes

h) Diameter of cable over screening

i) Whether insulation screen is removable without the application of heat

17. Inner Sheath

a) Material

b) Extruded

c) Minimum thickness

d) Diameter of cable over inner sheath

18. Armouring:

a) Material

b) Type of Armouring

c) Diameter of wire

d) Whether galvanized

e) Diameter of cable over Armouring

f) Current carrying capacity of Armor

19. Outer Sheath:

a) Material

b) Minimum thickness of sheath

c) Tolerance over thickness of sheath

d) Overall diameter of cable

20. Scheme for identification of cable

21. Allowable/attainable maximum conductor temperature when carrying rated current

continuously

22. Cable constants:

a) DC Resistance per core 200 C

b) AC Resistance per core at operating temperature

c) Reactance

d) Capacitance

e) Insulation Resistance at 270C

f) Loss tangent

g) Dielectric constant – Maximum cable charging current at normal operating voltage

23. Factory Tests (Enumerate in detail for each type of cable)

24. Is the offered cable guaranteed to safely withstand continuous conductor temperature at

900C and also safely withstand temperature upto 1300C for a duration of one hundred

hours per year.

25. Are the offered Three core cable guaranteed to perform satisfactorily under installation

conditions specified? If ‘Yes’ furnish relevant calculations in support including the following

data:

a) Induced voltage in the Amour when a 500 mtr long cable is carrying current

b) Induced voltage and the circulating current in the copper tape



Section-IV

HT cable joints and terminals



TECHNICAL SPECIFICATIONS FOR HEAT SHRINKABLE CABLE JOINT KITS FOR

CABLE TERMINATIONS AND JOINTS

1.0 GENERAL:

1.1.

he term heat shrink refers to extruded or moulded polymeric materials which are cross linked

to develop elastic memory and supplied in expanded or deformed size or shape.

2.0 QUALIFYING EXPERIENCE:

2.1. The kits should have satisfactory performance record in India in excess of 5 years supported

with proof of customers having had satisfactory use of these kits in excess of 5 years.

3.0 HEAT SHRINKABLE MATERIAL:

3.1. The heat shrinkable material component used in the joint shall have been produced in a

systematic procedure as follows:

a) The required materials shall be mixed and extruded into the required shape and then cross-

linked by irradiation or any other appropriate chemical process. The components are then

warmed and stretched by a predetermined amount and allowed to cool in the extruded

shape. The cross-linking shall create a memory and when heated again, the same shall

come back to its original shape at which it was cross-linked. Heat shrinkable tubes can be

reduced to 30% of its expanded dimension by heating.

b) The volume resistivity of the sleeves shall be 108 ohm-cm and the dielectric constant of

around 15 to 30. The limiting temperature shall not be less than 100°C for longer duration

and 250°C for one minute.

4.0 TYPE TEST REPORTS:

The Joints and terminations should have been subjected to all the type tests and type test

reports not later than 5 years on the day of Bid opening shall be furnished for verification.

5.0 ELECTRICAL CLEARANCES:

The electrical clearances required for a Indoor/Outdoor termination and a straight through

joint is shall be as per standards

6.0 COMPRESSION TYPE TUBULAR TERMINAL ENDS:

The materials used in the terminals shall be Aluminum of grade 19501 conforming to IS

5082 - Specifications for wrought aluminum and aluminum alloys bars, rods, tubes and

sections for electrical purposes. The finish inside the barrel shall either be suitably

roughened throughout the crimping length of terminal end or provided with suitable grease

based compound with abrasive action. Edges and corners shall be free from burrs and sharp

edges. The terminals shall meet the requirements of IS 8309 - Specification for Compression

type tubular terminal ends for aluminum conductors of insulated cables.



7.0 JOINT KITS:

The requirements contained in a typical joint Kit are as follows:

a) Heat shrinkable or push-on or Tapex or cold shrinkable type clear

insulating tubes

b) Stress control tubing where necessary

c) Ferrule insulating tubing for joints.

d) Conductive cable break outs for terminations, non tracking, erosion and

e) Weather resistant tubing both outer / inner

f) Non tracking erosions and weather resistant outdoor sheds in case of

terminations

g) High permittivity mastic wedge Insulating mastic.

h) Aluminum crimping lugs of ISI specification.

i) Tinned copper braids

j) Wrap around mechanical protection for joints.

k) Cleaning solvents, abrasive strips.

l) Plumbing metal.

m) Binding wire etc. adequate in quantity and dimensions to meet the service

and test conditions.

The kit shall contain a leaflet consisting of detailed installation instructions and shall be

properly packed with shelf life of over 3 years.



ANNEXURE - I

SPECIFICATIONS FOR MATERIAL PROPERTIES AND OTHER TECHNICAL REQUIREMENTS

FOR HEAT SHRINKABLE CABLE TERMINATIONS AND JOINTS SUITABLE FOR 11 kV

SCREENED CABLES/XLPE CABLES

1.0 GENERAL:

The term heat shrink refers to extruded or moulded polymeric materials which are cross

linked to develop elastic memory and supplied in expanded or deformed size or shape. The

subsequent heating results in shrinking down to original size and shape. The manufacturer of

kits besides stating the properties of each component of the kit as indicated below and as per

the detailed specifications given in Enclosures-I(A), I(B) & I(C) should also state the source of

origin of each component viz; whether locally manufactured or imported in raw material form

and processed. The manufacturing activity carried out on each component should be stated.

Also, in case the kit is assembled with components imported from two or more foreign

suppliers, the manufacturers should give documentary proof supported by the foreign

manufacturers confirming that the kit assembled utilizing components of different suppliers are

guaranteed by them.

2.0 QUALIFYING EXPERIENCE:

The kits should have satisfactory performance record in India in excess of 5 years supported

with proof of customers having had satisfactory use of these kits in excess of 5 years.

3.0 PERFORMANCE TESTING AT CPRI or any other authorized Govt.Laboratory.

The successful contractor/bidder should undertake the testing of termination and jointing kits

at Lab in the presence of CESU Engineers as per the performance type test sequence given

below. For this purpose, the kit shall be selected by CESU Engineers in the manufacturer’s

premises and sealed by the Engineer before taking it to Lab.

Typical atmospheric conditions during the tests

SL No. Particulars Details

1 Amb. Temperature Maximum 450 C

Minimum 100 C

2 Atmospheric pressure 963 to 987 m. bar

3 Relative Humidity 50 – 90 %



Test sequence

Sl No Test Sequence Test Voltage Test results shall be as

follows

1

Impact a wedge shaped weight of 4 kg having a 90⁰

angle with a 2 mm radius shall be dropped freely 6

times from a height of 2.0M. On to the sample. The

drops shall be distributed over the length of the joint

and at right angles to the axis of the

joint,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

.(Electricity Council Engg.C.81)

No visual damage

2 AC voltage withstand

(IEC Pub 60) 1 min 35 kV

Shall withstand

satisfactorily

Indoor -75 kV

3 Impulse voltage withstand

test (IEC Pub 60 & 230)

10 positive and 10

negative 1.2/50

micro seconds

between each

conductor & the

grounded sheath or

screen

Outdoor95 kV

-do-

4 Load Cycling

63 cycles, 5 hrs

heating, 3hrs

cooling

conductor

temperature

screened : 75⁰ C

15 kV -do-

5 Thermal short circuit

1 Sec. symmetrical

fault with sheath

temp. as per cable

Spec.

-do-

6 Load Cycling Repeat 15 kV -do-

7 A/C voltage withstand 4 hrs 24 kV -do-

Indoor -75 kV

8 Impulse voltage withstand Repeat

Outdoor95 kV

-do-

9 D/C voltage withstand 30 Min. 48 kV -do-

10 Humidity indoor termination

Conductivity 800

S/Cm., 100 hrs

spray rate 0.41/Cu.

M/h

7.5 kV -do-



ENCLOSURE – I (A)

MATERIAL SPECIFICATION FOR HEAT SHRINKABLE TUBING

Requirement Test Test

Method Non-Tracking

Tubing

Stress

Control

Tubing

Ferrule insulating

tubing

Clear

insulating

tubing

Inner

Outer

tubing

for Joint

Tensile

Strength

ISO 37 8 N/mm²

Min.

14

N/mm²

Min.

10 N/mm²

Min.

12 N/mm²

Min.

14 MPa

Min.

Ultimate

Elongation

ISO 37 300 %

Min.

250 %

Min.

300 %

Min.

200 %

Min.

500 %

Min.

Accelerate

d Ageing

168 Hrs. at

120⁰C

ISO 188

Tensile

Strength

ISO 37

Min.

7.5 N/mm²

Min.

13

N/mm²

Min.

10 N/mm²

Min.

12 N/mm²

Min.

14 MPa

Min.

Ultimate Elongation

ISO 37 200 % Min.

130 % Min.

300 % Min.

200 % Min.

300 % Min.

Thermal

Endurance

IEC 216 110⁰ C

Min.

90⁰ C

Min.

105⁰ C

Min.

110⁰ C

Min.

120⁰ C

Min.

Electric

Strength

IEC 243

Wall Elec.

Thkn. Strn.

(Normal) KV/CM

Wall Elec.

Thkn. Strn.

(Normal) KV/CM

Wall Elec.

Thkn. Strn.

(Normal) KV/CM

100

kV/CM

Min.

3.0 100

mm. Min.

3.0 100

mm. Min.

*1.3

100 mm.

Min.

Volume

Resitivity

IEC 93 1 × 10⁸ OHM-CM

Min.

5 × 10 ¹⁰

OHM-CM

Min.

1 × 10 ¹³ OHM-CM

Min.

1 × 10 ¹⁶ OHM-

CM Min.

1 × 10 ¹²

OHM-CM

Min.

Dielectric

IEC 250

5.0

Max.

15.0

Min.

5.0

Max.

3.5

Max.

5.0

Max.

Tracking

and

erosion

resistance

ASTM

D2303

No tracking erosion

to top surface or

flame failure after:

1 HR at 2.5 kV

1 HR at 2.75 kV

1 HR at 3.0 kV

-

KA 3C

KA 1

11 Dynamic short circuit

(VDE 0278) 63 kA -do-

12 Salt frog outdoor terminations 224 Kg/m³ 7.5 kV -do-



20 Mins at 3.25kV

Water

absorption

ISO/R 62

Procedure A

1 % Max. AFT. 14

days at (23 ± 2)⁰C

1 % Max.

AFT. 14

days at

(23 ± 2)⁰

C

1 % Max. AFT. 14

days at (23 ± 2)⁰C

0.5 % Max. AFT.

14 days at (23±

2)⁰ C

0.2 %

Max. AFT.

14 days at

(23 ± 2)⁰

C

Resistance

to liquids

ISO 1817

Transformer

oil to VDE

0370

immersion

& days at

(23 ± 2)⁰C

Tensile

Strength

ISO 37

5 N/mm²

Min.

13

N/mm²

Min.

7.5 N/mm²

Min.

- 14 MPa

Min.

-Ultimate

Elongation

ISO 37

250 %

Min.

250 %

Min.

250 %

Min.

- 300 %

Min.

MATERIAL SPECIFICATION FOR HEAT SHRINKABLE MOULDED PARTS

Requirement

Sl No Test Test Method

Sheds Conductive Break-outs

1 Tensile Strength ISO 37 8 N/mm² 9 N/mm²

2 Ultimate Elongation ISO 37 300 % Minimum. 230%

3 Accelerated Ageing

168 Hrs. at 120ºC ISO 188

4 Tensile Strength ISO 37 7.5 N/mm² Minimum. 9 N/mm²

Minimum.

5 Ultimate Elongation ISO 37 200 %

Minimum.

150 %

Minimum.

6 Thermal Endurance IEC 216 110ºC

Minimum.

105ºC

Minimum.

Wall Elec. Thkn.

Strn. (Normal) KV/CM -

7 Electric Strength IEC 243

<3.0 100 mm. Minimum.

8 Volume Resistivity IEC 93 1 × 10 ¹³ OHM-CM Minimum. 200 OHM-CM Max.



ENCLOSURE- I(C)

MATERIAL SPECIFICATION FOR HEAT SHRINKABLE ADHESIVE/SEALANTS

Requirement

Test Test Method Black Insulator Mastic Sealant break-out and sheds

Softening

Point ASTM E28 (115 ± 10)⁰ C

Electric

Strength IEC 243 130 kV/CM Min. 80 kV/CM Min.

Volume

resistivity IEC 93

1 × 10 ¹⁴ OHM-CM

Min.

Water

absorption

ISO/R 62

Procedure A

1 % Max. AFT. 1 day

at (23 ± 2)⁰ C

1 % Max. AFT. 1 day at

(23 ± 2)⁰ C

Corrosive

effect 16 Hrs.

ASTM

D2671

Method-B

No corrosion

9 Dielectric constant IEC 250 5.0 Maximum. -

10 Tracking and erosion

resistance ASTM D2303

No tracking erosion to top

surface or flame failure after:

1 HR at 2.5 kV

1 HR at 2.75 kV

1 HR at 3.0 kV

20 Mins. at 3.25 kV

-

11 Water absorption ISO/R 62 Procedure A 1 % Max. AFTER. 14 days at

(23 ± 2)º C

1 % Max. AFTER. 14

days at (23 ± 2)ºC

12 Resistance to liquids ISO 1817

13 Transformer oil to VDE 0370 immersion & days at (23 ± 2)º

C

Tensile Strength ISO 37 5 N/mm² Minimum. 7.5 N/mm²

Minimum. 14

Ultimate Elongation ISO 37 250 %

Minimum.

150 %

Minimum.



at 121⁰ C

Adhesive peel

strength

substrate 2/1

as detailed

in master

Spec.

-

Below- 30⁰ C

NTR/ NTR 25N/25 mm Min.

NTR/ CON 20N/25 mm Min.

NTR/ AL 20N/25 mm Min.

NTR/ Pb 20N/25 mm Min.

T.E.R.T ASTM

D2303 -

No tracking erosion to top surface or

flame failure after :

1 HR at 2.0 kV

1 HR at 2.5 kV

1 HR at 2.75 kV

ANNEXURE – I(D)

CLASSIFICATION OF SOIL STRATA

1.00 Ordinary Soil:

This shall comprise of vegetable or organic soil, turf, sand, sandy soil, silt, loam, clay, mud, red

earth, suade, peat, black cotton soil, soft shale, loose murrum, mud debris, concrete below

ground level, a mixture of all these and similar material which yields to the ordinary application

of pick, shovel, rake or other ordinary digging implement. Removal of gravel or any other

modular material having diameter in any one direction not exceeding 75 mm, such occurring

strata shall be deemed to be covered under this category.

2.00 Hard Soil:

This shall include :

1) Stiff heavy clay, hard shale or compact murrum requiring grifting tool or pick or both

and shovel closely applied.

2) Gravel, soft laterite, kankar and cobble stone having maximum diameter in any one

direction between 75 mm and 300 mm.

3) Soliding of road paths, etc., and hard core.



4) Macadam surfaces such as water bound and bitumen/tar bound.

5) Lime concrete, stone masonry in lime/cement mortar below ground level.

6) Soft conglomerate, where the stones may be detached from the matrix with picks.

7) Generally any material which requires the close application of picks or sacrifiers to

loosen and not affording resistance to digging greater than hardest of any soil

mentioned in item (1) to (6) above.

3.00 Ordinary Rock:

1) Ordinary rock comprising of lime stone, sand stone, hard laterite, fissured rock,

conglomerate or other soft or disintegrated rock which may be quarried or split with

crow bars.

2) Unreinforced cement concrete which may be broken up with crow bars or picks and

stone masonry in cement mortar below ground level.

3) Boulders which do not require blasting having maximum diameter in any direction of

more than 300 mm found lying loose on the surface or embedded in river bed, soil,

talus slope wash and terrace material of dissimilar origin.

NOTE : Hard laterite does not require blasting. It is to be classified under

ordinary rock which does not require blasting.

4.00 Hard Rock:

This shall comprise:

1) Any rock or cement concrete or RCC for the excavation of which the use of mechanical

plant or blasting is required.

Section-V

Cable Laying Methodology



CABLE LAYING

1.0. Notwithstanding anything stated in these specifications, CESU reserves the right to assess

the bidder’s capability to fulfill the scope of the bid, should the circumstances warrant such

assessment.

2.0. DESIGN – WORKMANSHIP AND INTERPRETATION OF CLAUSES :

2.1 The design and quality of goods supplied and the workmanship shall be in accordance

with the best engineering practice to ensure satisfactory performance of the system

throughout the service life.

2.2 The goods and accessories offered shall be complete in all respects. Any material and /

or component thought not specifically stated in this specification but is necessary for

trouble free and successful operation shall be deemed to be included. All such

components, accessories, etc., shall be supplied at no extra cost.



2.3 The goods supplied shall be such that components, accessories of the same type shall

be interchangeable. Likewise similar or corresponding parts, components / accessories

shall also be interchangeable.

2.4 Wherever and whenever a material or article is specified or described by the name of a

particular brand, manufacturer, vendor, the specific item mentioned shall be understood

as establishing type, function, quality and not as limiting competition. However bidders

may offer other similar components / accessories provided they meet with the required

standards, design, duties and performance.

2.5 Goods and accessories so offered shall conform to type test and shall also be subjected

to acceptance and routine tests in accordance with the requirements stipulated in this

specification. The CESU reserves the right for repeating any or all of the type tests to be

conducted on the goods supplied.

3.0. STANDARDS

3.1. Except as modified by this specification all materials to be supplied shall conform to the

requirements of the latest editions of the following standards:

a) IS 1255 Code of practice for Installation and maintenance of power cables up to

33kV and including 11 KV rating

b) IS 7098 (Part 2 ) Cross – linked Polyethylene PVC sheathed cables.

c) IEC 332 Tests on erected cables

d) IEC 1329 Allied steel, tubes, tubular and other rough iron fittings.

e) IEC 2629 Recommended practice for hot dip galvanizing of iron & steel.

f) ASTM-D : 2671 Standard method of testing heat shrinkable or push on Tapex or

cold type tubing for electrical use.

g) ASTM-D 3111 Flexibility determination of hot melt adhesives by mandrel bend test

method.

h) IEC 60 High Voltage test

i) IS 3043 Code of practice for Earthing

j) IS 8309 Compression type tubular terminals for aluminum conductors of insulated

cable.

4.0. DEVIATION IN SPECIFICATION:

4.1. All deviations in specification shall be brought out by the bidder and detailed clause by

clause in appropriate annexure form.

4.2. Deviations brought out elsewhere or in any other format will not be considered and are

liable for rejection. The CESU in such an event shall also deem that the bidder has

conformed to the clauses in this specification scrupulously.



4.3. Deviation in specification shall if possible be quoted with reference to standards. The

bidder shall then furnish an authentic English version of such standards.

5.0. LOCAL CONDITIONS :

5.1. It will be imperative on each bidder to fully inform himself of the local conditions and

factors which may have any effect on the execution of the supply and services covered

under these documents and specification.

5.2. It shall be understood and agreed that such factors will have been properly investigated

and considered in any bid that is submitted. The purchaser will entertain no claim for

financial adjustment to the contract awarded under these specifications and

documents. No change in the time schedule of the contract, or any financial

adjustment arising thereof that are based on incorrect information, or its effect on the

cost of the contract to the bidder shall be permitted by the Purchaser.

5.3. Bidders are advised to visit the various areas where the U.G. cables are access, road

/drain / footpath crossings to enable them to make proper costing and then quote

accordingly.

6.0. DETAILS OF WORK :

a) The scope of work involves Supply and laying, testing and commissioning of 11KV,

3 Core, 400 Sq.mm XLPE UG cable.

b) Laying of 3 core, 11 kV, 400 sq mm UG Cables by trenchless technology adopting

horizontal Boring (HDD) by machines with adequate drawing capacity.

6.1. The contract will be on the turnkey basis and all the required materials as per

specifications are to be procured by the contractor himself. The specifications for the

major equipment to be procured are as follows :

a) XLPE Cables of above size as per specifications enclosed.

b) Cable jointing termination and straight through kits as per specifications enclosed.

6.2. All the other materials like coarse and fine aggregate sand, joint markers, sealing,

route markers, cable support clamps, terminals and inline connectors, sealing

compounds etc., whether specifically mentioned or not in these specifications are

deemed to have been included in the scope of supply and installation. Similarly, the

contractor has to arrange for all the tools and plants required for the works at his own

cost.

7.0. SERVICE CONDITIONS :

7.1. The cables are being laid in the Cuttack district, Odisha, where temperature, humidity

effect is heavily experienced.

7.2. The climatic conditions are prone to wide variations in ambient temperature, humidity

etc., and the accessories offered shall be suitable for installation under the above



tropical conditions, where moderately hot and humid conditions conducive to dust, rust

and fungi growth, prevail at site.

7.3. The underground cables are to be laid along Ring Road of Kathajodi River, where other

utility services like telephone,EHT lines and PHD lines are encountered.

8.0. CLIMATIC CONDITIONS

Climatic conditions Sl No Particulars Details

1 Location Cuttack,Odisha

2 Altitute Not exceed 100 M above

MSL- Almost at the Sea level

3 Max. Ambient air temperature : 45º C

4 Max. Daily average air temp : 38 º C

5 Minimum ambient air temp : 10 º C (Max) 5 º C (Min)

6 Ground temperature at depth of laying assumed : 35 º C (Max)

7 Isoceraunic level : 45

8 Avg. annual rainfall : 1450 mm

9 Avg. number of rainy days per annum 60

10 Climate :

The climate in the city of

Cuttack is Tropical moderately

hot and humid. subsoil water

at certain location at depth of

burial of cables may be

anticipated .

11 Soil : Normally wet

9.0. COMPLIANCE WITH REGULATIONS :

9.1. All services carried out by the bidder / sub contractor shall be as per the requirements

of the I.E.Act-2003 & Indian electricity Rules – 1956, OERC and all other applicable

statutory laws governing the services in the state of Odisha

9.2. Particular attention is drawn to the necessity of consulting the local authorities and the

administrative heads concerned with the operation and maintenance of roads, railways,

telegraph and telephone services, water supply and sewerage and other public utilities.

9.3. The CESU will assist in obtaining permission from civil authorities for boring in the

Roads, cutting roads. However the necessary charges shall be paid by the bidder

sufficiently in advance. CESU will also co-ordinate with the traffic police authorities for

regulation of traffic during cutting of roads.

10.0. INSPECTION BY ELECTRICAL INSPECTOR



10.1. All Electrical installations and equipments are to be inspected and approved by the

Chief Electrical Inspector to the Government of Odisha, before commissioning.

10.2. The Contractor will arrange for the payment of the necessary fees for inspection.

10.3. Any defects pointed out by the Electrical Inspector, shall be corrected or attended by

the bidder /subcontractor at his own cost and he shall pay, for subsequent inspection

charges to the Electrical Inspector, for obtaining approval.

11.0. INSTALLATION OF U.G. CABLES

11.1. Method Of Ug Cable Laying : Laying 11 kV HT UG cables at a depth not more than

3 Mtrs, by trenchless technology ,adopting horizontal boring using appropriate standard

machines. Boring & Drawing of cable including preparation at site

11.2. ROUTE PLANS: Tentative cable route plans will be furnished to the contractors,

indicating the roads road crossings, findings by excavating trial holes by the contractor /

sub contractor. The work should be taken upon only after CESU Engineers approve

the final route. The CESU reserves the right to change, alter deviate the route on

technical reasons.

11.3. TRIAL PITS : The bidder shall excavate trial pits, for alignment purpose at

appropriate distance apart as warranted by the local conditions, keep a record of the

findings and close the trial holes properly to avoid hindrance / accidents to pedestrian

traffic. The final route / alignment of the cables shall be decided based on the finding of

the trial holes. 11.4. It is the responsibility of the bidder to maintain as far as possible the required statutory

clearances from other utility services.

11.5. Any damage caused, inadvertently to any utility services shall be the sole responsibility

of the contractor.

12.0. STATUTORY NOTICES AND WAY LEAVES

12.1. The Contractor shall arrange the necessary way leaves from the concerned public

utility authorities and CESU shall give the required assistance to the contractor in

completing the project.

13.0. LAYING OF CABLES

13.1. 11 kV H.T 3 core HT UG cables: Laying 11 kV HT UG cables by trenchless technology by adopting horizontal boring at

a depth not more than 3 Mtrs using appropriate standard machines.

14.0. LAYING OUT THE CABLE :

14.1. 11 kV H.T 3 core HT UG cables:



The cable shall be pulled / drawn smoothly in the bored holes by the horizontal boring

machine itself. The excavated cable trench shall be drained of all water and bed

surface shall be smooth, uniform and fairly hard before laying out the cable. The

cable shall be pulled in the trench only on cable rollers spaced out at uniform

intervals to prevent damage to cable. The laying out process shall be smooth and

steady, without subjecting the cable abnormal tension. The cable laid out shall be

smoothly and evenly transferred to the ground after providing sand cushion and shall

never be dropped. All the snake bends in the cable shall be straightened out.

14.2. Loop Cable : One complete loop of the cable has to be kept at each

termination point.

15.0. FLAKING

15.1. Wherever it is not possible to lay of the entire cable drum length, the cable should be

cut and properly sealed and if it is necessary to remove the cable from the drum, it

should be properly flaked. Such cable lengths should be properly stored at site. 16.0. CABLES AND OVER BRIDGES :

16.1. Wherever the cable route crosses bridges the cable shall be laid in the ducts, if provided,

by removing and replacing the R.C.C. covers and filled with sand cushion. 16.2. In the absence of the cable ducts over bridges, the cable shall be laid in suitable size

steel/G.I. pipes or as directed by the engineer-In-charge and the pipe covered by cement

concrete if necessary to protect from direct sunrays.

17.0. CABLE CROSSING OPEN DRAINS WITH LONG SPAN :

17.1. Wherever the cable to cross open drains with a long span, the cable shall be laid in

suitable size G.I. pipe, properly jointed with suitable collars. The GI pipe shall be firmly

supported on pillars, columns, or suitable support of R.C.C. foundation with stone masonry

in cement mortar 1:4 17.2. Wherever the U.G. cable has to cross the sewerage or water supply line the U.G. cable

has to be taken below them maintaining adequate clearance. Further wherever the U.G.

cable runs parallel to the telephone cable a separation distance of at east 300-mm shall be

maintained. 17.3. The cables shall be laid in stoneware pipe wherever the cable and trench crosses private

roads, gates, etc. In order to avoid inconvenience the stoneware pipe should be laid first

after excavation and excavated trench shall be back filled, compacted and surface properly

redone to restore that original condition.

18.0. CABLE AND JOINT MARKERS



18.1. Permanent means of indicating the positions of joints on site should be provided. During

the course of permanent reinstatement cable and joint markers, should be laid directly

above the route of the cable and the position of the joint respectively. 18.2. Wherever it is not possible to place the marker directly over the cable route or joint the

marker should be suitably placed near the cable route or joint on which the distance of the

cable route or joint at right angles to and parallel to the marker should be clearly indicated. 18.3. The position of fixing the markers will be at the discretion of the Engineer-In-charge.

19.0. JOINTING OF CABLES

19.1. GENERAL: It shall be noted that the U.G. cables are of XLPE insulation and needs

special care in jointing. The cable jointer and his assistant shall have experience in

making joints / terminations. Jointing work should commence as soon as two or three

lengths of cables have been laid. All care should be taken to protect the factory-plumbed

cap/seal by laying the end solid in bitumen until such time as the jointing is commenced.

19.2. Jointing of cables in carriage ways, drives, under costly paving, under concrete or asphalt

surfaces and in proximity to telephone cables and water mains, should be avoided

whenever possible.

19.3. JOINT PITS: The joint pits should be sufficient dimensions as to allow jointers to work with

as much freedom of movement and comfort as cables proposed to be jointed. The sides

of the pit should be draped with tarpaulin sheet to prevent loose earth from falling on the

joint during the course of making. The pit should be well shored with timber, if necessary.

An overlap of about 1.0 mtr of the cables to be jointed may be kept, for allowance to

adjust the position of the joint. When two or more cables are laid together the joints shall

be arranged to be staggered by 2 to 2.5 mtr. 19.4. SUMP PITS: When jointing cables in water logged ground or under monsoon conditions,

a sump pit should be excavated at one end of the joint pit in such a position so that the

accumulating water can be pumped or bailed out by buckets without causing interference

to the jointing operation. 19.5. TENTS: A tent should be used in all circumstances wherever jointing work is carried out in

the open irrespective of the weather conditions. The tent should be so covered as to have

only one entrance and the back facing the direction of the wind. The tent cover should be

properly weighted or tied down on the sides.

19.6. MEASUREMENT OF INSULATION RESISTANCE: Before jointing is commenced the

insulation resistance of both sections of the cable to be jointed should be checked by

insulation resistance testing instrument. An insulation resistance – testing instrument of



2.5/5 kV shall be used. The Insulation Resistance values, between phases and phase to

earth shall be recorded. The actual jointing operation shall start only after the approval of

the engineer in charge of works.

19.7. PRECAUTIONS BEFORE MAKING A JOINT OR CUTTING A CABLE. The cable end seals should not be opened until all necessary precautions have been

taken to prevent circumstances arising out of rainy/inclement weather conditions, which

might become uncontrollable. The cable seals should be examined to ascertain if they are

intact and also that the cable ends are not damaged, if the seals are found broken or the

lead sheath punctured, the cable ends should not be jointed until after due examination

and testing by the engineer-in-charge of the works.

19.8. PRECAUTIONS TO BE TAKEN ON LIVE CABLES IN SERVICE

Sometimes it becomes necessary that a H.V. cable, which is in service, be cut for making

a straight joint with a new cable. In such cases work on joint should start only after the in

service cable is properly identified, isolated, discharged, tested and effectively earthed.

Search coils interrupters or cable-identifying instruments should be used for this purpose.

19.9. IDENTIFICATION NUMBERS / COLOURS AND PHASING : The cables should be laid

and jointed number to number or colour to colour shown on the core identifying marks and

prevent cross jointing. In all cases, the cables should be tested and phased out, and

more particularly so when the cable terminates at Ring Main Unit / Sub-station. 19.10. MAKING A JOINT: The Heat shrinkable joints used shall be conforming to the

specification vide Sec-iv. Alternatively push-on or Tapex or cold shrinkable type can be

used with the approval of CESU. The contractor should furnish all the technical

particulars of these joints and obtain approval only in case they are found superior to the

heat shrinkable joints. Epoxy based joints are not permitted. Comprehensive jointing

instructions obtained from the manufacturer of joint kits shall be meticulously followed.

The connection of the earth wires should be done using flexible bonds connected to cable

sheath using clips or soldering. Aluminum conductor strands shall be joined be joined by

mechanical compression method, using suitable die and sleeve with a good quality tool.

The joints shall conform to specification as per IS 13573-1992.

19.11. TRANSITION JOINTS: Wherever straight through joints will have to be made with

existing cables under the following conditions, the contractor shall arrange such type of

joints and execute them with skilled jointers.

(1) Between cables having two different types of insulation viz., paper and XLPE (2) Between cables having two different types of conductor material, viz. copper

and aluminum.



(3) Or a combination of the above

The transition joints shall conform to IS 13705 – Transition joints for cables for

working voltages from 11 KV upto and including 33 KV – performance

requirements and type tests.

19.12. CABLE TERMINATIONS: Cable terminations required are both indoor and outdoor type

and invariably be of heat shrinkable type conforming to the specifications vide Sec-iv. .

Alternatively push-on or Tapex or cold shrinkable type can be used with the approval of

CESU with appropriate sheds for rainwater in case of outdoor terminations. All the

technical particulars to establish the superiority in the performance of these joints shall be

furnished while seeking approval. The terminations shall conform to specifications as per

IS 13573 – 1992. The instructions furnished by the manufacturer of termination boxes/kits

should strictly be followed.

19.13. Whenever a cable raised from the trench to end in termination, to be finally connected to

an overhead line or transformer, the following instructions should be complied with –

(i) One coil to made and left in the ground for future needs

(ii) The rise of cable, immediately from the ground level should be enclosed in

suitable diameter GI pipe to height of 2 mt.

(iii) The balance portion of the cable should be neatly curved, in ‘S’ shape.

(iv) The cable and pipe should be properly fastened by using appropriate clamps

/support. The hardware of clamps shall be painted with red oxide and

enamel paint or galvanized.

(v) The lugs on the termination shall be compressed with a suitable compression

tool.

20.0. EARTHING AND BONDING

20.1. The metal sheath and Armour should be efficiently bonded and earthed at all terminals

to earth electrodes provided. The cross sectional area of the bond shall be such that the

resistance of each bond connection shall not exceed the combined resistance of an

equal length of the metal sheath and Armour of the cable.

21.0. TESTING AFTER LAYING AND JOINTING

21.1. All cables after laying and jointing works are completed should be tested systematically

and insulation and pressure tests should be made on all underground cables. 21.2. All test results should be recorded in tabular form in logbooks kept for the purpose 21.3. The cable cores should be tested for :-

(i) Continuity (ii) Absence of cross phasing (iii) Insulation resistance to earth; insulation resistance between conductors.



22.0. H.V. TESTS

22.1. After the laying and jointing work is completed, a high voltage test should be applied to

the cable to ensure that the cable has not been damaged during or after the laying

operations and there is not defect in the joining

22.2. The high voltage tests should be as per IS 1255 or as per international standards. The

H.V. testing instruments shall be brought by the turn key contractor.

23.0. TESTING AND RECORD OF CABLE CONSTANTS :

23.1. When the cable is ready, just before commissioning, the cable constants viz, the

resistance, capacitance and inductance of each conductor should be determined and

recorded, along with frequency at which the values of capacitance and inductance are

determined.

24.0. GUARANTEE

24.1. All the cable joints / termination done by the contractor shall be guaranteed for 12

months from the date of energisation of the complete cable. In the event of failure during

the guarantee period, the restoration work shall be done free of cost by the contractor

within 24 hours of giving notice or else the expenditure incurred by CESU to re-do the

joint / termination will be recovered from the performance guarantee amount held with

the CESU.

25.0. CABLE RECORDS 25.1. Accurate neat plans / sketches, drawn to suitable scale (1 cm = 10M) should be

prepared and furnished by the contractor after the completion of each work.

25.2. All relevant information should be collected at site, during the progress of work and

preserved for preparation of drawings.

25.3. The following essential data should be incorporated on all drawings

a) Size, type of cable or cables.

b) Location of the cable in relation to prominent land mark property, Kerb-line etc., with

depths.

c) The cross section showing where cables are laid in piper or ducts, giving their sizes,

type and depths.

d) Position and type of all joints

e) Location of other cables which run alongside or across the cable route.

f) Position and depths of all pipers, ducts, etc., which are met as obstruction to the

cable route.

g) Accurate lengths from joint to joint

h) Manufacturers name and drum number of the cable, between sections / joint to joint.



Two transparencies and six blue print copies of the cable records prepared as above shall be given to the CESU’s engineer as a part of the contract as soon as the cable is charged.

Section-VI

Lightning Arrestor



TECHNICAL SPECIFICATION OF 11 KV LIGHTNING ARRESTOR

(VOLTAGE CLASS SURGE ARRESTORS)

The specification covers the design, manufacture, shop & laboratory testing before

despatch, supply delivery of 11 KV, Station class heavy duty, gapless metal oxide Surge

Arrestors, insulating base, clamps, complete fittings & accessories suitable for 33 KV

transformers/feeders including arrester's electrode earthing.

1.0 STANDARDS

The design, manufacture and performance of Surge Arrestors shall comply with IS: 3070

Part-3 and other specific requirement stipulated in the specification Unless otherwise,

specified, the equipment, material and processes shall conform to the latest applicable

Indian/International Standards as listed hereunder:

IS: 2071-1993 (Part-1) : Methods of High Voltage Testing General Definitions & Test Requirements.

IS: 2071-1974 (Part-2) : Test Procedures

IS: 2633-1986 : Methods for Testing uniformity of zinc coated Articles.

IS: 3070-1993 (Part-3) : Specification for surge arrestor for alternating current system Metal-Oxide lightening Arrestors without gaps.



IS:4759-1996 : Specification for hot dip zinc coating on Structural Steel and other allied products.

IS: 5621-1980 : Hollow Insulators for use in Electrical Equipment.

IS: 6209-1982 : Methods of Partial discharge measurement.

IS: 6745-1980 : Methods for determination of mass of zinc coating on zinc coated iron and steel articles.

IEC:TC-37 : Test Procedures.

ANSI/IEEE-C.62.11(1982) : Metal Oxide, Surge Arrestor for A.C. Power Circuits.

IEE-99-4 : Surge Arrestors.

The equipment complying with any other internationally accepted standards shall also be

considered if it ensures performance equivalent to or superior to the India Standards.

2.0 GENERAL REQUIREMENT

2.1 The Metal Oxide gap less Surge Arrestor without any series or shunt gap shall be suitable for

protection of UG cable, associated equipment from voltage surges resulting from natural

disturbance like lightening as well as system disturbances.

2.2 The surge arrestor shall draw negligible current at operating voltage and at the same time

offer least resistance during the flow of surge current.

2.3 The surge arrestor shall consist of non-linear resistor elements placed in series and housed

in electrical grade porcelain housing/silicon polymeric of specified creepage distance.

2.4 The assembly shall be hermetically sealed with suitable rubber gaskets with effective sealing

system arrangement to prevent ingress of moisture.

2.5 The surge arrestor shall be provided with line suitable for cable for vertical and horizontal

take off. The earth terminals shall be provided of suitable size. The groundside terminal of

surge arrestor shall be connected with 50x6mm- galvanized strip, one end connected to

the surge arrestor and second end to a separate ground electrode (Electrode type of

earthing). The contractor shall also recommend the procedure which shall be followed in

providing the ear thing/system to the Surge Arrestor.

2.6 The surge arrestor shall not operate under power frequency and temporary over voltage

conditions but under surge conditions, the surge arrestor shall change over to the conducting

mode.

2.7 Surge arrestor shall have a suitable pressure relief system to avoid damage to

the porcelain/silicon polymeric housing and providing path for flow of rated fault currents

in the event of arrestor failure.

2.8 The reference current of the arrestor shall be high enough to eliminate the influence of

grading and stray capacitance on the measured reference voltage.



2.9 The surge arrestor shall be thermally stable and the contractor shall furnish a copy of thermal

stability test with the bid.

2.10 The arrestors for 11 KV system shall be suitable for mounting on transformers as well as in

the yard. The supplier shall furnish the drawing indicating the dimensions, weight etc. of the

surge arrestors for the design of mounting brackets.

2.11 The arrestor shall be capable of handling terminal energy for high surges, external pollution

and transient over voltage and have low losses at operating voltage.

3.0 ARRESTOR HOUSING

3.1 The arrestor housing shall be made up of porcelain/silicon polymeric housing and shall be

homogenous, free from laminations, cavities and other flaws of imperfections that might

affect the mechanical and dielectric quality. The housing shall be uniform brown colour, free

from blisters, burrs and other similar defects.

Arrestors shall be complete with insulating cases, fasteners for stacking units together and

terminal connectors.

3.2 The housing shall be so coordinated that external flashover shall not occur due to application

of any impulse or switching surge voltage upto the maximum design value for arrestor. The

arrestors shall not fail due to contamination. The 11KV arrestors housing shall be designed

for pressure relief class as given in Technical Parameters of the specification.

3.3 Sealed housing shall exhibit no measurable leakage.

4.0 TESTS

4.1 Test on Surge Arrestors

The Surge Arrestors offered shall be type tested not earlier than 5 years before the date of

opening of this tender. The surge arrestors shall be subjected to routine and acceptance

tests in accordance with IS: 3070(Part3)-1993. In addition, the suitability of the Surge

Arrestors shall also be established for the following:

* Residual voltage test

* Reference voltage test

* Leakage current at M.C.O.V.

* P.D. Test

* Sealing test

* Thermal stability test

* Aging and Energy capability test

* Watt loss test

Each metal oxide block shall be tested for guaranteed specific energy capability in addition to

routine/acceptance test as per IEC/IS.

4.2 The maximum residual voltages corresponding to nominal discharge current of 10KA for

steep current, impulse residual voltage test, lightning impulse protection level and switching

impulse level shall generally conform to Annexure-K of IEC-99-4.

4.3 The bidder shall furnish the copies of the type tests and the characteristics curves

between the residual voltage and nominal discharge current of the offered surge arrestor and



power frequency voltage V/s time characteristic of the surge arrestor subsequent to impulse

energy consumption as per clause 6.6 of IS: 3070 (Part-3) offered along with the bid.

4.4 The surge arrestors housing shall also be type tested and shall be subjected to routine

and acceptance tests in accordance with IS: 2071.

4.5 Galvanization Test

All Ferrous parts exposed to atmospheric condition shall have passed the type test and be

subjected to routine and acceptance test in accordance with IS: 2633 & IS: 6745.

5.0 NAME PLATE

5.1 The nameplate attached to the arrestors shall carry the following information: -

* Manufacturing Trade Mark

* Year of Manufacture

* Rated Voltage

* Continuous Operation Voltage

* Pressure relief rated current

* Name of Client-

* Purchase Order Number along with date.

6.0 INSPECTION

6.1 All tests and inspection shall be made in the manufacturer’s works unless

otherwise specifically agreed upon by the manufacturer and purchaser at the time of

placement of purchase order. The manufacturer shall afford to the inspector representing the

purchaser, al reasonable facilities, without charge to satisfy him that the material being

furnished is in accordance with these specifications. The purchaser reserves the right to get

an component/material being used by the manufacturer of the Surge Arrestor tested from

any recognized test house.

6.2 The inspection by the purchaser or his authorized representative shall not relieve

the contractor of his obligation of furnishing equipment in accordance with the specifications.

7.0 DRAWING AND INSTRUCTION MANUALS

Within 15 days of receipt of the order, the successful tenderer shall furnish to the

purchaser the following drawings and literature for approval:

a. Outline dimensional drawings of Surge Arrestor and all accessories. b.

Assembly drawings and weights of main component parts.

c. Instructions manual

d. Drawing showing details of pressure relief value

e. Volt-time characteristics of surge arrestors.

f. Detailed dimensional drawing of porcelain housing/ Silicon polymeric

i.e. internal diameter, external diameter, thickness, height profile,



creepage distance, dry arching distance etc.

GURANTEED TECHNICAL PARTICULARS FOR

11 KV LIGHTNING ARRESTOR

(To be submitted along with offer)

Sl. No. Particulars Bidder’s Offer

1. Name of manufacturer.

2. Type Designation

3. Model (Drawing No.)

4. Applicable Standard

5. No. of units per Arrestors

6. Rated Voltage

7. Nominal discharge current 8/20

micro second wave (KA)

8. Maximum continuous operating Voltage

9. Insulation withstand voltage

power frequency.

10. Maximum Lightning Impulse

Residual voltage (8/20 micro

second wave



11. Maximum steep current Impulse Residual voltage at 10 KA of micro second front time.

12. Maximum Switching Impulse Residual voltage 50 x 100 micro seconds at 500 Amps.

13. Current Impulse withstand capability.

i) Long duration discharge class.

ii) Minimum energy discharge capability

14. Protective Ratio

15. High current impulse withstand value (4 x10 Micro seconds)

16. Pressure relief class.

i) High current

ii) Low current

17. Reference current of the arresters Ambient

18. Current at M.C.O.V. (Maximum Continuous

i) Resistive Current IR

ii) Capacitive voltage IC

19. Temporary over voltage capability

i) 0.1 second

ii) 1.0 Second

iii) 10.0 Second

iv) 100 second

20 a) Total Creepage Distance

b) Protected Creepage Distance

21. Over all dimensions

i) Height

ii) Diameter

22. Cantilever strength KG-M

23. Mounting flange dimensions

24 Minimum Clearance

i) Between Arrestors

ii) Arrestor and adjoining - objects



Section-VII

11kV AB Switch



TECHNICAL SPECIFICATIONS FOR 11kV AB Switch

1.0 SCOPE:-

This specification provides for manufacture, testing at works and delivery For supply of

11KV AB switches. The 11KV AB switches shall conform to IS: 9920 (Part-I to IV)

2.0 AB SWITCHES:-

The 11KV Air Break Switches are required with two poles in each phase. The AB Switches

shall be supplied complete with phase coupling shaft, operating rod and operating handle. It

shall be manually gang operated and vertically break and horizontal mounting type.

2.0.1 The AB Switch shall be designed for a normal current rating of 400 Amps and for continuous

service at the system voltage specified as under:

11 KV AB Switch: 11KV + 10% continuous 50 C/s solidly grounded earthed neutral system.

The length of break in the air shall not be less than 400 mm for 11KV AB Switches.

2.0.2 The 11KV AB Switches are required with post insulators. The AB switches should be suitable

for mounting on the structure. The mounting structure will be arranged by the purchaser

separately. However, the AB Switches shall be supplied with base channel for mounting on

the structure which will be provided by the purchaser. The phase to phase spacing shall be

750mm in case of 11KV AB Switches.

3.0 POST INSULATORS:-

The complete set of three phase AB Switches shall have post insulators.

11KV AB Switches : 11KV Post Insulators



The post insulators should conform to the latest applicable Indian standards IS: 2544

Specification for Porcelain Post insulator Polycon or of compact solid core or long rod

insulators are also acceptable. Creepage distance should be adequate for highly polluted

outdoor atmosphere in open atmosphere. The porcelain used for manufacture of AB

Switches should be homogeneous free from flaws or imperfections that might affect the

mechanical dielectric quality. They shall be thoroughly vitrified, tough and impervious to

moisture. The glazing of the porcelain shall be of uniform brown in colour, free from blisters,

burns and other similar defects. Insulators of the same rating and type shall be

interchangeable.

The porcelain and metal parts shall be assembled in such a manner that any thermal

expansion differential between the metal and porcelain parts through the range of

temperature variation shall not loose the parts or create undue internal stresses which may

affect the electrical or mechanical strength. Cap and base of the insulators shall be

interchangeable with each other. The cap and base shall be properly cemented with

insulators to give perfect grip. Excess cementing must be avoided.

The tenderers shall in variably enclose with the offer, the type test certificate from NABL

accredited testing laboratory and other relevant technical guaranteed particulars of insulators

offered by them. Please note that AB Swiches without type test certificates will not be

accepted.

4.0 Each 11KV Post Insulators should have technical particulars as detailed below:

11 KV

i Nominal system voltage kV (rms) 11

ii Highest system voltage kV (rms.) 12

iii Dry Power Frequency one kV minute withstand voltage (rms) in 35

iv Wet Power frequency one minute withstand voltage (rms) in KV 35

v Power Frequency puncture kV (rms) voltage

1.3 times the actual dry flashover voltage

vi Impulse withstand voltage kV (Peak) 75

vii Visible discharge voltage kV (rms) 9

viii Creepage distance in mm (minimum) 320

5.0 The rated insulation level of the AB Switches shall not be lower than the values specified below:-

Sl. No

Standard

declared voltage

Rated Voltage

of the AB Switches

Standard impulse with stand voltage (positive & negative polarity KV

(Peak)

One Minute power frequency withstand voltage kV (rms)

Across the

Isolating distance

To earth &

between poles

Across

the Isolating distance

To earth & between

poles



i 11KV 12KV 85KV 75KV 32KV 28KV

6.0 TEMPERATURE RISE:-

The maximum temperature attained by any part of the equipment when in service at site

under continuous full load conditions and exposed to the direct rays of Sun shall not exceed

45 degree above ambient.

7.0 MAIN CONTACTS:-

AB Switches shall have heavy duty self-aligning type contacts made of hard drawn

electrolytic copper/brass. The various parts should be accordingly finished to ensure inter

changeability of similar components. The moving contacts of the switch shall be made from

hard drawn electrolytic copper brass. This contact shall have dimensions as per drawing

attached so as to withstand safely the highest short-circuit currents and over voltage that

may be encountered during service. The surface of the contact shall be rounded smooth and

silver-plated. In nut shell the male and female contact assemblies shall ensure.

(i) Electro-dynamic withstands ability during short circuits without any risk of

repulsion of contacts. (ii) Thermal withstands ability during short circuits.

(iii) Constant contact pressure even when the lower parts of the insulator stacks are subjected to tensile stresses due to linear expansion of connected bus bar of flexible conductors either because of temperature variations or strong winds.

(iv) Wiping action during closing and opening. (v) Fault alignment assuring closing of the switch without minute adjustments.

8.0 CONNECTORS:-

The connectors shall be made of hard drawn electrolytic copper or brass suitable for

Raccoon/Dog ACSR conductor for both 11KV AB Switches. The connector should be 4 -bolt

type.

9.0 OPERATING MECHANISM:-

All AB Switches shall have separate independent manual operation. They should be provided

with ON/OFF indicators and padlocking arrangements for locking in both the end positions to

avoid unintentional operation. The isolating distances should also be visible for the AB

Switches.

The AB Switch will be supplied with following accessories:

Sr. No

Item Size of 11KV AB Switch

i

Operating Rod (GI dia) Length 5.50 meter dia 25 mm

ii

Phase coupling square rod (GI) Length 1800 mm Size 25x25 mm

iii Hot dip galvanized Operating handle (GI) 1 No.

The AB Switches shall be capable to resist any chance of opening out when in closed

position. The operating Mechanism should be of robust constructions, easy to operate by

single person and to be located conveniently for local operation in the switchyard. The GI

pipe shall conform to ISS: 1239-68 and the vertical down rod should be provided with

adequate joint in the mid section to avoid bending or buckling. Additional leverage should be



provided to maintain mechanical force with minimum efforts.

All iron parts should be hot dip galvanized. All brass parts should be silver plated and all nuts

and bolts should be hot dip galvanized.

10.0 ARCING HORNS:-

It shall be simple and replaceable type. They should be capable of interrupting line- charging

current. They shall be of first make and after break type.

11.0 BUSH:-

The design and construction of bush shall embody all the features required to withstand

climatic conditions specified so as to ensure dependable and effective operations

specified even after long periods of inaction of these Air Break Switches. They shall be made

from highly polished Bronze metal with adequate provision for periodic lubrication through

nipples and vent.

12.0 DESIGN, MATERIALS AND WORKMANSHIP:-

The successful tenderers shall assume full responsibility for co-ordination and adequate

design.

All materials used in the construction of the equipment shall be of the appropriate class, well

finished and of approved design and material. All similar parts should be accurately finished

and interchangeable.

Special attention shall be paid to tropical treatment to all the equipment, as it will be

subjected during service to extremely severe exposure to atmospheric moisture and to long

period of high ambient temperature. All current carrying parts shall be of non- ferrous metal

or alloys and shall be designed to limit sharp points/edges and similar sharp faces.

The firm should submit the following type test certificate along with the certified copy of the

drawing (from NABL Testing Lab). The type test should be from NABL accredited testing

laboratory & should not be older than 5 years from the date of opening of tender.

1. Test to prove capability of rated peak short circuit current and the rated short time current. The rated short time current should correspond to minimum of 10K Amp and the peak short circuit current should correspond to minimum of 25K Amps.

2. Lightning impulse voltage test with positive & negative polarity. 3. Power Frequency voltage dry test and wet test 4. Temperature rise test 5. Mill volt drop tests

13.0 Dimension of 11KV AB Switches in (Max.) Tolerance 5%.

Sr. Particulars 11KV AB Switch

i

Drawing No. EB/P-6/MPSEB/7 (revised)

dated 01.05.88 ii MS Channel 450x75x40

iii Creepage distance of

Post Insulator

320mm (Min)

iv Highest of Port shell 254 mm v Fixed contact assembly

i) Base 165x36x8

ii) Contact 70x30x6



iii) GI cover 110x44

Spring 6 Nos. vi Moving contract assemble i Base Assembly 135x25x8 ii Moving 180x25x9 iii Bush Bronze Metal iv Thickness of Grooves 7

14.0 CONNECTORS:-

i Connector

(diamentions of each pad) 60x50x8

(Moving & fix both) 60x50x8

(Moving & fix both)

The bidder should provide AB Switches with terminal connectors, set of insulators,

mechanical inter works and arcing horns sets. The base channel for the mounting of AB

Switches shall also be included in the scope of AB Switches. The operating mechanisms

together with down pipe operating handle etc. are also included in the scope of supply.

15.0 ROUTINE TEST CERTIFICATE : -

The Routine test certificate should invariably be submitted in duplicate of each lot offered for

inspection as per ISS: 9920 (part-I to IV). The offers received without Routine test certificate

shall not be entertained.

16.0 ACCEPTANCE TEST : -

At the time of inspection following test shall be carried out: -

a. Physical verification and measurement of dimension.

b. Power frequency high voltage test.

c. Temperature rise test.

d. Mechanical endurance test / operation test.

e. Milli volt drop test.

f. Galvanising test as per ISS: 2633.

17.0 NAME PLATE: -

The name plate in the following design shall be fixed on each AB Switch.

i) Name of supplier :

ii) Name of purchaser : iii) Order No. and date : iv) Rating : v) serial number of unit :

The size of name plate shall be 2” x 1” for 11 kV AB Switch.



Schedule of Guaranteed Technical Particulars for 11 KV AB Switches

No

Particulars

Requirement

To be specified by

the Bidder

1 Type / make To be indicated 2 Maximum permission continuous service

voltage (KV)

12 KV

3 Length of the Break/Phase (Min.) 400 mm 4 Phase to Phase Spacing 750 mm 5 Power Frequency withstand test voltage for

completely assembled switches

A) Against ground i Dry KV 28 KV

ii Wet KV 28 KV B) Across open contact

i Dry KV 32 KV ii Wet KV 32 KV

C) Between Phases i Dry KV 28 KV

ii Wet KV 28 KV



6 Impulse withstand test voltage of completely

assembled switch without arcing horns with

1.2/50 micro second impulse wave KV (Peak)

85 KV

7 100% impulse flashover voltage of completely

assembled switch with arcing horns with

1.2/50 micro second impulse wave KV (Peak)

85 KV

8 Particulars of the main contacts i.e. fixed

contacts and moving contacts

a Type Spring loaded fixed &

knife type moving

contacts

b Material Hard drawn electrolytic

copper alloy

c Surface Treatment & Thickness of Silver

Coating Silver plated of thickness

of 5 micron

d Contact Pressure 25 KG 9 Continuous Current Rating, Amps 400 amps

10 Short Time Current Rating KA (rms) min. for

1 sec

16 KA

11 Rated Peak Short Circuit Current (KA Peak) 25 KA 12 No. of operations which the switch can

withstand without deterioration of contacts

2000

13 Type of Mounting Horizontal up right

mounting

14 Type & Material used in connector Brass/ Bronze strips 15 Location and Type of Bushing Bush bearing at rotating

insulator

16 Particulars of Post Insulators

i Make( ISI make) To be indicated

ii Type 11 KV Post insulator

type

iii Strength 10 KN

iv Weight 5 Kg (approx.) / unit

v No. of units per stack One

vi Height of stack mm 254 mm

viii Creepage distance mm 320 mm

ix One Minute Power Frequency Dry withstand

voltage KV (rms)

65 KV

x Power Frequency Flashover voltage KV (rms) 70 KV

xi Impulse flashover voltage KV (Peak) 85 KV

xii Impulse withstand voltage KV (Peak) 80 KV (peak)

xiii Puncture voltage (KV) 105 KV





Section-VIII

Proposed Route Map

Proposed 11kV UG Cable From Sishubawan 33/11kV S/S to Ayakar Bhawan near Shelter Chhaka

Shelter

Chhaka Proposed 11kV

XLPE UG Cable

Ayakar

Bhawan

Sishubhawan

33/11kV Sub-Station

CDA

Chhaka

Corporate

Bhawan Ram

ABIT Mandir

College Kathajodi River

Bidanasi

220/132/33kV

Grid S/S

Proposed 11kV UG Cable From Sishubawan

33/11kV S/S to

Ayakar Bhawan near Shelter Chhaka

DWG No: - 01

Client CENTRAL ELECTRICITY SUPPLY UTILITY OF ORISSA

Regd. Office: 2nd Floor, IDCO TOWER

Janpath, Bhubaneswar -751022

