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Technical Specification of Electrical Materials
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.
TECHNICAL SPECIFICATION
OF
ELECTRICAL MATERIALS
(AB SWITCH, HG FUSE AND DO FUSE)
GROUP I & J
Details of require materials:
Sl No Item Description Unit Quantity
1 3 Pole 11kv 200A A B Switch (H) Set 1954
2 3 Pole 11kv 200A H.G. Fuse Set 1829
3 2 Pole 11kv 200A A B Switch (H) Set 250
4 2 Pole 11kv 200A H.G. Fuse Set 250
5 3 Pole 11kv 400A A B Switch (H) Set 250
6 3 Pole 11kv 200A DO Fuse Set 625
7 2 Pole 11kv 200A DO Fuse Set 625
8 3 Pole 33kv 200A A B Switch (H) Set 150
9 3 Pole 33kv 200A H.G. Fuse Set 150
10 3 Pole 33kv 400A A B Switch (H) Set 150
11 3 Pole 33kv 400A H.G. Fuse Set 150
NB: 1. Bidders should put their authorized signature with office seal on each page of
the documents.
2. Bidders should put their offer in the Guaranteed particulars column furnished
in the tender documents.
3. Purchaser may ask to the bidder who will qualify in Techno- Commercial
evaluation of the tenders for submission of Samples for verification , if
required.
4. Purchaser reserves the right to increase or decrease the above quantities
during placement of purchase order or may cancel any item/items without
assigning any reason thereof . Dy. General Manager (C&P) NESCO, Balasore, Odisha
11 KV 200 Amp 3 Pole AB Switch
Technical Specification 01.0 Scope: -
This specification covers manufacturing testing and supply of 11KV 200 Amps 50HZ Air Break switches for outdoor installation in horizontal configuration. The switches are suitable for operation under off load conditions only and are intended for use on Distribution Sub stations and tapping sectionalizing points of 11 KV lines.
02.0 Description of the materials: -
The 11KV A.B. Switch sets shall confirm to the following parameters: -
a. Number of poles 3 b. Number of Post insulator per pole 2nos12KVpostinsulator. c. Nominal system voltage 11KV d. Highest system voltage 12KV e. Rated frequency 50Hz f. System earthling effectively earthed. g. Rated nominal current 200 amps h. Altitude of installation Not exceeding1000M
The post insulators used in the A.B. Switches shall have the following ratings :-
a. Power frequency withstand voltage (dry) 35KV (RMS) b. Power frequency withstand voltage(wet) 35KV (RMS) c. Implies withstand voltage(dry) 75KV d. Power frequency puncture withstand 1.3
03.0 Standards: -
The AB Switch Set shall conform to the following standards: -
a. IS-9920 (Part-I to V) b. IS-2544/1973 (for porcelain post insulators) c. IS-2633, (for galvanization of ferrous parts.) or its latest amendments if any.
04.0 Insulator make: -
12KV post insulators complete with post and cap duly cemented to be used in the AB Switch Set conforming to IS-2544/1973.
The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference and scrutiny.
The bidder shall mention make, type of insulation materials, metal fittings, Creepage distance, protected Creepage distance, tensile Strength, compressing strength, torsion strength and cantilever strength.
05.0 Climatic condition: -
The A.B. Switch set shall be suitable for operation under the following climatic conditions.
a. Maximum ambient air temperature 45 o C
b. Maximum daily average air temperature 35 o C
c. Maximum yearly average ambient air temperature 30 o C d. Maximum temperature attainably by a body e. Exposed to the Sum. 50 o C
f. Minimum ambient air temperature 0 o C
g. Maximum relative humidity 100% h. Minimum number of rainy days per annum 70 i. Average number of rainy days per annum 120 j. Average annual rain fall 150cm. k. Number of months of tropical monsoon conditions 4 l. Maximum wind pressure 260Kg./mm2 m. Degree of exposure to atmospheric pollution normally n. Atmosphere. Polluted.
06.0 Other technical details: -
06.01 General: - The 11KV A.B. Switch Set shall be the gang operated rotating single air
break type having 2 post insulators per phase. The operating mechanism shall be suitable for manual operation from the ground level and shall be so designed that all the three phases shall open or close simultaneously. The Switches shall be robust in construction, easy in operation and shall be protected against over travel or staining that might adversely affect any of its parts. The required base M.S. Channel (hot dip galvanized) phase coupling rod, operation rod with intermediate guide braided with flexible electrolytic copper, tail piece of required current carrying capacity and operation mechanism with ON & OFF positions shall be provided. The operation rod shall be medium gage of 32mm diameter nominal bore G.I. pipe single length 6 meters. The phase coupling rod for gang operation shall be of medium gauge 25mm dia &2100 mm length nominal bore G.I. pipe. The Rating post insulators shall be provide with suitable bearing mounted on a base channel with 8mm dia thrust collar and 6mm split pin made out of stainless steel. The operating down rod shall be coupled to the spindle (minimum dia 32mm) for gang operation through another suitable bearing by two numbers 10mm dia stainless steel bolts with double nuts. All the bearings shall be provided with grease nipple. All metal (ferrous) parts shall be galvanized an polished. The pipe shall be galvanized in accordance with IS-4736/1968.The post insulators should be fixed with the base channel using Galvanized Nuts and Bolts.
06.02. Mounting:- The A.B. Switches shall be suitable for horizontal mounting in double pole sub-station structures. MS Galvanized base Channel & base support channel should be of min. size 75x40x6 mm.
06.03. Switching Blades: - It shall be made out of electricity copper with silver plated.
The approximate size shall be 220mm X 35X 6mm. The Switch shall have such a spring mechanism so as to ensure that the speed of the opening of contact is independent of speed of manual operation.
06.04 Fixed Contacts: - The Fixed Jaw type female contacts o f s ize (70x35x6) mm shall be made of electrolytic copper (minimum 95% copper composition) duly silver coated controlled by phosphorous bronze high pressure spring housed in robust G.I. Cover. It is essential that provision shall be made in fixed female contracts to take the shock arising from the closing of move contract blade without the same being transmitted to the post insulator. The arrangement made in this regard shall be specifically shown in the drawing.
06.05 Arcing Horn: - As the switches are generally meant for isolating transmission line
and distribution transformers, suitable arcing horns shall be provided for breaking the charging current horn shall be made of 8 mm dia G.I. Rod with spring assisted operation.
06.06 Terminal Connectors: - Terminal connectors shall be robust in design. The size of
fixed connector shall be (65 X 35 X 6 mm) and size of movable connector shall be of (65 X 35) X (65 X 35) X 6mm of copper casting with uniform machine finishing duly silver plated made out of minimum 95% copper composition with 2 nos. 12mm dia holes provided with suitable brass bolts and double nuts, flat washers & 2nos.
bimetallic solder less sockets suitable up to 55 mm2 conductor. 06.07Spacing: - The minimum clearance between phases to the switch shall be
760mm. The operation down rod shall be at a transverse distance of 300mm from the outer limb of the switch. The centre spacing between two post insulators of the same phase shall be 380 mm. In the open position of the A.B. switches the moving blade shall rotate through 90 o. This shall be exhibited in the drawing.
06.08 Sample, Drawing & Literatures: - Three copies of drawings of 11KV 200 Amps. A.B. Switch shall be furnished along with the tender. Technically successful bidder is to be asked for submission of Sample for verification.
06.09 The details of construction and materials of different parts of the A.B. Switch shall clearly
be indicate in the tender and illustrative pamphlet / literature for the same shall be submitted along with the tender.
07.0 TEST & TEST CERTIFICATE: -
07.01 Type Test: - Certificate for the following type tests conducted on a prototype set of A.B.
Switch in a NABL approved test house/CPRI shall have to be submitted along with offer.
Dielectric Test (impulse and one minute were power frequency withstand voltage test.)
Temperature rise test (for contracts and terminals)
Shorts Time current and peak withstand current test.
Mainly active load breaking capacity test.
Transformer off-load breaking capacity test.
Line charging breaking capacity test.
Cable charging breaking test.
Operation and mechanical endurance test.
Mechanical strength test for post insulator, as per IS-2444/1937 shall be furnished.
Test for galvanization of metal (ferrous) parts.
07.02 Routine /Acceptance Test: -
The inspection may be carried out by the Purchaser at any stage of manufacture. The successful bidder shall grant free access to the Purchasers representative at a
reasonable time when the work is in progress. The following routine tests shall have to be conducted on each set and results are to be furnished for consideration of deputing inspecting officer for inspection and conduction testing of the materials at the works of the manufacturer. the supplier shall give fifteen days advance intimation to the Purchaser to enable him to depute his representative for witnessing the tests.
1. Power frequency voltage dry test. 2. Measurement of resistance of main circuit. 3. Tests to prove satisfactory operation. 4. Dimension Check 5. Galvanization test. 6. Operational test.
08.00 Guaranteed Technical Particulars: -
The bidder shall furnish the guaranteed technical particular duly filled in the format along with the tender.
09.0 Completeness of Equipment: -
All fittings, accessories of apparatus which may not have been specifically mentioned in this specification but which are usual or necessary in equipment of similar plat shall be deemed to be included in the specification and shall be supplied by the Tender without extra charge. All plant and equipment shall be completed in all details whether such details are mentioned in the specification or not.
11 KV 200 Amp 2 / 3 Pole AB Switch
Guaranteed Technical Particulars
Sl. No
Particulars
Requirement
Bidders offer
2 pole 3 pole
1 Makers name & Address To be specified by the bidder
2 Type of Switch Rotating Type
3 Suitable for mounting Horizontal only
4 No. of Breakers per phase Single Break
5 No. of Post Insulators per
phase
2nos. of 12KV Post Insulators as per
IS:2544/73 per phase
6
(a)
Post Insulators
Makers Name &
Country of Manufacture of
Post Insulator
To be specified by the bidder as per CPRI Test Report
(b) Type of cementing Original Cementing. The insulator to
be cemented with MCI (Hot dip
galvanised /Al Alloy cap and
MCI/Forged steel hot deep
galvanized pedestral) as per IS:
2544/1973
(c) Power frequency withstand
voltage (Dry)
35 KV RMS
(d) One minute Power
frequency withstand
voltage (wet)
35 KV RMS
(e) Visible discharge voltage 9KV RMS
(f) Dry flash over voltage 85 KV
(g) Power frequency puncture
withstand voltage
1.3 times of actual dry flash over voltage
(h) Creapage distance 320 mm minimum (ISS-2544/1973 & relevant IEC)
(7) Impulse withstand
voltage for positive &
negative polarity
(1.2/50 micro second wave)
(a) Across the isolating distance
85KV Peak
(b) To earth & between poles 75KV Peak
8 Rated one minute
Power frequency
withstand voltage
(a) Across the Isolating
distance
32KV(RMS)
(b) To earth & between poles 28KV(RMS)
9(a) Rated voltage nominal/
maximum
11/12KV
(b) Rated normal current and
rated frequency
200 Amps. 50hz
10 Rated short-circuit
making capacity
25KA (Peak)
11 Rated Short-time current 10KA
12 Rated peak withstand current 40KA
13 Rated mainly active load
breaking capacity
200 Amp.(RMS)
14 Rated Transformer off load
breaking capacity
6.3 Amp.(RMS)
15 Rated line charging breaking
capacity
2.5 Amp(RMS)
16 Minimum clearance
between adjacent phase
(a) Switch closed (center to
center)
760mm
(b) Switch opened (Center of
post insulator to the edge
of the blade)
380mm
17 Temperature rise The
Temperature rise should
not exceed the maximum
limit to 65o
C at an ambient
temperature not
exceeding 40oC
650C
Copper contacts silver faced
terminal of switch intended to
be conducted to external
conductor by bolts or screws
at an ambient temperature
should not exceed.
50o
C
18 Vertical clearance from
top of insulator cap to
mounting channel.
254 mm
19 Type of contact a) Self aligned high pressure jaw type fixed contacts of electrolytic copper of size
70 mm x 35mm x 6 mm duly
silver plated .Each contact
should be riveted with three
nos. copper rivets with a bunch
( minimum 3 mm thick) of
copper strips /foil each may
vary from 0.15 mm to 0.25 mm
to and total thickness of copper
foil per jaw should be 6 mm .
Jaw assembles are to be bolted
through brass bolts and nuts
with spring washer.
b) Solid rectangular blade type
moving contact of electrolytic
copper of size 35 mm X 6 mm
and length 220 mm duly silver
plated ensuring a minimum
deposit of silver 10 micron on
copper contacts or as may be
prescribed under relevant ISS /
IEC .
c) Pressure springs are to be used
in each jaw contacts should be
phosphorous bronze having
8nos. of turns X28mm heights X14.4mm diameter with 14
SWG wire .
17 Connectors:- Terminal connectors for both
movable and fixed should be of
copper flat of same size similar to
that of moving contact blades
(minimum 95% copper
composition). The fixed connector
shall of size 65 mm x 35 mm x 6 mm
and the size of movable connector
shall be size (65 X 35) X (65 X
35) X 6mm with machine finishing
duly silver plated with 2 nos. 12mm
dia holes provided with suitable
brass bolts and double nuts, flat
washers & 2nos. bimetallic solder
less sockets suitable upto 55 mm
conductor.
18 Moving contact supporting
angle
Moving contact is to be supported by G.I angle of size 45x45x5 mm on each phase and the moving contact are to be bolted through 2 nos. stainless steel bolts and nuts with suitable stainless steel flat and spring washers.
19 Galvanization
a) Iron parts shall be hot dip
galvanized as per IS-
2633/1972.(Latest Amendment) ,
IS :2629/1985 (1st
. Revision),
b) The pipe shall be galvanized as
per IS-4736/1968.(Latest
Amendment)
20 (a)
Phase Coupling Rod 25mm nominal bore G.I. Pipe (Medium gause)
(b) Operating Rod ISI mark 32mm nominal bore G.I. Pipe (Medium gause) 6 mtr. long
Normal Outside Dia. in
mm
Wall
thickness
Max. Min.
25 mm 34.2 33.3 3.25 32 mm 49.9 42 3.25
(c) Arcing Horn 8 mm dia G.I. rod with spring assisted operation.
(d) Force of fixed contact spring 50lbs to 75 lbs
(f) Bearings 4 nos. self lubricated bearing to be provided with grease nipple including 4th bearing being a axial thrust bearing.
(g) Locking Arrangement Pad Lock and key arrangement at both ON & OFF position..
(h) Earth terminal Provided at base channel at opposite ends.
(i) Copper braided flexible tapes
320mm long 2no. tin coated
copper braided flexible tape
both end seated with cupper
sheets duly punched for
fixing having minimum
weight of 450 grams per
meter without sockets.
(j) Quick break device Lever mechanism
(k) T connector The T connector provided on the channel having Moving
Contact shall be of G.I Nut &
Bolt at the bottom end to
facilitate replacement of this unit
only during requirement and
avoid entire change of the arm.
l) I-Bolt The I-Bolt shall be longer with 75 mm thread.
21 Supporting Channel 75mmx40mmx 6mm M.S.Channel. (Hot dip galvanized)
22 Weight of each pole 20 Kg (Approximately) ( to be specified by bidder)
23 Detailed drawing submitted ? To be provided by bidders
N.B i) Ferrous parts shall be duly galvanized as per IS :2629/1985 (1st
. Revision),
(Amendment-2) and non-ferrous parts shall be silver plated.
ii) The G.I pipes and rods shall be galvanized as per IS:4736/1968 (1st
. Revision),
(Amendment-1) for hot-dipped zinc coating on M.S. Tube.
iii) Certificate from a Government approved laboratory regarding composition of copper in
electrolytic copper casting of materials should be submitted during inspection of materials at the
cost of tenderer.
iv) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control
& testing of materials shall be governed by the relevant IS with latest Amendment.
11 KV 200 Amp 3 Pole HG Fuse
Technical Specifications
1. SCOPE:- This specification covers the manufacture, testing and supply of 11 3 pole 200A H.G. Fuse Sets.
2. (a) The 11 KV H.G. Fuses shall be suitable for out door operation in
horizontal configuration under the climatic conditions specified. It shall be of
the following ratings:-
1 Number of Poles 3 2 No.of Insulator per Pole 2 nos. 12 KV post Insulators 3 Nominal system Voltage 11 KV 4 Highest System of Voltage 12 KV 5 Rated frequency 50 Hz 6 System Frequency Effectively earthed 7 Rated normal current 200 Amps 8 Altitudes of installation Not exceeding 1000 M.
(b) The post insulator used in the H.G. Fuse set shall have the following ratings :-
1 Power frequency withstand voltage (dry) 33 KV (RMS) 2 Power frequency withstand voltage (wet) 35 KV (RMS) 3 Impulse withstand voltage (dry) 75 KV (Peak) 4 Power frequency withstand voltage 1.3 times the actual dry
flashover voltage of the unit
3. STANDARDS :-
The H.G. Fuse set shall confirm to the following standards.
IS- 9385-1980 ( for high voltage expulsion fuses and similar fuses).
IS- 2544-1973 ( for porecelain post insulators or its latest amendments if any.). IS-
2633-1979 ( for Galvanisation of ferrous parts).
4. INSULATOR MAKE :- 12 KV post insulator complete with pedestal cap
duly cemented to be used in 11 KV H.G. Fuse sets confirming to IS-2544/1973.
5. TECHNICAL DETAILS :- The H.G. Fuses shall have adjustable arcing
horns made of solid copper rod having 7.62 mm dia. The horns shall be
fitted with screwing devices with flynuts for fixing and tightening the fuse
wire. It shall have robust terminal connectors of size 80 mm x 50 mm x 6 mm
made of copper casting (95 % minimum copper composition) duly silver plated
with two numbers of 12 mm dia brass bolts and double nuts with flat
brass washers. The connectors should be capable of connecting crimpable
conductor upto 80 Sq. mm size( ACSR/ Alloy) with bimetallic solderless
sockets. The H.G Fuse Set shall suitable for horizontal mounting on sub-
station structures. The minimum clearance between the adjacent phases of the
fuse set shall be 760 mm and the centre to centre (distance between two post
insulators of the same phase) shall be 410 mm. All metal (ferrous) parts shall be
galvanized and polished. Only 12 KV post insulator ( orginal cemented and not
pin insulators shall be used for the H.G. Fuse Set.
6. CLIMATIC CONDITIONS :- The H.G. fuse set shall be suitable for
operation under the following climatic conditions.:-
1 Maximum ambient air temperature 450 C 2 Maximum daily average air temperature 350 C
3
Maximum yearly average ambient air temperature
300 C 4 Maximum temperature attainable by a body
exposed to the sun. 500 C
5 Minimum ambient air temperature 00 C 6 Maximum relative humidity 100% 7 Average number of thunderstorm days per annum 70 days 8 Average number of rainy days per annum 120 9 Average annual rain fall. 150CM 10 Number of months of tropical monsoon conditions 4 11 Maximum wind pressure 260 Kg/mm 12 Degree of exposure to atmospheric pollution. Normally polluted
atmosphere.
7 Type Test :-
Certificate for the following type tests conducted on a prototype set of HG Fuse in a NABL approved test house/CPRI shall have to be submitted along with offer.
i) Dielectric test (impulse & one minute wet power frequency withstand voltage test.)
ii) Temperature rise test ( for terminals) iii) Mechanical strength test for the post of insulator as per IS-2544/1973 iv) Test for galvanization of metal (ferrous) parts.
8. ROUTINE/ACEPTANCE TESTS :-
The inspection may be carried out by the Purchaser at any stage of manufacture.
The successful bidder shall grant free access to the Purchasers
representative at a reasonable time when the work is in progress. The following
routine tests shall have to be conducted on each set and results are to be
furnished for consideration of deputing inspecting officer for inspection and
conduction testing of the materials at the works of the manufacturer. the
supplier shall give fifteen days advance intimation to the
Purchaser to enable him to depute his representative for
witnessing the tests.
i) Power frequency voltage dry test
ii) Dimension Check
iii) Galvanisation test.
9. Guaranteed Technical Particulars :
The bidders are required to furnish the guaranteed technical particulars duly filed in
the proforma along with the bid.
10. Completeness of Equipment :
Any fittings accessories or apparatus which may not have been
specifically mentioned in this specification but which are usually necessary in
equipment of similar plant shall be deemed to be included in the
specification and shall be supplied by the bidder without extra
charge. All plant and equipment shall be complete in all details whether such
details are mentioned in the specification or not.
11. Inspection :
Routine and acceptance test shall be conducted at the place of manufacturer.
The bidders are requested to furnish details of equipments which will be used
for testing along with the bid. The bids of these manufacturers who do not
have adequate testing facilities for conducting routine and acceptance test are
liable for cancellation. The successful bidder has to furnish routine test certificate
and guarantee certificate for each consignment of materials to be inspected at
the time of offer of materials for inspection.
GUARANTEED TECHNICAL PARTICULARS OF 11 KV 200Amp.
HG Fuse ( 2 / 3 pole)
Sl.
No
Particulars
Requirement
Bidders offer
11 KV 200 Amps.2/ 3 pole H.G
Fuse.
2 Pole 3 Pole
1 Makers name & Address To be specified by the bidder
2 Operating voltage 11 KV
3 No. of Post Insulators per phase
2 nos. of 12 KV Post Insulators per
phase as per ISS:2544/1973
4 Rated normal current &
normal frequency
200 Amp., 50 Hz
5 Vertical clearance from the top of insulator to
mounting channel
254 mm (minimum)
6 Height of the riser for carrying the horn.
150 mm from the cap top of
insulator
7
(a)
Post Insulators :
Makers Name & Country of Manufacture of Post Insulator
To be specified by the bidder ( as per
CPRI Test Report).
(b) Type of cementing Original Cementing only as per IS:
2544/1973 & relevant IEC.
(c) 1 minute Power
frequency withstand
voltage (Dry)
35KV RMS
(d) 1 minute Power
frequency withstand
voltage (wet)
35KV RMS
(e) Visible discharge voltage 9KV RMS
(f) Dry flash over voltage 85 KV RMS
(g) Power frequency puncture withstand voltage
1.3 times of actual dry flash over
voltage (110 KV) .
(h) Creapage distance 320 mm (minimum). Actual
creepage distance for which type
test has been conducted is to be
supplied.
8. Impulse withstand voltage for positive & negative polarity
(1.2/50 micro second wave)
(a) Across the isolating distance 85KV (Peak)
(b) To earth & between poles 75KV (Peak)
9. One minute Power frequency withstand voltage
(a) Across the Isolating distance 32KV(RMS)
(b) To earth & between poles 28KV(RMS)
10 Details of Arcing Horn 1 SWG (7.62 mm) dia. solid copper rod silver plated provided with screwing
arrangement on the fuse carrier made of
copper casting for fixing fuse wire (Total
length -635 mm). All the bolts, Nuts and
washers should be made out of Brass.
11 Riser Unit (150 mm height total)
a) Riser cum Connector made out of
copper casting (with minimum 95%
copper composition having riser size (80
mm height x30mm width x8 mm
thickness) and connector of size (80
mmx50mmx 8mm) duly silver plated
and machine finishing provided with 2
nios.12 mm dia. brass bolts and double
brass nuts with flat brass washers and 2
nos. solderless bimetallic socket per each
connector suitable upto 80
mmconductor.
b) 100 mm height G.I Riser made of 19 mm nominal bore medium gauge G.I
pipe welded with 2 nos. of G.I flat of
30mmx5mm of both ends fixed with
10mm dia. stainless steel bolts and nuts
with flat & stainless steel spring washer.
13. Galvanization a) All ferrous parts shall be hot-
dipped Galvanized as per
IS.2633/1972 (Latest Amendment) , IS
:2629/1985 (1st
. Revision),& all non-
ferrous parts shouldbe duly electroplated
with silver.
14 Supporting Channel 75mmx40mmx6mm M.S.Channel. (Hot dip galvanized)
15 Weight of each pole 16 Kg (Approx.)To be specified by the Bidder
16 Detailed drawing submitted ? To be provided by bidders
N.B i) Ferrous parts shall be duly galvanized as per IS :2629/1985(1st. Revision),
(Amendment-2) and non-ferrous parts shall be silver plated.
ii) Certificate from a Government approved laboratory(NABL accredited) regarding composition of copper in electrolytic copper casting of materials should be submitted during
inspection of materials at the cost of Bidder.
iii) Type Test Certificate : The type test certificate , conducted within five years , preceding to date of opening of the tender from Govt. testing laboratory (NABL accredited / CPRI) shall be
furnished.
33KV 3 Pole 200 Amp AB Switch (Horizontal Type)
Type Test: - Certificate for the following type tests conducted (within five years proceeding to the date of opening of the tender)on a prototype set of A.B. Switch in a NABL approved test house/CPRI shall have to be submitted along with offer
GUARANTEED TECHNICAL PARTICULARS Slno. Description Specified Bidders
Offer
1 Maker's name and Country of origin. 2 Type of Switches Rotating type only. 3 Suitable for mounting. Horizontal only.
4 Number of support post Insulator per phase
4 Nos. 22 Kv/24 Kv post Insulators per phase as per IS : 2544/1973.
5 POST INSULATOR
(a) Maker's name and Country of origin. Reputed make. All the post insulators provided shall be of same make.
(b) Type of Cementing. Original Cementing only.
(c) One minute power frequency withstand voltage dry.
95 Kv (rms)
(d) One minute power frequency withstand voltage wet.
75 Kv (rms)
(e) Visible Discharge voltage. 27 Kv (rms)
(f) Dry flash over voltage. 95 Kv.
(g) Power frequency puncture withstand voltage.
1.3 times of actual dry flash over voltage.
(h) Impulse withstand voltage (Switch in position)
170 Kv (Peak)
(i) Creepage distance. 430 mm. However, t he actual creepage d i s t a n c e f o r which type test has been conducted is to be supplied.
6 Impulse withstand voltage for positive & negative polarity (1.2/50 micro second wave)
(a) Across the Isolating distance. 195 Kv (Peak) (b) To earth and between polles 170 Kv (Peak)
7 Rated one minute power frequency withstand Voltage.
(a) Across the Isolating distance. 80 Kv (rms) (b) To earth and between polles 70 Kv (rms)
8 Rated normal current and rated frequency.
400 Amps. 50 Hz.
9 Rated short time current. 16 KA (rms) 10 Rated peak withstand current. 40 KA (Peak) 11 Rated transformer off load breaking
capacity. 6.3 A (rms)
12 Rated line charging breaking capacity. 6.3 A (rms) 13 Rated cable charging breaking capacity. 16 A (rms) 14 Minimum clearance between adjacent
phases.
(a) Switch closed (Centre to Centre) 1200 mm
(b) Switch opened (Centre of post Insulator to the edge of the blade)
640 mm
15 TEMPERATURE RISE.
The temperatyure rise should not exceed to 650C
maximum limit as specified below at an
ambient temperature not exceeding
400C.
Copper contacts silver faced terminal of switch intended to be conducted to external
conductor by bolts or screws at an
ambient temperature should not exceed
500C
16 Vertical clearance from the top of
Insulator cap to mounting channel
508 mm. Minimum.
17
Type of Contact
(a) Self-aligned, high pressure jaw type fix contacts
of electrolytic copper of size 80 x 50 x 8 mm duely
silver plated. Each contact should be rivetted with
three nos. copper rivets with a bunch ( minimum
3 mm thick) consisting of copper foils may vary
from 0.15 mm to 0.25 mm ( total thickness of
copper foil per jaw shallbe 6 mm). Jaw assembles
are to be bolted through brass bolts and nuts
with brass flat and spring washer.
(b) Solid rectangular blade type moving contact
of electrolytic copper size 220 mm x 50 mm x 8
mm duly silver plated.
(c ) Pressure springs to be used in Jaw contacts should be phosphorous bronze having 8 nos. of turns x 28 mm height x 14.4 mm dia. With 14 SWG wire (Minimum 6 nos. spring shall be used)
18
Terminal Connector.
Terminal connector for both movable and fixed should be of copper casting (minimum 95 % copper composition). The fixed connector shall be of size (80 x 50) x 8 mm and the size of the movable connector (80 x 50) x (80 x 50) x 8mm with machine finishing duely silver plated with 2 nos. 12mm dia. hole with suitable brass bolts and double nuts with brass flat washers and 2 nos. solerless bimettalic sockets per each connector suitable upto 80 mm2 conductor. The sockets shall be preferably of "USHA MARTIN" make.
19
Moving Contact supporting angle.
Movable contact is to be supported by G.I Angle of size 50 x 50 x5mm on each phase and the moving contact are to be bolted through 2 nos. stainless flat and spring washers suitably.
20 Galvanisation (a) Iron parts shall be hot-dipped galvanised as per IS :2629/1985 (1 st Revision), (Amendment-2).
(b) The G.I Pipe shall be galvanised as per IS :
4736/1968 (1 st Revision),(Amendment-1) for
Hot-dipped Zinc Coating on M.S Tubes.
21 Details of phase
(a) Coupling Rod. 25mm nominal bore G.I Pipe medium gauge.
(b) Operating Rod.
32mm nominal bore G.I Pipe medium gauge. Single length 6 mtrs. The detail dimensions of
the G.I Pipe as mentioned below :
Nominal Outside Diameter Wall thickness
Max. Min.
25mm 34.2mm 33.3mm 3.25mm
32mm 42.9mm 42mm 3.25mm
(c ) Arcing Horn. (a) 8mm dia G.I Rod with spring-assisted operation.
(d) Bearing System. One bearing shall be provided near the
Base Channel to assist in operatio.
(e) Force of fixed contact spring. 50-75 lb.
(f) Copper braided flexible tapes.
320mm length of flexible electrolytic copper tape or braided chordwith tin coated having minimum weight 450 gms/mtr. And both ends shall be cripped with copper sockets through brass bolts and nuts with brass flat washers. Two nos. of suitable copper sockets shall be used at both ends. The socket should be preferably of "DOWEL" make(catalogue o CUS/48) or equivalent USHA MARTIN make. The minimum no. of flexible wires should be 1536 of 36 SWG for each flexible chord.
(g) Quick break Device. Lever Mechanism.
(h) Bearings. 4 nos. self lubricating bearings to be provided with grease nipple including 4th bearing being a thrust bearing.
(i) Locking Arrangement. Pad locker and key arrangement at both "ON" and "OFF" position.
(j) Earth Terminal. To be provided at base channel.
(k) 'T' Connection.
The 'T' Connection provided on the channel having 'MovingContact' shall be of G.I Nut & Bolt at the bottom end to facilitate replacement of this unit only during requirement & avoid entire change of the arm.
(l) The 'I-Bolt' shall be longer with 75 mm thread. 22 Supporting Channel. 75 x 40 X6 mm M.S Channel hot-dipped galvanised. 23 Weight of each pole complete. 50 Kgs. Approximately.
N.B I) Ferrous parts shall be duly galvanised as per IS:2629/1985 (1 st Revision), (Amendment-2) and non-ferrous
II) The G.I Pipes & Rods shall be galvanised as per IS : 4736/1968 (1 st Revision),(Amendment-1) for Hot- dipped Zinc Coating on M.S Tubes.
III) Certificate from a Government approved laboratory regarding composition of copper in electrolytic copper
IV) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control & testing of
materials shall be governed by the relevant IS with latest Amendments.
V) Type Test report from CPRI or accredited NABL laboratory should be furnished. Same for insulators is to
also to be provided.
TECHNICAL SPECIFICATION OF 33 KV & 11KV 3 Pole, 400
AMP , HORIZONTAL TYPE AB SWITCH
TECHNICAL SPECIFICATIONS FOR AB SWITCH
1. SCOPE:- This specification covers manufacturing testing and supply of 3 Pole, 400 AMP, 50 Hz, Single break, 33 KV & 11 KV class Air Break switches for outdoor installations to be used at 33/11 KV Sub-stations and for incoming & outgoing Lines suitable for operation under off load conditions.
1.1 DESCRIPTION OF THE MATERIALS:-The A.B. Switch sets shall confirm to the following parameters:-
Sl.
No.
Description
Parameters of AB Switch
33 KV
11 KV
i)
Number of poles
3 ii) Number of Post insulator per pole 4 nos. 22/24 KV class 2 nos. 12 KV class
iii)
Nominal system voltage (KV)
33
11
iv)
Highest System Voltage (KV)
36
12
v)
Rated frequency
50HZ
vI)
System earthing
Effectively earthed.
vII)
Rated nominal current Amp.
400 400
viii)
Altitude of installation
Not exceeding 1000 M
The post insulators used in the A.B. Switches shall have the following ratings
Sl.
No.
Description
Parameters P.I. of AB Switches for
33 KV 11 KV
i)
Power frequency withstand voltage
(dry) KV (RMS)
95
35
ii) Power frequency withstand voltage 75 35
(wet) KV (RMS)
iii
Impulse withstand voltage (dry) KV
(Peak)
170
75
iv)
Power frequency puncture
withstand voltage
1.3 times the actual dry flashover voltage of
the unit
1.2 STANDARDS:- The AB Switch Set shall conform to the following standards:-
i) IS-9920 (Part-I to V.)
ii) IS-2544/1973 ( for porcelain post insulators)
iii) Is-2633 (for galvanization of ferrous parts.) or its latest amendments if any.
1.3 INSULATORS:-
12 KV class (for 11 KV AB Switches) and 22 KV / 24 KV class (for 33 KV AB Switches) Post Insulators complete with pedestal cap duly cemented to be used in the AB Switch Set conforming to IS-2544/1973
The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference.
The bidder shall mention make, type of insulation materials, metal fittings, Creep age distance, protected Creep age distance, tensile strength, compression strength, torsion strength and cantilever strength.
1.4 CLIMATIC CONDITIONS:-
The A.B. Switch set shall be suitable for operation under the following climatic
1.
conditions
Maximum ambient air temperature.
45 0 C
2. Maximum daily average air temperature 35 0 C
3. Maximum yearly average ambient air temperature 30 0 C
4. Maximum temperature attainable by a body exposed to the sun.
50 0 C
5. Minimum ambient air temperature 0 0 C
6. Maximum relative humidity. 100%
7. Minimum number of rainy days per annum 70
8. Average number of rainy days per annum 120
9. Average annual rain fall. 150 cm.
10. Number of months of tropical monsoon conditions 4
11. Maximum wind pressure. 260 Kg./ mm2
12. Degree of exposure to atmospheric pollution. Normally polluted atmosphere.
1.5 TECHNICAL DETAILS:-
1.5.1 The 33 KV A.B. Switch Set shall be gang operated (with double tandem pipe) single air break
outdoor type horizontal mounting having 4 nos. 22/24 KV post insulator per phase and the 11
KV A.B. Switch Set shall be gang operated single (with double tandem pipe) air break outdoor
type horizontal mounting having 2 nos. 12 KV post insulator per phase. The operating
mechanism shall be suitable for manual operation from the ground level and shall be so
designed that all the three phases shall open or close simultaneously. The Switches shall be
robust in construction, easy in operation and shall be protected against over travel or straining
that might adversely affect any of its parts. The required base M.S. Channel, phase coupling
rod, operating rod with intermediate guide braided with flexible electrolytic copper, tail
piece of required current carrying capacity and operating mechanism with O & OFF
positions shall be provided. The operating rod shall be medium gauge of 32mm diameter
nominal bore G.I. pipe single piece 6 meters. The phase coupling rod for gang operation shall
medium gauge 25mm dia nominal bore G.I. Pipe. Rotating post insulators shall be provided
with suitable bearing mounted on a base channel with 6 mm thick thrust collar and 6mm split
pin made out of stainless steel. The operating down rod shall be coupled to the spindle
(minimum dia - 32mm) for gang operation through another suitable bearing by two numbers
10mm dia through stainless steel bolts with double nuts. The post insulators should be fixed
with the base channel using Galvanized Nuts and Bolts.
All the bearings shall be provided with grease nipple. All ferrous parts shall be galvanized and
polished. The pipes shall be galvanized in accordance with IS-4736/1968.
1.5.2 Mounting: - The A.B. Switches shall be suitable for horizontal mounting in all type of sub-
station structures.
1.5.3 Switching Blades: - It shall be made out of electrolytic copper with silver plated. The
approximate size shall be 250mm x 50 x 8mm for 11 KV. The switch shall have such a spring
mechanism so as to ensure that the speed of the opening of contact is independent of speed of
manual operation
1.5.4 Fixed Contracts:- The fixed jaw type female contracts (50x8x95 )mm for 11 KV shall be made
of electrolytic copper ( minimum 95 % copper composition) duly electroplated controlled by
Phosphor bronze high pressure spring housed in robust G.I. Cover.
It is essential that provision shall be made in fixed female contracts to take the shock arising
from the closing of moving contract blade without the same being transmitted to the post
insulator. The arrangement made in this regard shall be specifically shown in the drawing.
1.5.5 Arcing Horn:- As the switches are generally meant for isolating transmission line and
distribution transformers, suitable arcing horns shall be provided for breaking the
charging current horn shall be made of 10 mm dia G.I. Rod with spring assisted
operation.
1.5.6 Terminal Connectors:- Terminal connectors shall be robust in design. The size of fixed
connector shall be ( 80 x 50 x8 mm) and size of movable connector shall be of ( 80 x50) x (
80 x 50) x 8 mm of copper casting with uniform machine finishing duly silver plated made
out of minimum 95 % copper composition with 2 nos. 12 mm dia holes provided
withsuitable brass bolts and double nuts, flat washers & 2 nos. bimetallic solderless sockets
suitable up to ACSR Panther or AAAC 232 mm2 conductor.
1.5.7 Spacing:- The minimum clearance between phase to the switch shall be 1200 mm. The
operating down rod shall be at a transverse distance of 300 mm from the outer limb of the
switch. The centre spacing between two post insulators of the same phase shall be 560 mm.
In the open position of the A.B. Switches the moving blade shall rotate through anangle of 90 0
. This shall be exhibited in the drawing.
1.5.8 Drawing & Literatures:- Drawings of each item i.e. 11 KV, 400 amp and 33 KV 400 amp, 3
Pole, single break A.B. Switch shall be furnished along with the tender.
The details of construction and materials of different parts of the A.B. Switches shall clearly
be indicated in the tender and illustrative pamphlet / literature for the same shall be
submitted along with the tender.
1.6 TESTS & TEST CERTIFICATE
1.6.1 Type Test:- Certificates for the following type tests conducted within five years
proceeding to the date of opening of tender on prototype set of A.B Switch in a Govt.
Approved Testing Laboratory preferably at CPRI, Bhopal/ Bangalore shall have to be
submitted for reference and scrutiny.
i. Impulse voltage dry test
ii. Power frequency voltage dry test
iii. Power frequency voltage wet test
iv. Temperature of resistance.
v. Measurement of resistance.
vi. Test to prove the capability of carrying the rated peak short circuit current and the rated short time current.
vii. Mainly active load breaking capacity test. viii. Transformer off-load breaking test.
ix. Line charging breaking capacity test.
x. Operation tests.
xi. Mechanical endurance test.
xii. Mechanical strength test for the post insulator as per IS-2544/1973.
xiii. Test for galvanization of metal (ferrous) parts as perm IS-2633/1973.
Besides, mechanical endurance test will have to be conduct on one set in the presence of our authorized person who shall be deputed to carryout acceptance tests before delivery of the materials.
1.6.2 Routine Tests: - The following routine tests shall have to be conducted on each sets and results are to be furnished for consideration of deputing inspecting officer for inspection and conducting testing of the materials.
1. Power frequency voltage dry test
2. Measurement of resistance of main circuit
3. Tests to prove satisfactory operation.
4. Dimension check
5. Galvanization test.
1.7 GUARANTEED TECHNICAL PARTICULARS:-
The Bidder shall furnish the guaranteed technical particulars duly filled in the format at
Appendix-I along with the tender.
1.8 COMPLETENESS OF EQUIPMENT:-
Any fittings, accessories for apparatus which may not have been specifically mentioned in this specification but which are usual or necessary in equipment of similar plant shall be deemed to be included in the specification and shall be supplied by the Tender without extra charge. All plant and equipment shall be completed in all details whether such details are mentioned in the specification or not.
1.9 INSPECTION:-Routine and acceptance tests shall be conducted at the place of manufacturer. The bidder are requested to furnish details of equipment which will be used for testing along with tender. The bidder of those manufacturers who do not have adequate testing facilities for conducting routine and acceptance test are liable for cancellation. The successful bidder has to furnish routine test certificate and guaranteed certificate for approval prior to offer of materials for inspection for each consignment of offer.
(To be submitted with offer)
GUARANTEED TECHNICAL PARTICULARS FOR 33KV, 400A, 50 HZ,
3 POLE, SINGLE BREAK TYPE
Sl.
No
Particulars
Desired values
Bidder
offer
1 2 3 4
1.
Maker s name and country
of origin
To be specified by the tenderer
2. Type of Switch Rotating type only
3. Suitable for mounting Horizontal only
4.
Number of supporting post
insulators per phase
4 nos.22 KV / 24 KV Post Insulators per phase
as per ISS-2544/1973.
5.
Post Insulator.
a)
Maker s name and country
of origin
To be specified by the tenderer
b)
Type of cementing
To be quoted for original cemented only &
as per IS-2544-1973 & relevant IEC.
c)
One minute power frequency
withstand voltage Dry
95 KV RMS.
d)
One minute power frequency
withstand voltage Wet
75 KV RMS.
e) Visible discharge voltage 27 KV RMS.
f)
Dry Flashover Voltage
To be specified by the tenderer
g)
Power frequency puncture
with stand voltage
1.3 times of actual dry flash over voltage
h)
Impulse withstand voltage
(switch in position)
170 KV (peak)
i)
Creepage distance (mm)
380 mm minimum. (actual creepage distance for which type test have been conducted is to be specified by the tenderer
6.
Impulse withstand voltage
for positive and negative
polarity 1.2 / 50 mircro-
second wave
a)
Across the isolating distance
195 KV (peak)
b)
To earth & between poles
170 KV (peak)
7.
One minute power frequency
withstand voltage
a)
Across the isolating distance
80 KV (RMS)
b)
To earth & between poles
70 KV (RMS)
8.
Rated normal current and
rated frequency
400 amps. 50 Hz
9.
Rated short time current.
16 KA ( RMS )
10.
Rated short circuit making
capacity
25 KA (RMS)
11.
Rated peak withstand current
40 KA ( Peak )
12.
Rated cable charging
breaking capacity
40 KA ( RMS )
13.
Rated Transformer off load
breaking capacity
16 Amp (RMS)
14.
Rated line charging breaking
capacity
5.3 Amps ( RMS)
15.
Minimum clearance between
adjacent phases
a)
Switch Closed ( centre to
centre)
1200 mm
b)
Switch Opened ( centre to
edge of blade)
640 mm
16.
Temperature rise
a)
Temperature rise shall not
exceed the maximum limit as specified below at an
ambient temperature not exceeding in 40
0 C
b)
Copper contacts in air 65
0 C
c)
Terminal of switch intended to
be connected to external
conductor by bolts
50 0
C
17.
Vertical Clearance from top of
insulator cap to mounting
channel
508 mm (minimum)
18.
Type of Contact: -
a) Self aligned, high pressure jaw type fixed
contacts of electrolytic copper of size 80
mm x 50 mm x 8 mm duly silver plated. Each
contact should be revetted with three nos.
Copper rivets with a bunch (minimum
3 mm thick) consisting of copper foils, each
may vary from 0.15 mm to 0.25 mm. These
total thickness of copper foils per jaw
should be 6 mm. Jaw assemblies are to be
bolted through stainless steel bolts and nuts
with stainless steel flat and spring washer.
b) Solid rectangular blade type moving
contact of electrolytic copper size 250 mm x
50 mm x 8 mm duly silver plated ensuring a
minimum deposit of 10 micron of silver on
copper contacts or as may be prescribed
under relevant ISS / IEC.
c) Pressure spring to be used in jaw contacts
shall be Stainless Steel having 8 nos of turn x
28 mm height x 14.4 mm diameter with
14 SWG wire (minimum six nos springs shall
be used)
19.
Connectors:-
Terminal connectors for both movable and
fixed should be of copper flats of same size
similar to that of moving contact blades
(minimum 95% copper composition). The
fixed connector shall of size 80 mm x 50 x 8 mm
and the size of movable connector shall be size
80 x 50 x 8 mm with machine finishing
duly silver plated with 2 nos. of
stainless steel bolts, nuts, plain washers
& spring washers should be provided along
with 2 nos solder less bimetallic sockets for
each connector suitable sockets for each
connector suitable up to
232 mm AAA conductor.
20.
Moving Contacts:-
Movable contact is to be supported by
galvanized angle of 50 x 50 x 5 mm in each
phase and the moving contact are to be
bolted through 2 no stainless steel bolts and
nuts with suitable stainless steel flat and
spring washers.
21.
Galvanization
a) Iron parts shall be dip galvanized as per
IS-2633/1972.
b) b) The pipe shall be galvanized as per IS-
4736/1968.
22.
Details of Phase
a)
Coupling Rod
25 mm nominal bore G.I. pipe medium
gauge.
b)
Operating Rod
32 mm nominal bore G.I. pipe medium
gauge single length 6 mtrs. The detailed
dimension of the G. I. pipe as per IS-1239 (Pt.
I) as mentioned below :-
Nominal
base (mm)
Outside
diameter
(mm)
Diameter
thickness (mm)
Max Min
25 34.2 33.3 3.25
32 42.9 42 3.25
c)
Arcing Horns
10 mm dia G.I. rod with spring assisted
operation.
d)
Force of Fixed contact spring
To be specified by the tenderer.
e)
Copper braided flexible
tapes:-
450 mm length of flexible electrolytic
copper tape or braided chord (with tin
coated) having minimum weight 450 gms per
meter and both ends shall be crimped with
copper sockets through brass bolts and nuts
with brass flat washers. Two nos of suitable
copper sockets shall be used at both ends. The
minimum no. of flexible wires should be 1536
of 36 SWG for each flexible chord.
f)
Quick break device
Lever mechanism.
g)
Bearings
4 nos. self lubricated bearing to be provided
with grease nipple including 4th bearing
being a thrust bearing.
h)
Locking arrangement
Pad Lock & Key arrangement at both ON
& OFF ion.
i)
Earth Terminal:
To be provided at base channels.
23.
Supporting Channels
100 mm x 50 mm M.S. Channel hot dip
galvanized.
24.
Weight of each pole
complete
To be specified by the tender
GUARANTED TECHNICAL PERTICULARS OF 11KV 400AMP 3 POLE AB SWITCH
Slno. Perticulars Requirement Bidders Offer
List of relevant standards :IS
1818,9921,2544,1394,4691,325,
4722, 2629, 4759, 2633,1573,3033,
2016, 3961, 5561, 1554, 5578,
11353,9920
1 name & Address
To be specified by the bidder
2 Type of Switch Rotating Type
3 Suitable for mounting Horizontal only
4 No. of Breakers per phase
Single Break
5 No. of Post Insulators per phase 2nos. of 12KV Post Insulators as per
IS:2544/73 per phase
6
(a)
Post Insulators
Name & Country of
Manufacture
of Post Insulator
Techno Ceramic / Allied Ceramic
/JSI/equivalent Type Test certificates to
be provided along with the offer.
(b) Type of cementing Original Cementing. The insulator to be
cemented with MCI (Hot dip galvanised
/Al Alloy cap and MCI/Forged steel hot
deep galvanized pedestral)
(c) Power frequency withstand
voltage (Dry)
65KV RMS
(d) One minute Power frequency withstand
voltage (wet)
40KV RMS
(e) Visible discharge voltage
9KV RMS
(f) Dry flash over voltage 70 KV
(g) Power frequency puncture withstand
voltage
110KV
(h) Creapage distance 320 mm
(7) Impulse withstand voltage for positive
& negative polarity (1.2/50
micro second wave)
(a) Across the isolating distance
85KV Peak
(b) To earth & between poles
75KV Peak
8 Rated one minute
Power frequency withstand
voltage
(a) Across the Isolating distance
32KV(RMS)
(b) To earth & between poles
28KV(RMS)
9(a) Rated voltage
nominal/maximum
11/12KV
(b) Rated normal current and rated frequency
400 Amps. 50hz
10 Rated short-circuit making
capacity
20KA (Peak)
11 Rated Short-time current
16KA
12 Rated peak withstand current
40KA
13 Rated mainly active load breaking capacity
10KA
14 Rated transformer off load breaking
capacity
16.3A
15 Rated line charging capacity
2.5A(RMS)
16 Rated cable charging capacity
10A(RMS)
17 Minimum clearance between
adjacent
phase
(a) Switch closed (center to center)
Mm
(b) Switch opened (Center of post
insulator to the
edge of the blade)
Mm
18 Temperature rise The
Temperature rise should not exceed
the
maximum limit to 65oC
at an ambient temperature not
exceeding 40oC
The Temperature rise of contacts &
terminals are within permissible limit of
650C & 50oC respectively.
19 Vertical clearance from Mm
top of insulator cap to mounting
channel
20 Type of connect a) Self aligned high pressure law type fixed contacts of hard drawn
copper of size 50X8X70 mm
contact is riveted with three nos.
copper rivets with a bunch of
copper strips suitable to give
desired spring action.
b) Solid rectangular blade type
moving contact of size 50X8 mm
and length 220 mm duly silver
plated.
c) Stainless Steel 4 NOS of
Pressure springs are to be used in
each jaw contacts having 8nos. of
turns X28mm heights
X14.4mm diameter with 14 SWG
wire
21(a) Terminal connector
(fixed)
Copper flat of size 50X8 mm and length
95mm duly silver plated with 1
no. long 1/ dia G.I. Nut Bolt &
Spring washers suitable for 10Sq.mm
conductor.
(b) Terminal connector
(Movable)
Copper flat of size 50X8mm and length
100mm duly silver plated with
1no long dia G.I. Nut Bolt & Spring
washers suitable to accommodate
bimetallic socket up to 100 sq mm.
conductor.
22 Terminal supporting flat Movable terminal contact is supported by G.I. flat of size 50 X
8mm X 370mm on each phase.
23
(a)
Phase Coupling Rod ISI mark 25mm nominal bore G.I. Pipe (Medium) conforming to
IS:1239/Part
(b) Operating Rod ISI mark 32mm nominal bore G.I.
Pipe (Medium) conforming to
IS:1239/Part
(c) Arcing Horn 10mm dia G.I. Rod
(d) Force of fixed contact spring
30 lbs to 50 lbs
(e) Copper braided flexible taps 320mm long 2no. tin coated copper braided flexible tape both end seated
with cupper sheets duly punched for
fixing
(f) Quick break device Lever mechanism
26 Fastners All fastners (nut & bolds) should be hot-dip galvanished & should be
provided with spring and plane
washers.
27 Material & Dimension of
Coupling Pipe
28 Material & Dimension of
Operating Rod
29 Sockets (Lugs) Shall be tinned cupper sholder less
crimping type confirming to IS : 8309
& 8394 suitable for aluminium
conductor. The cable lugs shall suit
the type of terminals provided. The
cable lug shall be of Dowel make.
30 Detailed drawing submitted ?
Yes
TECHNICAL SPECIFICATION FOR 33KV, 400 AMP , 3 POLE HG FUSES
SCOPE:This specification covers the design manufacture, shop testing, loading, transportation and
delivery at sub-station site of 33KV, 400Amp, 3Pole & 11KV, 400Amp, 3Pole H.G. Fuse Sets for outdoor
installations to be used at 33/11KV Sub-stations suitable for operation under off load conditions.
The 33KV. 400Amps, 3 Pole H.G Fuse Sets shall confirm to the following parameters:-
i) Number of Poles:- 3
ii) No. of insulator per pole:- 4nos. 22/24KV Post Insulator/ Phase
iii) Nominal system voltage 33 KV
iv) Highest system voltage:- 36KV
v) Rated frequency:- 50 Hz
vi) System earthing:- Effectively earthed
vii) Rated normal current 400 Amps
viii) Altitude of installation Not exceeding 1000 M.
The post insulator used in the H.G. Fuse set shall have the following ratings:-
i) Power frequency withstand voltage (dry) 95KV (RMS)
ii) Power frequency withstand voltage ( wet) 75 KV (RMS)
iii) Impulse withstand voltage (dry) 170 KV (Peak)
iv) Power frequency puncture withstand voltage 1.3 times the actual dry flashover voltage of the unit.
STANDARDS:- The H.G. Fuse Set shall conform to the following standards:-
i) IS- 5792- 1973 (For high voltage expulsion fuses & similar fuses)
ii) IS-2544-1973 ( for porcelain post insulators)
iii) IS-9385-1979 or its latest amendments if any.
iv) IS-2633-1979 ( For Galvanization of ferrous parts )
INSULATORS:The 22KV/ 24KV post insulators complete with pedestal cap duly cemented to be used in the H.G. Fuse sets confirming to IS-2544/1973.
The bidder shall mention make, type of insulation materials, metal fittings, Creepage distance, protected Creepage distance, tensile strength compression strength, torsion strength and cantilever strength.
The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference & scrutiny.
TECHNICAL DETAILS:The H.G. Fuses shall have adjustable arcing horns made of solid copper rod having
8.23 mm dia. The horns shall be fitted with screwing devices with flynuts for fixing and tightening
the fuse wire. It shall have robust terminal connector 5s of size 80mm x50 mm x 8 mm made of
copper casting ( 95% minimum copper composition) duly silver plated with two numbers of 12mm dia
brass bolts and double nuts with flat brass washers. The connector should be capable of connecting
crimp able conductor up to 232 Sq.mm. size (ACSR/ AAAC) with bimetallic solder less sockets .The H.G.
Fuse Set shall suitable for horizontal mounting on sub-station structures. The minimum clearance
between the adjacent phases of the fuse set shall be 1200 mm and the centre to centre (distance
between two post insulators of the same phase) shall be 760 mm. All metal (ferrous) parts shall be
galvanized and polished. Only post insulator (original cemented and not pin insulators shall be used
for the H.G. Fuse Set.
DRAWIING & LITERATURES:Three copies of drawings of 33KV, 400Amp, 3 Pole H.G. Fuse shall be
furnished along with the tender for reference. The details of construction and materials of different parts
of the H.G Fuse shall clearly be indicated in the tender and illustrative pamplet/ literature for the same
shall be submitted along with the tender.
TESTS & TEST CERTIFICATE: Type Test:-Certificates for the following type tests conducted within
five years proceeding to the date of opening of tender on a prototype set of H.G. Fuse in a
Govt. Approved Testing Laboratory preferably at CPRI Bangalore shall be submitted along
with the tender.
i) Impulse voltage dry test
ii) Power frequency voltage dry test
iii) Power frequency voltage wet test
iv) Temperate of resistance.
v) Test to prove the capability of carrying the rated peak short circuit current and the rated short time current.
vi) Mainly active load braking capacity test.
vii) Transformer off-load breaking test.
viii) Line charging breaking capacity test.
ix) Operation tests.
x) Mechanical endurance test.
xi) Mechanical strength test for the post insulator as per IS:2544/1973, 5350 (Pt- II)/1970 & relevant IEC.
xii) Test for galvanization of metal (ferrous) parts as per IS- 2633/1973.
Besides above, mechanical endurance test will have to be conducted on one set in the presence of our authorized person who shall be deputed to carryout acceptance test before delivery of the materials.
Routine Tests:-
The following routine tests shall have to be conducted on each sets and results are to be furnished for consideration for acceptance of deputing inspecting Officer for inspection & conducting testing of the materials
.i) Power frequency voltage dry test.
ii) Tests to prove satisfactory operation.
iii) Dimension check.
iv)Galvanisation test.
GUARANTEED TECHNICAL PARTICULARS: The bidders are required to furnish the guaranteed technical particulars at Schedules attached to this specification duly filled in along with the tender.
COMPLETENESS OF EQUIPMENT:-
Any fittings accessories or apparatus which may not have been specifically mentioned in this specification but which are usually necessary in equipment of similar plant shall be deemed to be included in the specification and shall be supplied by the bidder without extra charge. All plant and equipment shall be complete in all details whether such details are mentioned in the specification or not.
INSPECTION AND TESTING:-
The Purchaser shall have free entry at all times, while work on the contract is being performed, to all parts of the manufacturer works which concern the processing of the equipment ordered. The manufacturer shall afford the Purchaser without charge, all reasonable facilities to assure that the equipment being furnished is in accordance with this specification.
The equipment shall successfully pass all the type tests and routine tests referred to and those listed in the most recent edition of the standards given in this specification.
The Purchaser reserves the right to reject an item of equipment if the test results do not comply with the values specified or with the data given in the technical data schedule.
Type tests shall have been / shall be carried out at CPRI / National Govt. approved Laboratory and be witnessed by a representative of such laboratory or some other representative acceptable to the Purchaser. Routine tests shall be carried out by the
Supplier at no extra charge at their works.
Adequate facility with calibrated testing equipment must be provided by the manufacturer free of cost to carry out the tests. Type test certificates must be furnished along with the tender for reference of the Purchaser.
All costs in connection with the testing, including any necessary re-testing, shall be borne by the Supplier who shall provide the Purchaser with all the test facilities which the latter may require, free of charge. The Purchaser shall have the right to select the samples for test and shall also have the right to assure that the testing apparatus is duly calibrated and correct. Measuring apparatus for routine tests shall be calibrated at the expense of the Supplier at an approved laboratory and shall be approved by the Purchaser.
The Supplier shall be responsible for the proper testing of the plant or materials supplied by sub-suppliers to the same extent as if the work, plant or materials were completed or supplied by the Supplier.
Any cost, incurred by the Purchaser in connection with inspection and re-testing as a result of failure of the equipment under test or damage during transport or offloading shall be to the account of the Supplier.
The supplier shall submit to the Purchaser five signed copies of the test certificates, giving the results of the tests as required. No materials shall be dispatched until the test certificates have been received by the Purchaser and the Supplier has been informed that they are acceptable.
The test certificates must show the actual values obtained from the tests, in the units used in this specification, and not merely confirm that the requirements have been met.
In the case of components for which specific type tests or routine tests are not given in this specification, The Supplier shall include a list of the tests normally required for these
components. All materials used in the Contract shall withstand and shall be certified to have satisfactorily passed such tests.
The Purchaser at his discretion may re-confirm the Test Results in his own laboratory or laboratory of his choice.
No inspection or lack of inspection or passing by the Purchaser s Representative of equipment or materials whether supplied by the Supplier or sub-supplier, shall relieve the Supplier from his liability to complete the contract works in accordance with the contract or exonerate him from any of his guarantees.
GURANTEED TECHNICAL PARTICULARS FOR 400 AMP, 3 POLE, H.G. FUSES.
Sl.
No.
Particulars
Desired Values for
Bidder
Offer
33 KV
1 2 3 4
1
Maker's name and
country or origin
To be specified by the bidder.
2
Suitable for mounting
Horizontal only.
3
Number of supporting
post
insulator per phase
4 nos. 22KV/24KV Post Insulator per phase as per ISS -
2544/ 1973
4 Post Insulator
(a)
Maker's name and
country or origin
To be specified by the bidder
(b)
Type of cementing
To be quoted original cemented only.
(c )
One minute power
frequency withstand
voltage dry
95KV RMS
(d)
One minute power
frequency withstand
voltage wet.
75 KV RMS.
(e)
Visible discharge
voltage
27KV RMS
(f)
Dry Flashover
Voltage
To be specified by the bidder
(g)
Power frequency
puncture withstand
voltage
1.3 times of actual dry flash over voltage.
(h)
Impulse withstand
voltage (switch in
position)
170KV (peak)
(I )
Creepage distance
380mm minimum. (actual creepage distance for
which type test have been conducted is to
be specified by the bidder)
5
Impulse withstand
voltage for positive
and negative
polarity (1.2/50
micro second wave)
(a)
Across the isolating
distance
195 KV (peak)
(b)
To earth & between
poles
170 KV (peak)
6
One minute power
frequency withstand
voltage
(a)
Across the isolating
distance
100 KV (RMS)
(b)
To earth & between
poles
75 KV (RMS)
7
Rated normal current and rated frequency.
400 amps, 50 Hz , 3 Pole
8
Operating Voltage
33 KV
9
Vertical clearance
from top of insulator
cap to mounting
Channel
508 mm (minimum)
10
Height of the riser
for carrying the
horns.
250mm from the cap
(top) of insulator.
11
Details of Arcing
Horns
Copper rod having 8.32 mm dia Silver-plated provided
with screwing arrangement for fixing use wire made of
copper casting. (Total length 995mm). All the bolts, nuts
and washers should be made out of brass.
12
Riser Unit
(250mm total height).
(a) The shape of connectors may be made of
straight copper Flat of size adequate enough to carry a
current density not ess than 1.5 Amp/ mm .
2 Nos of 3/8 G.I. Bolts, double nuts, plain and spring
washers and 2 nos. solder less bimetallic shockets per each
connector suitable up to 232mm AAA conductor.
(b) 170mm height G.I. Risermade of 25mm nominal
bore medium gauge G.I. Pipe welded with 2 nos. G.I.
Flat of 35 x 5 mm at both ends fixed with 10mm dia
stainless steel, bolts and nuts with flat stainless steel
spring washers.
13
Supporting
Channels
100 x 50 x 6 mm M.S. Channel (galvanized)
14
Galvanisation
All ferrous parts should be galvanized as per IS-
2633/1972 & all non-ferrous part should be duly
galvanized..
15
Weight of each pole
(complete)
To be specified by the tenderer.
33KV 3-Pole 200 Amp H.G Fuse
Technical Specification
1. SCOPE: - This specification covers the manufacture, testing and supply
of 33 KV 200 Amps 3 pole, H.G. Fuse Sets.
2. (a) The 33 KV H.G. Fuses shall be suitable for out door operation in horizontal
configuration under the climatic conditions specified. It shall be of the following
ratings:-
1 Number of Poles 3 2 No.of Insulator per Pole 4 nos. 22 KV /24 KVpost Insulators per phase
3 Nominal system Voltage 33 KV 4 Highest System of Voltage 36 KV 5 Rated frequency 50 Hz 6 System Frequency Effectively earthed 7 Rated normal current 200 Amps 8 Altitudes of installation Not exceeding 1000 M.
(b) The post insulator used in the H.G. Fuse set shall have the following ratings :-
1 Power frequency withstand voltage (dry) 95 KV (RMS) 2 Power frequency withstand voltage (wet) 75 KV (RMS) 3 Impulse withstand voltage (dry) 170 KV (Peak) 4 Power frequency withstand voltage 1.3 times the actual dry flashover
voltage of the unit
3. STANDARDS :- The H.G. Fuse set shall confirm to the following standards. IS- 9385-1980 ( for high voltage expulsion fuses and similar fuses).
IS- 2544-1973 ( for porecelain post insulators or its latest amendments if any.). IS- 2633- 1979 ( for Galvanisation of ferrous parts).
4. INSULATOR MAKE :- 22/24 KV post insulator complete with pedestal cap duly
cemented to be used in 33 KV H.G. Fuse sets confirming to IS-2544/1973.
5. TECHNICAL DETAILS :- The H.G. Fuses shall have adjustable arcing horns made
of solid copper rod having 8.23 mm dia. The horns shall be fitted with screwing
devices with fly nuts for fixing and tightening the fuse wire. It shall have robust terminal
connector of size 80 mm x 50 mm x 8 mm made of copper casting ( 95 % minimum
copper composition) duly silver plated with two numbers of 12 mm dia brass bolts
and double nuts with flat brass washers. The connectors should be capable of
connecting crimpable conductor upto 80 Sq. mm size( ACSR/ Alloy) with bimetallic
solderless sockets. The H.G Fuse Set shall suitable for horizontal mounting on sub
station structures. The minimum clearance between the adjacent phases of the fuse set
shall be 1200 mm and the centre to centre (distance between two post insulators of the
same phase) shall be 760 mm. All metal (ferrous) parts shall be galvanized and polished.
Only post insulator ( orginal cemented and not pin insulators shall be used for the H.G.
Fuse Set.
6. CLIMATIC CONDITIONS :- The H.G. fuse set shall be suitable for operation
under the following climatic conditions.:-
1 Maximum ambient air temperature 450 C
2 Maximum daily average air temperature 350 C
3
Maximum yearly average ambient air temperature 300 C
4 Maximum temperature attainable by a body exposed to the sun.
500
C
5 Minimum ambient air temperature 00 C
6 Maximum relative humidity 100% 7 Average number of thunderstorm days per annum 70 days 8 Average number of rainy days per annum 120 9 Average annual rain fall. 50 cm 10 Number of months of tropical monsoon conditions 4 11 Maximum wind pressure 260 Kg/mm 12 Degree of exposure to atmospheric pollution. Normally polluted
atmosphere.
7 Type Test :-
Certificate for the following type tests conducted (within five years proceeding to the date of opening of the tender) on a prototype set of H.G. Switch in a NABL approved test house/CPRI shall have to be submitted along with offer.
i) Dielectric test (impulse & one minute wet power frequency withstand voltage test.)
ii) Temperature rise test ( for terminals)
iii) Mechanical strength test for the post of insulator as per IS-2544/1973
iv) Test for galvanization of metal (ferrous) parts.
8. ROUTINE/ACEPTANCE TESTS :-
The inspection may be carried out by the Purchaser at any stage of manufacture. The
successful bidder shall grant free access to the Purchasers representative at a
reasonable time when the work is in progress. The following routine tests shall have to
be conducted on each set and results are to be furnished for consideration of
deputing inspecting officer for inspection and conduction testing of the materials at the
works of the manufacturer. the supplier shall give fifteen days advance intimation to
the Purchaser to enable him to depute his representative for witnessing the tests.
i) Power frequency voltage dry test
ii) Dimension Check
iii) Galvanization test.
9. Guaranteed Technical Particulars :
The bidders are required to furnish the guaranteed technical particulars duly filed in the
proforma along with the bid.
10. Completeness of Equipment :
Any fittings accessories or apparatus which may not have been specifically mentioned in
this specification but which are usually necessary in equipment of similar plant shall be
deemed to be included in the specification and shall be supplied by the bidder without extra
charge. All plant and equipment shall be complete in all details whether such details are
mentioned in the specification or not.
11. Inspection :
Routine and acceptance test shall be conducted at the place of manufacturer. The bidders are
requested to furnish details of equipments which will be used for testing along with the bid.
The bids of these manufacturers who do not have adequate testing facilities for conducting
routine and acceptance test are liable for cancellation. The successful bidder has to furnish
routine test certificate and guarantee certificate for each consignment of materials to be
inspected at the time of offer of materials for inspection.
Sl.
No
Particulars
Requirement
Bidders offer
33 KV ,200 Amps.3 pole H.G Fuse
1 Makers name & Address To be specified by the bidder
2 Operating voltage 33 KV
3 No. of Post Insulators per
phase
4nos. of 22KV/24 KV Post Insulators per phase
4 Rated normal current & normal frequency
200 Amp., 50 Hz
5 Vertical clearance from the top of insulator to mounting
channel
508 mm (minimum)
6 Height of the riser for carrying
the horn.
250 mm from the cap top of
insulator
7 (a)
Post Insulators :
Makers Name & Country of Manufacture of Post Insulator
Reputed make . All the post insulators provided shall be of
same make.
(b) Type of cementing Original Cementing only.
(c) 1 minute Power frequency
withstand voltage (Dry)
95KV RMS
(d) 1 minute Power frequency
withstand voltage (wet)
75KV RMS
(e) Visible discharge voltage 27KV RMS
(f) Dry flash over voltage 95 KV
(g) Power frequency puncture
withstand voltage
1.3 times of actual dry flash over
voltage.
(h) Creapage distance 430 mm(minimum). Actual creepage distance for which type
test has been conducted is to be
supplied.
8. Impulse withstand voltage for positive & negative polarity
(1.2/50 micro second wave)
(a) Across the isolating distance 195KV (Peak)
(b) To earth & between poles 170KV (Peak)
9. One minute Power frequency withstand voltage
(a) Across the Isolating distance 100KV(RMS)
GUARANTEED TECHNICAL PARTICULARS of 33 KV 200 Amp
3 Pole HG Fuse
(b) To earth & between poles 75KV(RMS)
10 1.2/50 microsecond wave
impulse flash over voltage
To be specified by the bidder
11 Details of Arcing Horn 1 SWG (8.23 mm) copper rod silver plated provided with screwing
arrangement on the fuse carrier made
of copper casting for fixing fuse wire
(Total length -995 mm). All the
bolts, Nuts and washers should be
made out of Brass.
12 Riser Unit (250 mm height total)
a) Riser cum Connector made out of copper casting (with minimum 95%
copper composition having riser size
(80 mmx50mmx8 mm) and
connector of size (80 mmx50mmx8
mm) duly silver plated and machine
finishing provided with 2 nios.12
mm dia. brass bolts and double brass
nuts with flat brass washers and 2
nos. solderless bimetallic socket per
each connector suitable upto 80 mm
conductor. The sockets shall be
preferably of Usha Martin make.
b) 170 mm height G.I Riser made of 25 mm nominal bore medium gauge
G.I pipe welded with 2 nos. of G.I flat
of 35mmx5mm of both ends fixed
with 10mm dia. stainless steel bolts
and nuts with flat & stainless steel
spring washer.
13. Galvanization a) All ferrous parts shall be hot- dipped Galvanized as per
IS.2629/1985 (Latest Amendment)
b)The pipe shall be galvanized as per IS-4736/1968(Latest Amendment)
14 Supporting Channel 100mmx50mm M.S.Channel. (Hot dip galvanized)
15 Weight of each pole 50 Kg (Approximately)
16 Detailed drawing submitted ? To be provided by bidders
N.B i) Ferrous parts shall be duely galvanized as per IS :2629/1985(1st. Revision),
(Amendment-2) and non-ferrous parts shall be silver plated.
ii) Certificate from a Government approved laboratory regarding composition of copper in
electrolytic copper casting of materials should be submitted during inspection of materials
at the cost of tenderer.
iii) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control & testing of materials shall be governed by the relevant IS with latest Amendment.
11KV 2/3 Pole D.O. Fuse 200Amp
01) SCOPE:
This specification covers outdoor, open, drop out expulsion type fuse cut outs suitable for installation in
50Hz, 11KV distribution system for protection of H. T. lines and transformer centers, Tap lines. The 11KV D.O.
fuses offered shall be complete with all components necessary for its effective and trouble free operation.
02) APPLICATION:
The distributions fuse Drop outs are intended for use on distribution transformers and have no inherent load break
capacity.
03) APPLICABLE STANDARD:
Unless otherwise modified in this specification, the Drop out fuse shall conform to IS: 9385 (Part-I to III) as
amended from time to time.
04) RATED VOLTAGE:
The rated voltage shall be 12 KV.
05) RATED CURRENT:
The rated current shall be 200 A.
06) RATED LIGHTING IMPULSE WITH STAND VOLTAGE VALUES FOR THE FUSE BASE:
The rated lightning impulse withstands voltage both for positive and negative polarities shall be as given below.
a) To earth and between pole: 75 KV (Peak)
b) Across the isolating distance: 85KV (Peak) of fuse base.
07) RATD ONE MINUTE POWER FREQUENCY WITHSTAND VOLTAGE (DRY AND WET)
VALUES FOR THE FUSE BASE:
a) To earth and between poles: 28KV (rms)
b) Across the isolating distance: 35KV (rms)
08) TEMPERATURE RISE LIMIT (IN AIR) :
a) Copper contacts silver faced: 65C
b) Terminals: 50C
c) Metal parts acting: The temperature shall not reach as springs such a value that elasticity of the Metal is
changed.
09) BREAKING CAPACITY:
The breaking capacity of D.O. Fuse element shall be 8 KA (asymmetrical).
10) GENERAL REQUIREMENTS/CONSTRUCTIONAL DETAILS:
10.1 The D.O. Fuse shall be of single vent type (downward) having a front connected fuse carrier suitable
for angle mounting.
10.2 All ferrous parts shall be hot dip galvanized in accordance with the latest version of IS: 2633.
Nuts and bolts shall conform to IS:1364. Spring washers shall be electro-galvanized.
11) FUSE BASE TOP ASSEMBLY:
11.1 The top current carrying parts shall be made of a highly conductive copper alloy and the contact
portion shall be silver plated for corrosion resistance and efficient current flow. The contact shall
have a socket cavity for latching and holding firmly the fuse carrier until the fault interruption is
completed within the fuse.
11.2 The top contact shall be actuated by a strong steel spring which keeps it under sufficient pressure
to maintain a firm contact with the fuse carrier during all operating conditions. The spring
shall also provide flexibility and absorbs most of the stresses when the fuse carrier is pushed
into the closing position.
11.3 The current carrying parts of the assembly shall be protected from water and dust formation by
a stainless steel top cover.
11.4 The top contact assembly shall have a robust galvanized steel hook to align and guide the fuse
carrier in to the socket latch even when the fuse carrier is closed at an off centre angle.
11.5 The top assembly shall have an aluminum alloy terminal connector
(refer clause 19).
11.6 The top assembly shall be robust enough to absorb bulk of the forces during the fuse carrier
closing and opening operations and shall not over stress the spring contact. It shall also
prohibit accidental opening of the fuse carrier due to vibrations or impact.
12) FUSE BASE BOTTOM ASSEMBLY:
12.1 The conducting parts shall be made of high strength highly conductive copper alloy and the contact
portion shall be silver plated for corrosion resistance and shall provide a low resistance current
path from the bottom fuse carrier contacts to the bottom terminal connector.
12.2 The bottom assembly shall have hinge contacts made from highly conductive, anti-corrosive copper
alloy and shall accommodate and make a firm contact with the fuse carrier bottom assembly. The
fuse carrier shall be placed easily in or lifted from the hinges without any man handling. In
addition, the bottom assembly shall perform the following functions.
i) When opened manually or after fault interruption the fuse carrier shall swing through 180 to the vertical
and its further travel shall be prevented by the fuse base bott