06051 MANOR 2 ELEC SPEC Rev02 16032007.pdf

8/17/2019 06051 MANOR 2 ELEC SPEC Rev02 16032007.pdf

1/236

BPS ♦ 06051 ♦ Revision 02 Date of Issue: 15.03.2007

Technical Specification

ELECTRICAL SERVICES

Project

THE MANOR IN HCMC – PHASE 291 NGUYEN HUU CANH – BINH THANH – HCMC

Client

BITEXCOLAND

Consultants

PROJECT MANAGEMENT: COTEBA MANAGEMENT

QUANTITY SURVEYORS: LEVETT & BAILEY

PROJECT ARCHITECTS: HO THIEU TRI ARCHITECTS & ASSOCIATES

STRUCTURAL ENGINEERS: PIMENTEL & ASSOCIATES

FOUNDATION ENGINEERS: CTFE

MECHANICAL & ELECTRICAL ENGINEERS: BONWAY PROJECT SERVICES (BPS)


2/236

THE MANOR IN HOCHIMINH CITY – PHASE II

TECHNICAL SPECIFICATION - ELECTRICAL SERVICES

TABLE OF CONTENTS

Page No.

BPS ♦ 06051 Revision 02

1. SCOPE OF WORK..................................................................................................................... 1

1.1 PROJECT DESCRIPTION.............................................................................................. 1

1.2

SERVICES DESCRIPTION............................................................................................. 1

1.3 DEFINITION OF TERMS ................................................................................................ 1

1.4 EXTENT OF WORK........................................................................................................ 2

1.5

SCHEDULE OF DRAWINGS ..........................................................................................2

2. CO-ORDINATION AND WORK BY MAIN CONTRACTOR ......................................................3

2.1

CO-ORDINATION ........................................................................................................... 3

2.2 WORKS BY MAIN CONTRACTOR................................................................................. 3

3.

SPECIFIC PROJECT REQUIREMENTS ................................................................................... 4

3.1 DESIGN REQUIREMENTS.............................................................................................4

3.2

AUTHORITIES REQUIREMENTS ............ ............ ............. ............ .............. ............ ....... 6

3.3 SYSTEM CONTROLS AND OPERATION...................................................................... 6

4. GENERAL REQUIREMENTS....................................................................................................7

4.1 SITE INSPECTION ......................................................................................................... 7

4.2

STATUTORY REQUIREMENTS AND STANDARDS.....................................................7

4.3 WARRANTIES ................................................................................................................7

4.4 SPECIFICATION AND DRAWINGS.............. ............ ............. ............ ............. ............ .... 7

4.5 DISCREPANCIES & OMISSIONS .................................................................................. 8

4.6 SETTING OUT OPENINGS AND MAKING GOOD............ ............. ............ .............. ...... 8

4.7 POSITIONING OF OUTLETS AND EQUIPMENT .......................................................... 8

4.8 CO-ORDINATION OF INSTALLATION....... ............ .............. ............ ............. ............. .... 8

4.9 PERFORMANCE AND GUARANTEE........... ............ ............. ............. ............. ............. .. 9

4.10

SHOP DRAWINGS ......................................................................................................... 9 4.11 AS - INSTALLED DRAWINGS ............ ............ .............. ............ ............. ............ ............. 9

4.12

EQUIPMENT DEVIATIONS............................................................................................ 9

4.13 PACKAGED EQUIPMENT............................................................................................ 10

4.14 SAMPLES AND PROTOTYPES ................................................................................... 10

4.15 RADIO INTERFERENCE..............................................................................................10

4.16

LABELLING................................................................................................................... 11

4.17 WORKMANSHIP AND MATERIALS............................................................................. 11

4.18 POWER FACTOR, BALANCING & VOLTAGE DROP........ ............. ............. ............. ... 12

4.19

EARTHING....................................................................................................................12

4.20

COLOUR CODING........................................................................................................ 12

5. 24KV – MEDIUM VOLTAGE SWITCHGEAR...........................................................................13

6.

POWER TRANSFORMER.......................................................................................................13 6.1 GENERAL..................................................................................................................... 13

6.2 RATING......................................................................................................................... 13

6.3 CORES ......................................................................................................................... 14

6.4 WINDING...................................................................................................................... 15

6.5 UNDERCARRIAGE....................................................................................................... 18

6.6 OVERLOAD PROTECTION.......................................................................................... 18

6.7 NOISE LIMITS AND ANTI-VIBRATION PADS............. ............ .............. ............ ........... 19

6.8 TRANSFORMER ENCLOSURE ................................................................................... 19

6.9 TRANSFORMER FRAME EARTHING.......... ............. ............ ............ .............. ........... .. 19

6.10 BONDING ..................................................................................................................... 19


3/236



TABLE OF CONTENTS

Page No.


6.11 OFF-CIRCUIT TAP CHANGING................................................................................... 20

6.12 WINDING TEMPERATURE MEASUREMENT AND INDICATION ............................... 20

6.13

AIR FORCED COOLING (AF)...... ............. ............ .............. ............ ............. ............. .... 20

6.14 MINIMUM AIR CLEARANCE ........................................................................................ 20

6.15 TERMINALS AND CONNECTIONS..............................................................................21

6.16 TERMINAL MARKING, RATING PLATES, DANGER/WARNING SIGNS .................... 21

6.17

ACCESSORIES ............ ............. ............ ............. ............ ............. ............ ............. ........ 22

6.18 FINISHING AND PAINTING..........................................................................................22

6.19 TESTS........................................................................................................................... 23

6.20 PACKING FOR TRANSPORT AND HANDLING .......................................................... 25

6.21 STORAGE..................................................................................................................... 25

6.22

INSTALLATION............................................................................................................. 25 7. MAIN SWITCHBOARD ............................................................................................................ 26

7.1 GENERAL..................................................................................................................... 26

7.2 SHOP DRAWINGS ....................................................................................................... 26

7.3

MECHANICAL CONSTRUCTION................................................................................. 26

7.4 BUSBARS..................................................................................................................... 27

7.5 CABLE ENTRIES.......................................................................................................... 28

7.6 PAINTING ..................................................................................................................... 29

7.7 AIR CIRCUIT BREAKERS (ACB).............. ............ ............. ............ ............. ............. ..... 29

7.8 ISOLATING SWITCHES ............................................................................................... 30

7.9 COMBINED FUSE SWITCH UNITS .............................................................................30

7.10 PROTECTION RELAYS................................................................................................ 31

7.11

INDICATING INSTRUMENTS....................................................................................... 32

7.12 CURRENT TRANSFORMERS...................................................................................... 32

7.13 FUSES.......................................................................................................................... 32

7.14 MINIATURE AND MOULDED CASE CIRCUIT BREAKERS ........................................ 33

7.15 LABELLING................................................................................................................... 33

7.16 ZONING........................................................................................................................ 33

7.17

AUXILIARY RELAYS ............. ............ ............. ............ ............ ............. ............ ............. 34

7.18 TIMING RELAYS AND TIMERS ................................................................................... 34

7.19 TIME CLOCKS.............................................................................................................. 34

7.20 CONTROL SWITCHES.................................................................................................34

7.21

PUSHBUTTONS........................................................................................................... 34

7.22 INDICATING LIGHTS....................................................................................................34

7.23 CONTROL TRANSFORMER........................................................................................ 35

7.24

SPARE FUSE CABINET............................................................................................... 35

8. DISTRIBUTION BOARDS........................................................................................................ 36

8.1

GENERAL..................................................................................................................... 36

8.2 CIRCUIT BREAKER TYPE DISTRIBUTION BOARDS.............. .............. ............ ......... 37

8.3 DISTRIBUTION BOARD LABELLING......... ............ .............. ........... ............. ............ .... 37

8.4 PAINTING AND FINISHING..........................................................................................38

8.5

ZONING........................................................................................................................ 38

8.6 AUXILIARY RELAYS ............. ............ ............. ............ ............ ............. ............ ............. 38

8.7 TIMING RELAYS AND TIMERS ................................................................................... 38

8.8

TIME CLOCKS.............................................................................................................. 38


4/236



TABLE OF CONTENTS

Page No.


9.

POWER STANDBY GENERATOR..........................................................................................39

9.1 GENERAL..................................................................................................................... 39

9.2 ENVIRONMENTAL CONDITIONS................................................................................ 39

9.3

GENERAL REQUIREMENTS....................................................................................... 40

9.4 ENGINE REQUIREMENTS...........................................................................................42

9.5 COOLING SYSTEM......................................................................................................44

9.6 STARTING EQUIPMENT.............................................................................................. 44

9.7

BATTERY CHARGER................................................................................................... 45

9.8

ALTERNATOR AND ANCILLARIES ........... .............. ............ ............. ............. ............ .. 46

9.9 OUTPUT RATING......................................................................................................... 48

9.10 CONTROL AND OPERATIONAL REQUIREMENTS............ ............. .............. ............. 48

9.11

DIESEL GENERATOR CONTROL CUBICLE............... ........... ............. ............. ........... 49 9.12 PROGRAMMABLE LOGIC CONTROLLER (PLC)........ ............. ............. ............. ......... 51

9.13 MONITORING AND PROTECTION.............................................................................. 52

9.14 EARTHING....................................................................................................................53

9.15

RATING PLATES.......................................................................................................... 53

9.16 FUEL SYSTEM ............................................................................................................. 54

9.17 TESTING AND COMMISSIONING............................................................................... 54

10. UNDERGROUND CABLE INSTALLATION............................................................................. 55

10.1 GENERAL..................................................................................................................... 55

10.2

EXCAVATION AND BACKFILL........ ............. ............ ............. ............ ............. ............ .. 55

10.3 HIGH PRESSURE PIPES............................................................................................. 55

10.4 REPLANTING OF TREES AND SHRUBS............ ............. ............ ............. ............. ..... 55

10.5

INSTALLATION OF CABLES........... ............. ............. ............. ............ ............. ............ . 56

10.6

CABLE BOXES ............................................................................................................. 56

10.7 TESTING....................................................................................................................... 57

10.8 LENGTH OF CABLE.....................................................................................................57

11. CABLES................................................................................................................................... 58

11.1 GENERAL..................................................................................................................... 58

11.2

MIMS CABLES.............................................................................................................. 58

11.3 ARMOURED CABLES ............ ............. ............ ............. ............ ............. ............ ........... 60

11.4 PVC/PVC CABLES .......................................................................................................60

11.5

CABLE SIZE .................................................................................................................61

11.6

COLOUR CODING OF CABLES................ ............. ............. ............ .............. ............ ... 62

11.7 SUBCIRCUIT WIRING.................................................................................................. 62

11.8 INSPECTION AND APPROVAL ................................................................................... 62

11.9

LENGTH OF CABLES...................................................................................................62

12. BUSWAY.................................................................................................................................. 63

12.1

GENERAL..................................................................................................................... 63

12.2 ENCLOSURE AND DEGREE OF PROTECTION........... ............. .............. ............ ....... 63

12.3 TEMPERATURE RISE.................................................................................................. 63

12.4

SHORT-CIRCUIT WITHSTAND STRENGTH............................................................... 63


5/236



TABLE OF CONTENTS

Page No.


13. LIGHTING FITTINGS............................................................................................................... 64

13.1 GENERAL..................................................................................................................... 64

13.2

BALLASTS AND TRANSFORMERS........... ............. ............. ............. ............ ............. .. 65

13.3 CAPACITORS............................................................................................................... 65

13.4 LAMP HOLDERS .......................................................................................................... 66

13.5

STARTER SWITCHES..................................................................................................66

13.6

TERMINAL BLOCKS.....................................................................................................66

13.7 EARTH SCREW............................................................................................................ 66

13.8 WIRING......................................................................................................................... 67

13.9 MOUNTING OF COMPONENTS.................................................................................. 67

13.10

DIFFUSERS.................................................................................................................. 67

13.11

INCANDESCENT FITTINGS......................................................................................... 68

13.12 EXTRA LOW VOLTAGE DICHROIC FITTINGS........................................................... 68

13.13 HIGH INTENSITY DISCHARGE FITTINGS.................................................................. 68

13.14 FLUORESCENT LUMINAIRES..................................................................................... 69

13.15 LAMPS.......................................................................................................................... 69

13.16 PACKAGING................................................................................................................. 69

13.17 FAULTS IN SERVICE ................................................................................................... 69

13.18 EMERGENCY LUMINAIRES ........................................................................................ 70

13.19 EXTERNAL LIGHTING ................................................................................................. 70

14. LIGHTING CONTROL SYSTEM.............................................................................................. 70

15. LIGHTNING PROTECTION SYSTEM...................................................................................... 71

15.1 GENERAL..................................................................................................................... 71

15.2

AIR TERMINAL ............ ............. ............. ............ ............. ............ ............. ............ ......... 71 15.3

DOWN CONDUCTOR...................................................................................................71

15.4 EARTHING SYSTEM.................................................................................................... 71

15.5 TESTING....................................................................................................................... 71

15.6

DRAWINGS AND RECORDS ....................................................................................... 72

15.7

SURGE PROTECTION................................................................................................. 72

16. FIRE ALARM SYSTEM............................................................................................................ 73

16.1 GENERAL..................................................................................................................... 73

16.2 ADDRESSABLE HEAT DETECTOR................. ............. ............ ............. ............. ......... 74

16.3

ADDRESSABLE SMOKE DETECTORS............. ............ ............ ............. ............ ......... 75

16.4

ADDRESSABLE MANUAL CALLPOINT ........... ............ ............ ............. ............ ........... 76

16.5 ADDRESSABLE INPUT MODULES ........... ............. ............. ............ ............. ........... .... 76

16.6

ADDRESSABLE OUTPUT MODULES .......... ............. ............ ............. ............. ........... 77 16.7

ALARM BELLS......... .............. ............ ............ ............. ............ ............. ............ ............. 77

16.8

ALARM SIGNALLING AND INTERLOCKING CONTROL............ ............. ............. ....... 77

16.9 MAIN FIRE ALARM PANEL ..........................................................................................79

16.10 POWER SUPPLY.......................................................................................................... 80

17. UTILITIES SYSTEMS .............................................................................................................. 81

17.1

CCTV SYSTEM............................................................................................................. 81

17.2

PUBLIC ADDRESS SYSTEM ....................................................................................... 81

17.3 TELEPHONE AND DATA CABLING SYSTEM........... ............. ............ ............. ............ 81


6/236



TABLE OF CONTENTS

Page No.


17.4 MASTER ANTENNA TELEVISION SYSTEM (MATV) ........... ............. ............. ........... .. 82

17.5

ACCESS CONTROL SYSTEM ............ ........... ............. ............ ............. ............. ........... 83

17.6 DOOR PHONE SYSTEM.............................................................................................. 84

18. MATERIALS & GENERAL INSTALLATION DETAILS............................................................85

18.1 MATERIALS.................................................................................................................. 85

18.2

RETICULATION............................................................................................................ 85

18.3

LIGHTING SWITCHES ................................................................................................. 85

18.4 GENERAL POWER OUTLETS..................................................................................... 86

18.5 COMBINATION SWITCH/PLUG OUTLETS (PLASTIC TYPE).............. ............ ........... 86

18.6 380 VOLTS, 3 PHASE OUTLETS............. ............ .............. ........... ............. ............ ...... 86

18.7

ISOLATING SWITCH.................................................................................................... 86

18.8

FINAL LOCATION OF OUTLETS ................................................................................. 87

18.9 CONDUITS AND FITTINGS..........................................................................................87

18.10 PENETRATIONS THROUGH WALLS AND FLOORS............. .............. .............. ......... 88

18.11 FIRE STOP ...................................................................................................................88

18.12 INSTALLATION OF CONDUITS...................................................................................89

18.13 CONDUITS IN CONCRETE.......................................................................................... 90

18.14 CABLE TRAYS ............................................................................................................. 90

18.15 WIRING DUCTS ........................................................................................................... 91

18.16 FASTENING AND FASTENING MATERIALS .............................................................. 91

19. PAINTING AND FINISHING..................................................................................................... 92

19.1 GENERAL..................................................................................................................... 92

19.2 COLOUR CODE............................................................................................................ 92

20.

TESTING AND COMMISSIONING ..........................................................................................93 20.1

GENERAL..................................................................................................................... 93

20.2 TEST INSTRUMENTS.................................................................................................. 93

20.3 TEST REPORT TERMS ............................................................................................... 94

20.4

COMMISSIONING ........................................................................................................ 94

21. SERVICE AND MAINTENANCE.............................................................................................. 95

21.1

SCOPE.......................................................................................................................... 95

21.2 SERVICE ...................................................................................................................... 95

21.3 SERVICE REPORTS .................................................................................................... 95

21.4

MAINTENANCE SCHEDULES ..................................................................................... 96

22. OPERATING AND MAINTENANCE MANUALS...................................................................... 97

22.1

GENERAL..................................................................................................................... 97

22.2

MANUAL CONTENTS................................................................................................... 97 22.3 AS INSTALLED DRAWINGS ........... ............. ............ ............. ............ ............. ............ .. 98

22.4 PRINCIPAL INSTRUCTIONS ....................................................................................... 98

APPENDIX A – SCHEDULE OF TENDER DRAWINGS

APPENDIX B – SCHEDULE OF TECHNICAL DATA

APPENDIX C – VIETNAMESE TRANSLATION


7/236

THE MANOR IN HOCHIMINH CITY – PHASE II Page 1



1.

SCOPE OF WORK

1.1

PROJECT DESCRIPTION

The Manor phase 2 project a new building and located at 91Nguyen Huu Canh Street,Binh Thanh District – Ho Chi Minh City.

The project will comprises 3 basements, 2 Podium floors and 2 Residential & OfficeTowers of 30 storey high and 16 storey high with constructional details as below:

Tower Level Usage GFA

A & B Basement 3,2 & 1 Car Parking & Technical Rooms 14,533 m2

A & B Ground & 1st floor Retails, Restaurant and Entertainment 6,278 m2

A 2

nd

~ 24

th

floor 458 Offitel Type A, A1, B, C, D, E 21,757 m

2

A 25th floor Outdoor Swimming Pools, Gym 436 m2

A 26th ~ 29th floors 21 Offitel Type N, O, P, Q, R 2,762 m2

B (gl 8~13) 2nd ~ 13th floors 48 Offitel Type F 3,883 m2

B (gl13~15) 2

nd ~ 16 floors96 Offitel Type G, H, I, j, K, L, M, G1,I1, K1, L1

7,505 m2

Total Construction Area: 57,154 m2

1.2

SERVICES DESCRIPTION

The services cover under this specification is for the supply, installation, testing &commissioning and maintenance during defect liability period of Electrical Systemsincluding: Power Substation, Standby Diesel Power Generator, Power Distribution,Lighting, Lightning Protection, Earthing, CCTV, MATV, Public Address, AccessSercurity, Telephone & Data Cabling and Fire Alarm Systems.

1.3 DEFINITION OF TERMS

The following definitions apply to the terminology used in this specification andassociated drawings.

Owner/Principal: BITEXCOLAND

Project Management: COTEBA MANAGEMENT

Quantity Surveyor: LEVETT & BAILEY

Architect Consultant: HO THIEU TRI ARCHITECTS & ASSOCIATES

Civil / Structural Consultant: CTFE / PIMENTEL & ASSOCIATES

M&E Consultant: BONWAY PROJECT SERVICES (BPS)

The Contractor: The M&E Trade Contractor appointed to carry out thework covered in the services specifications anddrawings.

Approval/Approved: Subject to the approval of the Owner/Principal orPM/Consultants.


8/236




1.4

EXTENT OF WORK

This specification, unless specifically stated otherwise, calls for the provision ofsystems complete in every respect, fit and ready for continuous, safe, efficientoperation. The Sub Contractor shall therefore supply, deliver, install, test, commissionand set to work the systems and they shall be complete with all necessary ancillaryand minor items, whether expressly indicated on the drawings or specification or not.

(i) Supply and installation of Power Substation including 24kV VCB MediumVoltage Switchgear and a 15(22)kV/0.4kV 50Hz 3P 4W Dry Cast ResinPower Transformers

(ii) Supply and installation of Standby Diesel Power Generators and AutoTransfer Switch.

(iii) Supply and installation of Main LV Switchboard (MSB) and All FloorDistribution Boards

(iv) Supply and installation of Consumer Mains, Sub-Mains to all Switchboardsincluding Services Switchboards (MSSB, FSSB, HSSB) and to isolationswitches for Supply / Exhaust Fans, Condensing Unit and FCU etc. asindicated in MVAC drawings

(v) Supply and installation of all Light Fittings, Cabling, Ducts, Conduits, andassociated accessories as detailed on the drawings and described herein

(vi) Supply and installation of Exit and Emergency Light Fittings

(vii) Supply and installation of Fire Alarm System, including AddressableSmoke/ Heat Detectors, Alarm Bells, Alarm control, Main Fire Alarm Panel

(viii) Supply and installation of all Power Outlets and/or connections toequipment, cabling, ducts, conduits and associated accessories as detailedon the drawings and described herein

(ix) Supply and installation of Lightning Protection System

(x) Supply and installation of CCTV, MATV, Access Control and Door PhoneSystems

(xi) Supply and installation of Public Address System (PA)

(xii) Supply and installation of Telephone and Data cabling include MDF, IDF

(xiii) Co-ordination with the Main Contractor and other Contractors

(xiv) All associated building work unless specifically nominated elsewhere in thisspecification. The work shall include Over-flashing of all electrical servicesroof penetrations, making good, fire stopping and painting

(xv) Testing, commissioning, maintenance and defects liability for the

completed work. This shall include:

● Defects liability for 52 weeks from date of Practical Completion.

● Maintenance during the defects liability period.

(xvi) Provision of 4 sets of Operating and Maintenance Manuals, including as-installed drawings in AutoCAD format and all testing & commissioning data.

1.5

SCHEDULE OF DRAWINGS

The drawings as listed in Appendix A shall be read in conjunction with thisspecification.


9/236




2.

CO-ORDINATION AND WORK BY MAIN CONTRACTOR

2.1

CO-ORDINATION

Co-ordinate and furnish all necessary information as required to the Main Contractorand other Contractors so that works can be carried out without undue delay to theconstruction programme.

Any additional work occasioned by lack of co-operation with the Main Contractor orany other Contractors will not be considered as a variation to the Contract or asgrounds for extension of time.

The Main Contractor will be responsible for checking all Contract penetration drawingsand for negotiating with the various Contractor/Contractors for amendment ofpenetration requirements as necessary.

2.2

WORKS BY MAIN CONTRACTOR

● The site to be fenced and space made available for sheds.

● Toilets and temporary water

● Assistance setting out

● Keeping site clean, removal of rubbish

● Excavation and back fill for services between buildings

● Provision of holes as required for the entrance, installation and access ofequipment and conduits

● Concrete trenches with access pits for cables.

● Casting-in of holding down bolts to templates provided.

● Waterproofing of plant room floor.

● Acoustically separate plant room structure. Ensure cavities are cleaned out.

● Building in of pipe sleeves.

● Drilling through concrete slabs or walls.

● Bund for above-ground oil tanks.

● Access to roof for maintenance.

● Fixing of guy anchors.

● Ventilation louvre to Plant rooms.

● Access panels in demountable ceiling to high maintenance items.

● Roof penetrations and under flashing (the Main Contractor to provide theunder-flashing, Contractor to provide the over-flashing).

● Make good to gardens, roads and paths after installation of services.


10/236




3.

SPECIFIC PROJECT REQUIREMENTS

3.1

DESIGN REQUIREMENTS

(a) Electricity Supply

The electricity supply will be 380V/50Hz/3P and 220V/50Hz/1P and Neutral fromthe Power Substation. All equipment shall be suitable for this supply.

(b) Consumer Mains & Metering

New consumer mains shall be installed from the Power Transformer to the LV-MSB to be located on the electrical room.

Meters will be installed inside the main switch-room for each of the jurisdictionsas indicated on the drawings. Arrange with the Supply Authority for metering tobe provided as shown and allow all necessary meter panels to their

requirements.

(c) Main Switchboard

Supply and install in the position shown on the drawings, one new mainswitchboard containing all equipment as shown on the single line diagram and asspecified herein. The switchboard shall be of the indoor, metal enclosure, airbreak type, suitable for operation in the switch-room shown on the drawings.The switchboard shall be capable of withstanding the thermal and magneticstresses set up by a fault level as shown on the drawings.

The switchboard shall be of free standing, top entry, dead front, totally enclosed,unitised, dustproof, back connected with lift off panels and constructed toconform to the requirements of AS3439 Form 2B. All outgoing connectingterminals shall be fully sleeved when sub-mains are terminated.

(d) Distribution Boards

Distribution boards shall be as detailed on the drawings. Provide ducting wherenecessary to conceal sub-circuit cables where they leave the distribution boards.

(e) Underground Cables: Refer relevant section elsewhere in this specification.

(f) Sub-mains

Sub-mains shall be as nominated on the drawings. The Sub Contractor, prior toordering cables, shall examine the architectural and structural details anddetermine the most appropriate sub-main route.

All sub-mains shall be run on cable tray. All sub-main cables shall be spaced oncable tray so as to avoid de-rating in accordance with AS3008 Figure 1.

(g) Power Outlets and Isolators

Supply and install power outlets and Isolators as shown on the drawings

(h) Lighting Fittings

Light fittings shall be as nominated and as scheduled and approved byConsultant.

Localised on/off controls shall be provided to all areas to enable manualswitching of lighting as shown on the drawings


11/236




Lights shall be supplied strictly in accordance with that specified. Set-out oflights in ceilings shall be performed in accordance with the architectural

drawings.(i) Exit and Emergency Lighting System

A system of self contained EXIT and Emergency Lighting system shall beprovided.

(j) Lightning Protection

Supply and install a complete lightning protection system as detailed in laterclauses of this specification. Refer to separate section for full description ofsystem.

(k) Acoustics

Noise generated by electrical services into occupied spaces shall not cause thebackground noise level to increase by more than 1 dB(A) for typical use.

(l) Electromagnetic Shielding

The whole electrical system shall be designed and installed in a manner thatshall minimise electromagnetic field to adjacent work areas. Acceptablemagnetic field limit shall be 10mG at working level height.

In situations where the magnetic field is more than 10mG, due to the installedelectrical system, electromagnetic shielding in the form of ferromagnetic materialshield shall be installed to decrease the field to the acceptable level.

(m) Maintenance and Defects Liability

Fully maintain the total installation including all new works within the building fora period of 12 months, starting from date of practical completion as determinedby the Project Manager/Consultant.

Include for all testing and logging of equipment as required by the relevant Australian Standards, Codes and Local Building Authorities.


12/236




3.2

AUTHORITIES REQUIREMENTS

Electrical supply authority: Local Power Company (Cty Dien Luc TP Ho Chi Minh)

Preliminary negotiations have been made with Local Power Company by the Client. An offer of supply by Local Power Company has been received. The Sub Contractorshall continue working with Local Power Company to finalise agreement forconnection requirements. The Sub Contractor shall bear all charges associated.

3.3

SYSTEM CONTROLS AND OPERATION

(a) Description

The required minimum measurements to be provided shall be:

● Consumption (kWh)

● Voltage (V)

● Current (A)● Peak Demand (kW)

(b) Metering

Metering shall be provided at the Incoming supply

The Sub Contractor shall be responsible to co-ordinate all metering requirementswith Local Power Company.

The Sub Contractor shall allow for all metering and signal cabling works by LocalPower Company including associated charges.


13/236




4.

GENERAL REQUIREMENTS

4.1

SITE INSPECTION

Inspect the site to familiarise yourselves with the conditions thereupon prior tosubmission of tender. Confirmation of site inspection shall be submitted with tender.

4.2

STATUTORY REQUIREMENTS AND STANDARDS

Australian Standards and Codes current at the date of tendering and also referenceCodes and Standards listed in the prefaces to those Standards and Codes areapplicable in respect of all materials and workmanship except where in conflict withthe provisions of these specifications.

Where Australian Standards and Codes do not exist the appropriate British Standardor Code shall apply. Where this specification expressly requires standards higherthan or different from those applicable under the relevant Standard or Codedocuments, this Specification shall be followed.

Advise all subsequent amendments to applicable codes as they come into forceduring the work and seek a direction regarding compliance for this project.

All work shall comply with the:

● 11TCN 19-84 Ñöôøng daây ñieän – Boä Ñieän Löïc VN● 11TCN 21-84 Thieát bò phaân phoái vaø traïm bieán theá – Boä Ñieän Löïc VN● 11TCN 20-84 Baûo veä vaø töï ñoäng – Boä Ñieän Löïc VN● TCVN 2622 PCCC cho nhaø vaø coâng trình● TCVN 6160 PCCC cho nhaø cao taàng● TCXD 95:1983 Thieát keá chieáu saùng ngoaøi nhaø● TCXD 25:1991 Laép ñaët daây ñieän trong nhaø● TCXD 27:1991 Laép ñaët thieát bò ñieän trong nhaø● TCXD 46:1991 Choáng seùt cho caùc coäng trình xaây döïng

● AS 1680: Code of practice for interior lighting and visual environment● AS 1768: Lightning Protection● AS 1201: Tubular fluorescent lamps for lighting service● AS 2243-part 6: Mechanical aspects● AS 2243-part 7: Electrical aspects● AS 3000-2000 Australian Standard Wiring Rules

4.3 WARRANTIES

Warranties specified in this specification are additional to any warranties required bycurrent Industry Codes of Practice and relevant regulations

4.4

SPECIFICATION AND DRAWINGS

The drawings provided with this Specification shall be read in conjunction with thisSpecification.

The Specification and drawings are mutually explanatory, and all work called for byone, even if not by the other, shall be fully executed and completed.

The drawings shall be considered approximate and diagrammatic only. Actualdimensions shall be obtained by The Sub Contractor.

Accept the responsibility to ascertain that all particular equipment offered fits into theprovided spaces taking into consideration the requirements for maintenance and otherfactors affecting the installation.


14/236




4.5

DISCREPANCIES OMISSIONS

If any discrepancy, contradiction or omission appears in the specification or drawings,refer same to the Project Manager and Consultant for resolution before submitting aTender. The Consultant will issue directives on such matters in writing. Oralamendments to the specification shall not be recognised.

4.6 SETTING OUT OPENINGS AND MAKING GOOD

The precise location of all openings, fixings and similar items of work required forthese works to be provided by the Main Contractor shall be determined at such timesas not to cause delay to the work. All items shall be checked to ensure correctpositioning. If openings, fixings and similar items of work are wrongly located or areomitted due to incorrect or lack of information, bear the responsibility of the cost of anyremedial works.

The specification drawings are diagrammatic only and unless otherwise stated shall

not be used for determining the precise positions of equipment outlets and likefeatures. The exact location of these shall be determined on site or from shopdrawings.

All chases, ducts, recesses and penetrations in structural elements not shown on thebuilding and structural drawings shall be subject to approval.

4.7 POSITIONING OF OUTLETS AND EQUIPMENT

The layout of equipment shown on the drawings is diagrammatic only, and exactpositions shall be determined on site. Final position shall be to the approval of the Architect/Consultant. Ensure that all plant offered in suitable for installation in thelocation and spaces shown on the drawings and will be accessible for maintenance inaccordance with the manufacturer’s recommendations when installed.

Outlets shall be spaced accurately and symmetrically within rooms.

Positions of all outlets, switches and fittings shall be chalked up in areas where theoutlets are adjacent to tiles or other architectural dados. Approval of the Consultantshall be obtained before placing any final conduits or wiring for these outlets.

The position of outlets and switches shown on the drawings is assumed to be correct,however, variations of up to 2m may be effected without cost variation if the change isadvised before the outlet or switch is fitted off.

Where outlets are in close proximity they shall be aligned horizontally and/or verticallyas the case may be.

Equipment shall be symmetrically located in relation to other equipment and devices,the building module and general aesthetic treatment.

4.8

CO-ORDINATION OF INSTALLATION

Co-ordination shall be carried out to ensure that all items for installation in falseceilings are provided in sufficient time to comply with the Main Contractor’s program. All other services within false ceilings shall be completely installed so that it will not benecessary to remove any ceiling tiles to finish other work, apart from commissioning.

Responsibility and provision shall be allowed for any cost where due to delays ordeficiencies attributable to this Contract, ceiling tiles must be removed and replaced,or additional penetrations provided in the ceiling.


15/236




4.9

PERFORMANCE AND GUARANTEE

By the fact of this tendering, guarantee:

(a) The equipment offered is of the most modern and correct design andconstruction and of the necessary capacity to efficiently perform the workspecified.

(b) The equipment offered is capable of being installed in the plant space shown onthe exhibited drawing with adequate clearance for its proper operation andmaintenance.

(c) The equipment offered will provide the minimum capacities as scheduledelsewhere in this Specification or on the drawings.

(d) All the settings and limits of all control instruments and equipment shall be theresponsibility of The Sub Contractor and he shall ensure that the specifiedrequirements and conditions are met.

4.10 SHOP DRAWINGS

Prepare Shop Drawings of the proposed installation. All Shop Drawings shall besubmitted to the Principal/Consultant for approval before commencing any work. Allchecking and approval of such drawings by the Principal/Consultant shall beconstrued as gratuitous assistance and does not relieve responsibility for errors oromissions from The Sub Contractor.

Where such errors or omissions are discovered later they shall be correctedirrespective of any approval given by the Principal/Consultant. Approval of drawingsshall not be construed as authorising additional work or increased cost to theprincipal. In the event that the drawings indicate additional work involving increasedcost. Notify the Principal/Consultant at the time of submission of the drawings.

4.11

AS - INSTALLED DRAWINGS

As from the commencement of work, employ a competent draughtsman to keep arecord of all deviations and changes from the contract and workshop drawings andshall mark on a set of prints an accurate record of all work as actually installed.

During the progress of the work record on AutoCAD (latest version) files, as specified,the installations as actually built, and submit these to the Consultant for checking.Upon approval by the Consultant of these drawings provide sets of prints as specifiedelsewhere. In addition provide sets of correctly recorded diagrams, schedules ofequipment, control panels and circuits, cable tray and conduit runs and all informationregarding the installations as actually built.

In addition retain one copy of each of the "as installed" drawings and schedules foruse during the Defects Liability Period.

4.12

EQUIPMENT DEVIATIONS

The dimensions and ratings of equipment specified herein or indicated on thedrawings are intended to establish the outlines and characteristics of equipmentfurnished by the particular manufacturers specified. Should an alternative be offeredor intention to use an item of equipment other than that specified or shown on thedrawings or in the Schedule of Technical Data (Appendix B) in the Contract, apply inwriting to the Principal/Consultant and await written approval before proceeding.


16/236




Where such approved deviation requires a different quantity and arrangement ofarchitectural or structural materials, or a different quantity and arrangement of wiring,

conduit and equipment from that specified or shown on the drawings, furnish andinstall any such additional structural supports, insulation, controllers, motors, starters,electrical wiring and conduit, and any other additional materials and equipmentnecessitated by the deviation.

4.13

PACKAGED EQUIPMENT

Where packaged or unitary equipment is specified or offered against thisSpecification, such equipment shall be modified to conform with the requirements ofthis Specification, whether or not this requires modification of the Manufacturer'sstandard construction.

The fact that a particular packaged item by name have been offered shall not absolvethe requirement of modifications to meet the Specification.

4.14

SAMPLES AND PROTOTYPES

Samples of materials and items described as "to be approved" shall be delivered tosite at least 15 days before approval is required. Two samples shall be supplied ofeach item required, each one to be properly identified and marked with the suppliersname and model number. One of the samples shall be held on site, the second shallbe returned to The Sub Contractor/Manufacturer once it has been viewed andcomments have been received from the Consultant. On acceptance the samples willbe marked with date approved and by whom

Submit the following sample fittings and accessories to obtain approval of theConsultant before installation:

● Light Fittings● Power Outlets, Switches● Conduits, Cables, Cable Tray, Trunking

Arrange for the Consultant to inspect the samples to obtain approval and acceptancein writing of the offered samples.

The approved samples shall be retained on site for reference purposes untilcompletion of the work. All such materials used in the work covered by thisspecification shall conform with the approved samples.

The Consultant will be at liberty at any time to test or analyse samples of anymaterials brought onto the site and intended for these Works.

In addition to the above requirements for the production, submission and approval ofsamples and prototypes, the Main Contractor may prepare an area in advance of thegeneral construction cycle. The purpose of this area shall be to ensure co-ordinationof all services and finishes and as a display area. Provide and install all samples andprototypes required for such an area as directed by the Main Contractor.

4.15

RADIO INTERFERENCE

All equipment and/or appliances provided under this specification shall be designedso that no interference will be caused with any radio or other electronic transmitting orreceiving equipment in the same locality. In the event of the inherent characteristicsof the electrical installation being such that interference is possible, efficient devices orscreening techniques capable of eliminating such interference shall be provided at noadditional costs.

Define the areas susceptible to interference prior to the purchase of equipment andappliances and advise the Consultant of the methods to be adopted to reduce theinterference.


17/236




4.16

LABELLING

All switches, fuses, relays, terminal strips, circuit breakers and compartments shall becomprehensively labelled to clearly indicate their function.

Labels shall be of Sandwich Ivorine or Traffolyte material, white with black lettering fornormal power and white with red lettering for standby power.

Circuit breaker labels shall include base rating and protection setting.

Submit all label schedules for approval prior to manufacture.

The labels on switchgear protecting outgoing circuits and sub-mains greater than6 sq.mm per phase shall include the cable size, number of cores and cable type.

Labels for fuse combination units shall include both fuse rating and frame rating.

Each power outlet shall be engraved or fitted with a means of identification, indicatingthe circuit protective device and the distribution board to which the switch or outlet is

connected. In the case of metal-clad power outlets, or equipment isolators, thismeans of identification shall be 5mm uppercase engraving red filled or an ivorinelabel, screwed to the metal casing of the switch or outlet, the label to be 10mm widewith 5mm lettering (white) on a black background.

For outlets and equipment other than metal-clad, engraving shall be 3mm uppercasered filled or circular tag labels equal to those referred to as "IPA studs".

Where consumer main and sub main cables enter and leave trays, racks, troughs orducts along their route length and at each end they shall be labelled according to thecable schedule, or as directed with stamped aluminium or brass tags attached withnylon straps or other approved means. Such straps shall be used to tie togethersingle core cables of the one circuit.

Where extra low voltage dichroic lamp luminaires are used within the installation alabel shall be attached to each switchboard stating the following, "Warning: Ceilingmounted recessed extra low voltage lighting fittings are installed in these premises. Inorder to avoid the risk of overheating they MUST NOT be covered by thermalinsulation".

4.17

WORKMANSHIP AND MATERIALS

Provide skilled and expert labour as necessary to carry out the work in the bestpossible manner. The quality of workmanship shall be of first grade and inaccordance with the highest standards of the respective trades. Workmanship of poorquality or of an unacceptable standard will be rejected by the Consultant and must bereplaced at no extra cost to the Owner/Principal with workmanship of the requiredstandard.

All materials, fittings, accessories and apparatus are to be of first grade design andmanufacture and are to comply with the relevant British and/or Australian standard

specification. All materials, fittings, accessories and apparatus shall be new and shallbe of current model and design unless specified otherwise. Submit for the approval ofthe Consultant prior to commencing installation, a list of all accessories, fittings andapparatus which it is proposed to employ in the work, and only such items as havebeen approved may be installed. Failure to comply with this provision will result in theunconditional rejection of such items when inspected on site.

Where directed by the Consultants "approved" samples shall be kept on site. Eachitem of equipment shall be a standard catalogue product of an established, reputable,approved manufacturer. All similar equipment shall be of the same manufacture,type, class and finish, unless otherwise specified.


18/236




Where manufacturers catalogue numbers or types are specified or shown on thedrawings, they are generally intended to be used as a guide, and are not intended to

take precedence over the basic duty and performance specified or shown. In allcases, verify the duty with the particular characteristics of the equipment offered forapproval.

Where no alternative materials are noted in the specification or on the drawings andwhere the words "equal", "approved equal", "as approved" etc do not appear, theexact make specified must be furnished and installed. No alterations will be permittedin the lists of manufacturers and suppliers submitted within Tender or subsequentlywithout the written approval of the Consultant.

Should materials and/or equipment other than by the approved manufacturer orsupplier, be installed, such items may be rejected on site. All such rejected itemsshall be removed from the site as soon as possible and be replaced by approveditems at no cost to the Principal.

The replacement of any such items shall not constitute grounds for any variation or

any extension of time.

Take every care to avoid damage to fittings, surfaces and equipment in the premises. Any damage caused shall be made good at no additional cost.

4.18

POWER FACTOR, BALANCING VOLTAGE DROP

Ensure and be responsible for the final installation having:

● An overall power factor within acceptable limits

● Been balanced over the three phases and

● A voltage drop within acceptable limits

● All of the above to the satisfaction of the Local Power Company.

4.19 EARTHING

Earthing of the complete electrical installation shall be strictly in accordance with therequirements of the SAA Wiring Rules, and the special requirements of thespecification and the Local Power Company.

Earth conductors, excepting earth conductors in insulated and sheathed cables, shallbe of annealed stranded copper of a size not less than 2.5m2. and shall be insulatedand enclosed in conduit with the respective circuit wiring. Earth conductors ininsulated and sheathed cables shall be a minimum of 2.5m2.

The whole of the system shall be mechanically and electrically continuous throughout.

All general purpose power outlets and light fittings shall be earthed.

4.20

COLOUR CODING

The correct phase colour for each active conductor shall be extended throughout allcircuits.


19/236




5.

24KV – MEDIUM VOLTAGE SWITCHGEAR

The medium voltage switchgear shall be of the Indoor Metal-enclosed WithdrawableVacuum Circuit Breaker type suitable for operation in the location as indicated in thespecification and drawings.

All equipment and materials must be designed, and produced, tested andcommissioned in conformity with the lasted publications of IEC and ISO Standards.

Ambient temperatures:

Maximum: 45oC

Average relative humidity: 85%RH

Maximum relative humidity: 100%RH

The medium voltage distribution system shall incorporate vacuum circuit breakers forboth incoming and outgoing feeders

System requirements:

Rated voltage: 24kV

Maximum lightning impulse withstand voltage: 170kV

Power frequency withstand voltage: 70kV (1min)

Short time current: 25kA/1s

System frequency: 50Hz

Minimum creepage distance: 25mm/1kV

Degree of protection: Indoor IP4X

Auxiliary supplies: 220V AC – 220V DC

Refer appendix B for full technical specification.

6.

POWER TRANSFORMER

6.1 GENERAL

Provide dry type cast-resin 22kV/0.4kV 50Hz 4W 3P Power Transformer inaccordance with the drawings and this specification.

Transformers shall be explosion resistant, fire resistant, of dry type construction,tropicalised and rodent proof.

The transformers shall be suitable for installation within ventilated enclosure andsuitable in every way for operation on the system and under the conditions specified.It shall be possible to dismantle the windings from the core for lifting separately to thetransformer location where the core and windings will be assembled, tested andcommissioned.

Transformers enclosure and busbar transition compartments shall have adequatemeans of access for maintenance and inspection.

6.2

RATING

Power transformers feeding groups of motors shall be capable of withstandinginfrequent restarting loads of up to 1.2 times the transformer rated current. Two suchrestarts may take place in succession at 5 seconds interval.

Transformers shall be capable of delivering rated current at applied voltages equal to90% and 110% of the rated voltage.

The impedance voltage shall be as stated in the Contract Documents.


20/236




Transformers provided with AF cooling shall have guaranteed power output ratings atleast 30% above the AN rating within the specified enclosure. Rating calculations

shall be provided for AN and AF cooling under various ambient temperatures.

6.3 CORES

(a) Core Material

Transformers provided with AF cooling shall have guaranteed power outputratings at least 30% above the AN rating within the specified enclosure. Ratingcalculations shall be provided for AN and AF cooling under various ambienttemperatures.

(b) Core Construction

All transformer cores shall be fabricated from non-aging, cold-rolled, grain-oriented, high permeability silicon steel or other approved steel having low-losscharacteristics.

The magnetic circuit shall be of core construction design to avoid staticdischarges and the development of short circuit paths within itself or to theearthed clamping structure. Mitred joints between cores and yokes shall beemployed on all sizes of transformer in which this technique is practicable. Allcore laminations shall be free of burrs and stacked without gaps.

All parts of the core shall be of robust design capable of withstanding mechanicalshocks. Bracing of the core and winding assembly must be adequate to preventdistortion during normal lifting, transportation and handling of the transformer.

All structural members of the assembled cores shall be of steel except whenconventional core-bolt clamping is replaced by an approved taping or banded-clamping technique.

Adequate fixtures shall be provided for l ifting the core and windings separately.

All structural steel shall be adequately painted before being built into thestructure. Any non-magnetic or high-resistance alloy included in the design shallbe subject to approval.

Core laminations shall be specially treated to avoid moisture ingress andconsequent core corrosion.

(c) Core Insulation

Individual laminations shall be insulated with material which will not deterioratedue to the action of pressure.

The magnetic circuit shall be earthed. With the earthing removed, the magneticcircuit shall be insulted from the clamping and supporting structure and allstructural parts, and shall withstand the test specified.

An insulation Class F with a maximum temperature rise of Class B (80K) inaccordance with IEC 76-2 is to be provided.

(d) Core Earthing

All metal parts of the transformer except individual core lamination, core boltsand side-clamping plates shall be maintained at earth potential.

The magnetic circuit shall be earthed to the clamping structure through oneremovable core-insulation-test link only, placed in an accessible position.

Magnetic circuits having an insulated sectional construction shall be providedwith a separate link for each individual section and the arrangement of theconnections shall be subjected to approval.


21/236




(e) Core Flux Density

The maximum flux density in any part of the core and yokes at normal ratio,

frequency and voltage shall not exceed 1.6 Telsa.

6.4

WINDING

(a) HV Coils

The conductor materials used for the high voltage winding shall be either roundor rectangular enameled copper wire. The enamel coating used, which also formthe turn-to-turn insulation, must be suitable to be used for an insulation system

with thermal class H (Max. temperature 180°)

The HV windings are to be would using a multi-layer technique to minimiseoscillations due to lightning and impulse voltages. The insulation must bedesigned to fulfill the requirements with regard to partial discharge, as laid downin the section covering test.

To achieve a coil, totally sealed and protected against moisture the conductors(enamel wire) must be reinforced by glass-fibre. After which the winding shall becast fully under vacuum with epoxy resin to ensure complete void-free resinimpregnation throughout the entire insulation system. The content of glass-fibreshall be equal to or higher than 70% and shall be evenly distributed. Thisreinforcement with glass-fibre is vital to establish to mechanical strength in bothaxial and radial directions. Furthermore, this will ensure a high level or shortcircuit withstand and avoid the possibility of any cracks caused by mechanicalstresses due to temperature variations, or sudden load peaks.

(b) LV Coils

The conductor material used for the low voltage winding shall be rectangularcopper wire or copper foil. Copper wire shall be restricted to use in windings witha max. rated current of 1kA.

To improve the short circuit strength it is essential with higher currents, that thewindings are made using foil windings. When the low voltage coils are madeusing foil windings, the width of the foil conductor shall be equal to the length ofthe final coil.

The low voltage foil-winding shall be protected and reinforced using glass-fibrefabrics that are impregnated using a resin material. The winding shall be castfully under vacuum with epoxy resin to ensure void-resin impregnation throughoutthe entire insulation system. During the later polymerization process, this resinwill soften and be cured to permanently bond the conductors together to form asolid block, able to resist to radial short circuit forces.

(c) Current Density

In order to avoid excessive heating in case of a short circuit, the current density

shall be limited to fulfill the requirements as laid down in the section coveringfault conditions.

(d) Winding Clamping and Bracing

The primary windings shall be encapsulated with polyester resin using a vacuumpressure impregnation (VPI) process for maximum penetration of the resin. It isnot necessarily a part of the insulation system. The secondary winding shall beeither vacuum cast or vacuum pressure impregnated.

Windings shall be designed to reduce to a minimum the out-of-balanceelectromagnetic forces in the transformer at all voltage ratios.


22/236




Windings and connections shall be adequately braced to withstand mechanicalshocks and electro-magnetic impulsive forces which may occur during handling,

transportation and transient-current surges.The stacks of windings shall receive adequate shrinkage treatment before finalassembly.

Clamping of the coil assemblies shall be of approved material and be arranged toprevent deterioration of the core characteristics.

(e) Winding Insulation

Insulation of windings and connections shall be free from insulating compositionsliable to soften, ooze out, shrink or collapse during service. The windinginsulation shall be Class F.

All windings shall be fully insulated as defined in IEC 76.

All neutral points or star or inter-star windings shall be insulated for the voltagesspecified.

All insulation materials used either individually or in combination with other shallbe suitable for use with transformers, with an insulation system temperature of

155°C. The HV and LV windings shall be reinforced with glass fibre.

The need to reinforce the resin materials with glass fibre is essential to preventthe resin from cracking under the most severe temperature variations, over thetotal life-time of the transformer. This requirement shall be verified by means ofthe severe thermal-shock test, described in the section on insulation crackresistance.

(f) Insulation Fire Behavior

The insulation materials used shall be classified as ‘flame retardant’ according tothe IEC recommendation IEC 92-1, Electrical Installation in ships.

The amount of material that can bum shall be held to the absolute minimum, andin no case shall this exceed a value equal to more than 5% of the totaltransformer weight.

(g) Insulation Crack Resistance

The tenderer must show in his tender that he has design and research facilitieswhich have investigated and eliminated the risk of cracks in the epoxy insulation.Furthermore, the tenderer shall state in his tender that the transformers in hisoffer are able to withstand nothing less than the following severe thermal shock-test.

A test carried out on a complete set of transformer cools rated not less than1000kVA and typical of the whole design series. The coils shall be dippedalternatively 6 times into tanks of boiling and freezing water.

Each submersion shall not be less than 2 hours, making a total submersion timeof not less than 12 hours.

The transfer time from the tank containing boiling water to the containing freezingwater and vice versa shall not last more than 2 minutes. On completion of theabove cycle, a visual inspection for cracks shall take place, and the dried outcoils shall complete a partial discharge test.

A certified test report shall be presented to the Principal/Consultant.


23/236




(h) Insulation Levels

The HV windings shall be designed for a short duration power frequency testvoltage, and a lightning impulse-withstand voltage of negative polarity with awave shape of 1.2/50 M secs. According to list 1 or list 2 of table V, IEC 726.

The LV winding shall be designed for a short duration power frequency testvoltage of 3 kV for windings with rated voltages up to 1.1 kV, the test voltage areas specified below:

For general distribution of power in public or industrial system the insulationlevels shall be the following:-

Highest voltageFor equipment

Um (r.m.s)

Rated shortduration power

frequency (r.m.s)

Rated Lightning impulse withstandvolt. (BIL)

(KV) (KV) List 1 (KV) List 2 (KV)

12 28 60 75

17.5 38 75 95

24 50 95 125

35 70 145 170

(i) Short Circuit Impedance

Transformers for highest voltage for equipment up to and including 12 kV, theshort circuit impedance shall be 4% for power ratings up to and including 400kVAand 6% for power ratings from 500 kVA up to and including 4500 kVA.

(j) Fault Conditions

The transformer shall be capable of withstanding, on any tapping and withoutdamage, the thermal and dynamic effects of externals short circuits inaccordance with the conditions specified in IEC recommendation 76-5. Thetransformer shall be designed to carry the full short circuit current for a period ofthree seconds when operating at full load and the highest permissible, ambienttemperature, without exceeding the temperatures laid down in the IECRecommendation IEC 76-5.

(k) Temperature Rise

When the transformers are loaded at their rated current and under steady loadconditions, the temperature rise of the windings measured by resistance shall not

exceed 100°C under normal conditions and with natural air cooling (AN).

The amount of cooling air required for safe operation at full load, and under worsttemperature conditions shall be clearly stated in the tender.

(l) Terminals

(i) HV and LV Terminals

The HV and LV terminals shall be located on opposite sides of the upperpress beams of the transformer. The neutral terminal shall also be on theupper press beam for LV currents up to and including a rated current of1800 Amps above this, the neutral terminal shall be on the lower pressbeam. The terminals shall be securely positioned using suitable insulatorsfastened to the press beams.


24/236




The terminals shall be suitable for connection of cables coming from aboveor below. The HV terminals shall be galvanised metric studs of sufficient

mechanical strength, and able to accept standard cables lugs.The LV terminal shall be metal flags dimensioned to take the rated current,suitable for connection to either busbars or standard cable lugs.

All terminals shall be dimensioned to accept the quantity and sized ofcables stated in the drawings.

(ii) Earthing Terminal

Two earthing terminals are to be provided, located diagonally opposite oneither side of the undercarriage. Both terminals shall be made fromstainless steel and have M 12 threads.

(m) Winding Connections

The transformer windings shall be connected in accordance with the IEC groupof symbols.

The star-point shall be brought out and connected via insulated busbar to theneutral earthing bar. Earthing shall only take place at the transformer end.

(n) Winding Ratio

The ratio of voltage between phases on the higher and lower voltage windings ofeach transformer measured at no-load shall be those stated in the ContractDocuments.

6.5

UNDERCARRIAGE

Each transformer shall be equipped with 4 rollers. These rollers shall be adjustablefor either transverse or longitudinal movement, and equally spaced in both direction.The undercarriage shall be sufficiently sturdy to permit the use of crowbars etc. placeagainst it during movement to the transformers final location.

6.6

OVERLOAD PROTECTION

The transformer shall be equipped with the temperature monitoring system. Thismonitoring system must consist of four sets of PTC thermostat sensors embedded inthe low voltage windings for the following functions:

Alarm signaling

Tripping signaling

Continuous temperature indication

Forced-air cooling

Each set of sensor shall be connected in series to solid state temperature controller. A delay-time relay shall be incorporated into the system such that in the event of a

trip, the transformer cannot be switched on until the sensor temperature has dropped6K below the release value.

The continuous temperature indication shall be provided with the terminals connectedto the marshaling box for BAS monitoring – under BAS contract.

For forced-air cooling, a 30 min. time delay relays shall be installed for fan control.These sensors shall activate the fan control at 20K below the alarm temperaturesetting, and switch off the fan after the temperature has fallen below that temperature. All auxiliary devices required for automatic and manual fan control shall be included.Manual fan control shall be included. Manual fan control shall override the automaticcontrol at the transformer location.


25/236


26/236




6.11

OFF-CIRCUIT TAP CHANGING

Off-circuit tapping range is as follows:-

Plus tapping - 2.5% and 5%

Main tapping - 0%

Minus tapping - (-) 2.5% and (-) 5%

Off-circuit tapping shall be provided on the higher voltage windings for a variation ofno – load primary voltage as specified.

Off-circuit tap-changing shall be carried out by means of internal accessible links andshall be tamper-proof complete with a protective covering.

The terminal numbers corresponding to the tapping position shall be cast or engravedin a metal indication plated fixed to the transformer case.

6.12

WINDING TEMPERATURE MEASUREMENT AND INDICATION

Winding temperature indication and protection shall be provided for each limb of eachtransformer.

The winding temperature shall be determined at least one location in each LV windingby means of interchangeable thermistors sensors and relay unit. The leads of thesethermistors shall be brought out into a terminal box located on the front lower part ofthe transformer enclosure. The relay unit shall be located in the box and all cablesshall be heat resistant. Fie N.O. (normally open) and one N.C. (normally closed)contacts of 5A continuous thermal rating shall be provided. One for starting the fan,one for alarm, one for protection tripping purpose, one for remote monitoring ofwinding temperature alarm and two for fan ON/OFF indication.

The thermistors shall be of the positive temperature coefficient (PTC) type and besupplied complete with auxiliary equipment by the transformer manufacturer under his

full guarantee.

The thermistors shall be located such that no over voltage protection devices arerequired.

Temperature indicator shall be in the form of dial-type indicator calibrated in degreeCentigrade and be fitted with a hand-reset pointer to register the highest temperatureattained. The indicator shall be mounted on the transformer enclosure such that it isclearly visible from the front. The indicator shall have two change-over contacts of atleast 1A continuous thermal rating.

6.13 AIR FORCED COOLING (AF)

All transformers must be fitted with crossflow fans. The fans shall have low noiselevel and shall allow the transformer to be used for long periods of overload within thetemperature limits complying with IEC 726 and IEC 76. They shall be automatically

controlled by thermal sensor circuits. Fans shall be installed on both sides and boltedfirmly to the transformer base within the transformer enclosure.

Power supply to fan motors shall be 240V single-phase AC derived from the outputterminal of the transformer through HBC fuses fitted in a cubicle supported on theframe of the enclosure. Cables shall be heat resistant.

6.14

MINIMUM AIR CLEARANCE

The transformer terminals shall have minimum external clearances in air inaccordance with IEC.


27/236




6.15

TERMINALS AND CONNECTIONS

Transformers shall be equipped with busbar for the HV phases and busbar trunkingfor the LV phases and neutral. The busbars shall be suitably spaced and positionedfor connection to the flange end of the busway system. Coordination shall be madewith the HV isolator switch and LV main Switch-Board manufacturer. Terminalmarkings shall comply with IEC 616.

6.16

TERMINAL MARKING, RATING PLATES, DANGER/WARNING SIGNS

The terminal marking plate shall show an plan view of the terminals with thecharacters of terminal markings in accordance with IEC 76. It shall also show thetappings in a tabulated form.

The rating plate shall indicate the following:-

(i) Manufacturer’s name and address

(ii) Transformer specification reference

(iii) Ratings in kVA (AN/AF)

(iv) Volts at no-load and normal tapping:-

High voltage

Low voltage

(v) Current at rated load and normal tapping:

High voltage

Low voltage

(vi) Number of phases

(vii) Frequency

(viii) Vector of phases

(ix) Type of cooling

(x) Impedance voltage at normal tapping and 75oC

(xi) Insulation level

(xii) Mass of core in kg

(xiii) Mass of windings in kg

(xiv) Total mass in kg

(xv) Manufacturer’s serial number

(xvi) Year of manufacture

(xvii) Maximum temperature rise in windings in oC.

The terminal markings and rating plates shall be of a durable and corrosion resistantmaterial and its markings shall be permanently legible. The two plates may becombined into a single plate.

An appropriate danger sign shall be installed on each winding.

High voltage warning signs with the voltage level clearly stated shall be installed on allremovable covers.


28/236




6.17

ACCESSORIES

Transformers shall be provided with the following standard accessories:-

Lifting lugs

Jacking pads

Earthing terminal

Rating and terminal marking plates

Dial type thermometer on each winding (located away from open HV bushingterminals)

Thermistors in each winding and relay complete with five sets of contacts

Wheel base

Anchor bolts

6.18 FINISHING AND PAINTING

All metal structures and sheet steel shall be adequately protected against corrosion.Preparation of surfaces for painting shall be made complying with BS 7079. All millscale, loose rust and welding slag, shall be removed by hand tools and the metalsurfaces shall be cleaned free from dirt, oil, grease, wax and other contaminants.

The sheet steel shall be zinc phosphate treated to a minimum thickness of 3.0m/m2prior to the application of paint.

The manufacturer’s standard is acceptable, if at least equivalent to using theelectrostatic spray process and oven-baked with:-

One coat of stoving primer (zinc epoxy primer) of minimum thickness 30microns.

One coat of melamine resin paint of minimum thickness 30 microns.

One final top coat of melamine paint of minimum thickness 15 microns.

Alternatively, the metal surfaces shall be coated with a layer of weather resistant paint(epoxy polyacrylic for primer and top coat) via cathodic electro deposition process.The dry firs thickness shall be at least 35 microns.

All panels shall have a consistent and matching paint finish. The final top coat colourshall be light grey or manufacturer’s standard colour subject to Owner/Consultant’sapproval.

The assembly shall be treated in all respects to provide a lasting durability under thespecified service conditions.

Repair painting shall be done when there is development of any detrimental firmirregularity, such as lifting, loose, cracked, brittle or non-adherent paint ordiscoloration after completion of painting.

The equipment supplier shall submit detail of his painting system and procedures forreview and approval by the Principal/Consultant.


29/236


TE