amendment for procurement of design, supply, installation,...

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Amendment for Procurement of Design, Supply, Installation, Testing & Commissioning of 132/33kV, 50/75MVA Transformer, 33kV Vacuum Circuit Breaker & Related

Accessories for Shikalbaha 60 MW Power Station, BPDB, Chittagong, Bangladesh

Amendment No-1

Tender Ref. No.: Pur - 310/2017 Dated: 12/03/2017 Name of Tender: Procurement of Design, Supply, Installation, Testing & Commissioning of 132/33kV, 50/75MVA Transformer, 33kV Vacuum Circuit Breaker & Related Accessories for Shikalbaha 60 MW Power Station, BPDB, Chittagong, Bangladesh

The following clauses of the tender document will be amended as below- Sl no.

Clause no. Mentioned as per tender document

Amended as

1. Preparation of Tender TDS: ITT 21.1(q) and Rejection Clause 10

Tenderer shall have to submit Type Test Report of offered 50/75 MVA, 132/33kV or higher capacity transformer, 33kV Vacuum Circuit Breaker from the manufacturer along with the offer.

Tenderer shall have to submit Test Reports of offered 50/75 MVA, 132/33kV or higher rating transformer, 33kV Vacuum Circuit Breaker from the manufacturer along with the offer (as per mentioned in Clause 7.13 of Section-7)

2. Preparation of Tender TDS: ITT 26.1(b)

Manufacturer’s authorization is: Required.

Manufacturer’s Authorisation Letter is required for the following items listed in Section 6: Schedule of Requirements:

All items

Manufacturer’s authorization is: Required.

Manufacturer’s Authorisation Letter is required for the following items listed in Section 6: Schedule of Requirements:

All items. But for Protective Relays of 33KV breaker PCM Manufacturer's authorization will be required from SIEMENS (Germany/Switzerland)/ ABB (Switzerland/Finland/Sweden)/ Schneider (UK/France)/ NR China/ Alstom UK/France and for On-Load Voltage Control Equipment of the Transformer Manufacturer's authorization will be required from MR, Germany/ ABB, Sweden/ HM, China

3. Price Schedule for Goods (Form PG4-3B)

As per attachment-1

4. Price and Completion Schedule - Related Services (Form PG4-3D)

As per attachment-1

5. Specifications Submission and Compliance Sheet (Form PG4-4)

As per attachment-1

6. Section 6: Schedule of Requirements

As per attachment-1

7. Section 7: Technical Specifications

As per attachment 1

N.B. All other terms and conditions of Tender document will remain unchanged.

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Attachment-1 (Page2-36)

Price Schedule for Goods (Form PG4-3B) [Group B Tenders: Goods Manufactured outside Bangladesh, to be imported]

Invitation for Tender No: Date: Tender Package No: Package Description: [enter description as specified in Section 6] Tender Lot No: Lot Description: [enter description as specified in Section 6]

1 2 3 4 5 6 7 8 9 10 11 Line Item No .

Description of Item Manufacturer's Type/ Specifications

Country of

Origin

Unit of Measurem

ent

Quantity Unit price CFR (Cost Plus

Freight) [insert port of destination]

[FC]

CFR price per Line

Item (Col. 6 × 7)

[FC]

Inland transportation, Port Handling Charges and

others [Taka]

VAT Payable on account

of Supplier if the Contract is awarded

[Taka]

Total Price per line item

FC (Col. 8)

Taka (Col. 9)

1 Power Transformer 132/33kV, 50/75MVA, 3-Phase Power Transformer

Set 01

2 33kV C.T. 800/1200/1600/5 Set (03 Nos)

01

3 33kV VCB 1600A Set 03 4 Gantry Structure 1m:1m:3m (12 Set) &

1m:1m:4m (08 Set) Lot 01

5 Control Cable 4rm and 2.5rm Lot 01 6 Conductor ACSR Martin Lot

(2.5km) 01

7 PCM panel for 33kv Breaker

As per mentioned in Section:7 Technical specification

set 03

Note : Price offered in foreign currency (FC) & Bangladesh Taka Total Price for Lot Point of Delivery as per Schedule of Requirement: Shikalbaha 60MW Power Station Store. Period of Delivery including

Design, Supply, Installation, Testing & Commissioning as per Schedule of Requirement:

180 Days from L/C opening date

*If any agency commission is granted to the Local agent, it should be included in the unit price. Name: [insert full name of signatory] Signature with Date and Seal

In the capacity of: [insert designation of signatory] [ Sign]

Duly authorised to sign the Tender for and on behalf of the Tenderer

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Price and Completion Schedule - Related Services (Form PG4-3D) Invitation for Tender No: Date: Tender Package No: Package Description: [enter description as specified in Section 6] Tender Lot No: Lot Description: [enter description as specified in Section 6]

1 2 3 4 5 6 7 8 9

Service No.

Description of Services (excludes inland transportation and other services required in

Bangladesh to convey the goods to their final destination)

Country of Origin

Unit of Measurement

Quantity Unit price of service

[FC] or [Taka]

Price per line item of service

(Col. 5 X Col. 6) [FC] or [Taka]

VAT Payable on account of Supplier if

the Contract is awarded

[Taka]

Total Price per line item of

service (Col. 7)

FC

Taka

01 Necessary Civil Works (Modification of Existing Transformer PAD, Bus bar connection and structure for 3 nos 33 kv VCB)

Lot 01

02 Installation, Testing & Commissioning

Lot 01

Note Price offered in foreign currency (FC) & Bangladesh Taka Total Price for Lot

Point of Delivery as per Schedule of Requirement: Shikalbaha 60MW Power Station Store.

Period of Delivery including Design, Installation, Testing & Commissioning as per Schedule of Requirement: 180 Days from L/C opening date

Name: [insert full name of signatory] Signature with Date and Seal

In the capacity of: [insert designation of signatory] [ Sign] Duly authorised to sign the Tender for and on behalf of the Tenderer

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Specifications Submission and Compliance Sheet (Form PG4-4) Invitation for Tender No: Date: Tender Package No: Package Description: [enter description

as specified in Section 6]

Tender Lot No: Lot Description: [enter description as specified in Section 6]

132/33kV, 50/75MVA Transformer, 33kV Vacuum Circuit Breaker & Related Accessories for Shikalbaha 60 MW Peaking Power Plant, BPDB, Chittagong,

Bangladesh.

Guaranteed Technical Data

A) 3 –Phase Power Transformer

Sl. No. Description Unit

Technical Data/ BPDB's requirement

Technical Data to be filled up by tenderer/

manufacturer 1.1 Continuous Rating - ONAN 50 MVA 1.2 ONAF 75 MVA

1.3 Overall Dimension (LxWxH) To be

mentioned

2 Voltage ratio at No-Load HV/LV kV 132/33 3 Tap Changer

3.1 HV Tap Changer (On Load Type) Tapping Range +10% to -10%

3.2 Size of tapping step 1.25% 3.3 No. of Steps +/-8

4 Type of System Earthing Effectively

Earthed

5 Bushing Material Porcelain

6

Type of Base On wheels with adequate size

and approx.10m

lengths of rails and fixing

arrangement.

7 Direction of Normal Power Flow HT-LT 8 Vector Group Dyn1 9 On-Load Voltage Control Equipment:

9.1 Type

On load auto regulation and

remote & manual control

9.2 Manufacturer MR, Germany/ ABB, Sweden/

HM, China

9.3 Range % +/-10%

9.4 Size of Steps % 1.25

9.5

Power frequency withstand test voltage (BS.4571) between: first and last contacts of the selector switch between any two adjacent contacts of the selector between

kV rms 275

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manufacturer open diverter switch contacts

9.6 Type test certificate reference To be submitted

10 Type of cooling ONAN/ONAF

11 Winding temperature rise at CMR under service conditions stated in Schedule of Technical Requirement

0C To be mentioned

12 Top oil temperature under service conditions stated in Schedule of Technical Requirement

12.1 CMR 0C To be mentioned

12.2 ONAN Rating 0C To be mentioned

13 Maximum hot spot temperature in core at rated power

0C ~114

14 Maximum hot spot temperature in winding at rated power

0C ~115

15 Temperature gradient at rating specified 0C 20 approx.

16 Core Manufacturer’s Name & Address To be

mentioned

17 Material of core & grading To be

mentioned

18 Core Loss/ Kg, supported by Characteristic Curve (to be submitted )

To be mentioned

19 Thickness of core, mm To be

mentioned

20 Core Dia, mm To be

mentioned

21 Total weight of core, Kg To be mentioned

22 Flux density in iron at normal voltage and frequency and at normal ration (No load)

22.1 Cores Tesla < 1.7

22.2 Yokes Tesla < 1.7 22.3 Volts/Turn V ~120

23 Magnetising Current (Approx.) at nominal ratio and

23.1 at 0.9 x nominal voltage % ~0.1

23.2 at 1.0 x nominal voltage % ~0.2

23.3 at 1.1 x nominal voltage % ~0.4 23.4 at 1.2 x nominal voltage % ~0.5

24 Harmonic component of magnetising current at rated voltage as percentage of fundamental

24.1 Fifth harmonic % To be mentioned

24.2 Seven harmonic % To be mentioned

25 No-Load Loss at rated voltage, ratio and frequency kW 26~32

26 Load Loss (excluding cooling fan losses) at 750C and at rated voltage, ratio (nominal tap), frequency, 75 MVA & at ONAN

kW To be mentioned

27 Load Loss (excluding cooling fan losses) at 750C and at rated voltage, ratio (nominal kW 225~275

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manufacturer tap), frequency, 75 MVA & at ONAF

28 Auxiliary loss (Cooling fan losses) at 75 MVA (Total power input to fans for operation of total installed cooling capacity)

kW To be mentioned

29 Total loss at 750C and normal ratio and 75 MVA (Sl.No. 21+23+24) kW To be

mentioned

30 Regulation at 750C and normal ratio - 30.1 At unit power factor % % ~1.05 30.2 At 0.8 lagging power factor % ~7.91

31 Impedance voltage at 750C and CMR between HV & LV windings

31.1 at extreme minus tap % To be mentioned

31.1.1 at normal tap % ~12

31.1.2 at extreme plus tap % To be mentioned

31.2 Maximum Impedance over tapping range To be mentioned

31.2.1 corresponding tap To be mentioned

31.3 Minimum Impedance over tapping range % To be mentioned

31.3.1 Corresponding tap To be mentioned

32 Equivalent circuit zero sequence impedance:

32.1 HV - LV ~10.2

33 Maximum current density in windings at C.M.R.

33.1 HV Winding A/mm2 To be

mentioned

33.2 LV Winding A/mm2 To be

mentioned

34 Noise Level dB As per IEC

60551

35 Types of Transformers (Shell or core) Core 36 Core steel

36.1 Type

CRGO(Cold Rolled Grain Oriented Silicon Steel)

36.2 Grade M4 or Superior grade

37 Types of winding

37.1 HV To be mentioned

37.2 LV To be mentioned

38 Copper Conductor's Manufacturer Name & Address

To be mentioned

39 Material of windings - copper 40 Winding resistance of :

40.1 H.T. winding, Ohm. To be

mentioned

40.2 L.T. winding, Ohm. To be

mentioned

41 Current density of : 41.1 H.T. winding, Amps/sq. mm A/mm2 To be

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manufacturer mentioned

41.2 L.T. winding, Amps/sq. mm A/mm2 To be

mentioned

42 Outer, Inner & Mean dia of copper winding:

42.1 H.T. winding, mm To be

mentioned

42.2 L.T. winding, mm To be

mentioned

43 Size of Copper conductor/bar :

43.1 H.T. winding SWG, dia. in mm / area in mm2

To be mentioned

43.2 L.T. winding SWG, area in mm2 To be

mentioned

44 Number of Turns :

44.1 HT winding. nos. To be

mentioned

44.2 LT winding nos. To be

mentioned

45 Copper weight of windings :

45.1 HT winding Kg To be

mentioned

45.2 LT winding Kg To be

mentioned

46 Insulation of

46.1 HV Winding To be mentioned

46.2 LV Windings To be mentioned

47 Insulation of

47.1 Yoke bolts To be mentioned

47.2 Side plates To be mentioned

48 Safe working temperature of core plate insulation

0C 125

49 Winding connections brazed or cripmed To be mentioned

50 For fault with zero impedance external to the transformer and infinite system

50.1 Maximum axial force kN To be mentioned

50.2 Maximum tensile stress in winding N/m2 To be mentioned

51 Is facility provided for adjustment of axial pressure on windings Yes/No To be

mentioned

52 Thickness of transformer tank

52.1 Sides mm To be mentioned

52.2 Top Plate mm To be mentioned

52.3 Bottom Plate mm To be mentioned

52.4 Vacuum withstand capability of the tank 52.4.1 Main tank Kpa To be

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manufacturer mentioned

52.4.2 Conservator Kpa To be mentioned

52.4.3 Radiators Kpa To be mentioned

52.5 Provision of tank earthing Nos

53 Material used for gaskets for oil tight joints To be mentioned

Radiators, Valves, Fans

54 Thickness of radiator plates mm To be mentioned

55 Valve type/material:

55.1 100mm and below To be mentioned

55.2 Above 100mm To be mentioned

56 Equipment for ONAF + Cooling state (A) 56.1 Radiators on main tank Yes

57 Number of coolers/radiators or cooler banks per transformer To be

mentioned

58 Number of air blowers per transformer To be mentioned

59 Speed of air blowers rpm To be mentioned

60 Rating of each air blower motor To be mentioned

61 Starting current of each air blower motor A To be mentioned

Oil Volumes and Weights

62 Total oil required including cooler system Litres To be mentioned

63 Volume of oil to fill transformer to above the top yoke Litres To be

mentioned

64 Total volume of conservator Litres To be mentioned

65 Weight of active copper Tonnes To be mentioned

66 Weight of active iron in core Tonnes To be mentioned

67 Weight of core and winding assembly Tonnes To be mentioned

68 Weight of each cooler bank complete with oil if mounted separately from transformer Tonnes To be

mentioned

69 Total weights of complete transformers, including attached coolers, voltage regulating equipment, all fittings and oil

Tonnes To be mentioned

70 Weight of transformer arranged for transport Tonnes To be

mentioned

71 Manufacturer, type and class of oil to IEC 296

Class-1 grade, insulating

mineral oil, free from PCB

(polychlorinated biphenyl)

72 Drawing and manuals 2 copies To be

submitted with Transformer

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B) Bushing Current Transformer: Sl. No. Description Unit Technical Data/ BPDB's requirement


manufacturer Transformer bushing

insulators 132 kV 33kV Neutral

1 Maker

To be mentioned

To be mentioned

To be mentioned

2 Insulator materials (Solid, oil papner etc)

Oil paper Solid Solid

3 Maker's type reference and rated voltage

To be mentioned

To be mentioned

To be mentioned

4 Rated current 800 2000 2000 5 BCT particulars

5.1 HV Side Core 1.2 & Core 3 Core 1 & 2:

600-400/5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter

5.2 LV Side Core 1.2 3 & Core 4 Core 1 & 2:

2400-1600/5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter Core 4: Ratio, burden & accuracy class to be matched with LDC meter

5.3 Neutral Core 1 & 2 Core 1 :

2400-1600/5A CL: 5P20 30 VA Core 2 : 2400-1600/5A CL: 5P20 30 VA

6 Manufacturer of Porcelain

To be mentioned

To be mentioned

To be mentioned

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Sl. No. Description Unit Technical Data/ BPDB's requirement


manufacturer Transformer bushing

insulators 132 kV 33kV Neutral

7 Length of Insulators (Overall)

mm To be mentioned

To be mentioned

To be mentioned

8 Weight of Insulator Kg To be mentioned

To be mentioned

To be mentioned

9 Electrostatic capacity of complete bushing

pF >200 >90 >90

10 Dry lightning impulse voltage withstand

(1.2/50 wave)

kV 650 170 170

11 50 Hz wet withstand voltage without arcing

horns

kV 275 70 70

12 Creepage distance of outdoor shedding

mm/ KV

(min)

25 25 25

13 Protected creepage distance of sheding

mm To be mentioned

To be mentioned

To be mentioned

C) Current Transformer: Sl. No. Description Unit Technical Data/ BPDB's

Requirement Technical Data to be filled up

by tenderer/ manufacturer 1. Rated primary current A rms 1600-1200-800 2. Rated secondary current A rms 5 3. Rated frequency Hz 50 4. Highest voltage for equipment kV 36

5. Rated insulation level - primary winding kV 70

6. Lightning impulse withstand kV pk 170

7. a) Power frequency

withstand (dry) kV rms 70

b) Power frequency withstand (wet) kV rms 70

8. Insulator creepage (phase to earth)

mm/kV (min)

25

9. Electrical dissipation factor at power frequency test voltage As per IEC 60044-1

10. Rated short term thermal current for 3s KA 25

11. Rated dynamic current kA pk 62.5 12. Insulation class A 13. Secondary Core Details

14.

Number of secondary windings 3

Location of core Top of the Tank Core - 1 Rated Burden VA 30 Secondary Current A 5 Accuracy class 0.2 Core - 2 Rated Burden VA 30 Secondary Current A 5 Accuracy class 5P20 Core - 3

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Rated Burden VA 30 Secondary Current A 5 Accuracy class 5P20

15. Weight (without supporting structure) 110 kgs (Approx.)

16. Overall height (without supporting structure) (1180±50) mm

17. Materials for coil Copper Wire & Insulation Paper

18. Colour of insulator Brown

19. Is earth screen fitted between primary and secondary windings

No

20. Type test certificate ref/date Enclosed 21. Bushing Porcelain outdoor type 22. Standard IEC 60044-1 D) Details Specification of 33KV Vacuum Circuit Breaker: Sl Description Unit Technical data/ BPDB's

Requirement Technical Data to be filled up

by tenderer/ manufacturer

1. Type Vacuum Circuit Breaker

2. Number of Phase 3 (Three)

3. Operation Gang Operated

4. Service Voltage KV 33

5. Maximum Rate Voltage KV 36

6. Frequency Hz 50

7. Normal Rated Current A 1600

8. Symmetrical Breaking Capacity

MVA 1800

9. Asymmetry % 50

10. Short Time Current Duration KA, Sec

31.5 KA, 3 Sec.

11. Making Current (Peak) KA KA 80

12. Opening Time (Maximum) Sec. 0.05

13. Breaking Time Cycle 5

14. Capacity of Vacuum Interrupter at rated short circuit current switching

≥100 nos. of operations

15. Basic Insulation Level (1.2/50 Micro Second Wave)

KV 170

16. Power Frequency Test Voltage (Dry)

KV, Hz, Min

70 KV at 50 Hz, 1 Min.

17. Rated Operating Voltage of Closing / Opening coils

V DC 110

18. Rated Operating Sequence/ Duty Cycle

0-0.3 Sec – CO – 1 min – CO

19. Standard Design, Manufacture, Testing, Installation and Performance shall be in

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accordance with the latest edition of applicable IEC–6056 & IEC-62271-100

20. FEATURES

Circuit Breaker terminal connectors shall be suitable for ACSR Martin, Gross Beak

- Grading terminal connector. - All current carrying parts shall be made of Copper- Aluminum

Alloy - Externally visible circuit breaker position indicator. - Electrically remote controlled operating mechanism. - Shall be capable of the interrupting duties produced by the

switching of transformer magnetizing current and the switching of line charging current. Tests certificate demonstrating this ability of the circuit breakers shall be submitted with the offer.

- Circuit Breaker closing mechanism shall be 230 V AC motor spring-operated type such that the closing speed is independent of the operator.

- Shall be two tripping coils and one closing coil. - Hand closing and tripping shall be done through manual levers. - Trip free mechanism as specified in IEC 60056-1 i.e. tripping is

independent. - Local “Close” and “Trip” controller. - Breaker should be re-strike free. - Breaker should be trip free. - Operation Counter. - Supporting Steel Structure. - Bushing Insulator as Specified in IEC-60137. - Weather proof sheet steel control kiosk, with hinged door on

three sides and necessary multi-core cable glands. Controls from this position will normally are used under maintenance and emergency conditions only. AC 230V lighting system inside the door of control kiosk shall be provided.

- ARC suppression type contacts. - Manually operating devices for slow closing for inspection and

maintenance. It shall not be possible to slow close a breaker when in normal services.

- Earthing pad with provision for earth leads. - Standard sundries like anti-condensation heaters, MCBS wiring

board etc. Facilities to be incorporate for tripping and lockout of the breaker

in the event Vacuum failure falling below stipulated value. - Rating plate and diagram plate shall be made of stainless steel

and have engraved letters filled with black enamel paint. - Evidence of type tests with test certificate from a recognized

institution covering the equipment shall be furnished with the offer. The test duty shall be as per the requirements of IEC–60056.

- Laminated control & protection drawing set shall be fitted/ supplied inside the control box/kiosk.

- Motor-driven, spring charged - Automatically charged after each closing operation - O-C-O operation without recharging - Mechanical / electrical anti-pumping - Provision for manual charging - Manual closing and tripping arrangement - Mechanical ON-OFF, operation counter and spring-charged

indication

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- All necessary positive interlocks installed, as per IEC guidelines - Bidder shall supply manuals (installation & maintenance

guidelines) describing trouble shooting procedure (2 copies). E) Details Specification of Conductor: Sl. No.

Description Unit Technical Data/ BPDB's Requirement

Technical Data to be filled up by tenderer/ manufacturer

1. Name of the Item ACSR MARTIN 2. Name of the Manufacturer,

Country of origin To be mentioned

3. Standard Performance Design and Testing shall be in accordance to the BS, IEC, ASTM, BDS or equivalent International standards.

4. Installation Overhead 5. Type Stranded 6. Material Hard drawn Aluminium Steel

Reinforced

7. Current rating A 1600

8. Overall diameter mm 36.17 9. Nominal cross sectional area of

conductor mm2 772.10

10. Number/diameter of Aluminium Strand

No./mm

54/4.02

11. Nominal Aluminium cross sectional area

mm2 685.40

12. Number/diameter of Steel Strand No./mm

19/2.41

13. Nominal Steel cross sectional area

mm2 86.70

14. Weight of conductor Kg/KM

2590

15. Drum wound length M 500 16. Net weight Kg To be mentioned 17. Gross weight Kg To be mentioned 18. Maximum DC Resistance of

Conductor at 20 °C Ω/KM

0.0425

19. Minimum breaking Load of Conductor

Kg To be mentioned

20. Maximum working tension of conductor

KN To be mentioned

21. Current rating at 35ºC rise over 40ºC ambient temperature (75ºC)

Amps.

538 (min)

22. Practical (final) modulus of elasticity

hbar To be mentioned

23. Co-efficient of linear expansion /ºC To be mentioned 24. Aluminum to Steel Ratio Shall be mentioned 25. Lay length for Outermost Layer

of Aluminium mm Shall be mentioned

26. Lay direction for Outermost Layer of Aluminium

Right hand

27. Lay ratio for Outermost Layer of Aluminium

10-14

28. Treated Wooden Drum Standard AWPA C1 – 82, C2 –83, C16 –82, P5 –83.

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F) Details Specification of PCM (Protecion, Control & Measuring) of 33KV Breaker:

Sl. No.



manufacturer 33KV PCM PANEL

1 Manufacturer’s Name & Country of panel

- To be mentioned

PROTECTION 2 IDMT OVER CURRENT & EARTH FAULT WITH DIRECTIONAL FEATURE

2.1 Manufacture's name & country of relay

- SIEMENS (Germany/Switzerland)/ ABB (Switzerland/Finland/Sweden)/ Schneider (UK/France) NR China/

Alstom UK/France

2.2 Manufacture's model no. - To be mentioned 2.3 Type of relay - Numerical programmable 2.4 Directional Feature can be

activated/de-activated Yes/No Yes

2.5 Range of current setting : a) Phase element b) Each fault element

% of CT

rating %of CT rating

To be mentioned

To be mentioned

2.6 Range of timing settings at 10 time CT rating

Sec To be mentioned

2.7 Burden of relay at 10 time CT rating

VA To be mentioned

2.8 Percentage of current setting at which relay will reset

% To be mentioned

2.9 Reset time after removal of 10 time CT rated current for : a) Phase element (100%) b) E/F element (40%)

Sec Sec

To be mentioned To be mentioned

METERING AND INDICATION 3. KWh Meter 3.1 Manufacture’s Name &

Country - To be mentioned

3.2 Manufacture’s Model no. - To be mentioned 3.3 Type of meter - Numerical programmable

multifunction

3.4 Class of accuracy - 1.0 4. INDICATION VOLT & AMPERE METERS

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Sl. No.



manufacturer 4.1 Manufacturer’s Name and

Country - To be mentioned.

4.2 Manufacture’s Model no. - To be mentioned 4.3 Type of meter - Analogue 4.4 Class of Accuracy - 1.0 5. ANNUNCIATOR 5.1 Manufacturer’s Name and

Country To be mentioned.

5.2 Manufacturer’s Model/type No. To be mentioned. 6. Trip Relays 6.1 Manufacturer’s Name and

Country - To be mentioned.

6.2 Manufacturer’s Model/type No. - To be mentioned. 6.3 Operating Times ms < 10 7. CONTROL SWITCH 7.1 Manufacturer’s Name and

Country To be mentioned.

7.2 Manufacturer’s Model/type No. To be mentioned. N.B. The data provided here must be sealed and signed by both the manufacturer and tenderer as Guaranteed Data.

Seal & Signature of the Manufacturer

Name: [insert full name of signatory] In the capacity of: [insert designation of signatory]

Seal & Signature of the Tenderer

Name: [insert full name of signatory]

In the capacity of: [insert designation of signatory]

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Section 6. Schedule of Requirements

Invitation for Tender No: Date Tender Package No:

A. List of Goods and Delivery Schedule

When completing Form PG4-3A, 3B & 3C the Tenderer shall quote prices and contract delivery dates for each lot separately, as specified in the List of Goods and Delivery Schedule.

Item No.

Description of Item

Manufacturer's Specifications

Unit of Measure

ment

Qty Point of Delivery

[Final (Project Site) Destination as specified

in TDS]

Delivery Date Required (in weeks)

Earliest Delivery Date

Latest Delivery Date

1 Power Transformer

132/33kV, 50/75MVA, 3-Phase Power Transformer

Set 01 Shikalbaha 60MW Power

Station Store

180 Days from the date of

opening of L/C for whole of the

Supply, Design,

Installation, Testing &

Commissioning Works

2 33kV C.T. 800/1200/1600/5 Set (03

Nos)

01

3 33kV VCB 1600A Set 03

4 Gantry Structure

1m:1m:3m (12 Set) & 1m:1m:4m (08 Set)

Lot 01

5 Control Cable 4rm and 2.5rm Lot 01

6 Conductor ACSR Martin Lot (2.5km)

01

7 PCM panel for 33kv Breaker

As per mentioned in Section:7 Technical specification

Set 03

Note: This Section provides the List of Goods and Delivery Schedule and List of Related Services and Completion Schedule and must be carefully prepared by a Purchaser for each object of procurement The Purchaser may include the delivery of a limited supply of fast-moving and/or hard-to-find spare parts in this Schedule of Requirement. This is to ensure the continued use or operation of the equipment.

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B. List of Related Services and Completion Schedule

When completing Form PG4-3D, the Tenderer shall quote prices and Completion date for services for each item against each lot

Item No.

Description of Item Unit of Measuremen

t

Quantity Place where Services shall be performed

Final Completion Date(s) of Services

1 2 3 4 5 6

01 Necessary Civil Works (Modification of Existing Transformer PAD, Bus bar connection and structure for 3 nos 33 kv VCB)

Lot 01 Shikalbaha Power Plant Sub-station

180 Days from the date of opening of

L/C for whole of the Supply, Design,

Installation, Testing & Commissioning

Works 02 Installation, Testing

& Commissioning Lot 01 do do

Lot No 1: [enter description] [add as many rows and details as there are individual items in the Lot]

Lot No 2: [enter description] [add as many rows and details as there are individual items in the Lot]

Notes on Related Services The Purchaser shall clearly specify the related services/Incidental services, other than inland transportation and other services required to convey the Goods to their final destination, in this Schedule of requirement. In particular, these services may refer to any of the following but not limited to:

(a) performance or supervision of on-site assembly and/or start-up of the supplied Goods;

(b) performance or supervision or maintenance and/or repair of the supplied Goods, for a period of time as specified, provided that this service shall not relieve the Supplier of any warranty obligations under this Contract; and

(c) training of the Purchaser’s personnel, at the Supplier’s plant and/or on-site, in assembly, start-up, operation, maintenance, and/or repair of the supplied Goods

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Section 7. Technical Specifications

7.1 Plant History Shikalbaha Power Station is located at Shikalbaha, in the district of Chittagong. There are two units in Shikalbaha Power Station. One is 150MW Gas turbine Unit and another is 60MW Steam Turbine Unit. Both the unit is running on Gas. 7.2 Project Manager & Engineers shall have the following qualifications and experience:

• Qualification: B.Sc Engineering (Electrical) • Experience: 10 years experience in related field. • Foreman, Semi skilled & unskilled technicians as required

7.3 System Particulars:

SL. NO. SYSTEM CHARACTERISTICS VOLTAGE LEVEL

1. Normal System Voltage, kV (Voltage Class) 230 132 33 11 3. Maximum System Voltage, kV 245 145 36 12 4. System Frequency, Hz 50 50 50 50 5. Phase Rotation (Anti-Clock wise) RST RST RST RST 6. Type of System Grounding Solid Solid Solid Solid 7. Rated Fault Level (3-Phase Symmetrical), MVA 3

sec. 16000 6000 1800 500

8. Basic Insulation Level , kV 750 650 170 75

7.4 Standards:

The equipment specified in this Section of the contract shall conform to the latest edition of the appropriate IEC specifications and other recognized international standard. In particular:

IEC 60076-1 Power transformers (General). IEC 60076-2 Power transformers (Temperature Rise). IEC 60076-3 Power transformers (Insulation Levels, Dielectric Tests and External

Clearance in air). IEC 60076-5 Power transformers (Ability to Withstand short circuit) IEC 60137 Bushings for alternating voltages above 1 kV. IEC 60156 Method of determination of electrical strength of insulating oils. IEC 60296 Specification for unused mineral insulating oils for transformers and

switchgear. IEC 60551 Measurement of transformer and reactor sound levels. IEC 60616 Terminal and tapping markings for power transformers. IEC 722 Guide to lightning and switching impulse testing of power transformers. IEC 5493 Protective coating of iron and steel structures against corrosion. IEC 551 Noise and Vibration of power transformer

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7.5 Scope of work:

The scope of works of Design, Supply, Installation, Testing & Commissioning of 132/33kV, 50/75MVA Transformer, 33kV Vacuum Circuit Breaker & Related Accessories for Shikalbaha 60 MW Peaking Power Plant, BPDB, Chittagong, Bangladesh have been furnished below but not limited to the followings: 1. Removal of damage transformer and placed it into the Shikalbaha Power Station Store. 2. Installation, Testing Commissioning of Power Transformer with all necessary fittings. 3. Necessary Civil Works (Modification of existing transformer pad, Bus bar connection and structure

for 3 nos 33 kv VCB. etc.) 4. Necessary Gantry Repairing Works. 5. Necessary CT Replacement Work. 6. Necessary Inter connection works. 7. Necessary Protection Testing and matching with existing protection system works. 8. Commissioning of the Power Transformer.

7.6 Scope of Supply: Sl Description of Material Quantity 1. 132/33 KV, 50/75 MVA, 3-Phase Power Transformer 1 set 2. Current Transformer (1600-1200-800/5 A, 33kV) 1 set (3 nos) 3. VCB (33kV, 1600A) 3 set 4. Gantry Structure 1m:1m:3m (12 Set) & 1m:1m:4m (08 Set) 1 lot 5. Control Cable (4rm & 2.5rm) 1 lot 6. Conductor (ACSR Martin) 1 lot (2.5km) 7. PCM panel for 33kv Breaker 03 set 7.7 Details Specification requirement of the 3-Phase Power Transformer: Sl. No. Description Unit Technical Data

1.1 Continuous Rating - ONAN 50 MVA 1.2 ONAF 75 MVA 1.3 Overall Dimension (LxWxH) To be mentioned 2 Voltage ratio at No-Load HV/LV kV 132/33 3 Tap Changer

3.1 HV Tap Changer (On Load Type) Tapping Range +10% to -10%

3.2 Size of tapping step 1.25% 3.3 No. of Steps +/-8 4 Type of System Earthing Effectively Earthed 5 Bushing Material Porcelain

6 Type of Base On wheels with adequate size and

approx.10m lengths of rails and fixing arrangement.

7 Direction of Normal Power Flow HT-LT 8 Vector Group Dyn1 9 On-Load Votlage Control Equipment:

9.1 Type On load auto regulation and remote & manual control

9.2 Manufacturer MR, Germany/ ABB, Sweden/ HM, China 9.3 Range % +/-10% 9.4 Size of Steps % 1.25

9.5

Power frequency withstand test voltage (BS.4571) between: first and last contacts of the selector switch between any two adjacent contacts of the selector between

kV rms 275

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Sl. No. Description Unit Technical Data open diverter switch contacts

9.6 Type test certificate reference To be submitted 10 Type of cooling ONAN/ONAF

11 Winding temperature rise at CMR under service conditions stated in Schedule of Technical Requirement

0C To be mentioned

12 Top oil temperature under service conditions stated in Schedule of Technical Requirement

12.1 CMR 0C To be mentioned 12.2 ONAN Rating 0C To be mentioned 13 Maximum hot spot temperature in core at

rated power 0C ~114

14 Maximum hot spot temperature in winding at rated power

0C ~115

15 Temperature gradient at rating specified 0C 20 approx. 16 Core Manufacturer’s Name & Address To be mentioned 17 Material of core & grading To be mentioned

18 Core Loss/ Kg, supported by Characteristic Curve (to be submitted )

To be mentioned

19 Thickness of core, mm To be mentioned 20 Core Dia, mm To be mentioned 21 Total weight of core, Kg To be mentioned

22 Flux density in iron at normal voltage and frequency and at normal ration (No load)

22.1 Cores Tesla < 1.7 22.2 Yokes Tesla < 1.7 22.3 Volts/Turn V ~120

23 Magnetising Current (Approx.) at nominal ratio and

23.1 at 0.9 x nominal voltage % ~0.1 23.2 at 1.0 x nominal voltage % ~0.2 23.3 at 1.1 x nominal voltage % ~0.4 23.4 at 1.2 x nominal voltage % ~0.5

24 Harmonic component of magnetising current at rated voltage as percentage of fundamental

24.1 Fifth harmonic % To be mentioned 24.2 Seven harmonic % To be mentioned

25 No-Load Loss at rated voltage, ratio and frequency kW 26~32

26 Load Loss (excluding cooling fan losses) at 750C and at rated voltage, ratio (nominal tap), frequency, 75 MVA & at ONAN

kW To be mentioned

27 Load Loss (excluding cooling fan losses) at 750C and at rated voltage, ratio (nominal tap), frequency, 75 MVA & at ONAF

kW 225~275

28 Auxiliary loss (Cooling fan losses) at 75 MVA (Total power input to fans for operation of total installed cooling capacity)

kW To be mentioned

29 Total loss at 750C and normal ratio and 75 MVA (Sl.No. 21+23+24) kW To be mentioned

30 Regulation at 750C and normal ratio - 30.1 At unit power factor % % ~1.05 30.2 At 0.8 lagging power factor % ~7.91

31 Impedance voltage at 750C and CMR between HV & LV windings

31.1 at extreme minus tap % To be mentioned

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Sl. No. Description Unit Technical Data 31.1.1 at normal tap % ~12 31.1.2 at extreme plus tap % To be mentioned 31.2 Maximum Impedance over tapping range To be mentioned

31.2.1 corresponding tap To be mentioned 31.3 Minimum Impedance over tapping range % To be mentioned

31.3.1 Corresponding tap To be mentioned

32 Equivalent circuit zero sequence impedance:

32.1 HV - LV ~10.2

33 Maximum current density in windings at C.M.R.

33.1 HV Winding A/mm2 To be mentioned 33.2 LV Winding A/mm2 To be mentioned 34 Noise Level dB As per IEC 60551 35 Types of Transformers (Shell or core) Core 36 Core steel

36.1 Type CRGO(Cold Rolled Grain Oriented Silicon Steel)

36.2 Grade M4 or Superior grade 37 Types of winding

37.1 HV To be mentioned 37.2 LV To be mentioned

38 Copper Conductor's Manufacturer Name & Address

To be mentioned

39 Material of windings - copper 40 Winding resistance of :

40.1 H.T. winding, Ohm. To be mentioned 40.2 L.T. winding, Ohm. To be mentioned 41 Current density of :

41.1 H.T. winding, Amps/sq. mm A/mm2 To be mentioned 41.2 L.T. winding, Amps/sq. mm A/mm2 To be mentioned 42 Outer, Inner & Mean dia of copper winding:

42.1 H.T. winding, mm To be mentioned 42.2 L.T. winding, mm To be mentioned 43 Size of Copper conductor/bar :

43.1 H.T. winding SWG, dia. in mm / area in mm2

To be mentioned

43.2 L.T. winding SWG, area in mm2 To be mentioned 44 Number of Turns :

44.1 HT winding. nos. To be mentioned 44.2 LT winding nos. To be mentioned 45 Copper weight of windings :

45.1 HT winding Kg To be mentioned 45.2 LT winding Kg To be mentioned 46 Insulation of

46.1 HV Winding To be mentioned 46.2 LV Windings To be mentioned 47 Insulation of

47.1 Yoke bolts To be mentioned 47.2 Side plates To be mentioned 48 Safe working temperature of core plate

insulation 0C 125

49 Winding connections brazed or cripmed To be mentioned 50 For fault with zero impedance external to

the transformer and infinite system

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Sl. No. Description Unit Technical Data 50.1 Maximum axial force kN To be mentioned 50.2 Maxijum tensile stress in winding N/m2 To be mentioned 51 Is facility provided for adjustment of axial

pressure on windings Yes/No To be mentioned

52 Thickness of transformer tank 52.1 Sides mm To be mentioned 52.2 Top Plate mm To be mentioned 52.3 Bottom Plate mm To be mentioned 52.4 Vacuum withstand capability of the tank

52.4.1 Main tank Kpa To be mentioned 52.4.2 Conservator Kpa To be mentioned 52.4.3 Radiators Kpa To be mentioned 52.5 Provision of tank earthing Nos 53 Material used for gaskets for oil tight joints To be mentioned

Radiators, Valves, Fans 54 Thickness of radiator plates mm To be mentioned 55 Valve type/material: 55.1 100mm and below To be mentioned

55.2 Above 100mm To be mentioned 56 Equipment for ONAF + Cooling state (A)

56.1 Radiators on main tank Yes

57 Number of coolers/radiators or cooler banks per transformer To be mentioned

58 Number of air blowers per transformer To be mentioned 59 Speed of air blowers rpm To be mentioned 60 Rating of each air blower motor To be mentioned 61 Starting current of each air blower motor A To be mentioned

Oil Volumes and Weights 62 Total oil required including cooler system Litres To be mentioned

63 Volume of oil to fill transformer to above the top yoke Litres To be mentioned

64 Total volume of conservator Litres To be mentioned 65 Weight of active copper Tonnes To be mentioned 66 Weight of active iron in core Tonnes To be mentioned 67 Weight of core and winding assembly Tonnes To be mentioned

68 Weight of each cooler bank complete with oil if mounted separately from transformer Tonnes To be mentioned

69 Total weights of complete transformers, including attached coolers, voltage regulating equipment, all fittings and oil

Tonnes To be mentioned

70 Weight of transformer arranged for transport Tonnes To be mentioned

71 Manufacturer, type and class of oil to IEC 296 Class-1 grade, insulating mineral oil, free

from PCB (polychlorinated biphenyl) 72 Drawing and manuals 2 copies To be submitted with Transformer

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7.8 Details Specification of Bushing Current Transformer: Sl. No. Description Unit Technical Data

Transformer bushing insulators

132 kV 33kV Neutral

1 Maker To be mentioned To be mentioned To be mentioned 2 Insulator materials (Solid, oil

papner etc) Oil paper Solid Solid

3 Maker's type reference and rated voltage

To be mentioned To be mentioned To be mentioned

4 Rated current 800 2000 2000 5 BCT particulars

5.1 HV Side Core 1.2 & Core 3 Core 1 & 2:

600-400/5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter

5.2 LV Side Core 1.2 3 & Core 4 Core 1 & 2:

2400-1600/5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter Core 4: Ratio, burden & accuracy class to be matched with LDC meter

5.3 Neutral Core 1 & 2 Core 1 :

2400-1600/5A CL: 5P20 30 VA Core 2 : 2400-1600/5A CL: 5P20 30 VA

6 Manufacturer of Porcelain To be mentioned To be mentioned To be mentioned 7 Length of Insulators (Overall) mm To be mentioned To be mentioned To be mentioned 8 Weight of Insulator Kg To be mentioned To be mentioned To be mentioned 9 Electrostatic capacity of

complete bushing pF >200 >90 >90

10 Dry lightning impulse voltage withstand (1.2/50 wave)

kV 650 170 170

11 50 Hz wet withstand voltage without arcing horns

kV 275 70 70

12 Creepage distance of outdoor shedding

mm/ KV

(min)

25 25 25

13 Protected creepage distance of sheding

mm To be mentioned To be mentioned To be mentioned

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7.9 Details Specification of Current Transformer: Sl. No. Description Unit Technical Data

1. Rated primary current A rms 1600-1200-800 2. Rated secondary current A rms 5 3. Rated frequency Hz 50 4. Highest voltage for equipment kV 36

5. Rated insulation level - primary winding kV 70

6. Lightning impulse withstand kV pk 170

7. a) Power frequency withstand

(dry) kV rms 70

b) Power frequency withstand (wet) kV rms 70

8. Insulator creepage (phase to earth) mm/kV (min) 25

9. Electrical dissipation factor at power frequency test voltage As per IEC 60044-1

10. Rated short term thermal current for 3s KA 25

11. Rated dynamic current kA pk 62.5 12. Insulation class A 13. Secondary Core Details

14.

Number of secondary windings 3 Location of core Top of the Tank Core - 1 Rated Burden VA 30 Secondary Current A 5 Accuracy class 0.2 Core - 2 Rated Burden VA 30 Secondary Current A 5 Accuracy class 5P20 Core - 3 Rated Burden VA 30 Secondary Current A 5 Accuracy class 5P20

15. Weight (without supporting structure) 110 kgs (Approx.)

16. Overall height (without supporting structure) (1180±50) mm

17. Materials for coil Copper Wire & Insulation Paper 18. Colour of insulator Brown

19. Is earth screen fitted between primary and secondary windings No

20. Type test certificate ref/date Enclosed 21. Bushing Porcelain outdoor type 22. Standard IEC 60044-1 7.10 Details Specification of 33KV Vacuum Circuit Breaker:

Sl Description Unit Technical data

1. Type Vacuum Circuit Breaker

2. Number of Phase 3 (Three)

3. Operation Gang Operated

4. Service Voltage KV 33

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5. Maximum Rate Voltage KV 36

6. Frequency Hz 50

7. Normal Rated Current A 1600

8. Symmetrical Breaking Capacity MVA 1800

9. Asymmetry % 50

10. Short Time Current Duration KA, Sec 31.5 KA, 3 Sec.

11. Making Current (Peak) KA KA 80

12. Opening Time (Maximum) Sec. 0.05

13. Breaking Time Cycle 5

14. Capacity of Vacuum Interrupter at rated short circuit current switching

≥100 nos. of operations

15. Basic Insulation Level (1.2/50 Micro Second Wave)

KV 170

16. Power Frequency Test Voltage (Dry) KV, Hz, Min

70 KV at 50 Hz, 1 Min.

17. Rated Operating Voltage of Closing / Opening coils

V DC 110

18. Rated Operating Sequence/ Duty Cycle 0-0.3 Sec – CO – 1 min – CO

19. Standard Design, Manufacture, Testing, Installation and Performance shall be in accordance with the latest edition of applicable IEC–6056 & IEC-62271-100

20. FEATURES

Circuit Breaker terminal connectors shall be suitable for ACSR Martin, Gross Beak - Grading terminal connector. - All current carrying parts shall be made of Copper- Aluminum Alloy - Externally visible circuit breaker position indicator. - Electrically remote controlled operating mechanism. - Shall be capable of the interrupting duties produced by the switching of transformer

magnetizing current and the switching of line charging current. Tests certificate demonstrating this ability of the circuit breakers shall be submitted with the offer.

- Circuit Breaker closing mechanism shall be 230 V AC motor spring-operated type such that the closing speed is independent of the operator.

- Shall be two tripping coils and one closing coil. - Hand closing and tripping shall be done through manual levers. - Trip free mechanism as specified in IEC 60056-1 i.e. tripping is independent. - Local “Close” and “Trip” controller. - Breaker should be re-strike free. - Breaker should be trip free. - Operation Counter. - Supporting Steel Structure. - Bushing Insulator as Specified in IEC-60137. - Weather proof sheet steel control kiosk, with hinged door on three sides and

necessary multi-core cable glands. Controls from this position will normally are used under maintenance and emergency conditions only. AC 230V lighting system inside the door of control kiosk shall be provided.

- ARC suppression type contacts. - Manually operating devices for slow closing for inspection and maintenance. It shall

not be possible to slow close a breaker when in normal services. - Earthing pad with provision for earth leads. - Standard sundries like anti-condensation heaters, MCBS wiring board etc. Facilities to be incorporate for tripping and lockout of the breaker in the event Vacuum

failure falling below stipulated value. - Rating plate and diagram plate shall be made of stainless steel and have engraved

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letters filled with black enamel paint. - Evidence of type tests with test certificate from a recognized institution covering the

equipment shall be furnished with the offer. The test duty shall be as per the requirements of IEC–60056.

- Laminated control & protection drawing set shall be fitted/ supplied inside the control box/kiosk.

- Motor-driven, spring charged - Automatically charged after each closing operation - O-C-O operation without recharging - Mechanical / electrical anti-pumping - Provision for manual charging - Manual closing and tripping arrangement - Mechanical ON-OFF, operation counter and spring-charged indication - All necessary positive interlocks installed, as per IEC guidelines - Bidder shall supply manuals (installation & maintenance guidelines) describing trouble

shooting procedure (2 copies). 7.11 Details Specification of Conductor:

Sl. No.

Description Unit Purchaser’s Requirement

1. Name of the Item ACSR MARTIN 2. Name of the Manufacturer,

Country of origin To be mentioned

3. Standard Performance Design and Testing shall be in accordance to the BS, IEC, ASTM, BDS or equivalent International standards.

4. Installation Overhead 5. Type Stranded 6. Material Hard drawn Aluminium Steel

Reinforced 7. Current rating A 1600

8. Overall diameter mm 36.17 9. Nominal cross sectional area of conductor mm2 772.10

10. Number/diameter of Aluminium Strand No./mm 54/4.02

11. Nominal Aluminium cross sectional area mm2 685.40

12. Number/diameter of Steel Strand No./mm 19/2.41

13. Nominal Steel cross sectional area mm2 86.70

14. Weight of conductor Kg/KM 2590 15. Drum wound length M 500 16. Net weight Kg To be mentioned 17. Gross weight Kg To be mentioned 18. Maximum DC Resistance of Conductor at

20 °C Ω/KM 0.0425

19. Minimum breaking Load of Conductor Kg To be mentioned

20. Maximum working tension of conductor KN To be mentioned

21. Current rating at 35ºC rise over 40ºC ambient temperature (75ºC)

Amps. 538 (min)

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22. Practical (final) modulus of elasticity hbar To be mentioned

23. Co-efficient of linear expansion /ºC To be mentioned 24. Aluminum to Steel Ratio Shall be mentioned 25. Lay length for Outermost Layer of

Aluminium mm Shall be mentioned

26. Lay direction for Outermost Layer of Aluminium

Right hand

27. Lay ratio for Outermost Layer of Aluminium

10-14

28. Treated Wooden Drum Standard AWPA C1 – 82, C2 –83, C16 –82, P5 –83.

7.12 Details Specification of PCM (Protection, Control & Measuring) of 33KV Breaker:

Sl. No.


33KV PCM PANEL

1 Manufacturer’s Name & Country of panel - To be mentioned PROTECTION 2 IDMT OVER CURRENT & EARTH FAULT WITH DIRECTIONAL FEATURE

2.1 Manufacture's name & country of relay - SIEMENS (Germany/Switzerland)/ ABB

(Switzerland/Finland/Sweden)/ Schneider (UK/France)/ NR China/ Alstom UK/France

2.2 Manufacture's model no. - To be mentioned 2.3 Type of relay - Numerical programmable 2.4 Directional Feature can be activated/de-

activated Yes/No Yes

2.5 Range of current setting : a) Phase element b) Each fault element

% of CT

rating %of CT rating

To be mentioned

To be mentioned

2.6 Range of timing settings at 10 time CT rating

Sec To be mentioned

2.7 Burden of relay at 10 time CT rating VA To be mentioned 2.8 Percentage of current setting at which

relay will reset % To be mentioned

2.9 Reset time after removal of 10 time CT rated current for : a) Phase element (100%) b) E/F element (40%)

Sec Sec

To be mentioned To be mentioned

METERING AND INDICATION 3. KWh Meter 3.1 Manufacture’s Name & Country - To be mentioned 3.2 Manufacture’s Model no. - To be mentioned 3.3 Type of meter - Numerical programmable

multifunction 3.4 Class of accuracy - 1.0 4. INDICATION VOLT & AMPERE METERS

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Sl. No.


4.1 Manufacturer’s Name and Country - To be mentioned.

4.2 Manufacture’s Model no. - To be mentioned 4.3 Type of meter - Analogue 4.4 Class of Accuracy - 1.0 5. ANNUNCIATOR 5.1 Manufacturer’s Name and Country To be mentioned. 5.2 Manufacturer’s Model/type No. To be mentioned. 6. Trip Relays 6.1 Manufacturer’s Name and Country - To be mentioned. 6.2 Manufacturer’s Model/type No. - To be mentioned. 6.3 Operating Times ms < 10 7. CONTROL SWITCH 7.1 Manufacturer’s Name and Country To be mentioned. 7.2 Manufacturer’s Model/type No. To be mentioned.

Note: -During execution of work, if any other work is required to be done and/or additional spares / materials/hardware/consumables are required for successful completion of Design, Supply, Installation, Testing & Commissioning of 132/33kV, 50/75MVA Transformer, 33kV Breaker & Related Accessories for Shikalbaha 60 MW Peaking Power Plant, BPDB, Chittagong, the contractor has to perform the supply of the materials/ items/ spares/consumables (if required) and execute the work, in all respect within the quoted price. - Details Drawings and manuals have to be submitted along with the transformer delivery.

- The Intended Completion Date for the whole of the Supply, Design, Installation, Testing & Commissioning Works shall be: 180 Days from the date of opening of L/C.

- After Completion of complete commissioning works, Contractor has to submit different type of required test Report of the transformer to the Consignee.

7.12 Documentation: The Tenderer/ Manufacturer shall provide all Drawings, Technical Documents along with offer for the offered type of 50/75 MVA, 132/33 kV Transformer with related accessories, 33kV Vacuum Circuit Breaker as per tender requirements.

7.13 Test Reports: The following test reports and test certificates including their test results for the routine tests, type tests and special test prescribed in "relevant IEC Standard" for the offered 50/75 MVA, 132/33kV or higher rating transformer, 33kV Current Transformer, 33kV Vacuum Circuit Breaker are to be furnished with the Bid, otherwise the bid will be treated as non-responsive and will not be considered for further evaluation.

7.13.1 Routine Tests: a) Measurement of insulation resistance. b) Measurement of Voltage ratio test. c) Measurement of winding resistance at Each Tap position. d) Vector group test. e) Measurement of no-load loss & current. f) Measurement of short circuit impedance and load loss. g) Power frequency (Separate source voltage) withstands test. h) Transformer oil test.

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7.13.2 Type Tests:

a) Temperature Rise Test b) Lightning Impulse Test

7.13.3 Special Tests: a) Short circuit withstands test report of HV-LV.

Note:

Tests Reports as per relevant IEC shall be submitted from KEMA, Netherlands; CESI, Italy; CPRI, India; Intertek (ASTA), UK; ESEF ASEFA, France; JSTC, Japan; KERI, South Korea; PEHLA, Germany; SATS, Norway; STLNA, USA; VEIKI, Hungary; ZKU, Czech Republic; China National Transformer Quality Supervision Testing Center (CTQC), China; China Electric Power Research Institute (CEPRI), China.

7.14 Capitalized Cost: Bidder shall declare guaranteed No Load Loss and Full Load Loss value in Specifications Submission and Compliance sheet (PG4-4). Any Tenderer quoted the No Load Loss & Full Load Loss above the upper limit of the loss as mentioned in form PG4-4 (Sl No.21 & 23) in Tender Document will not be considered for further evaluation & treated as non- responsive. The Tenderer who will quote the No Load Loss & Full Load Loss below the lower limit of No Load Loss & Full Load Losses mentioned in form PG4-4 (Sl No.21 & 23), In that case during evaluation Capitalization cost will be calculated only on the basis of the lower limit of No Load Loss & Full Load Loss. Their quoted loss will not be considered for evaluation of capitalization cost. Tenderer's quoted No Load Loss & Full Load Loss must be supported with loss calculation otherwise will be treated as non- responsive. Note 1: Formula for capitalization cost is mentioned below: CT = Capitalised cost of transformer loss =

7.15 Shipping:

[(1+r)n –1] × t × e (P0 +0.44 PFL) r (1+r)n

where, CT = Capitalised cost of transformer loss in Bangladesh Taka r = Discount rate, 15% n = Years of service life, 20 years t = Operating hours in a year, 8760 hours e = Cost of energy, Taka 6.00 per Kwh P0 = No load loss in KW PFL = Full load loss at ONAF condition in KW + Auxiliary Loss in KW L.F. (Load Factor) = 0.44

The fixed and running losses are to be low as consistent with reliable and economical use of materials. The cost of losses is to be minimized and after derivation of above formula the following capitalized parameters will be used in the evaluation of the transformer: CT= 328,990 x P0 + 144,755 x PFL The capitalization cost of energy (CT) will be added to the Quoted Evaluated Prices to arrive at the final evaluated cost of the transformer. The contract will be cancelled if losses exceed the guaranteed value by an amount in excess of followings: Total losses : 10%

Component : 15% of each component loss (Unless the total losses exceeds 10%).

All the delicate components shall be dismantled and packed in strong wooden boxes having inside lined with metallic sheets with proper sealing to protect the content from accidental direct exposure

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to weather during storage. The holes of the transformer tank shall be sealed with proper metal plate and gaskets to prevent leakage of oil and its contamination with atmospheric moisture. The transformer shall be shipped with radiators, busing conservator etc. dismantled but the tank filled with oil. The transformer oil from radiators and conservator shall be shipped in non-returnable drums. The bushing shall be shipped in oil sealed containers to avoid moisture absorption during shipment and storage. Oil shall be complying with IEC-296.

7.16 Bushing: The bushings shall have high factor of safety against leakage to ground and shall be so located as to provide adequate electrical clearances between bushings and grounded parts. Bushings of identical voltage rating shall be interchangeable. All bushings shall be equipped with suitable terminals of approved type and size & shall be suitable for bimetallic connection. The insulation class of the high voltage neutral bushing shall be properly coordinated with the insulation class, of the high voltage winding. Each bushing shall be so coordinated with the transformer insulation so that all flash over will occur outside the tank. All main winding and neutral leads shall be brought out through “out door” type bushings which shall be so located that the full flashover strength will be utilized and the adequate phase clearance shall realised. All porcelain used in bushings shall be of the wet process, homogeneous and free from cavities or other flaws. The glazing shall be uniform in colour and free from blisters, burrs and other defects.

7.16.1 HT Bushing: Provide 3 porcelain outdoor type, oil filled, impulse tested bushing with arcing horns of standard gap and bolted type terminal connectors, with head shrink rubber insulated cap suitable for connection to the incomes leads of ACSR Martin/Grossbeak conductor.

7.16.2 LT Bushing: Provide 4 porcelain outdoor type bushing with bolted type connectors, suitable for connection to outgoing leads of ACSR Martin conductors per phase and suitable for head shrink termination.

7.17 Fault Conditions: The transformer shall be capable of withstanding, on any tapping, for three seconds without damage an external short circuit between phases. The transformer winding shall be capable of withstanding for three seconds without damage a short circuit between one phase and earth with the neutral of the transformer directly earthed. For the purposes of this clause a fault level of 6000MVA at 132kV and 1500 MVA at 33KV terminals shall be assumed. Evidence shall be submitted with the Tender as to the extent to which the manufacturer has provided or is able to prove either by calculation or test the ability of the specified transformers to withstand on any tapping, without damage under service conditions, the terminal and dynamic effects of external short circuit. The Tender shall state the Technical Schedule a brief description of those transformers or parts thereof, which have been subjected to short circuit tests or for which short circuit calculations are available. It is preferred that this information relates to designs comparable with the transformers tenderer but in the event this is not so the Engineer reserves the right to require calculating to prove that the design of transformers tendered will satisfactorily comply with this clause : such calculations being in accordance with the latest revision of IEC/ BS standard.

7.18 Noise: Vibration and noise levels of all transformers and auxiliary plant shall be in accordance with the IEC-551 and its latest version. The contract price shall include noise level tests to be carried out on one transformer.

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7.19 Harmonic Suppression: Transformer shall be designed with particular attention to the suppression of harmonic voltages especially the third and fifth harmonics and to minimize the detrimental effects resulting there from.

7.20 Impedance and Regulation: The Bidder shall be state in the Technical Schedules guaranteed values of impedance measured on normal and extreme tapping and the voltage regulation from no load to CMR at unity power factor and at 0.9 lagging power factor with constant voltage across the higher voltage windings.

7.21 Magnetic Circuit:

The design of the magnetic circuit shall be such as to avoid static discharge development of short circuit paths internally or to the earthed clamping structure and the production of flux components normal to the plane of the laminations. Each lamination shall be insulated with a material stable under the action of pressure and hot oil.

The winding structure and major insulation shall be designed to permit an unobstructed flow of cooling oil through core cooling oil ducts to ensure efficient core cooling.

The magnetic circuit shall be insulated from all structural parts

7.22 Flux Density:

Cores shall be constructed from cold rolled grain oriented steel sheets. Provided the Supplier can provide adequate evidence that there will be no adverse effects due to stray flux heating of core with the quality of steel employed, designs may be offered such that when operating under the most onerous conditions, flux density in any part of the magnetic circuit does not exceed 1.7 Tesla. The Supplier shall determine the operating conditions under which the maximum flux density will be attained within the following simultaneously applied limits. - Frequency : 50 Hz - LV and HV Voltage

: Up to but not exceeding the specified maximum System voltage.

- Load : The transformer may be subjected to intermittent overloading of 150% rated MVA at 0.8 power factor lagging in accordance with IEC-60035.

The maximum flux densities anticipated under these conditions are to be stated in Technical Schedules (GTP).The transformer shall withstand 140 % over fluxing for 5 seconds as per IEC.

7.23 Windings:

a) The windings shall be of high-conductivity electrolytic copper. b) The transformer windings shall have uniform insulation as defined in the latest revision of IEC

standard. The insulation of the coils shall be such as to develop the full electrical strength of the windings. All materials used in the insulation and assembly of the windings shall be insoluble, non-catalytic and chemically inactive in the hot transformer oil, and shall not soften or otherwise be adversely affected under the operating conditions.

c) The transformers shall be designed to withstand the impulse voltage levels and the power frequency voltage tests specified in the Technical Schedules.

d) The winding shall be located in a manner which will ensure and that they remain Electro-statically balanced and that their magnetic centers remain coincident under all conditions of operation.

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e) The winding shall also be thoroughly seasoned during manufacture by the application of axial pressure at a high temperature for such length of time as will ensure that further shrinkage is unlikely to occur in service.

f) All electrical connections within windings shall be brazed to withstand the shocks, which may occur through rough handling and vibration during transport switching and other transient service conditions.

g) Coil clamping rings shall be of the on on-magnetic steel or insulating materials built up from flat laminations. Auxiliary laminated material other then Bakelite paper is not to be used.Where Bakelite paper rings are used with the layers of paper lying in the axial direction, the rings may be relied upon to provide the major insulation between the windings and frame subject to there being adequate creepage distance.Any metal pieces in contact with laminated rings shall be designed and secured so that they do not weaken the electrical or the mechanical properties of the rings.If the winding is built up of section or of disc-coils separated by spacers, the clamping arrangement shall be ensure that equal pressure are applied to all columns of spacers

h) The winding shall be so designed that all coil assemblies of identical voltage ratings shall be interchangeable and field repairs can be readily done, without special equipment. The coils shall be supported between adjacent sections by insulating spacers and the barriers, bracings and other insulation used in the assembly of the windings shall be arranged to ensure a free circulation of the oil and to reduce hot sports in the windings. The insulation paper shall be of high quality and the value of degree of polymerization shall not be less than 1200 dp and the necessary test certificate shall be submitted along with the Pre –delivery inspection report. Provision shall be made in the tank, for taking sample, in future, of paper for testing purpose and location shall be easily accessible and indicated on the transformer tank by affixing special caution plate

7.24 Internal Earthing Arrangement:

All metal parts of the transformer with the exception of the individual core lamination, core bolts and associated individual clamping plates, shall be maintained at some fixed potential. The top main core clamping structure shall be connected to the tank body by a copper strap and the bottom main core clamping structure shall be earthen by one or more of the following methods: - by connection through vertical tie rods to the top structure. - by direct metal-to-metal contact with the tank base maintained by the weight of the core and windings. - by connection to the top structure on the same side of the core as the main earth connection to the tank. The magnetic circuit shall be earthed to the clamping structure at one point through a removable link placed in an accessible position just beneath an inspection opening in the tank cover and which, by disconnection, will enable the insulation between the core and clamping plates, etc. to be tested at voltages up to 2 KV for the purpose of checking deterioration during service. The connection to the link shall be on the same side of the core as the main earth connection. These requirements are mandatory.

Magnetic circuits having an insulated sectional construction shall be provided with a separate link for each individual section and the arrangement of the connections shall be subject to the approval of the Engineer.

Where oil ducts or insulated barriers parallel to the plane the laminations divide the magnetic circuits into two or more electrically separates parts, the ducts and insolating barriers which have the thickness greater than 0.25, mm are to be bridged with tinned copper strips so inserted as to maintain electrical continuity.

Where coil-clamping rings are of metal at each potential, each rings shall be connected to the adjacent core clamping structure on the same side of the transformer as the main earthing connection.

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Main earthing connections shall be a cross-sectional area of not less than 100mm2 but connections inserted between laminations may have cross sectional areas reduced 20mm2 when in close thermal contact with the core.

7.25 Transformer Tank:

The Transformer Tank shall be welded construction fabricated from high tensile steel plate and shall be designed to withstand full vacuum. The transformer shall have air seal type oil conservator tank at the top.

7.26 Oil:

All transformers shall be filled to the required level with new, unused, clean, standard mineral oil after treatment in compliance with IEC 60296 & BS 148.

7.27 Gaskets Any gaskets provided with the transformers shall be suitable for making oil tight joints, and there shall be no deleterious effects of either gaskets or oil when the gaskets are continuously in contact with hot oil. No gaskets shall be used in which the material of the material of the gasket is mounted on a textile backing. Exterior gaskets shall be weatherproof and shall not be affected by strong sunlight.

7.28 Evaluation Criteria (As per Above Mentioned Clause 7.8)

a) The Tenders will be evaluated on the basis of the capitalized cost of the Transformer losses.

b) Bidder will declare/ guarantee of No-Load loss and Full load loss value, otherwise the bid will be

rejected.

c) Bidders declared/ guaranteed percentage impedance value shall be within the specified value,

otherwise the bid will be rejected.

7.29 Acceptance Criteria of Transformer Loss and Percentage Impedance During Factory Test Transformer will be tested during orientation, training & acceptance and will be accepted if the measured transformer losses are within the offered value or within the following tolerance with deduction of money from the quoted/ contract priced as below:

i) Any component loss (No load loss or Full load loss) may exceed up to 15% of the offered component loss, provided that the total loss ((No load loss + Full load loss) does not exceed 10% of the offered total loss. If any component loss exceeds 15% of the offered component loss, the full consignment will be rejected.

ii) Total loss (No load loss + Full load loss) may exceed up to 10% of the offered total loss. If it exceeds 10%, the full consignment will be rejected.

iii) Percentage Impedance may vary up to ±10% of the specified value. If the value exceeds the tolerance (±10%), the full consignment will be rejected.

Transformer will be tested during factory test witness and will be accepted if the measured transformer losses are within the offered value or within the acceptable limit as specified in (i),(ii) & (iii) and provided an amount will be deducted from the Contract Price for the Loss exceeding the specified loss(s) according to the formula:- Amount to be deducted from the Contract Price = Contract Price X

7.30 Recommended Spare Parts:

With the tender the manufacturers shall supply list of recommended spare parts for 3 years operation and maintenance with unit price quoted for each item, which shall be valid for a period of 2 years from the date of signing Contract.

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7.31 Approval of Drawings (If Required):

Calculation for the Max. Temp. Rise of Winding & Oil over 400C ambient supported by Load Losses and Heat Dissipation by Radiator and also Short Circuit Calculation along with thermal & mechanical calculations on the basis of proposed Design Data.

7.32 Tests at Manufacturers Works:

7.32.1 General

Functional electrical, material, mechanical and hydraulic tests shall be carried out at manufacturers’ premises. The extent and method of recording the results shall be agreed by the Purchaser in ample time to enable the tests to be satisfactorily witnessed or to make any changes to the proposed program of tests.

7.32.2 Material Tests:

The supplier shall provide test pieces free of charge as required to enable the quality of the material to be determined at the supplier’s expense. Purchaser may at its own discretion and by specific arrangement accept certified particulars of tests carried out in the absence of his authorized representative. 7.32.3 Type Test:

Type tests are required on all items to prove the general design of the goods offered. The Bidders shall submit the type test report of offered item from internationally reputed independent testing laboratory.

7.32.4. Routine Tests:

All items shall be subjected to routine tests in accordance with the relevant latest version of IEC, BS & BDS standards at the manufacturers works and shall include, but not be limited to, an operational test.

7.33 Technical Orientation and Quality Test Witness:

The Purchaser shall have the right to inspect/test the goods/materials to confirm their conformity to the specification. The purchaser shall be entitled at all reasonable time during manufacture to inspect, examine and test of goods/materials at the manufacturers’ premises, workmanship and performance.

The following test shall be carried out as per latest version of IEC or equivalent standard unless otherwise mentioned at the manufacturer premises or other places where the test facilities are available:-

Acceptance Tests:-

1. Measurement of turn ratio test; 2. Vector group test; 3. Measurement of winding resistance; 4. Measurement of insulation resistance; 5. Measurement of no load loss & no-load current; 6. Measurement of impedance voltage & load loss; 7. Dielectric withstands Tests; 8. Transformer oil test; 9. Temperature rise test.

The purchaser can carry out the testing of the transformer during Quality Test Witness. The

manufacturer will provide all arrangements for the testing of transformers desired by the purchaser in his factory.

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The Supplier shall, after consulting the purchaser, give the Purchaser reasonable notice in writing of the date on and the place at which any material or equipment will be ready for testing as provided in the contract and unless the purchaser shall attend at the place so named on date, which the supplier has stated in his notice, the supplier may proceed with the tests, which shall be deemed to have been made in the purchaser’s presence, and shall forth with forward to the purchaser duly certified copies of test readings. When the purchaser intends to attend the test he shall promptly inform the supplier accordingly in writing, so that he can take action. The purchaser shall give the supplier timely notice in writing of his intention to attend the test. Where the supplier provides for tests on the premises of the supplier or of any manufacturer of the supplier, except where otherwise specified, shall provide free of charge such assistance, labor, materials, electricity, fuel, stores, apparatus and instruments as may be requisite and as may be reasonably demanded to carry out such test efficiently. These test shall be performed as per relevant IEC/BS Standard or equivalent and only routine tests as agreed upon, will be performed. As and when the purchaser is satisfied that any materials/equipment shall have passes the tests referred to in this clause, purchaser shall notify the contractor in writing to that effect.

No goods shall be packed, prepared for shipment/ delivery unless it has been approved and written instructions have been received by the Purchaser.

7.34 Commissioning & Performance Test Methodology: 7.34.1 Commissioning

The Contractor shall be responsible for the commissioning of said transformer. The schedule shall cover all necessary inspections, adjustments and tests from no load to full rated capacity. The Board shall provide his operating and maintenance staff to gain familiarity with the installation but the Contractor shall remain fully responsible for safe operation of all equipment in his supply during the commissioning periods, and until the completion certificate have been issued.

7.34.2 Test Criteria

The transformers shall be completely assembled at the factory and shall be subjected to the following tests by the Contractor, in accordance with the latest revisions of IEC.

• General inspection • Measurements of Winding resistance • Voltage ratio measurement and check of polarity • Measurement of impedance voltages • Measurement of no-load loss and current • Measurement of load loss • Test of temperature rise • Induced over-voltage withstand test • Separate-source voltage-withstand test • Insulation resistance measurement (megger) • Results of shop tests to be submitted. • Results of type tests of lightning impulse-voltage withstand test • Test of protective relays • Characteristic test of bushing type current transformers • General mechanical checks. • Core and winding insulation tests. • Ratio and HV magnetising current tests. • Vector group check. • Motors overload protection tests. • Buchholz device tests.

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• Temperature instrument calibration and tests. • Operational tests on tap change equipment. • Dielectric strength tests of insulation oil.

7.35 Tests at Site

Responsibility for Tests a. The Contractor shall conduct the tests at the Site in accordance with these clauses and the conditions of the Contract.

b. The Contractor shall provide all equipment and personnel required to carry out the tests, including the provision, installation and removal of all test instruments, the connection and disconnection of plant items and obtaining of all records. c. The Contractor shall submit one copy of the results of each of the tests at the Site to BPDB within one week of the tests being carried out. BPDB personnel will observe and participate in the tests on completion.

The Contractor shall submit evidence to the Engineer that the instruments used for the tests have been calibrated at an approved testing laboratory within a period of up to 12 (Twelve) months. 7.36 Facilities Provided from Shikalbaha Power Station: 1. Documents/ drawings of existing Transformer, Foundation drawings etc. (if available) 2. Available tools.