Amended as. Clause no. Mentioned as per tender document. Page 1 of Preparation of Tender TDS: ITT 21.1(q) and Rejection Clause 10

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1 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 Preparation of Tender TDS: ITT 26.1(b) 3. Price Schedule for Goods (Form PG4-3B) 4. Price and Completion Schedule - Related Services (Form PG4-3D) 5. Specifications Submission and Compliance Sheet (Form PG4-4) 6. Section 6: Schedule of Requirements 7. Section 7: Technical Specifications 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. Manufacturer s authorization is: Required. Manufacturer s Authorisation Letter is required for the following items listed in Section 6: Schedule of Requirements: All items 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 in Clause 7.13 of Section-7) 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 As per attachment-1 As per attachment-1 As per attachment-1 As per attachment-1 As per attachment 1 N.B. All other terms and conditions of Tender document will remain unchanged. Page 1 of 36

2 Price Schedule for Goods (Form PG4-3B) [Group B Tenders: Goods Manufactured outside Bangladesh, to be imported] Attachment-1 (Page2-36) 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] Line Item No. Description of Item Manufacturer's Type/ Specifications Countr y of Origin Unit of Quantity Measurem ent 1 Power Transformer 132/33kV, 50/75MVA, 3-Phase Set 01 Power Transformer 2 33kV C.T. 800/1200/1600/5 Set 01 (03 Nos) 3 33kV VCB 1600A Set 03 4 Gantry Structure 1m:1m:3m (12 Set) & Lot 01 1m:1m:4m (08 Set) 5 Control Cable 4rm and 2.5rm Lot 01 6 Conductor ACSR Martin Lot 01 (2.5km) 7 PCM panel for 33kv Breaker As per in Section:7 Technical specification set 03 Note : Price offered in foreign currency (FC) & Bangladesh Taka Point of Delivery as per Schedule of Requirement: Shikalbaha 60MW Power Station Store. 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 Total Price per line on account item of Supplier if the Contract is awarded [Taka] Total Price for Lot Period of Delivery including Design, Supply, Installation, Testing & Commissioning as per Schedule of Requirement: *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 FC (Col. 8) Taka (Col. 9) 180 Days from L/C opening date Page 2 of 36

3 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] Description of Services Country of Unit of Quantity Unit price Price per line VAT Payable on (excludes inland transportation Origin Measurement of service item of service account of Supplier if and other services required in [FC] or the Contract is Bangladesh to convey the [Taka] (Col. 5 X Col. 6) awarded goods to their final destination) [FC] or [Taka] [Taka] Service No. 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) 02 Installation, Testing & Commissioning Lot 01 Lot 01 Note Price offered in foreign currency (FC) & Bangladesh Taka Point of Delivery as per Schedule of Requirement: Shikalbaha 60MW Power Station Store. Total Price for Lot 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 Page 3 of 36

4 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. A) 3 Phase Power Transformer Guaranteed Technical Data Sl. No. Description Unit Technical Data/ BPDB's requirement 1.1 Continuous Rating - ONAN 50 MVA 1.2 ONAF 75 MVA 1.3 Overall Dimension (LxWxH) 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 Type of Base On wheels with adequate size and 6 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 9.2 Manufacturer On load auto regulation and remote & manual control MR, Germany/ ABB, Sweden/ HM, China Technical Data to be filled up by tenderer/ manufacturer 9.3 Range % +/-10% 9.4 Size of Steps % 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 Page 4 of 36

5 Sl. No. Description open diverter switch contacts Unit Technical Data/ BPDB's requirement 9.6 Type test certificate reference submitted 10 Type of cooling ONAN/ONAF CMR Winding temperature rise at CMR under service conditions stated in Schedule of Technical Requirement Top oil temperature under service conditions stated in Schedule of Technical Requirement 12.2 ONAN Rating 13 Maximum hot spot temperature in core at rated power 14 Maximum hot spot temperature in winding at rated power 15 Temperature gradient at rating specified 16 Core Manufacturer s Name & Address Material of core & grading Core Loss/ Kg, supported by Characteristic Curve (to be submitted ) Thickness of core, mm Core Dia, mm Total weight of core, Kg 0 C 0 C 0 C 0 C ~114 0 C ~115 0 C 20 approx. 22 Flux density in iron at normal voltage and frequency and at normal ration (No load) 22.1 Cores Tesla < Yokes Tesla < Volts/Turn V ~ Magnetising Current (Approx.) at nominal ratio and 23.1 at 0.9 x nominal voltage % ~0.1 Technical Data to be filled up by tenderer/ manufacturer 23.2 at 1.0 x nominal voltage % ~ at 1.1 x nominal voltage % ~ at 1.2 x nominal voltage % ~ Harmonic component of magnetising current at rated voltage as percentage of fundamental 24.1 Fifth harmonic % 24.2 Seven harmonic % 25 No-Load Loss at rated voltage, ratio and frequency kw 26~32 26 Load Loss (excluding cooling fan losses) at 75 0 C and at rated voltage, ratio (nominal kw tap), frequency, 75 MVA & at ONAN 27 Load Loss (excluding cooling fan losses) at 75 0 C and at rated voltage, ratio (nominal kw 225~275 Page 5 of 36

6 Sl. No. Description Unit Technical Data/ BPDB's requirement tap), frequency, 75 MVA & at ONAF 28 Auxiliary loss (Cooling fan losses) at 75 MVA (Total power input to fans for kw operation of total installed cooling capacity) 29 Total loss at 75 0 C and normal ratio and 75 kw MVA (Sl.No ) 30 Regulation at 75 0 C and normal ratio At unit power factor % % ~ At 0.8 lagging power factor % ~ Impedance voltage at 75 0 C and CMR between HV & LV windings 31.1 at extreme minus tap % at normal tap % ~ at extreme plus tap % 31.2 Maximum Impedance over tapping range corresponding tap 31.3 Minimum Impedance over tapping range % Corresponding tap 32 Equivalent circuit zero sequence impedance: 32.1 HV - LV ~ Maximum current density in windings at C.M.R HV Winding A/mm LV Winding A/mm 2 34 Noise Level As per IEC db 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 37.2 LV 38 Copper Conductor's Manufacturer Name & Address 39 Material of windings - copper 40 Winding resistance of : 40.1 H.T. winding, Ohm L.T. winding, Ohm. 41 Current density of : 41.1 H.T. winding, Amps/sq. mm A/mm 2 Technical Data to be filled up by tenderer/ manufacturer Page 6 of 36

7 Sl. No Description Unit Technical Data/ BPDB's requirement L.T. winding, Amps/sq. mm A/mm 2 42 Outer, Inner & Mean dia of copper winding: H.T. winding, mm L.T. winding, mm 43 Size of Copper conductor/bar : H.T. winding SWG, dia. in mm / area in mm 2 L.T. winding SWG, area in mm 2 44 Number of Turns : 44.1 HT winding. nos LT winding nos. 45 Copper weight of windings : 45.1 HT winding Kg 45.2 LT winding Kg 46 Insulation of 46.1 HV Winding 46.2 LV Windings 47 Insulation of 47.1 Yoke bolts 47.2 Side plates 48 Safe working temperature of core plate insulation 49 Winding connections brazed or cripmed 50 For fault with zero impedance external to the transformer and infinite system 0 C Maximum axial force kn Maximum tensile stress in winding N/m 51 Is facility provided for adjustment of axial Yes/No pressure on windings 52 Thickness of transformer tank 52.1 Sides mm 52.2 Top Plate mm 52.3 Bottom Plate mm 52.4 Vacuum withstand capability of the tank Main tank Kpa Technical Data to be filled up by tenderer/ manufacturer Page 7 of 36

8 Sl. No Description Unit Technical Data/ BPDB's requirement Conservator Kpa Radiators Kpa 52.5 Provision of tank earthing Nos 53 Material used for gaskets for oil tight joints Radiators, Valves, Fans 54 Thickness of radiator plates mm 55 Valve type/material: mm and below 55.2 Above 100mm 56 Equipment for ONAF + Cooling state (A) 56.1 Radiators on main tank Yes 57 Number of coolers/radiators or cooler banks per transformer 58 Number of air blowers per transformer 59 Speed of air blowers rpm 60 Rating of each air blower motor 61 Starting current of each air blower motor A Oil Volumes and Weights 62 Total oil required including cooler system Litres 63 Volume of oil to fill transformer to above the top yoke Litres 64 Total volume of conservator Litres 65 Weight of active copper Tonnes 66 Weight of active iron in core Tonnes 67 Weight of core and winding assembly Tonnes Weight of each cooler bank complete with oil if mounted separately from transformer Total weights of complete transformers, including attached coolers, voltage regulating equipment, all fittings and oil Weight of transformer arranged for transport Manufacturer, type and class of oil to IEC 296 Tonnes Tonnes Tonnes 72 Drawing and manuals 2 copies Class-1 grade, insulating mineral oil, free from PCB (polychlorinated biphenyl) submitted with Transformer Technical Data to be filled up by tenderer/ manufacturer Page 8 of 36

9 B) Bushing Current Transformer: Sl. No. Description Unit Technical Data/ BPDB's requirement Transformer bushing 132 kv 33kV Neutral insulators 1 Maker 2 Insulator materials Oil paper Solid Solid (Solid, oil papner etc) 3 Maker's type reference and rated voltage 4 Rated current BCT particulars 5.1 HV Side Core 1.2 & Core 3 Core 1 & 2: /5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter 5.2 LV Side Core & Core 4 Core 1 & 2: /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 : /5A CL: 5P20 30 VA Core 2 : /5A CL: 5P20 6 Manufacturer of Porcelain 30 VA Technical Data to be filled up by tenderer/ manufacturer Page 9 of 36

10 Sl. No. Description Unit Technical Data/ BPDB's requirement Transformer bushing 132 kv 33kV Neutral insulators 7 Length of Insulators (Overall) mm 8 Weight of Insulator Kg 9 Electrostatic capacity pf >200 >90 >90 of complete bushing 10 Dry lightning impulse kv voltage withstand (1.2/50 wave) Hz wet withstand kv voltage without arcing horns 12 Creepage distance of outdoor shedding mm/ KV (min Protected creepage distance of sheding ) mm Technical Data to be filled up by tenderer/ manufacturer C) Current Transformer: Sl. Technical Data/ BPDB's Description Unit No. Requirement 1. Rated primary current A rms Rated secondary current A rms 5 3. Rated frequency Hz Highest voltage for equipment kv Rated insulation level - primary winding kv Lightning impulse withstand kv pk a) Power frequency withstand (dry) kv rms 70 b) Power frequency withstand (wet) kv rms Insulator creepage (phase to earth) mm/kv (min) 9. Electrical dissipation factor at power frequency test voltage 10. Rated short term thermal current for 3s KA Rated dynamic current ka pk Insulation class A 13. Secondary Core Details As per IEC Number of secondary windings 3 Location of core 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 Core - 3 Top of the Tank 5P20 Technical Data to be filled up by tenderer/ manufacturer Page 10 of 36

11 Rated Burden VA 30 Secondary Current A 5 Accuracy class 5P 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 No windings 20. Type test certificate ref/date Enclosed 21. Bushing Porcelain outdoor type 22. Standard IEC D) Details Specification of 33KV Vacuum Circuit Breaker: Sl Description Unit Technical data/ BPDB's Requirement 1. Type Vacuum Circuit Breaker 2. Number of Phase 3 (Three) 3. Operation Gang Operated 4. Service Voltage KV Maximum Rate Voltage KV Frequency Hz Normal Rated Current A Symmetrical Breaking Capacity MVA Asymmetry % Short Time Current Duration KA, Sec 31.5 KA, 3 Sec. 11. Making Current (Peak) KA KA Opening Time (Maximum) Sec Breaking Time Cycle Capacity of Vacuum Interrupter at rated short circuit current switching 15. Basic Insulation Level (1.2/50 Micro Second Wave) 16. Power Frequency Test Voltage (Dry) 17. Rated Operating Voltage of Closing / Opening coils 18. Rated Operating Sequence/ Duty Cycle 100 nos. of operations KV 170 KV, Hz, Min 70 KV at 50 Hz, 1 Min. V DC Sec CO 1 min CO 19. Standard Design, Manufacture, Testing, Installation and Performance shall be in Technical Data to be filled up by tenderer/ manufacturer Page 11 of 36

12 accordance with the latest edition of applicable IEC 6056 & IEC 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 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 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 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 Page 12 of 36

13 - 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 1. Name of the Item ACSR MARTIN 2. Name of the Manufacturer, Country of origin 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 Technical Data to be filled up by tenderer/ manufacturer 8. Overall diameter mm Nominal cross sectional area of mm conductor 10. Number/diameter of Aluminium No./ 54/4.02 Strand mm 11. Nominal Aluminium cross mm sectional area 12. Number/diameter of Steel Strand No./ 19/2.41 mm 13. Nominal Steel cross sectional area mm Weight of conductor Kg/K 2590 M 15. Drum wound length M Net weight Kg 17. Gross weight Kg 18. Maximum DC Resistance of Ω/K Conductor at 20 C M 19. Minimum breaking Load of Kg Conductor 20. Maximum working tension of KN conductor 21. Current rating at 35ºC rise over Amp 538 (min) 40ºC ambient temperature (75ºC) s. 22. Practical (final) modulus of hbar elasticity 23. Co-efficient of linear expansion /ºC 24. Aluminum to Steel Ratio Shall be 25. Lay length for Outermost Layer mm Shall be of Aluminium 26. Lay direction for Outermost Right hand Layer of Aluminium 27. Lay ratio for Outermost Layer of Aluminium 28. Treated Wooden Drum Standard AWPA C 1 82, C 2 83, C 16 82, P Page 13 of 36

14 F) Details Specification of PCM (Protecion, Control & Measuring) of 33KV Breaker: Sl. No. 33KV PCM PANEL Description Unit Technical Data/ BPDB's Requirement 1 Manufacturer s Name & - Country of panel 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 Type of relay - Numerical programmable 2.4 Directional Feature can be Yes/No Yes activated/de-activated 2.5 Range of current setting : a) Phase element b) Each fault element % of CT rating %of CT rating Sec 2.6 Range of timing settings at 10 time CT rating 2.7 Burden of relay at 10 time CT VA rating 2.8 Percentage of current setting % at which relay will reset 2.9 Reset time after removal of 10 time CT rated current for : a) Phase element (100%) Sec b) E/F element (40%) Sec METERING AND INDICATION 3. KWh Meter 3.1 Manufacture s Name & - Country 3.2 Manufacture s Model no Type of meter - Numerical programmable multifunction 3.4 Class of accuracy INDICATION VOLT & AMPERE METERS Technical Data to be filled up by tenderer/ manufacturer Page 14 of 36

15 Sl. No. Description Unit Technical Data/ BPDB's Requirement 4.1 Manufacturer s Name and -. Country 4.2 Manufacture s Model no Type of meter - Analogue 4.4 Class of Accuracy ANNUNCIATOR 5.1 Manufacturer s Name and. Country 5.2 Manufacturer s Model/type No.. 6. Trip Relays 6.1 Manufacturer s Name and -. Country 6.2 Manufacturer s Model/type No Operating Times ms < CONTROL SWITCH 7.1 Manufacturer s Name and. Country 7.2 Manufacturer s Model/type No.. Technical Data to be filled up by tenderer/ manufacturer 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] Page 15 of 36

16 Item No. Section 6. Invitation for Tender No: Tender Package No: Schedule of Requirements Date 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. Description of Item 1 Power Transformer Manufacturer's Specifications 132/33kV, 50/75MVA, 3-Phase Power Transformer Unit of Measure ment 2 33kV C.T. 800/1200/1600/5 Set (03 Nos) 3 33kV VCB 1600A Set 03 4 Gantry 1m:1m:3m (12 Set) & Lot 01 Structure 1m:1m:4m (08 Set) 5 Control Cable 4rm and 2.5rm Lot 01 6 Conductor ACSR Martin Lot 01 (2.5km) 7 PCM panel for 33kv Breaker As per in Section:7 Technical specification Set 03 Qty Point of Delivery [Final (Project Site) Destination as specified in TDS] Set 01 Shikalbaha 60MW 01 Power Station Store Delivery Date Required (in weeks) Earliest Delivery Date Latest Delivery Date 180 Days from the date of opening of L/C for whole of the Supply, Design, Installation, Testing & Commissioning Works 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. Page 16 of 36

17 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 Necessary Civil Works (Modification of Existing Transformer PAD, Bus bar connection and structure for 3 nos 33 kv VCB) 02 Installation, Testing & Commissioning 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 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) (b) (c) performance or supervision of on-site assembly and/or start-up of the supplied Goods; 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 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 Page 17 of 36

18 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) Maximum System Voltage, kv System Frequency, Hz 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 Basic Insulation Level, kv 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 Power transformers (General). IEC Power transformers (Temperature Rise). IEC Power transformers (Insulation Levels, Dielectric Tests and External Clearance in air). IEC Power transformers (Ability to Withstand short circuit) IEC Bushings for alternating voltages above 1 kv. IEC Method of determination of electrical strength of insulating oils. IEC Specification for unused mineral insulating oils for transformers and switchgear. IEC Measurement of transformer and reactor sound levels. IEC 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 Page 18 of 36

19 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 /33 KV, 50/75 MVA, 3-Phase Power Transformer 1 set 2. Current Transformer ( /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) 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 % 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 Page 19 of 36

20 Sl. No. Description Unit Technical Data open diverter switch contacts 9.6 Type test certificate reference submitted 10 Type of cooling ONAN/ONAF 11 Winding temperature rise at CMR under service conditions stated in Schedule of 0 C Technical Requirement 12 Top oil temperature under service conditions stated in Schedule of Technical Requirement 12.1 CMR 0 C 12.2 ONAN Rating 0 C 13 Maximum hot spot temperature in core at rated power 0 C ~ Maximum hot spot temperature in winding at rated power 0 C ~ Temperature gradient at rating specified 0 C 20 approx. 16 Core Manufacturer s Name & Address 17 Material of core & grading 18 Core Loss/ Kg, supported by Characteristic Curve (to be submitted ) 19 Thickness of core, mm 20 Core Dia, mm 21 Total weight of core, Kg 22 Flux density in iron at normal voltage and frequency and at normal ration (No load) 22.1 Cores Tesla < Yokes Tesla < Volts/Turn V ~ Magnetising Current (Approx.) at nominal ratio and 23.1 at 0.9 x nominal voltage % ~ at 1.0 x nominal voltage % ~ at 1.1 x nominal voltage % ~ at 1.2 x nominal voltage % ~ Harmonic component of magnetising current at rated voltage as percentage of fundamental 24.1 Fifth harmonic % 24.2 Seven harmonic % 25 No-Load Loss at rated voltage, ratio and frequency kw 26~32 26 Load Loss (excluding cooling fan losses) at 75 0 C and at rated voltage, ratio (nominal kw tap), frequency, 75 MVA & at ONAN 27 Load Loss (excluding cooling fan losses) at 75 0 C and at rated voltage, ratio (nominal kw 225~275 tap), frequency, 75 MVA & at ONAF 28 Auxiliary loss (Cooling fan losses) at 75 MVA (Total power input to fans for kw operation of total installed cooling capacity) 29 Total loss at 75 0 C and normal ratio and 75 MVA (Sl.No ) kw 30 Regulation at 75 0 C and normal ratio At unit power factor % % ~ At 0.8 lagging power factor % ~ Impedance voltage at 75 0 C and CMR between HV & LV windings 31.1 at extreme minus tap % Page 20 of 36

21 Sl. No. Description Unit Technical Data at normal tap % ~ at extreme plus tap % 31.2 Maximum Impedance over tapping range corresponding tap 31.3 Minimum Impedance over tapping range % Corresponding tap 32 Equivalent circuit zero sequence impedance: 32.1 HV - LV ~ Maximum current density in windings at C.M.R HV Winding A/mm LV Winding A/mm 2 34 Noise Level db As per IEC 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 37.2 LV 38 Copper Conductor's Manufacturer Name & Address 39 Material of windings - copper 40 Winding resistance of : 40.1 H.T. winding, Ohm L.T. winding, Ohm. 41 Current density of : 41.1 H.T. winding, Amps/sq. mm A/mm L.T. winding, Amps/sq. mm A/mm 2 42 Outer, Inner & Mean dia of copper winding: 42.1 H.T. winding, mm 42.2 L.T. winding, mm 43 Size of Copper conductor/bar : 43.1 H.T. winding SWG, dia. in mm / area in mm L.T. winding SWG, area in mm 2 44 Number of Turns : 44.1 HT winding. nos LT winding nos. 45 Copper weight of windings : 45.1 HT winding Kg 45.2 LT winding Kg 46 Insulation of 46.1 HV Winding 46.2 LV Windings 47 Insulation of 47.1 Yoke bolts 47.2 Side plates 48 Safe working temperature of core plate insulation 0 C Winding connections brazed or cripmed 50 For fault with zero impedance external to the transformer and infinite system Page 21 of 36

22 Sl. No. Description Unit Technical Data 50.1 Maximum axial force kn 50.2 Maxijum tensile stress in winding N/m 2 51 Is facility provided for adjustment of axial pressure on windings Yes/No 52 Thickness of transformer tank 52.1 Sides mm 52.2 Top Plate mm 52.3 Bottom Plate mm 52.4 Vacuum withstand capability of the tank Main tank Kpa Conservator Kpa Radiators Kpa 52.5 Provision of tank earthing Nos 53 Material used for gaskets for oil tight joints Radiators, Valves, Fans 54 Thickness of radiator plates mm 55 Valve type/material: mm and below 55.2 Above 100mm 56 Equipment for ONAF + Cooling state (A) 56.1 Radiators on main tank Yes 57 Number of coolers/radiators or cooler banks per transformer 58 Number of air blowers per transformer 59 Speed of air blowers rpm 60 Rating of each air blower motor 61 Starting current of each air blower motor A Oil Volumes and Weights 62 Total oil required including cooler system Litres 63 Volume of oil to fill transformer to above the top yoke Litres 64 Total volume of conservator Litres 65 Weight of active copper Tonnes 66 Weight of active iron in core Tonnes 67 Weight of core and winding assembly Tonnes 68 Weight of each cooler bank complete with oil if mounted separately from transformer Tonnes 69 Total weights of complete transformers, including attached coolers, voltage Tonnes regulating equipment, all fittings and oil 70 Weight of transformer arranged for transport Tonnes 71 Manufacturer, type and class of oil to IEC Class-1 grade, insulating mineral oil, free 296 from PCB (polychlorinated biphenyl) 72 Drawing and manuals 2 copies submitted with Transformer Page 22 of 36

23 7.8 Details Specification of Bushing Current Transformer: Sl. No. Description Unit Technical Data Transformer bushing 132 kv 33kV Neutral insulators 1 Maker 2 Insulator materials (Solid, oil papner etc) Oil paper Solid Solid 3 Maker's type reference and rated voltage 4 Rated current BCT particulars 5.1 HV Side Core 1.2 & Core 3 Core 1 & 2: /5-5A CL: 5P20 30 VA Core-3: Ratio, burden & accuracy class to be matched with WTI meter 5.2 LV Side Core & Core 4 Core 1 & 2: /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 : /5A CL: 5P20 30 VA Core 2 : /5A CL: 5P20 30 VA 6 Manufacturer of Porcelain 7 Length of Insulators (Overall) mm 8 Weight of Insulator Kg 9 Electrostatic capacity of pf >200 >90 >90 complete bushing 10 Dry lightning impulse voltage kv withstand (1.2/50 wave) Hz wet withstand voltage kv without arcing horns 12 Creepage distance of outdoor shedding mm/ KV Protected creepage distance of sheding (min) mm Page 23 of 36

24 7.9 Details Specification of Current Transformer: Sl. No. Description Unit Technical Data 1. Rated primary current A rms Rated secondary current A rms 5 3. Rated frequency Hz Highest voltage for equipment kv Rated insulation level - primary winding kv Lightning impulse withstand kv pk a) Power frequency withstand (dry) kv rms 70 b) Power frequency withstand (wet) kv rms Insulator creepage (phase to earth) mm/kv (min) Electrical dissipation factor at power frequency test voltage As per IEC Rated short term thermal current for 3s KA Rated dynamic current ka pk Insulation class A 13. Secondary Core Details Number of secondary windings 3 Location of core Top of the Tank Core - 1 Rated Burden VA 30 Secondary Current A 5 Accuracy class 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 5P 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 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 Page 24 of 36

25 5. Maximum Rate Voltage KV Frequency Hz Normal Rated Current A Symmetrical Breaking Capacity MVA Asymmetry % Short Time Current Duration KA, Sec 31.5 KA, 3 Sec. 11. Making Current (Peak) KA KA Opening Time (Maximum) Sec Breaking Time Cycle Capacity of Vacuum Interrupter at rated short circuit current switching 15. Basic Insulation Level (1.2/50 Micro Second Wave) 100 nos. of operations KV 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 Rated Operating Sequence/ Duty Cycle 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 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 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 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 Page 25 of 36

26 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 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) 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 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 Overall diameter mm Nominal cross sectional area of conductor mm Number/diameter of Aluminium Strand No./mm 54/ Nominal Aluminium cross sectional area mm Number/diameter of Steel Strand No./mm 19/ Nominal Steel cross sectional area mm Weight of conductor Kg/KM Drum wound length M Net weight Kg 17. Gross weight Kg 18. Maximum DC Resistance of Conductor at Ω/KM C 19. Minimum breaking Load of Conductor Kg 20. Maximum working tension of conductor KN 21. Current rating at 35ºC rise over 40ºC ambient temperature (75ºC) Amps. 538 (min) Page 26 of 36

27 22. Practical (final) modulus of elasticity hbar 23. Co-efficient of linear expansion /ºC 24. Aluminum to Steel Ratio Shall be 25. Lay length for Outermost Layer of mm Shall be Aluminium 26. Lay direction for Outermost Layer of Right hand Aluminium 27. Lay ratio for Outermost Layer of Aluminium 28. Treated Wooden Drum Standard AWPA C 1 82, C 2 83, C 16 82, P Details Specification of PCM (Protection, Control & Measuring) of 33KV Breaker: Sl. No. Description Unit Technical Data/ BPDB's Requirement 33KV PCM PANEL 1 Manufacturer s Name & Country of panel - 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 Type of relay - Numerical programmable 2.4 Directional Feature can be activated/de- Yes/No Yes activated 2.5 Range of current setting : a) Phase element b) Each fault element % of CT rating %of CT rating Sec 2.6 Range of timing settings at 10 time CT rating 2.7 Burden of relay at 10 time CT rating VA 2.8 Percentage of current setting at which % relay will reset 2.9 Reset time after removal of 10 time CT rated current for : a) Phase element (100%) Sec b) E/F element (40%) Sec METERING AND INDICATION 3. KWh Meter 3.1 Manufacture s Name & Country Manufacture s Model no Type of meter - Numerical programmable multifunction 3.4 Class of accuracy INDICATION VOLT & AMPERE METERS Page 27 of 36

28 Sl. Description Unit Technical Data/ BPDB's No. Requirement 4.1 Manufacturer s Name and Country Manufacture s Model no Type of meter - Analogue 4.4 Class of Accuracy ANNUNCIATOR 5.1 Manufacturer s Name and Country. 5.2 Manufacturer s Model/type No.. 6. Trip Relays 6.1 Manufacturer s Name and Country Manufacturer s Model/type No Operating Times ms < CONTROL SWITCH 7.1 Manufacturer s Name and Country. 7.2 Manufacturer s Model/type No.. 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 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 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 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. Page 28 of 36

29 Type Tests: a) Temperature Rise Test b) Lightning Impulse Test 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 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 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 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 below: CT = Capitalised cost of transformer loss = [(1+r) n 1] t e (P 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 P ,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%) Shipping: 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 Page 29 of 36

30 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 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 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 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 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 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. Page 30 of 36