1 SCOPE & INTENT OF SPECIFICATION

Transcription

1 1 SCOPE & INTENT OF SPECIFICATION Welspun Solar UP Private Limited. is setting up a 5 MW Solar PV Power Plant in state of Rajasthan at Village Deh, Tehsil Kolayat, District Bikaner 4.5MVA Inverter Transformer is to be designed as a five winding transformer with four 1. windings on LV side and one HV winding. The LV windings shall be connected to the inverter and as the name implies the inverter transformer shall step up the low voltage post inverter voltage to 33KV voltage level. However 1.15MVA transformer is two winding transformer with one winding on LV side & one at HV Side. The following is the brief of activities that outlines the scope & intent of specification of 2. transformer a. Design, engineering, manufacture and testing at works b. Supply of mandatory spares, recommended spares etc. c. Supply of radiator & HV/ LV Cable box support. d. Supply of Foundation bolts for the transformer and other associated systems. e. Supply of HV & LV cable termination nut & bolts of 8.8 grade (GI) with plain & spring washer. f. Transportation to site ( To be decide during PO Placement) g. Supervision of erection (Man days basis) 3. Bidder shall make the following arrangements:- a. Bidder shall furnish a list of tools, tackles and any other equipment required to carry out the unloading and erection of transformers at site. b. Bidder should ensure supply of all foundation details. c. All the transformer foundation bolts shall be dispatched to site within 2 weeks of transformer manufacturing clearance. 4. Terminal points :- a. At the HV & LV terminals of Transformers i.e via HV & LV Cable box. b. All power, control, indication, etc terminals of Transformer MB. 5. Exclusions :- a. All Civil Construction work & any major primary structural work. b. Cables and cabling beyond Transformer MB. The equipment offered by the bidder shall be complete in all respect. Any material and component not specifically stated in this specification and which is necessary for 6. trouble free operation of the equipment and accessories specified in this specification shall be deemed to be included unless specifically excluded. All such equipment and accessories shall be supplied without any extra cost. It is not the intent to specify completely herein, all aspects of design and construction of equipment. Nevertheless, the equipment shall conform in all respects to high 7. standards of engineering, design and workmanship and shall be capable of performing in continuous commercial operation. 8. Any deviation or variation from the Scope requirement and/or intent of the WSUPL1-WEL-631-TSP-0100 R1 Page 1 of 29

2 9. specification shall be clearly defined under Deviation Schedule of the Bid Proposal Sheets irrespective of the fact that such deviation/variations may be standard practice or a possible interpretation of the specification by the Bidder. Except for these deviations/variations covered under Deviation Schedules which are accepted by the Owner before the award of the Contract, it will be the responsibility of the Bidder to fully meet the intent and the requirements of the specification with in the quoted price. No other departure whatsoever from the specification except for the declared deviation submitted by the Bidder with his proposal shall be considered. Bids not complying with requirement shall be treated as non-responsive and hence liable for rejection. The interpretation of the Owner in respect of the scope, details and services to be performed by the Bidder, shall be binding, unless specifically clarified otherwise by the Owner in writing before the Award of Contract. 2 TECHNICAL PARAMETERS FOR (4.5MVA)TRANSFORMER of Parameter Parameters 1. Rating (KVA) 4500KVA 2. Vector Group Dy11y11y11y11 3. Cooling ONAN 4. Type Single HV & four LV winding transformer(4 winding) 5. Voltage ratio 5.a HV 33 kv 5.b1 LV1-LV2-LV3-LV4 (Option-1) 380V-380V-380V-380V 5.b2 LV1-LV2-LV3-LV4 (Option-2) 340V-340V-340V-340V 6. Frequency 50 Hz 7. Winding Connection(HV/LV) Delta/Star- Star-Star-Star 8. % Impedance at nominal tap 9. Service Outdoor Inverter Duty 7% (Between HV-LV1, HV-LV2, HV-LV3 & HV-LV3 at 25% KVA base). Minimum 10-12% between LV1-LV2-LV3-LV4 10. Duty Cycle Peak Loading of 5hrs in 24 hrs cycle. 11. Overload capacity 12. Configuration 13. a. b. Temperature rise over 50 C ambient Top oil measured by thermometer Winding measured by resistance method As per IS: / IEC No load limit imposed by bushings, taps etc. Core shall be 2 tier formation with HV/LV1, HV/LV2 in one magnetic circuit and HV/LV3 and HV/LV4 in another magnetic circuit. Refer Fig-1 40 C 45 C WSUPL1-WEL-631-TSP-0100 R1 Page 2 of 29

3 c. Max. Design Ambient temp. 50 C 14. Windings HV LV1 LV2 LV3 LV4 Full wave impulse withstand 170 a voltage One min. power frequency b. withstand voltage (rms) c. Winding connection Delta Star Star Star Star d. Insulation Uniform Uniform Uniform Uniform Uniform 15. Tap Changer a. Tap range + 10% to -10% in steps of 2.5% b. Tap control OCTC 16. Bushing details HV LV1 LV2 LV3 LV4 a. Rated Highest system Voltage (kv) b. Basic Insulation level One minute power frequency c. withstand voltage (rms) d. Rated current (A) 250A 3150A 3150A 3150A 3150A e. LV Winding Inverter transformer 17. Terminations 18. Clearances Shall be designed with switching impulse of 15kVp and separate source withstand voltage level of 10kV rms. The Bushing shall be 3.6kV Grade. Cable box on both HV & LV side (LV Neutral terminals need not required to be brought out) All the clearances shall be in line with the insulation level mentioned 19. Noise level As per limits mentioned in NEMA TR1(85dB) 20. a. b. Loss Capitalization formulae for LD No load loss capitalization figure Full Load loss capitalization figure LV Cable Box As per CBIP manual (For 8 hours, 325 days,15 years, 25% cyclic loading, & Rs 5.45 per unit charge, rate of interest@11%). To be quoted by the bidder, subject to capitalization. & loss verification to be done by ERDA To be quoted by the bidder, subject to capitalization. & loss verification to be done by ERDA 1) It shall be possible to terminate 4Rof 1Cx300sqmm copper cable on each terminals 2) Proper support arrangement shall be provided in the terminal bus bar along with flexible. 3) In case required, detachable type radiators may be provided. 4) If required LV Box Can be Splitted into Two. WSUPL1-WEL-631-TSP-0100 R1 Page 3 of 29

4 3 TECHNICAL PARAMETERS FOR (1.15MVA)TRANSFORMER of Parameter Parameters 1. Rating (KVA) 1150KVA 2. Vector Group Dyn11 3. Cooling ONAN 4. Type Two winding transformer 5. Voltage ratio 5.a HV 33 kv 5.b1 LV (Option-1) 380V 5.b2 LV (Option-2) 340V 6. Frequency 50 Hz 7. Winding Connection(HV/LV) Delta/Star- Star-Star-Star 8. % Impedance at nominal tap 5% (Between LV-HV on 100% KVA base) 9. Service Outdoor Inverter Duty 10. Duty Cycle Peak Loading of 5hrs in 24 hrs cycle a. b. Overload capacity Temperature rise over 50 C ambient Top oil measured by thermometer Winding measured by resistance method As per IS: / IEC No load limit imposed by bushings, taps etc. 40 C 45 C c. Max. Design Ambient temp. 50 C 13. Windings HV LV Full wave impulse withstand 170 a. 15 voltage One min. power frequency b. withstand voltage (rms) c. Winding connection Delta Star d. Insulation Uniform Uniform 14. Tap Changer a. Tap range + 10% to -10% in steps of 2.5% b. Tap control OCTC 15. Bushing details HV LV a. Rated Highest system Voltage (kv) WSUPL1-WEL-631-TSP-0100 R1 Page 4 of 29

5 b. Basic Insulation level 170 One minute power frequency c. withstand voltage (rms) d. Rated current (A) 250A 3150A e. LV Winding Inverter transformer 16. Terminations 17. Clearances - Shall be designed with switching impulse of 15kVp and separate source withstand voltage level of 10kV rms. The Bushing shall be 3.6kV Grade. Cable box on both HV & LV side (LV Neutral terminals not required to be brought out) All the clearances shall be in line with the insulation level mentioned 18. Noise level As per limits mentioned in NEMA TR1(85dB) 19. a. b. Loss Capitalization formulae for LD No load loss capitalization figure Full Load loss capitalization figure LV Cable Box As per CBIP manual (For 8 hours, 325 days,15 years, 25% cyclic loading, & Rs 8.50 per unit charge, rate of interest@11%). To be quoted by the bidder, subject to capitalization. & loss verification to be done by ERDA To be quoted by the bidder, subject to capitalization. & loss verification to be done by ERDA 5) It shall be possible to terminate 4Rof 1Cx300sqmm copper cable on each terminals 6) Proper support arrangement shall be provided in the terminal bus bar along with flexible. 7) In case required, detachable type radiators may be provided. 4 CODES & STANDARDS Indian Standards No. Title International & internationally recognized standards IS: 2026 Power transformers IEC: IS: 3639 Fittings & accessories for power transformers IS: 335 Insulating oil for transformers and switchgear IEC: 60296, BS:148 IS: 2099 Bushing for alternating voltages above 1000 V IEC: 60137, BS: 223 IS: 2705 Current transformers IEC: IS: Degree of protection provided by enclosure for low IEC: Part-I voltage switchgear & control IS : 5 Colours for ready mix paints IS: 1866 Code of practice for maintenance & Supervision of mineral insulating oil in equipment IS: 6272 Industrial cooling fans WSUPL1-WEL-631-TSP-0100 R1 Page 5 of 29

6 IS: 6600 Guide for Loading of oil immersed transformers IEC: IS: 3347 Specification for dimensions of porcelain bushing IS: 9434 Guide for sampling & analysis of free & dissolved gas IEC: 567 & oil from oil filled electrical equipment IS: Code of practice for selection installation & maintenance of transformers IS: 1866 Code of practice for maintenance & Supervision of mineral insulating oil in equipment High Voltage Test Technique IEC: IEEE Guide for Partial Discharge Measurement in Liquid-Filled Power Transformers and Shunt Reactors IEEE C PERFORMANCE of Parameter 1. Maximum flux density in any part of 1.7 Tesla at 110% continuous rated core at rated MVA & frequency Voltage Short time withstand current capacity To withstand mechanical & thermal 2. for external short circuit between three effects of through fault current for 2 phase terminals & phase to earth. (33KV seconds without any damage (As per IS System fault level : 25KA for 1 sec) 2026) 3. Transformer design For high switching impulses on LV side. 4. Over voltage operation without injurious heating 110% rated voltage continuous 125% rated voltage for 1 minute 140% rated voltage for 5 seconds 5. Over Fluxing Capability 110% continuous 125% for 1 min, 140% for 5 sec. 6. Air core reactance of HV winding Not less than 20% 7. Voltage variation + 10 % to -10% in steps of 2.5% Loading of transformer In accordance with IEC60354 upto load 8. of 150%. 9. Frequency variation ± 5% 10. Combined variation 10% Maximum oil velocity Not to cause any static discharges in 11. transformer 12. Oil flow in any part of winding 1 m/s maximum 13. Current density 3 A/sq mm. (Max.) Guaranteed No Load Current at 100% Rated voltage Minimum pressure the device is set to Rupture: -PRV <1% of full load rated current. 0.4kg/cm2 (approx) WSUPL1-WEL-631-TSP-0100 R1 Page 6 of 29

7 6 CONSTRUCTION 6.0 Transformer construction-tank & accessories Tank sheet steel Commercial grade Low carbon steel of adequate thickness capable of 1. withstanding thermal pressure of 35KN/Sqmm over normal oil pressure & also the short circuit forces. Tank welding testing By DP test before painting. Welding free from undercut, overlap, crack, porosity, 2. out of alignment of plate surface in butt joints, maximum gap due to incorrect fit up of fillet joint etc. 3. Tank with lifting lug For lifting tank with core, winding & oil Stiffener Gasket Bolted connections of all covers & flanges Type of tank construction (Conventional type) Shall be provided with tank wall to ensure rigidity. All removable covers with weather proof, hot oil resistant gasket, shall be of Buna-N rubber (Nitrile) type. Fitted with weatherproof, hot oil resistant rubberized cork gasket with metallic stoppers to prevent over compression As per manufacturer design 6.1 Transformer Core Core material High Grade Low Loss Silicon steel 1. laminations CRGO grade equivalent to M4 of maxm. Thickness of 0.27mm. 2. Current carrying capability Limited by the capacity of core & coils Solid Insulation Insulation between core and bolt / clamps Core Hot spot temperature 6. Facility to Megger core & clamping structure 7. Lifting lugs for core & winding To be provided The solid insulation quantity should be 30% higher. To withstand 2kV rms for 1 minute in air Limited to 125 C at full load with voltage excitation of 100% or 105%. To be provided outside tank 8. Placement of core & winding 1) Double winding core. WSUPL1-WEL-631-TSP-0100 R1 Page 7 of 29

8 2) Two tier winding arrangement 3) Both tiers carry two LV & Corresponding HV 4) The HV to be taken out for transformer on single connection. 5) LV winding will have individual connection 6) The Core should be placed inside tank to create enough margin for taking out leads from transformer bottom 6.2 Transformer Winding 1. Winding material High Grade Electrolytic Copper Winding & connectors Shall be braced to withstand shocks due to 2. rough handling & forces due to short circuit, switching or other fast transients due to semiconductor switching. Magnetic Shielding Provision of Faraday s Shield between HV 3. & LV and also between two LVs with IR testing & earthing point outside transformer through bushing. 4. Winding assembly shop Dust proof air sealed area 5. Winding conductor of electrolytic grade Free from scales & burrs 6. Winding insulation class Class A 7. winding insulation Uniformly insulated 6.3 Transformer Insulating oil Insulating oil New unused oil shall conform to all parameters as per IS: 335.Oil shall be pure 1. hydrocarbon mineral oil, clean, free from moisture, and have uniform quality throughout. 2. Oil sampling Before commissioning 3. BDV 60kV min 4. Moisture content 20 ppm 5. Resistivity at 90 deg C 35 X 10exp(-12)ohm cm WSUPL1-WEL-631-TSP-0100 R1 Page 8 of 29

9 6.4 Transformer Bushings 1. Relevant standard IEC Bushing type a) HV : Solid porcelain b) LV: Solid Porcelain Or Flat Bus Bar 2. encapsulated Epoxy c) Vertical or Horizontal connection Porcelain used for bushing Homogeneous & shall be roughly vitrified, 3. tough & impervious to moisture. 4. Current carrying parts of bushing Shall be copper or copper alloy. 5. Bushing current ratings Shall be derated for top-oil temperature rise greater than 55ºC Transformer terminations Transformer termination Suitable for Cable connection a) HV : 1RX3Cx95sqmm b) LV1: 4Rx1Cx300sqmm, Cu c) LV2: 4Rx1Cx300sqmm, Cu d) LV3: 4Rx1Cx300sqmm, Cu e) LV4: 4Rx1Cx300sqmm, Cu Cable Box at HV side as well as LV side a) HV Cable box shall be phase segregated upto 350mm from Top of the cable box. b) Minimum clearance from gland plate to bus bar shall be 800mm c) Shall be air insulated type and shall be of sufficient size to accommodate cable along with it s termination. d) The HV termination should be through a bus arrangement & supported by insulator. e) The LV Busbar should be supported by suitable insulator at two places from box. f) The LV cable termination busbar should have flexible connection between bushing & bus to avoid transfer of cable load on main bushing g) The LV side cable box should have provision of termination as follows :- h) 1)LV1 :- R1,Y1,B1 i) 2)LV2 :- R2,Y2,B2 j) 3)LV2 :- R2,Y2,B2 WSUPL1-WEL-631-TSP-0100 R1 Page 9 of 29

10 k) 4)LV2 :- R2,Y2,B2 l) Cable boxes shall have bus bars / terminal connectors of adequate size & bolt holes to receive cable lugs. m) Cable boxes shall be designed such that it shall be possible to move away the transformer without disturbing the cable terminations, leaving the cable box on external supports. n) Cable boxes shall have removable top cover & ample clearance shall be provided to enable either transformer or each cable to be subjected separately to high voltage test. o) Copper Flexibles of preferably braided copper of min 100 mm lengths shall be provided in each phase of HV & LV. p) Clearance in HV Cable box shall be as per CBIP+15mm q) LV cable box clearance Phase to Phase: 180mm (min) Phase to Earth: 150mm r) FRP Plate partitioning between phase to phase terminals throughout the box. The FRP fixing shall be detachable type such that during cable termination it shall be possible to remove the plate and fix later on. s) LV1/LV2/LV3/LV4 shall have metallic separation. Each box can be separate also. Support structure of cable box Galvanized iron and this support shall be 3. from ground along with structure for cable clamping support. 4. Earthing of cable box Suitable for 50 X 8 mm GI flat 5. Cable terminating accessories To be furnished by contractor 6. Provision of Water drain To be kept at the bottom most portion. 7. Gland plate Non ferrous (aluminum) and holes to be made at works as per owner s requirement. Holes to be drilled in gland plate(size shall be intimated during GA Approval).The no. of holes shall be :- HV Side: - 1 No. LV side :- 13 No/ LV WSUPL1-WEL-631-TSP-0100 R1 Page 10 of 29

11 6.6 Conservator & Oil preservation system 1. Replacement of air cell Possible 2. Conservator shall be provided with 3. Magnetic oil level gauge Oil filling cap Oil draining plug Diaphragm Required with potential free contacts for low level alarm & indication 4. Buchholz relay Fixed on pipe between conservator tank 5. Sealing system in conservator Air cell made of flexible urethane / Nitrile rubber reinforced with nylon cloth 6. Air cell operating temperature 100 deg C continuous 7. Isolation valve between conservator & tank Required 8. Air cell connection to conservator top By air proof seal 6.7 Grounding pads 1. Grounding Pads Shall be copper plated or ANSI 302 stainless steel. 2. Two grounding pads, located on opposite sides of shall be provided for connection to station the tank ground mat 3. M10 GS Bolts and spring washers shall also be provided for connection to 50x6 mm 2 GS Flat. 6.8 Valves 1. Valves up to 100mm dia Gun metal or cast steel Valve type Full way with internal screw opening 2. when turned anti clockwise direction 3. Valve locking & position indication Required 4. Valve gland packing Teflon rope or nitrile rubber 5. Oil sampling valve Suitable for fixing 50mm rubber hose 6. Valve internal surface treatment One coat of oil resistant varnish 7. Sampling & drain valve leakage rate Zero 8. All hardware for valves Electro galvanized WSUPL1-WEL-631-TSP-0100 R1 Page 11 of 29

12 6.9 Painting & labels 1. Surface preparation method 7 tank pretreatment or shot blasting 2. Paint for frame parts & transformer tank internal Two coats of heat resistant paint surface chemically inert to insulating oil 3. Paint for inner surface of the Marshalling box, Two coats of polyurethane paint, shade Cooler control panel white 4. Paint for outer surface of the transformer tank, conservator, radiator, marshalling box, cooler Two coats of polyurethane paint, shade is RAL 5012) control panel 5. Paint dry film thickness 80 microns minimum Labels for all fittings on transformer tank, valves, Anodized aluminum plate of 1mm relays, bushings etc. thickness with black letters Rating & diagram plate Stainless steel plate to show following - 1) manufacturer's name, serial number 2) month & year of manufacture 3) rated voltages, current & frequency 4) rated power in KVA 5) type of cooling (ONAN) 6) vector group symbol 7) basic insulation level 8) impedance at principal tap 9) losses at rated voltage and frequency 10) top oil and winding temperature rise 11) winding connection diagram 12) weight of radiator 13) transport weight of tank 14) total weight 15) volume of oil in tank & radiator 16) WCT, details 17) type of OCTC & tapping details 18) name of the purchaser 19) PO no and date 6.10 Accessories & Fittings within transformer 1. Conservator with air cell, MOG, drain valve, filling valve, silica gel breather, isolation valve 2. Buchholz relay double float type with alarm & trip contacts, air release plug, oil / gas sampling & collection device with bleed valve & copper piping, isolation valves 3. Pressure relief device with alarm / trip contacts, with canopy 02 Nos 4. Inspection covers WSUPL1-WEL-631-TSP-0100 R1 Page 12 of 29

13 5. Plain Rollers for transformer installation on Embedded channel. 6. Bushings for HV, LV terminals 7. Lifting lugs 8. Jacking Pad 9. Protected type thermometer in pocket 10. Bottom & top filter valve on main tank and main oil header 11. Sampling valve & drain valve on main tank 12. Rating & diagram plate of stainless steel material on transformer & auxiliary apparatus mm dial type oil temp indicator with alarm and trip contacts, maximum reading pointer and resetting device. Accuracy class shall be ±1.5 % or better 150 mm dial type Winding temp indicator for each winding with alarm and trip 14. contacts, maximum reading pointer and resetting device. Accuracy class shall be ± 1.5 % or better 15. Duplex or equipment platinum RTD to be provided for remote winding temp indication. In addition 4-20 ma signal to be provided for Remote WTI and OTI signals 16. Common Marshalling Box 17. HV and LV termination designation to be affixed near their location for proper identification. 18. Gas collecting device along with gas collecting pipe to be furnished. 19. Insulating oil with 10% excess oil for first filling 20. Drain valves / plugs shall be provided in order that each section of pipe work can be drained independently 21. Earthing link on gasketted joints of plates to be furnished for e.g. bushing turrets, tank cover, marshalling box etc. 22. Terminal marking plates 23. Valves and de-aerating point schedule plates 24. Two (2) earthing terminals on all the equipment mounted separately suitable for connection to 75 x 12 mm GI flat along with2 Nos. tapped holes M10 bolts etc 25. Control cable between MB & fittings Lot 26. Foundation bolts (to be furnished by the contractor) for anti earth quake clamping, shield earthing bushing. 27. Handle for operating OFF circuit tap switch Protective device The protective device for the transformer is as follows:- a OTI (Oil Temperature indicator) trip at adjustable temperature. b WTI (Winding Temperature indicator) trip at adjustable temperature. This instrument indicates the hot spot temperature of the winding & thus provides protection for winding against overheating. WSUPL1-WEL-631-TSP-0100 R1 Page 13 of 29

14 c d Bucholz relay for tripping in case of gas generated inside transformer body. Pressure Relieve valves are employed to prevent bursting of transformer tank in case of sudden rise of the internal pressure Common Marshalling box(mb) Common marshalling To be furnished 2. box 3. Panel construction Sheet steel 1.6m thickness 4. Gasket for doors Neoprene rubber Space heater & panel light with door To be provided 5. limit switch, 5/15 amp power socket & removable gland plate. 6. Terminal block wire connections Suitable for 2x2.5 sq mm Copper wire Mounting of indicating instruments At 1200mm height from panel bottom with 7. transparent glass window 8. Degree of ingress protection for CMB IP55 9. Auxiliary power supply for CMB panel Two 415v, 50Hz 3 phase 4 wire power supplies by Purchaser 10. Control wiring & cabling By PVC wires with color coding, 2.5 sq mm stranded copper conductor with armor 11. Earth bus GI flat 75x10 mm at bottom 6.13 OCTC tap changer 1. Range + 10 % to -10% in steps of 2.5% 2. Operation of tap By external hand wheel 3. Tap position indication Required along with pad locking Mechanism for manual operation to be provided with 1) Warning plate Operate when transformer is de energized 2) Facility to prevent over cranking 3) With removable handle / cranking device The OCTC internal arrangement construction philosophy shall be provided by the bidder with the offer. 7 INSPECTION & TESTING WSUPL1-WEL-631-TSP-0100 R1 Page 14 of 29

15 1. Comprehensive inspection & testing To be submitted by Bidder including program testing required by Purchaser 2. All type test, routine test, site tests & Bidders quality plan to include all tests testing of all bought out items specified by Purchaser 3. Make of all bought out items Subject to approval by Purchaser Testing of all bought out items Intimation for testing & inspection by Purchaser Test lab facility details available with Bidder for carrying out each test Cost of tests which are not possible to be done at his own works Stage Inspection Typical test plan Testing plan / copy of test report to be submitted to Purchaser for approval 15 days in advance for inspection of transformer completely assembled with all fittings Data to be submitted with Bid to Purchaser for review Bidder to bear the cost 1) Core Cross- section (During/after Core Formation 2) Conductor Cross section (During/ After Core Formation Test First unit Other units Category Measurement of winding resistance Routine Voltage ratio measurement Routine Polarity test Routine No-load loss and current measurement Routine Impedance voltage and load loss Routine measurement Separate source voltage withstand test Routine Measurement of insulation resistance Routine Core assembly dielectric and earthing Routine continuity test Oil leakage test on transformer tank Routine Appearance, construction and dimension check Measurement of no-load current with 415 V, 50 Hz AC on LV side. High voltage withstand test on auxiliary equipment and wiring after assembly Measurement of insulation power factor and capacitance between winding and earth Determination of transient (Impulse) voltage transfer characteristics Routine Routine Routine Special Special NA WSUPL1-WEL-631-TSP-0100 R1 Page 15 of 29

16 Measurement of acoustic noise level. Special NA Measurement of harmonic level in no-load Special NA current. Temperature rise test Type NA Lightning impulse test Type NA Tank vacuum test Type NA Tank pressure test Type NA 10. Type tests a. Type tests on one transformer unit 1) Tank vacuum test 2) Tank internal pressure for test 3.33 kn/m2 absolute (25 torr) for one hour 3) permanent deflection of tank plate after the vacuum has been released not to exceed the values specified below (reference CBIP manual) Horizontal Length of Flat Plate (in Permanent deflection (in mm) mm) Up to and including to to to to to to Above ) Tank pressure test 5) Pressure for test Normal head of oil or normal pressure plus 35 kn/m2 whichever is lower, measured at the base of the tank for one hour 6) Permanent deflection on the plates after Not to exceed the figure specified above for releasing pressure vacuum test 7) Measurement of capacitance and Special test tan delta b. Type tests on components 1) Degree of ingress protection (IP55) test on MB 2) All type test on bushings As per IEC60137 Temperature rise test To be performed on a tap corresponding to c. maximum losses. The test shall be carried out at minimum 110 % of rated Current with rated cooling. 11. Routine tests ON each transformer single phase unit WSUPL1-WEL-631-TSP-0100 R1 Page 16 of 29

17 1) Measurement of no load loss, no load current 2) Dielectric tests As per IEC Additional tests At 90%, 100% & 110% of rated voltage Repeat the test after completion of all tests. At 415 V, 50 Hz AC supply 1) Jacking test followed by D.P. test On tank with oil & core coil assembly Core insulation test with 2 kv voltage 2) Insulation Resistance measurement Pre shipment checks Between core & tank, clamp & tank, core & clamp at manufacturers works 1) Check for interchangeability of similar transformers for mounting dimensions. 2) Check for proper packing and reservation of accessories like coolers, bushings, dehydrating breather, rollers, Buchholz relay, fans, control cubicle, connecting pipes, conservator etc 3) Check for proper provision for bracing to arrest the movement of core and winding assembly inside the tank 4) security arrangements for valves & fittings to avoid damage during transport Inspection at site 15. Receipt & storage checks Comprehensive program of inspection to include Purchaser requirement given below 1) Check and record reading of impact at receipt and verify the allowable limits as per manufacturer's recommendation 2) Check and record condition of each part & fitting 3) Visual check for wedging of core and coils before filling up with oil and also check conditions of core and winding in general 16. Installation check 1) Inspection and performance testing of accessories like tap changersetc. 2) Check the bearing lubrication. 3) Check whole assembly for tightness, general appearance etc. 4) Oil leakage test. 5) Check oil sample prior to filling. 6) Connection checks for neutral 17. Commissioning checks a) Check the color of silica gel in silica gel breather. b) Check the oil level in the breather housing, conservator tanks, Condenser -bushing etc. c) Check for correct operation of protection devices and alarms: (1) Buchholz relay. (2) Gas detection relay on top of conservator (3) Excessive winding temperature (4) Excessive oil temperature (5) Pressure relief valve Check for the adequate protection on the electric circuit supplying the Accessories. a) Check resistance of all windings on all steps of the tap changer b) Conduct Insulation resistance measurement for the following: WSUPL1-WEL-631-TSP-0100 R1 Page 17 of 29

18 (1) Control wiring. (2) Main windings (3) Tank and turret mounted CTs (4) Core and clamp - Core to earth - Core clamp to earth - Core to core clamp a) Check for cleanliness of the transformer and the surroundings. b) Check the following (1) Direction and overload setting of cooling accessories (2) Buchholz, oil level indicator, pressure gauges, temp indicators etc. for fitting and operation. (3) Earthing of main tank, marshalling box (4) Neutral earthing (5) Calibration of WTI and OTI (6) Earthing of bushing test taps (7) Connection of WTI CT with its heater (8) Tightness of CT secondary connection and shorting of unused CTs (9) All tap changers on the same position (10) All valves for their correct opening and close sequence a) Phase out and vector group test. b) Ratio test on all taps. c) Magnetising current test (HV winding and LV winding). d) Measurement of noise level. e) Oil dielectric strength test-the various test on oil shall be conducted prior to filling in main tank at site and prior to energisation at site as specified elsewhere in the specification. Oil samples are to be drawn from top and bottom of main tank, cooling system. f) Core isolation test g) Short circuit impedance measurement h) Test on tank/turret mounted CTs (1) IR value between secondary winding-earth and between windings (2) Secondary resistance (3) Polarity (4) Ratio test (5) Magnetization current 8 SUBMISSION OF DOCUMENTS Document to be submitted with the Bid For approval after award WSUPL1-WEL-631-TSP-0100 R1 Page 18 of 29

19 1. Guaranteed technical particular sheet 2. List of deviation with reference to specification clause number 3. Type test certificate on similar transformer 4. Quality Assurance Plan 5. General arrangement drawings showing all dimensions & disposition of cooler banks, fittings, terminal arrangement etc 6. Transport/shipping dimensions and weights 7. Technical catalogue for major fittings, relays, WTI& OTI indicator, OCTC etc. 8. Foundation plan & loading data 9. Terminal arrangements 10. GA of Marshalling Box 11. Control schematics and wiring diagrams for marshalling box 12. GA for OCTC mechanism 13. Rating and Diagram Plate Cable Interconnection Diagram and Cable schedule General arrangement drawings of HV & LV Cable box 16. General arrangement of conservator 17. Valve schedule plate drawing Test reports of transformer and auxiliary 18. equipment after testing of unit Calculation for a) winding hot spot temperature, b) current density & 19. c) value of losses no load, rated load & Stray Losses c) flux density 20. Transformer : Construction Write -up 21. OCTC Construction write-up 9 MANDATORY SPARES This list of spare comprises of spares envisaged for transformer:- WSUPL1-WEL-631-TSP-0100 R1 Page 19 of 29

20 Sl. No. List of spares UOM Quantity 1. HV Bushing with metal parts and gaskets Set (1R+1Y+1B) 1 2. LV bushing with metal parts and gaskets Set 1 3. Pressure relief device No 1 4. MOG No 1 5. Buchholz relay complete No 1 6. Set of gaskets for complete transformer Set 2 7. Silica gel breather No 2 8. Diaphragm for PRD ( if provided ) No 1 9. OTI No WTI No 1 10 Bill of Quantity (5MW) 1 1 The Bill of Quantity envisaged is as follows:- UOM Quantity 1. 33KV/4x380V, 4.5 MVA Transformer (or) No. 1 1(a) 33KV/4x340V, 4.5 MVA Transformer No KV/380V, 1.15 MVA Transformer (or) No. 1 2(a) 33KV/340V, 1.15 MVA Transformer No Supervision of erection & commissioning Mandays 5 4. Foundation bolts (Roller locking, radiator support & Cable Lot 01 box support) 5. HV & LV Cable termination GI Nut & Bolt (8.8grade) with Lot 01 Plain & spring washer 6. Kit for Aircell Charging consisting of (Pressure Gauge (0-5psi), Nos 01 suitable valve & Min 2 meter connecting pipe with flange 7. Standard Thermometer No Spare gasket for buchholz, PRV, Bushing, Radiator Set O- Ring For Air release plug Set 01 WSUPL1-WEL-631-TSP-0100 R1 Page 20 of 29

21 ANNEXURE-A GENERAL TECHNICAL PARTICULARS (To be filled separately for transformer) Particulars Data to be filled by bidder (B) 1. Make 2. Type 3. Number of windings per phase 4. Reference Standard 5. Rating a. Type of cooling b. Rated output(mva) 8) With ONAN cooling c. Rated Voltage (KV) 9) HV 10) LV1/LV2 d. Rated Current (A) 11) HV 12) LV1/LV2 e. Rated Frequency (Hz) f. Vector Group after 3 phase connection g. Voltage Withstand Time 110% of rated voltage 125% of rated voltage 150% of rated voltage h. Overfluxing Capability For Overfluxing Factor 1.10 For Overfluxing Factor 1.25 For Overfluxing Factor 1.40 For Overfluxing Factor Temperature a. Reference(Ambient Temperature) b. Temperature rise over reference ambient Deg. C Of top oil by thermometer WSUPL1-WEL-631-TSP-0100 R1 Page 21 of 29

22 Of winding by resistance Maximum continuous over loading capacity of transformer without c. exceeding the specified winding temperature 7. Tapping a. Type b. Capacity c. Range- Steps X % Variation d. Taps provided on HV winding Yes /No 8. Impedances at Principal Tap at Rated Frequency and 75 C winding temperature Impedances at Lowest Tap Impedances at Highest Tap Tolerance for impedance ±1% between all single phase units Resistance of HV & LV winding Zero sequence impedance of HV & LV winding 9. Suitable for Outdoor continuous service YES / NO Basic insulation level HV winding Lightning impulse withstand voltage 10. Basic insulation level LV winding One minute power frequency withstand voltage Lightning impulse withstand voltage 11. Basic insulation level HV & LV neutral One minute power frequency withstand voltage Lightning impulse withstand voltage 12. HV bushing make & type HV bushing rated current in Amp Rated thermal short time current HV bushing rated voltage HV bushing 1 minute power frequency withstand voltage HV bushing lightning impulse withstand voltage Star connection WSUPL1-WEL-631-TSP-0100 R1 Page 22 of 29

23 HV bushing minimum creepage distance in mm HV bushing maximum tan delta value Minimum withstand value of cantilever load on bushing 13. LV bushing make & type LV bushing rated current Rated thermal short time current LV bushing rated voltage LV bushing 1 minute power frequency withstand voltage LV bushing lightning impulse withstand voltage LV bushing minimum creepage distance in mm LV bushing maximum tan delta value Minimum withstand value of cantilever load on bushing 14. Transformer HV terminals suitable for connection to isolated phase bus duct 15. HV terminal clearance phase to phase HV terminal clearance phase to earth 16. LV terminal clearance phase to phase LV terminal clearance phase to earth 17. Maximum current density (Amp / sqmm) Transformer no load loss at rated voltage, frequency & at 75 C Transformer load loss at rated current, voltage, frequency & at 75 C Transformer stray 75 deg C Transformer auxiliary loss at rated load Total losses (max.) Efficiency at 100% rated load, 750C and 0.9 power factor Maximum efficiency Load & power factor at which it occurs 20. Marshalling box Enclosure ingress protection class Panel sheet thickness Weight of MB panel YES / NO WSUPL1-WEL-631-TSP-0100 R1 Page 23 of 29

24 21. Tank conventional type Thickness of steel plate used Tank design tested as per relevant IS / IEC / CBIP for Vacuum & Pressure test 22. Core material grade M4 or better Thickness of lamination Design flux density in the core at rated condition at principal tap Guaranteed No Load current at 100% rated voltage on HV & LV side 23. Type of Winding HV & LV side Conductor material Cu or Al Conductor cross section HV & LV side Insulating material Insulating material thickness HV Turn & LV Turn 24. Insulating oil as per specification YES / NO Quantity of oil in main tank Quantity of oil in conservator Total quantity of oil 10% excess oil furnished? YES / NO 25. Winding Current Transformer (WCT) Type & make Reference Standard CT Ratio Burden, VA Class of Accuracy 26. Pressure release device- PRV make Minimum pressure the device is set to rupture 27. Buchholz Relay make 28. Sudden Pressure Relay make 29. OTI make 30. WTI make 31. Magnetic Oil level Gauge make 32. Fittings Accessories as given in specification (Bidder shall attach WSUPL1-WEL-631-TSP-0100 R1 Page 24 of 29

25 separate sheet giving details, make and bill of materials) Painting for external surface shade & 33. thickness in micron Painting for internal surface shade & thickness in micron Transformer overall dimensions 34. Length x Width x Height Transformer MB/CCC panel dimensions Length x Width x Height 35. Transformer total weight Tank weight Core weight Winding weight Frame parts weight Total weight of oil Largest consignment transport weight All in process tests confirmed as per specification / quality plan? Performing all Type Tests as per specification included in offer? Performing all Routine Tests as per specification included in offer? All Special Tests confirmed as per specification? All documents submitted as per specification? Reference list of clients for supply of similar rating of transformer enclosed? Deviation sheet submitted with reference to specification clause? YES / NO YES / NO YES / NO YES / NO YES / NO YES / NO YES / NO NOTE :- 1) Bidder to fill up only column (B) and shall not change description in column (A) 2) Bidder to submit GTP with data in numerical values wherever asked. 3) Bidder shall not use words like Adequate, As per standard, Later, After award etc. This will be considered as deviation. Stamp / seal of bidder WSUPL1-WEL-631-TSP-0100 R1 Page 25 of 29

26 S. N. Item / Service ANNEXURE-B LIST OF SUB-VENDORS Proposed Sub-suppliers Place of Manufacturing Works 1. Copper 3. CTC 4. CRGO 5. TANK -CONSERVATOR 6. RADIATOR 7. VALVES 8. WTI-OTI 9. GAS OPERATED RELAY 10. PRESSURE GUAGE 14. BUSHING 15. CONTROL PANEL 16 FLEXIBLE CONNECTORS 17 PERMALI BOARD 18 PRESS BOARD 20 OIL LEVEL GUAGE 21 PRV 23 CT 24 RTD 25 AIR CELL 26 BUKHOLTZ RELAY 27 RUBBER-CORK GASKET 28 INSULATOR WSUPL1-WEL-631-TSP-0100 R1 Page 26 of 29

27 ANNEXURE-C TECHNICAL DEVIATIONS FROM THE SPECIFICATION (This shall form part of technical bid) All the technical deviations from the tender specification shall be listed out by the Bidder para by para in this schedule. Deviations taken in covering letter, standard terms and/or body of the Bid but not listed herein will make the Bid liable for rejection as 'Irresponsive' S.No. Section/Sub Section Part Para Deviation Justification Certified that above are the only technical deviations from the tender Specification. Name of Firm : Signature of Bidder : Seal of Company Name of Bidder : Designation : Date : WSUPL1-WEL-631-TSP-0100 R1 Page 27 of 29

28 ANNEXURE-D PRICE SCHEDULE 1. Bidder's Complete Company Name : 2. Bidder's Proposal Number : 3. Bidder's Proposal Date : 4. Bidder's Proposal Validity Period : 5. Bidder's quoted price for the : Supply of equipment as specified, properly packed for transportation f.o.r. manufac-turer's works (Prices to be inclusive of all taxes and duties but exclusive of transit insurance, spare parts, tools and charges for tests if any. Taxes shall be indicated separately). a. Transformers with : Rs.... first filling oil & accessories as specified b 10% extra oil in nonreturnable container : Total (a + b) : 6. Bidder's total Charge for :- Rs.... Rs.... a. Transportation of equipment as specified f.o.r. site : b. Transit Insurance including storage at site : 7. Bidder's Charges for the Tests Specified : 8. Bidder's Total Price f.o.r. site (Items ) : 9. Bidder's charge for supply of special tools & tackle f.o.r. site (inclusive of all taxes, duties & transit insurance) : WSUPL1-WEL-631-TSP-0100 R1 Page 28 of 29

29 10. Bidder's charge for supply of spare parts at site(inclusive of all taxes, duties & transit insurance) 11. Bidder's Engineer's per diem charge for supervision of erection, testing and commissioning : 12. Foreign Exchange requirement c.i.f. in equivalent rupees included in the quoted prices :- a. Total Price (Item - 8) : b. Spare parts (Item - 10) : 13. Import License :- a. To be provided by Owner? : b. Covered in Bidder's Own Quota? : 14. Prevailing rates on which quoted f.o.r. price is based :- a. Ocean freight and Marine Insurance for imported items : b. Customs duty for imported items : c. Exchange Rate : d. Indian Agent's commission : e. Excise Duty : f. Sales Tax : g. Octroi Duty : h. Any other leviable taxes : 15. Are the quoted price :- a. Firm? : b. If not, state i) What is the ceiling? : ii) Price variation formula with prevailing rates of labour and materials (add more sheets, if required) : c. Inclusive of any rebate? : 16. Is the Deviation Sheet filled up? : 17. Prices of Items (if any) not included in the above quoted price : WSUPL1-WEL-631-TSP-0100 R1 Page 29 of 29

30 FIGURE-1 HV LV1 LV2 LV3 LV4 SCHEMATIC CONNECTION PHILOSOPHY SCHEMATIC CONNECTION PHILOSOPHY 4.5MVA 5WDG INVERTER TRANSFORMER 5MW JSNNM SOLAR PLANT