Repair and Maintenance of 33/0.4KV, 750 KVA Transformer

Amount

Cat (A) -Items to be supply and replacement The bidder is requested to quote their rates of following materials required for repair of the transformer with the following specification: Make: Crompton Greaves Ltd. Bombay, Transformer Standard – 2026-1997, KVA-750, No load Volts: HV-33000V, LV-433V, AMPS: HV-13.1A, LV-1000A, Diagram No.T223V7524D, Maker’s Sl. No.V7524, Type of Cooling-ONAN, Frequency-50Hz, Impedance Volt-5.39%, Connection Symbols-Dyn11, Core & Winding-1380Kg, Weight of Oil – 1160Kg, Total Weight – 3300Kg. Oil in Ltr.- 1330ltr. Year of Mfg. – 1990, Insulation Levels- L1 170 AC70/L1-AC3.

Supply and Replace the insulation of HV winding copper conductor with existing conductor.

Supply and Replace of insulation of LV winding strip copper conductor with existing conductor

Supply and rewind/replace the defective HV winding with New HV copper conductor

Supply and rewind/replace the defective LV winding with New LV copper conductor

Supply and to provide the Insulation of new HV winding copper conductor

Supply and to provide the Insulation of new LV winding copper conductor

Supply and to provide New insulting press board to be required for the windings.

Supply and Replacement of new EHV Grade transformer oil

Filtration charges for new EHV grade transformer oil

Supply and Replacement of new gaskets of RC 70 grade for all joints of the entire transformer.

Cleaning & spray painting of tank, radiators, conservator , tap changer, marshalling box etc. with one coat of primer & two coats of approved paint and inside the tank with epoxy paint.

Supply, Replacement of 36 KV 250 Amp HV Bushing with all modification works if required like cutting, welding or any other works etc.

Supply, Replacement of 36 KV 250 Amp HV Stud with all modification works if required like cutting, welding or any other works etc.

Supply, Replacement of LV EPOXY CAST Bushing with Metal parts. Rating 1KV/1000Amps. with all modification works if required like cutting, welding or any other works etc.

Supply and replacement of Buchholz relay

Supply and replacement of Breather with Silica gel.

Supply and replacement of explosion vent viewing glass and diaphragm

Following tests are to be carried out by the repairer in presence of IOP representative after complete rectification of the transformer problem and before dispatch of the transformer from factory/workshop/repair site: i) Measurement of winding resistance ii) Ratio, Polarity & Phase relationship iii) Load loss (Full load & No loss) iv) Impedance voltage (Shut circuit) v) All category of insulation resistance vi) Induced over voltage withstand (DBDF) vii) Separate source voltage withstand (High Voltage) viii) Transformer oil BD value ix) Temperature rise Two representatives of IOP will visit the repair site for inspection in two stages and their local hospitality is in bidder’s scope.

Labour, Tanking, Testing & Supervision charge

Transformer radiator welding(at one point)

Dismantling of Transformer with transportation from IOP, Bhubaneswar to repair site. The scope of job involves the following: 1. Disconnection of LV (4x3 ½ core x 400Sqmm PVCA) cables and HV (01x03 core x 300Sqmm 33KV XLPE) cable. 2. If any cable terminal sockets or cable glands needs to be cut, same is to be provided and redone during reinstallation of transformer after repair. 3. Removal of neutral & Body earthing. 4. Removal/opening of foundation fixing accessories to make free the transformer for movement. 5. Dismantling of transformer parts (if required) to facilitate for easy transportation. 6. Sliding/Moving of the transformer from transformer foundation to outside the periphery for easy lifting and loading on the transport vehicle. 7. Mobile Cranes required for lifting and loading the transformer is to be arranged by the bidder. 8. Transport vehicle is to be arranged by the bidder for transport the transformer from IOP to repair site and the transformer has to be transported on bidder’s responsibility.

Erection of Transformer with transportation from repair site to IOP, Bhubaneswar, The scope of job involves the following: 1. Reconnection of LV (4x3 ½ core x 400Sqmm PVCA) cables and HV (01x03 core x 300Sqmm 33KV XLPE) cable. 2. If any cable terminal sockets or cable glands were cut, same is to be provided and redone during reinstallation of transformer after repair. 3. 33KV HV Insulation- Booting is to be provided on the HV terminals during reconnection of HV cable. 4. Fixing of neutral & Body earthing. 5. Transformer parts (if any) dismantled to be re-assembled as per original structure. 6. Mobile Cranes required for lifting and placing the transformer on foundation is to be arranged by the bidder 7. Transport vehicle is to be arranged by the bidder for transport the transformer from repair site to IOP and the transformer has to be transported on bidder’s responsibility

Cat (B) - Buy Back Items

Buy-Back (ie minus)for the copper conductors of defective HV/LV winding going to be replaced.

Buy-Back (ie minus) for the transformer oil to be replaced during /after repair work

Buy-Back (ie minus) for major spares going to be replaced (if any) with details.