REPAIR AND MAINT OF TRANSFORMER VACCUM CIRCUIT BREAKER SERVO VOLTAGE STABILIZER AND OTHER HT PANEL CT/PT AND HT CABLE HT JOINT AND OTHER MISC CONNECTED WORKT AT BHDC UNDER GE (EAST) DELHI CANTT-10

M&L for comprehensive servicing, overhauling, testing, and preventative maintenance of Compact Substations (CSS) / Packaged Substations of capacities 200 KVA or 315 KVA of any make at various locations: The work shall involve safely isolating, shutting down, and discharging the entire high-voltage and low-voltage network under a valid permit-to-work, followed by a thorough internal and external cleaning of all three compartmentalized sections (HT, Transformer, and LT) to eliminate dust, carbon soot, and moisture using specialized electrical contact cleaners and lint-free wipes. including servicing and checking the mechanical/electrical operational alignment of the HT Ring Main Unit (RMU) or Load Break Switch (LBS), inspecting vacuum interrupters or SF6 gas pressures, and checking the structural alignment and lubrication of all operating drive mechanisms with synthetic lubricants. For the transformer compartment, the work includes checking the core-coil assembly, inspecting bushing seals for oil leakage, tightening all electrical terminations, checking off-circuit tap changer operations, inspecting breather silica gel condition, cleaning the radiator fins, and conducting mandatory winding insulation resistance (IR) and magnetic balance testing. For the LT compartment, the work entails overhauling and servicing the Air Circuit Breakers (ACB) or Molded Case Circuit Breakers (MCCB), checking main contact alignments, testing protection relays, shunt trips, auxiliary controls, checking bus bar joints for hotspots, and verifying the proper functioning of exhaust fans, space heaters, and door interlocks. Finally, the contractor shall replace all worn-out neoprene/EPDM enclosure gaskets, seal all cable entry glands, and apply specialized sealants to ensure the entire CSS structure is completely weatherproof, dust-proof, and vermin-proof complete in all aspect all as specified and as directed. Note: The dehydration/filtration of the transformer core insulation oil and oil top-up, if required based on the breakdown voltage (BDV) test results, shall not be covered under this scope and shall be measured and paid for separately under the respective item of the schedule.

M&L for Safe and professional disconnection of indoor or outdoor oil-cooled/dry-type transformers, ranging in capacity from 200kVA to 1000kVA, involving the systematic electrical isolation and physical disconnection of all High Tension (HT) and Low Tension (LT) terminal connections, cable terminations, and earthing strips including mechanical dismantling of mounting bolts and accessories, followed by the technical maneuvering, lowering from plinths, or shifting the unit out of the substation premises using specialized heavy-duty rollers, jacks, or crane arrangements as site conditions dictate, ensuring total protection against bushing damage or oil spillage during transit to the repair bay for major or minor overhauling, including all labor, T&P, and safety clearances as per site engineer’s direction.

M&L for the controlled draining of insulating transformer oil from units with a capacity up to 1000 kVA to facilitate minor onsite repairs; the scope includes the provision of leak-proof, chemically cleaned, and moisture-free storage containers by the contractor to ensure the oil remains uncontaminated and fit for reuse, along with the safe handling, temporary storage, and protection of the oil against environmental ingress, followed by the complete refilling of the unit post-repair, ensuring proper oil levels and air bleeding as per standard maintenance procedures and site engineer's instructions

M&L for the end-to-end transportation of unserviceable transformers with capacities up to 1000 kVA, including the professional loading and securing of the unit at the substation site, transit to the specialized repair workshop, and subsequent return transit to the original location following the completion of repairs including all logistical arrangements, including the deployment of suitable trucks or trailers, cranes for loading/unloading, specialized jacks and rollers for maneuvering through restricted substation layouts, and the precise re-installation and alignment of the transformer onto its original plinth or foundation, with the quoted rate being fully inclusive of all transportation costs, manpower, T&P, and necessary safety insurances as per site requirements and engineer's directions

M&L for Servicing / Repair of Transformer capacity upto 1000 KVA as follows :- (i) Fixing only HT procelain bushing with studs, nuts, washers 3 Nos. and LT procelain bushing with studs, nuts, and washers 4 Nos. and connection with primary and secondary windings and reconnecting with the main terminals as required and directed. (ii) Fixing only breather assembly, conservator, oil temperature gauge after proper cleaning, minor repairs etc. as required and directed. (iii) Replacement of all unserviceable gasket from top cover, HT/LT bushing with new one by using rubberised gasket sheet 4.0mm/6.0mm thick duly pasted with suitable adhesive . (iv) Replacement of unserviceable bolts with new one and fixing of existing serviceable bolts, nuts, washers of different sizes and tightening properly.Note HT/LT copper Coil measure seperatly.

Supply only of winding coils manufactured from high-grade, electrolytic-grade super enameled copper wire of premium quality, designed and wound to strictly match the existing gauge, physical dimensions, turns ratio, and impedance parameters of the transformer including premium interlayer insulation, vacuum drying, varnish impregnation, and standard factory testing to ensure full compatibility and resistance to short-circuit stresses complete in all aspect all as specified and as directed.

M&L for ON load Centrifuging and dehydration including filteration and cleaning of transformer oil by dehydration machine of 33 KV /11KV and 11/0.433 KV transformer at site and topping up deficient transformer oil including testing of samples before and after dehydration and filteration complete all as specified and directed. Note :- Deficient quantity of Transformer oil required for top up shall be measured and paid separately under relevant items of this Schedule here-in-after as supply only.

Supply only transformer oil of approved quality as per IS having dielectric strength of 45-60 KV in 2.5mm gap for filling in transformer or for topping up as required and directed

S&F of (at site/workshop), Porcelain Transformer bushing on LT (440 Volt) side, including brass stems conical bush and gasket after disconnecting electrically and mechanically for indoor/outdoor transformer of capacity upto 250 KVA and re-connecting electrically and mechanically, testing complete all as specified and directed. Note.The rates quoted is deemed to be included the cost of necessary labour charges for draining out & re-filling transforer oil, opening of top cover by unscrewing nut, bolts washers and suitable size pad type bus bar almuminium and nut bolt washers etc.

All as per Serial item No 09 here-in-before but capacity 315 KVA to 630 KVA