REPAIR REWINDING MAINTENANCE OF DIFFERENT CAPACITIES OF TRANSFORMER AND CONNECTED HT ALLIED WORKS UNDER GE SAMBA

Labour charges only for inspection of defective step down 11 KV / 0.433 upto 400 KVA transformer any make and mounted on plinth/floor/ pole mounted, indoor/outdoor type, step opening, removing the top cover of transformer, detecting the fault, rectfying the defect at site (Samba, Dayalachak & Galak) except major fault of burnt winding or other. The following tasks if required will be performed :- (a) Step opening of the transformer and removing the transformer top cover for checking/rectified the faults of the transformer. (b) Replacement of defective HT/LT bushes, brass spindles etc. (c) Refixing the transformer top cover with OEM recommended size gasket of minimum thickness 5mm, nuts, bolts and washers if oil filing pipe cover damages replaced with suitable size of steel cover as per existing model and size the payment for gasket paid separately under relevant items of CA schedule. (d) After carrying out of repair work, testing of transformer magnetic balance test, HT/LT winding insulation test complete and produce testing certificate with the sign of contractor, Engineer-in-Charge, Technician deputed by contractor, the payment of any RAR/Bill shall not be released to the contractor without test certificate. Note : (i) In case of replacement of LV / HV bushing / spindles / tap changer etc, will be measured and paid for separately under relevant items. (ii) Transformer oil (if required) for topping will be measured and paid for separately under relevant item (iii) If the LT bushing spindle of copper strip/steel layer strip found damaged shall be replaced with new one. The payment for replacing the strip is included in the quoted rate. SM Nos of the transformers likely to be repaired shall be written on equipment all as directed by Engr-in-Charge/GE.

M&L for disconnecting, lifting, loading and transportation of unserviceable transformer indoor/outdoor type 11000/433 volts of capacity 50 KVA to 400 KVA from site to workshop for repair/rewinding and repair to the transformer by dismantling the top cover and removing unserviceable burnt LT/HT side coil from the core, rewinding the LT and HT side core complete with same size of copper wire in HT side and copper strip from LT side with suitable insulating materials, nuts, bolts, washers, gasket set etc, heating the new transformer winding in special heat chamber for demoisturising of LT/HT coil, connecting the LT/HT coils, filling the fresh transformer oil, reassembling the transformer, transporting/shifting back the transformer at site after repairs, recommissioning & testing, including applying two coats of synthetic enamel paint of approved paint after preparation of all external surfaces of transformer, complete, all as specified and directed by Engineer-in-Charge. Note:- (i) The quoted rates shall deemed to include for the transportation, T&P, Labours from site i.e Samba inside Military Area, Dayalachak & Galak to workshop and workshop to back at site after repairs, cost of gasket set, nuts, bolts, washers, etc. (ii) All other spares such as tap changer, copper wire & copper strip for rewinding, HT/LT side bushing, transformer oil & air breather assembly with silica gel shall be measured and paid for separately as "Supply only" under respective items of this Schedule.

Supply only HT bushing, 12000 volts, 50 Hz porcelain with copper stud, nuts, bolts, washers, gasket, oil seal suitable for transformer 11/0.433 KV, 250 to 400 KVA capacity complete all as specified and directed.

Supply only HT bushing, 12000 volts, 50 Hz porcelain with copper stud, nuts, bolts, washers, gasket, oil seal suitable for transformer 11/0.433 KV, 50 to 200 KVA capacity complete all as specified and directed.

Supply only LT bushing, 1100 volts, 50 Hz porcelain with copper stud, nuts, bolts, washers, gasket, oil seal suitable for transformer 11/0.433 KV, 250 to 400 KVA capacity complete all as specified and directed.

Supply only LT bushing, 1100 volts, 50 Hz porcelain with copper stud, nuts, bolts, washers, gasket, oil seal suitable for transformer 11/0.433 KV, 50 to 200 KVA capacity complete all as specified and directed.

Supply only breather assembly including it contains silica gel (deep sky blue) for the various size of transformer 50 KVA to 400 KVA complete all as specified and as directed.

Supply and filling in replacement of silica gel (Deep sky blue) in to existing breather assembly of transformer ( to fill silica gel in Distribution Transformer and Power Transformer 02 Nos 5 MVA Capacity) complete all as specified and as directed.

Supply only gasket sets of minimum thickness as per OEM recommended or existing thickness for transformer tank 50 KVA to 400 KVA capacity with nuts, bolts etc complete all as directed. Note: While dehydration of transformer existing transormer oil should be collected in clean drum after that replace the defective gaskets after placing gaskets re-fill the oil through de-hydration machine including topping up oil if required. The dehydration and topping up of oil measured as relevent item of schedule.

Material and labour for rewinding of Transformer of capacity 50 KVA to 400 KVA for HT winding the defective coils with approved quality of copper wire as per IS specification of existing guage and with new insulation materials, varnishing by vaccum impregnation and baking of coil assembly to match with the existing original winding coils bracings the terminals before placing into the transformer and assembling the HT coil with new insulation between core all as required and fitting the coils in the chamber, testing and commissioning the transformer after providing necessary connections complete including transportation to workshop and back to site, lowering the transformer from two pole structure and after repair locate the transformer in two pole structure included in the quoted rate.