DEHYDRATION SERVICING PERIODICAL TESTING AND MAINTENANCE OF 11 433V TRANSFORMERS INSTALLED AT VARIOUS SUBSTATIONS AND ALLIED WORKS AT NAVAL DOCKYARD VISAKHAPATNAM UNDER GE (I) DM VISAKHAPATNAM

M&L for opening of top cover in situ or at wksp by unscrewing all nuts, bolts & washers, daining out transformer oil upto required level and keeping in clean container for repair/replacement of HT/LT bushings, tap changer, physical check of any defects, for lifting of core assy, for cleanning/repair and refixing top cover complete with RC 70 C rubberised cork sheet gusket sheet , existing/new nuts, bolts & washers for transformer indoor/outdoor type, refilling of oil for transformer capacity 250 KVA to 750 KVA all as specified and directed. Note:- (a) HT/LT bushings, Studs, tap changers, nuts, bolts & washers required new shall be mesured separately here-in-after (b) RC 70C rubberized cork sheet shall be inclusive of quoted rated.

All as per item No. 1.00 above, but for transformer capacity 1000 KVA to 1600 KVA, 11/0.415 KV Note for serial item No 1 to 2 :- (a) New transformer oil to be bought in company sealed ISI marked container with test certificate (b) Filtration /dehydration of transformer oil shall be carried out at the location where transformer is installed and required pipe connection from filter machine to transformer shall be made and rate shall be inclusive of quoted rate. (c) Necessary filter/dehydration plant having pressure gauge, hour meter, temperaturature gauge to be brought at site by contractor and to be kept permanently inside ND (V) till completion of work and rate deemed to be included in the quoted rate. In any condition, in-out of the filter machine during the progress of the work will not be allowed. (d) Transformer oil test report before and after dehydration/filtration shall be submitted duly authenticated by state Govt CEIG, Directorate of Electrical safety Licence for testing of Di-electric strength of Transformer oil and issue of test certificate.

M&L for dismantling of HT/LT porcelain insulator after dismantling cables at outside & transformer terminal at inside of transformer for rectification of oil leakage through insulator or for replacement of insulator or for replacement of brass stud by taking out unsv gusket from inside & outside bushing and replacement with RC 70 C rubberised cork sheet gusket of proper thickness, reassemble old/new insulator, brass stud, HT/LT cable connection, HT/LT transformer inside terminal connection to original position all as specified and directed. Note: (a) Opening of top cover measured separately (b) porcelain insulator HT/LT & Brush stud with nuts & bolts required new shall be measured as supply only. (c) Silicon sheet gusket shall be inclusive of quoted rate.

Supply only transformer porcelain bushing outdoor/indoor type suitable for 11 KV grade complete of transformer capacity 250KVA to 3000 KVA, 11/0.415 KV transformer complete all as specified and directed. (Transformer bushings shall be compitable model with make and model of existing transformer)

M & L for filtration/dehydration transformer oil of transformer voltage grade 11/0.415 KV, capacity 250 KVA to 3000 KVA indoor/outdoor type, floor mounted in situ till achieve dielectric strength minimum 40 KV at 4mm gap all as specified and directed.

M & L for topping up/replacement of transformer oil with new transformer oil suitable for working voltage 11000 volts grade including necessary dehydration to achieve dielectric strength min 40 KV at 4mm gap complete all as specified and directed.

Periodical servicing of complete transformer at every alternate 3 month by cleaning of complete outside surface, observing any oil leakage from any point, rectify by replacing with suitable RC 70 C rubberised cork sheet gusket to keep the complete outside surface dry all as specified and directed. Note- (i) replacement of silicon gusket other than at top cover and bushings shall be carried out and rate shall be inclusive of quoted rate. (ii) rectification of leakage from top cover and from bushing shall be measured and paid separately in the schedule (iii) Works under warantee period will not be measured in repitation

M&L for complete painting of transformer outer surface in situ/wksp with one coat of synthetic enamel paint using sprayer for transformer capacity 250-1600 KVA after prliminary preparation of old painted surface . Note : (i) During process of painting, transformer will be under shut down for the period and the rate deemed to be included for running the sprayer machine with alternative arrangement by contractor. (ii) After completion of painting HT/LT outdoor bushing, cable termination joint, Oil inspection glass, meters and name plates to be made clean using volatile cleanner

M&L for testing of transformer 250 KVA to 1600 KVA, 11/0.415 KV at various location by following test for HV & LV complete (a) Insulation Registance (b) Winding resistance (c) Turn ratio (d) Magnetic balance, (e) Oil BD value Note: Required testing equipment for transformer test shall be brought by the contractor and rate shall be inclusive of quoted rate

M&L for replacement of new silica gel blue granives in place of light pink colour in the breather assembly of transfromer complete all as specified and directed.