PERIODICAL MAINT IMPROVEMENT OF ELECTRICAL INSTALLATION SAFETY RELATED AND ALLIED WORKS AT NAVAL DOCKYARD VISAKHAPATNAM UNDER GE (I) DM VISAKHAPATNAM

M&L required for removal of old hardcore of any size, clearing the bushes from 132KV MRS yard and excavation not exc 2 feet , dressing, levelling and compaction of exising ground to required slope safely all around 132 KV feeder, HT capacitor structure & power transformer complete all as specified & directed. Note:- (a) Any damage caused to existing cables, earthing conductors, equipments or civil structure during execution shall be made good by the contractor at no extra cost. (b) Removal of excavated sand outside the dockyard area are in bidder scope. (b) The contractor shall ensure compliance with all applicabe safety regulations while working inside the 132 KV yard. (c) Technically qualified and experienced personnel shall be engaged for carrying out the work. (d) The contractor shall be engage his site engineer / experienced supr.

Supply and laying Non woven geotextile fabric sheet, 200-250 GSM all around HT capacitor structure & power transformer including 300mm overlap as per IS 16391 complete all as specified and directed.

M & L coarse sand layer, 75mm thick (dust free) including levelling and compacting complete all as specified and directed.

Supply and spreading machine-crushed stone gravel 40mm size approx to a compacted thickness of 150 mm with uniform finish all around HT capacitor structure & power transformer to provide high resistivity surface and rammed to a true surface and removal the excavated soil outside the yard premises complete all as specified & directed.

Taking out manually defective transformer of capacity 500-2000 KVA from its position upto road n. exc 50 mtr and transportation by vehicle to workshop not exc 25 KM and reinstallation at original position after repair including all cable/earth connections all as specified and directed. Note: a) Rates for dismantling of HT/LT cable & earthing and reconnection after installation deemed to be included in the quoted rate, (b) Necessary crane for lifting of transformer and vehicle for transportation shall be arranged by the contractor and deemed to be included in the quoted rate.

M & L for core & chamber cleaning by lifting up carefully transformer core after dismentling carefully terminal connections from core to HT/LT bushings, tap changer assy, drainout all oil and keeping in clean container, flushing with transformer oil for cleaning of core/winding, cleaning of transformer tank by removing all sludges, re-install core with tapchanger, all connection complete all as specified and directed for the transformer 250 to 2000 KVA, 11/0.415 KV transformer complete all as specified and directed. Note:- (a) Opening of top cover, nuts, bolts & washers, HT/LT busings, brash rods, de-hydration/topping up of oil as required, shall be mesured separately under appropriate item, (b) The work shall be carried out inside dockyard, (c) Transformer oil used for flushing shall be retained and re-used vide item No-1, (d) Empty transformer oil containers shall be arranged by the contractor and inclusive of quoted rate.

M & L for rewinding of HV/LV coil after lifting up carefully transformer core after dismentling carefully terminal connections from winding to tap changer assy and to HT/LT bushings, drainout all oil and keeping in clean container, dismentling core, dismentling all HT & LT coils from core for rewinding, testing and reassembling complete with HT/LT coils to core, required necessary numax paper insulation, insulating press board, precompressed board off sizes, vernishing, heating to achive insulation level not less than 1000 megaohms at both HT & LT side, core at transformer chamber, tap changer assy, terminal connection, refilling of oil complete for the transformer capacity 500 to 2000 KVA, 11/0.415 KV transformer complete all specified and directed. Note:- Opening of top cover, Rewinding of HT/LT coils, transformer oil, nuts, bolts & washers, HT/LT busings, required new mesured separately under appropriate item.

M&L for rewinding of HT coils suitable for 11000 volts grade with new DPC/super enamelled copper wire having Class-F insulation as per existing size and turns for capacity of transformer 250-2000 KVA complete all as specified and directed.

M&L for rewinding of LT coils suitable for 1100 volts grade with new DPC /super enamelled copper strip having Class-F insulation as per existing size and turns for capacity of transformer 250-2000 KVA complete all as specified and directed.

Supply only galvanised mild steel screw bolts (machine made) with hexagonal head at one end and screwed the other with washer and one hexagonal nut not exc 5 cm long and 11-15 mm dia of neck all as specified and directed.