REPAIR/MAINTENANCE TO EXTERNAL ELECTRICAL DISTRIBUTION SYSTEM INCLUDING HT/LT UG CABLE, LT PANEL AND DG SETS INCLUDING CONNECTED WORKS AT NMRL AMBERNATH

Dehydration and Filtrations of transformer oil of distribution/power transformer of different capacities through stream line filter unit to increase di -electric strength (BDV) of transformer oil not less then 40 KV for 1 minute at 2.5 mm gap including topping up transformer oil to the required level as indicated to each transformer and testing, transformer oil before and after filtration submission of records of test in duplicate all as directed by Engr-in-Charge .Note: Transformer oil for topping up will be measured and paid separately

Material and labour for dismantling the 22KV HT Supply and isolating the Distribution /power transformer of capacity 1250 KVA draining out the insulating oil from the tank for dehydration. Opening the top cover, removing the damaged gasket and replace the same size / thickness of new gasket of transformer, conservatory tank oil indicator, inlet & outlet valve gasket in position replacing the defective, burnt bushes with gaskets and brass studs if required re filling back drained transformer oil and ensuring no leakages of oil from any part of the transformers and then testing energizing complete.

Material and labour for dismantling the 22KV HT Supply and isolating the Distribution/power transformer of capacity 1000 KVA draining out the insulating oil from the tank for dehydration. Opening the top cover, removing the damaged gasket and replace the same size / thickness of new gasket of transformer, conservatory tank oil indicator, inlet & outlet valve gasket in position replacing the defective, burnt bushes with gaskets and brass studs if required re filling back drained transformer oil and ensuring no leakages of oil from any part of the transformers and then testing energizing complete. Note :- (a) Fresh transformer oil for topping up will be measured and paid separately. (b) Bushes and brass studs will be measured and paid separately.

Material and labour for dismantling the 22 KV HT Supply and isolating the distribution transformer of capacity 250/315 KVA draining out the insulating oil from the tank for dehydration. Removing the damaged gasket and replace the same size / thickness of new gasket of transformer, conservatory tank oil indicator, inlet outlet valve gasket in position replacing the defective, burnt bushes with gaskets and brass studs if required re filling back drained transformer oil and ensuring no leakages of oil from any part of the transformers and then testing energizing complete. Note :- (a) Fresh transformer oil for topping up will be measured and paid separately. (b) Bushes and brass studs will be measured and paid separately.

Supply and fix in repairs breather assembly of the transformer of following capacity, any shape, any dia suitable to fit for existing transformer assembly, complete all as specified and as directed. NOTE: Shape/type should be as per existing transformer at site. (a) Capacity of Transformers 100 KVA to 500 KVA

(b) Capacity of Transformers 1250/1000 KVA

Disconnecting and dismantling & complete overhauling of Transformer capacity 1000 to 1250 KVA, after disconnecting of electric supply and earth connections including transportation to work shop, opening the top of transformer, drained out transformer oil, lifting/removing of top cover of transformer & cores with chain pulley blocks/crane, cleaning of sludge and washed down with the help of spray of clean oil and re-assembling of transformer with S&F of new gasket set assembly, replacement of nuts, bolts and washers as required, re filling of Transformer oil after centrifuging at satisfactory dielectric strength complete after electric connections and testing all as specified and directed.

Material and labour for Rewinding of transformer Step up / down , HV Coils complete with existing size/ electrolytic copper conductor design with TPL covering, re-assembling of newly wounded coils on core in position including re- insulation, oven baking and testing complete all as specified & directed.

Material and labour for Rewinding of transformer Step up / down , LV Coils complete with existing size/ electrolytic copper conductor design with TPL covering, re-assembling of newly wounded coils on core in position including re- insulation, oven baking and testing complete all as specified & directed for the 50-1250KVA transformers .

Material and labour for Filling of new transformer oil confirming IS 335/93 topping of transformer through stream line filter shaving dielectric strength not less than 60 KV complete including centrifuging of oil (if required) up to getting dielectric strength near 60 KV all as specified and directed.