80/MID/AN

Repairs to 100 KVA LT Transformer 6.6 KV/440 volt of LIS Rajal byway of disconnecting the damaged ECE make 100 KVA capacityoil natural air natural cooling,Vector group Dy 11, no load voltage (HV-11-6.6KV & LV-400V),frequency 50 HZ, from main power supply 6.6 KV HT line and also disconnecting /detaching /removing 3.5 core cable connected to LT bush rods after switching off the main breaker as well as of auxiliary breaker and dragging them out.The job includes opening of top cover after unbolting the nut bolts of the top cover then extraction of transformer assembly out of the housing with the help of chain pulley block after fitting the chain pulley block with the Tripod stand on the damaged transformer. Placing the damaged core assembly on the ground by lowering the chain ,also detaching/removing HT bush rod assembly ,LT bush rod assembly and keeping them on the groundComplete dismantling of transformer assembly & allied parts and draining out of old oil approx. 220 ltr. into barrel. Providing & fitting of new coils made out of EC grade copper with insulation HT coils 8 Nos, reconditioning of LT coils 3 N0s, providing and fitting of HT insulated bush assembly one number ,providing and fitting of LT insulated bush assembly one number , providing & fitting of packing sheet/gasket, . Cleaning of transformer tank from in- side to make it free from slag, dirt, and other unwanted deposits/ suspensionsthen making connections of coils on HV & LV side as well. Assembling and lowering core coil assembly in the tank, providing & filling of fresh transformer oil 320 litres up to the required level in the transformer then IR value is checked ,the complete job includes making of electric connections on HV Side & LV side by way of cleaning with the help of emery paper to make the connections free from corrosion etc at site, providing and fitting of new nuts, bolts and washers. Making of earth connections after testing of earth resistance value. Field testing of transformer for all connected functional parameters on no load as well on load conditions, checking for noise/humming,the complete job including the cost of material, hire charges of machinery/tripodstand, tools& tackles and labour charges for skilled &semi skilled workers etc with transportation charges for carriages of material & transformer oil also head load charges.

BEE AAR ENTERPRISES

NATIONAL ELECTRO-MECH COMPANY