MID/AN/137

Providing, Fixing of HT copper limbs, LT copper coil & filling of transformer oil alongwith testing and commissioning of APEX make 2.5 MVA capacity, three phase, 33KV/6.6KV, oil natural air natural cooling, Vector group Dyn 11, no load voltage (HV-33KV & LV-6.6 KV), current on HV side- 43.738 Amperes & 218.7 Amperes on LV side, Maximum temperature rise in oil 50ºC, frequency 50 HZ, Impedance Voltage 6.556% installed at electric Sub- Station of LIS Rajal by way of transportation including loading of 2.5 MVA capacity, HT Electric Transformer 33/6.6 kV at site (Rajal) with the help of suitable capacity hydra crane and trailer truck to manoeuvre and transport the same through road to workshop, unloading at workshop. After execution of job, again loading, despatch and unloading/stacking at required platform by means of suitable capacity Hydra Crane and trailer truck to reach back at site. The job includes opening of top cover, extraction of transformer assembly out of the housing, Complete dismantling of transformer assembly & allied parts. Providing & fitting of new HT copper limbs made out of EC grade copper with insulation -3 Nos. (i.e. 228 Kg/limb), and LT copper coils -03 No. (i.e. 180 Kg/coil), assembling & making of connections by new EC grade copper pre-heated coils on HV & LV side as well. Assembling of core, core- coil assembly. Providing and in laying in position of tapping connections by way of brazing with silver brazing rods including properly insulated tap leads dressed with insulation paper. Baking of re-wound transformer assembly in heating chamber till Specified/ proper IR value is achieved. Cleaning of transformer tank from outside & inside as well to make it free from sludge, dirt, and other unwanted deposits/ suspensions. Inside painting of transformer tank with hot oil resistant paint. Boxing up of Transformer with re-wound transformer assembly and complete connected accessories by providing and fitting of new HT& LT bushings assembly (01 No. each.), HT terminal plate, gaskets, fasteners, and connected sundries. Outside painting of transformer tank with two coats of red oxide followed by two coats of synthetic enamel after proper surface preparation. Providing & fitting of new breather assembly including silica gel and oil drain valve. Filling of new T.oil in transformer (220 ltrs) with the required BDV value and Di- electric strength up to specified mark inside conservator. Shop testing of transformer for permissible magnitudes of all connected parameters. Complete job includes cost of material after deduction of rebate on account of old material, labour charges for skilled & semi skilled labour, hire charges of machinery/tools & tackles with to & fro transportation charges etc, testing and commissioning at site including making of electric connections on HV Side & LV side by way of cleaning of bus-bars. providing and fitting of new thimbles, nuts, bolts and washers with 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 Job includes checking/replacement Buchholz relay to ensure tripping and safety of the Transformer at the time of occurrence of any fault. The job further includes necessary earthing of the transformer unit no. II. The job further includes tightening of HT/LT cables, fuses, connection, straightening of poles structure, wherever required, cleaning of surrounding etc.

PERFECT ELECTRICAL WORKS

JAI BABA LAL ENTERPRISES

M D Enterprises