works at substations

Complete drain out of T/F oil from the existing 63MVA T/F Main tank, consevator and radiator by filling into empty oil drums/oil tanker and stacking at proper place.

Complete Dismantling of 63 MVA T/F accessories including Radiator,HV/LV/Neutral Bushing, Turrets, Buchholz relay, colling fans ,oil pipe line from conservator tank to main tank, oil pipe line to OLTC and Surge Relay conservator tank etc. along with opening of associated electrical connections, stacking of all dismantled parts at proper place in switchyard including proper blanking of the open points before replacement of Gaskets.

Complete Replacement of all the gaskets of 63 MVA T/F including removal of old/damaged Gasket by providing new gasket as per required size of good quality rubberized cork sheet of Kotika/Turboze/Nu cork brand grade 07. make at required place of complete T/F including top cover i.e. HV &LV bushing, HV & LV turret , OSR , PRV , Buchholz relay , drain valve , conservator tank , Radiator pipe , Mog & other all accessories.

Complete, erection of 63 MVA T/F by erection of radiator, conservator tank,Buchholz relay,PRV , oil pipe line, cooling fans , bushing with its turrets, HV/LV/Neutral bushings , all pipelines,radiator, etc. including replacement of defective nuts & bolts (top cover) radiator valve ( butterfly valve) and all other associates work for complete of work.

Cleaning of Transformer Core and winding by hot T/F oil and removed the slug from bottom.

Creating the Vacuum inside the main tank for period for 12 Hrs. and filling of centrifuging oil step by step up to core & winding ,conservator tank ,radiator.

Centrifuging of complete T/F oil ( 24000 Ltr. Approx ) by connecting centrifuging pipes, circulating the T/F oil through centrifuging machine (to be provided by the contractor at his own cost) to increase BDV . Centrifuging of oil in T/F and taking the IR, BDV and PPM value of the period of 04 hrs as per norms of transformer manufacturer till the desired value are attained, filling of centrifuging T/F oil up to required oil levels of T/F. and taking the BDV value of the periodically till the required value is achieved T/F oil.

Painting of 63 MVA T/F with suitable for gray paint.

Carriage of 20 KL Oil Tank from 220 KV Substation Morti to 220 KV Sub station Sahibabad including its loading on trailer and unloading at 220 KV S/S Sahibabad with in distance of 10 KM.

Sampling and testing of transformer , if required , oil at CPRI or any other NABL accredited testing lab including cost of transportation of each sample in standard sampling bottles (adequate no of bottles to be arranged by the contractor). Samples to be taken at required intervals ( as per actual requirement)- Following tests are to be conducted for each sample- 1.Breakdown voltage 2. Moisture Content