Preventive Maintenance of Transformer HT Panel and Other Allied Works at DZC at CSIR NEERI

Preventive maintenance of the Transformer conforming to IS 10028 (Part-3). . . (i) Filtration of the transformer oil of a 500 KVA having 1010 Litres of oil. . . (ii) Regulator Unit having 300 litres of oil. By transformer oil filter machine, including the cost of transportation of the filter machine & oil tasting machine to the site. (Testing of oil conforming to IS: 1866) Die-electric Strength maintains up to 60 KV, and should withstand at 40 KV for one minute as required. Note: While filtration of the oil, L.T. three-phase supply and its wiring has to be arranged by the contractor at its own cost, using a DG set or another authorised method.

Replacement of gaskets of radiators joint (3/4 Nos), all L.T. Bushing joints, H.T. Bushing joints of 500 KVA Transformer. Draining out the complete oil up to the L.T. Bushing/ radiator level of the Transformer into drums. Dismantling of L.T. Connections, L.T. Bushing of the transformer. Changing of gaskets, oil seals. Retightening of L.T./H.T. Connections and Bushing of the Transformer. Then, refilling the oil into the Transformer (During the shutdown period) as required. . NOTE: 1. Filtration to be done before Commissioning of Transformer. 2. Empty Drums / barrels for draining of oil from the transformer shall be provided by the contractor at the site only at its own cost. 3.The contractor should arrange/coordinate the shutdown of the H.T. supply from the Electricity Board/ Company whenever required.

Replacement of Silica Gel Breather of Purity: UV-stabilized Polycarbonate with Aluminum end caps, Grade Full Aluminum, Powder-Coated, IP54 (IP65 with optional sealing kit) Operating Temp: -20 DegreeC to +90 DegreeC as required. Make in India product. Old breather to be handed over to the department.

Spray Painting of Regulator Unit of 94 KVA, 415 Volts by Synthetic Enamel Paint (AD grey colour) after its necessary external cleaning including the cost of Primer as required.

Supply and filling of Transformer oil for topping up of the transformer oil confirming to IS:335 having Die-electric Strength up to 60 KV, and should withstand at 40 KV for one minute (Testing of oil conforming to IS: 1866) as required.

Supply and fixing of Danger notice Plate. (11000 V) conforming to IS specification at 11 KV sub-station as required.

Servicing of L.T. Air Circuit Breker 800 Amp, including dismantling & cleaning of arcing chutes, arcing contacts, isolated contact, all fixed & moving contacts, auxiliary contacts cleaning, lubrication the tripping & closing mechanism & also free movement of guide channels. The work should be carried out by authorised sevice provider of ACB. (The work to be during at shut down period)

Checking & Calibration of Various Types of Safety Relay, installed in H. T. Panel with Secondary injunction test set including checking and coordination of relay settings as required. a) IDMT Relay Type: MRI-1-I5-B5-HRD, Make: CSPC b) Aux. Relay Type: B33X3, Make: E.R

Servicing of 11 KV H.T. VCB including cleaning, checking, Oiling, greasing of the mechanical system & also including checking of Insulating Resistance Value with H.T. Megger. Replacement of VCB Door Gasket (U Type), providing earthing to its door from the nearest earth point (The work to be during at shut down period)