Annual Maintenance of Electrical Installation of Haringhata Farm, Nadia - Checking, Testing, Servicing and repairing of 3 Panel HT Gear with 2 nos. Transformer.

Amount

Visual inspection should be carried out of proper levelling of 750 KVA 11 KV/415V Cast Resin dry type Transformer base, proper grou- nding connections and retighting of at the connections per following procedure:- a) Loosen the upper horizontal tiebar Internal nut. b) Retight the upper arms vertical tie bar nuts. c) Retight the upper arms horizontal tie bar outer and inner nuts. d) Loosen the lower horizontal tie-barinner nuts. e) Retight the lower horizontal tie- bar inner & outer nuts. f) Retight the all others mechanical connections. g) Retight the all electrical connection, to prevent from overheating at the HV & LV terminals & connection points and the switching panels overheating of Transformer actuation of protective retay discharge between HV/LV & LV/ Earth and exclusive noise.

After visual inspection cleaning rectification of any defects of dry type Transformer the following Tests are required for safe operation. (incl. submitting - Test report.) a) Insulation resistance test between HV & LV winding and from ground. b) Testing the thermal protective device (i.e. check the connection of the circuit making sure that the voltage is in accordance and connected to their corresponding loops. c) Trams ratio test. d) Insulation PF testing. e) Winding resistance testing.

Clearing different type of impurities in the 750 KVA, 11 KV/415 V dry type transformer such as dry dust, wet dust, metallic dust, oils etc. with the help of vacuum cleaner, duster dry cloth benzene and ammonia or alcohol etc. which of them is required for better operation (Make ABB).

Dismantling the existing 630 Amps 12 KV VCB part by part very carefully avoid any damage (Sl. No. 7306113438/01/1/01/2,01/3

Thoroughly servicing and cleaning of 11 KV 630 Amp HTVCB with opening and retighting of all connection as per following procedure: - a) Cleaning of VCB with CRC 226 properly. b) Removal of load grease and regressing. c) Checking condition of SIG contacts. d) Checking condition and alignment of jaw contact. e) Checking and proper tighting of hard ware. f) Checking proper closing of all poles together. g) Checking of breaker tripping through push button. h) Checking & adjusting gap between hyleam sheet and side plate. i) Checking of the Auxiliary contacts continuity proper change over. j) Checking of all circlips. k) Checking IR value in both closed & open condition in between phase to phase and phase to earth.

Thoroughly servicing and cleaning the 11 KV CT of VCB by CRC &CTC oil and heating treatment properly to rise IR value and polished with high insulated Red Bectrol.

Servicing repairing the Relay of VCB and calibration incl. Testing the relay.

Opening the existing 11 KV / 110 V P.T. part by very carefully to avoid any damages and cleaning the same including servicing all the component and heating 3 Nos. male busing carefully and Testing IR value.

Testing the following equipment and submitting the test reports. a) CT & PT testing, winding checking IR value Testing polarity test winding resistances & ratio test. b) VCB panel operation & breaker trail operation contact resistance Test. c) Relay Testing. d) IR value & high pressure Test.

Servicing & testing of main LT 415 Volt ACB (Make: Schneider) & Distribution panel servicing by blower tightness checking of bus bar connection with cable and all contract etc. lapping by Petroleum jelly for all incoming and outgoing switches.

S & F of 415 V, 200 A, 3 pole MCCB breaking capacity 50 KA in place of damaged MCCB at LT panel (Schneider make Easy pact CVS 100 to 630 A overload setting (Ir) 0.7- 1 x In)

Transportation charges for tools & tackles, testing equipment from company workshop to site up & down

S & F of 240 V, 18 Watt recess mounted LED slim round light fittings complete with all accessories as per direction of EIC [Make: - Wipro/Philips/Crompton, Cat No. LCDEP-18-CDL]. NS

Electromech Engineers Co-Operative Society Ltd.

SINHA TRADING CORPORATION