Supply, installation, testing andcommissioning of NGR 3.3 kV protection system in 33kV/3.3kV Power transformers and 3.3kV DG Set at 33kV S/s and NGR 440V protection system in 3.3kV/550V/440V power transformers at NCPH, RA and VW UG Mines of CHRM Ar

a) 3.3 kV NGR Monitoring i) Protection panel control unit with E/L EF relay box, supply voltage 110V/220V ii) Cabinet enclosure 14 SWG powder coated iii) Pedestal frame iv) Resin cast NCT 1/190 mm (3.3 kV grade or above) v) Reactor terminal assembly vi) Control knob gland plate vii) Potential Transformer viii) NGR Monitoring Fail Safe Relay-range (100 mA to 10 A in step of 100mA) ix) Fuse enclosure, HRC fuse, connectors, glands x) Control wires and bushing studs, buzzer(Electronic) xi) Powder coated control panel and resistance box with all accessories, Outdoor type xii) Power packunit2 nos. one for Fail Safe Relay & 2nd for NGR sensor b) 3.3 KV NGR resistance panel i) 3.3 kV NGR 190 ohms 10% punched type stainless steel non-megnetic Grid resister ii) Cabinet enclosure 14 SWG powder coated iii) Pedestal frame iv) Terminal and connection copper lead v) Gland and plate assembly SAFETY FEATURES FOR SET OF NGR with deployment as follows: 04 Nos. for NCPH SA i.e. (i) 01 No. 3150 kVA, 33KV/3.3KV , Power Transformer. (ii) 01 No. 1600 kVA, 33KV/3.3KV , Power Transformer. (iii) 01 No. 2000 kVA, 33KV/3.3KV , Power Transformers (To be installed) & (iv) 01 No. 1010 kVA, 3.3kV Diesel Generator Set., 02 Nos. for Rani Atari UG Mine i.e. (v) 01 No. 2000 kVA, 33KV/3.3KV , Power Transformer & (vi) 01 No. 1010 kVA, 3.3kV Diesel Generator Set, 01 No. for Vijay West UG Mine i.e. (vii) 01 No. 1600 kVA, 33KV/3.3KV , Power Transformer.

Providing & fixing of NGR 440/550 V protection at surface substation of NCPH Colliery R-6 Mine, NCPH Old Mine, CHP and Colony of NCPH Sub-Area & Rani Atari and Vijay UG Mines of Rani Atari SA. Supply and fixing of NGR & Sensitive Earth Fault Relay, SPP, Short circuit Relay etc. at secondary side of transformer: (22 Nos. NGRs for NCPH SA as mentioned below) : 01 No. : 63 kVA, 3.3kV/440V transformer, 33/3.3kV Substation NCPH Colliery R-6 Mine 01 No. : 315 kVA, 3.3kV/550V transformer, 3.3kV Substation NCPH Colliery R-6 Mine 01 No. : 250 kVA, 550V/440V transformer, 3.3kV Substation NCPH Colliery R-6 Mine 01 No.: 500 kVA, 3.3kV/550V transformer, 3.3kV Substation NCPH Colliery Old Mine 01 No.: 100 kVA, 3.3kV/440V transformer, 3.3kV Substation NCPH Colliery Old Min 01 No.: 630 kVA, 3.3kV/440V transformer, 3.3kV Substation NCPH CHP/Siding 01 No.: 200 kVA, 3.3kV/550V transformer, 3.3kV Substation NCPH CHP/Siding 01 No.: 75 kVA, 3.3kV/550V transformer, 3.3kV Substation NCPH CHP/Siding 14 Nos.: 3.3kV/550V transformer of different capacities, NCPH Colony, NCPH Sub-Area (02 Nos. NGRs for Rani Atari UG Mine as mentioned below) : 01 No.: 160 kVA, 3.3kV/440V transformer, 3.3kV Substation 01 No.: 200 kVA, 3.3kV/440V transformer, 3.3kV Substation (02 Nos. NGRs for Vijay West UG Mine as mentioned below) : 01 No.: 160 kVA, 3.3kV/433V transformer, 3.3kV Substation 01 No.: 500 kVA, 3.3kV/550V transformer, 3.3kV Substation

Earthing with G.I. earth pipe 4.5 metre long, 40 mm dia including accessories, and providing masonry enclosure with cover plate having locking arrangement and watering pipe etc. with charcoal/ coke and salt as required (For NCPH - 52 Nos. & For RASA - 20 Nos.)

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