Military Engineer Services Tender

Supplying, installing, connecting, testing & commissioning mineral oil immersed, natural air-cooled, outdoor type, double wound (copper) distribution transformer, three phase, 250 kVA rating, non sealed type, 50 Hz rated frequency, 11 KV high voltage and 415 V low voltage nominal system voltage, 11000 V/ 433-250 V no-load voltage ratio, connection (vector) symbol Dyn11, 30⁰ positive phase displacement, off circuit tap changing arrangement for voltage variations of +5% to -10% in steps of 2.5% for variation of HV, minimum energy efficiency level-2, 4.5% impedance, ONAN type cooling all as per IS-1180 (Part 1) : 2014 including amendment upto and including amendment No. 4 dated 01 Oct 2021 complete with all fittings, accessories and item complete all as specified and directed. Note : The energy efficiency level higher than the minimum energy efficiency level as specified here shall be provided without any extra cost in case the transformer of minimum energy efficiency level is not available.

M&L for GI Earthing complete with GI earth plate electrode 60cm x 60cm x 6 mm buried directly in ground verticvally to size of earth pit not less than 0.90x 0.90 x 2.25 mtr below ground level with top edge of the plate at a depth not less than 1.5 mtr below ground level, earth plate connected to galvanised earth strip of size 32 x 6 mm, 7.5 mtr long (Min) by means of brazing nuts, bolts, check nuts & washers, testing of completion (drawn in earth strip protection pipe light gade GI of size 40 mm dia) by means brazing at both edges with vertical plane of electrode all as shown in plate No 3 of SSR Part-I filling with charcoal dust and common salt, including necessary excavation and earth work in any type of soil ,perforated watering pipeof size 15 mm dia, funnel with wire mesh, earth strip protection pipe light grade PCC chamber (1:3:6) type C1 (for even finish on both the faces) and RCC cover (1:2:4) Type B1,450 x450 x50 mm thick with 6 mm dia CTD bars 150 mm c/c with 2 Nos of handles of 10 mm dia steel rod all as specified and directed and testing on completion and connected to equipment with lugs and screw nuts etc all as specified and directed by EIC Note : (i) 7.5 RM GI earth wire deemed to be included in quoted rates beyond 7.5 RM wire shall be measured and paid separately. (ii) Earth resistance of earth pit should be not more than 02 Ohms on testing after completion if the desired earth resistance is not obtained the earthing will be redone at no extra cost. (iii) Rate quoted by the tenderer is deemed to included salt & Charcoal upto & above 450 mm (Min) top of GI Plate.

S&F GI earth strip (32x6) mm strip with and including necessary clamps, nut bolts laid in ground complete all as specified and directed.