SPL REPAIRS TO UG CABLE AND TRANSFORMER OF BARAK AND URAN WORKSHOPS AT NAD UNDER GE U-I VISAKHAPATNAM

Amount

Supplying, Installing, Connecting, Commissioning and Testing of Transformer, Step Down, Outdoor Type, EEL2 Plinth Mounted complete with standard fittings, 11 KV / 433 V [at No load], AC, 3 Phase, 50 Hz, of 750 KVA capacity, Double Copper Wound, Oil immersed, CRGO Core type Naturally cooled, Built-up with class "A" insulation, having Primary Voltage [HT] 11 KV and Secondary Voltage [LT] of 433 Volts, Delta connected on 11 KV Side & Star connected on 433 Volts side, designed & constructed with particular reference to Tropical Condition, conforming to IS – 1180 with latest amendment including taking down of existing BER Transformer of 500 KVA of any type with Cable Box capacity from the foundation,disconnecting all electric connections, transporting and depositing the Transformer to MES Store Yard including necessary T & P including refixing existing HT / LT Busbar and Cables etc. complete all as specified and as directed and comprising of the following Specification and Fittings: Continuous Rating : 750 KVA No-Load Voltage Ratio : 11 KV / 433 V Tapping on HV [%] : ± 7.5, ± 5, ± 2.5 Phase & Frequency : 3 Phase & 50 Hz Connection : Delta Star Vector Group : DYN 11 Cooling : ONAN Type : Outdoor

Note : The Transformers shall also be provided with following Terminal Arrangement & Fittings and rate quoted against respective item is deemed to be included for the same: Terminal Arrangement: [a] HV & LV Side: Cable Box [b] Quad furcating cable box with five compression glands for PVC Cable and One additional neutral terminal shall be brought out separately for earthing purpose on LV Side. [c] First filling of new and unused Transformer Oil [IS – 335 Marked], filtered and tested up to 60KV dielectric strength at 2.5mm air gap between testing electrodes. Certification of dielectric strength shall be submitted by the Contractor after filling the oil. Transformer Oil shall be got tested by APEPDCL. [d] Apart from routine tests mentioned in these tender documents and relevant IS, pre-commissioning inspection of Transformer shall be carried out by Senior Electrical Inspector / Electrical Inspector. [e]Pcc foundation/Plateform shall be measured and paid separately under relevant item of this schedule.

Fittings: [a] Externally hand operated Off–Circuit Tap Switch with position indicator and locking device. [b] Conservator with Oil Gauge, filling hole with plug & drain hole with plug [c] Undercarriage with four plain rollers [d] Oil filling hole cum air release plug [e] Drain Valve cum Sampling Valve [f] Top Filter Valve with Plug [g] Rating Plate with Diagram Plate [h] Lifting lugs for Transformer [j] Lifting lugs for Core [k] Earthing Terminals [l] Thermometer Pockets [m] Silica Gel Breather [n] Explosion Vent [o] Double Float Buchholz relay [p] 150mm size Oil Temperature indicator [q] 150mm size Winding Temperature indicator [r] Marshalling Box with Double Window [s] OCTC

Earthing complete with Galvanised Steel Earth Plate Electrode 600 X 600 X 6 mm thick burried directly in ground [earth pit not less than 2.25 m deep below ground level] with top edge of Plate not less than 1.50 m below normal ground level connected to 32 X 6mm GI Strip [Earth Lead] and GI pipe 50 mm, Medium Grade for earthing lead protection to the extent of maximum 7.5m, Earth Plate Electrode surrounded by 150mm thick packed layers of Charcoal and Common Salt filled in alternate layers, connected to the Plate by means of GI Bolts & Nuts complete all as per Electrical Plate No. 3 of SSR Part – I, connected to panel / DB including testing on completion including main earthing, Charcoal, Common Salt, PCC [1:2:4, Type B1] Pit with RCC 1:2:4, Type B1 Cover, 50 mm thick with 6 Nos, 8 mm dia TMT bars in both ways, MS frame made with 40 X 40 X 6 mm Angle Iron, MS Funnel with 20 mm bore, medium grade GI Watering pipe, wire mesh, earth work excavation, return filling, removal of surplus soil etc. including taking down of existing earthing set complete all as specified.

Supplying, laying and testing XLPE insulated and PVC sheathed, FRLS, armoured heavy duty underground cable, ISI marked with aluminium stranded conductor 1100 Volt grade of size 3.5 Core, 400 Sq.mm cross section suitable for earthed system, laying in trenches/duct/fixed to poles/drawn through pipes/sleeving through pipe in duct, including suitable size Double compression copper stainless steel cable gland, crimping type cable lugs, sockets etc. complete all as specified and as directed.

Taking down existing LT UG cable of size 3.5 Core x 300 Sq.mm complete all as specified and as directed. Note: Excavation & earthwork shall be measured and paid separately.

Supplying, Installing, Commissioning and Testing of CPRI Prototype tested, Factory made, Platform Mounted, Dust and Vermin proof LT Cubical Panel Board, Compartmentalised, Outdoor type, fabricated with 3.15mm thick CRCA Sheet and shall be given pre-treatment for degreasing, phosphatising etc. in seven tank process and shall be powder coated with RAL7035 coat with matt finish after due preparation of surfaces, suitable for, 1000 volts 3 phase, 4 wire, 50 HZ AC supply system with 1000 Amps rating TPN bus bars of high conductivity Aluminium and shall be provided with colour coded heat shrinkable sleeves mounted on porcelain/ SMC insulator supports, suitable double Compression Copper Cable Glands and panel shall be provided with separate compartments for each switch, with gland plates, lifting hooks, shutter type ventilating louver at both top & bottom duly internally secured with wire mesh, with suitable internal wiring with copper cable of suitable size etc with double stud hinged door, front openable with locking arrangement including interlocking with switch gears and to withstand short circuit fault level of not less than 100KA and degree of protection shall be IP 65. The panel shall be fixed with angle iron frame made of angles of size 75 X 75 X 8mm at Corners and ISMC of suitable size for base, embedded 600 mm below ground level in PCC 1:2:4, Type B–1 using 20mm grade stone aggregate, 600 mm above ground level complete including connecting up with existing incoming and outgoing cables etc. and comprising the following including disconnecting, dismantling of existing feeder pannel all as specified and as directed:

[a] ACB, 1000 Amps, FP, 50 KA, 415 Volts, 3 Phase, AC, 50 Hz, Micro Processor Based – 01 No. [Incoming] [b] MCCB, 630 Amps, TP, 25 KA, 415 Volts, 3 Phase, AC, 50 Hz, Micro Processor Based – 02 Nos [Outgoing] [c] MCCB, 400 Amps, TP, 25 KA, 440 Volts, 3 Phase, AC, 50 Hz, – 4 Nos [Spare] [d]Digital Multifunction Meter with suitable CT coils [e] Colour Coded LED Phase Indicating Lamps for each Phase – 1 Set.

Excavation in trenches not exceeding 1.5m wide and not exceeding 10 Sq.m on plan area and not exceeding 1.5m deep in Soft / Loose soil complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25cm thick of excavated soil complete all as specified and as directed. Note: A deduction of 10% shall be made from total computed volume of filling to cater in bulk irrespective of machinery used for ramming.

Removal of excavated material [Soil] to a distance not exceeding 50 m and depositing where directed at a level not exceeding 1.5m above the starting point complete all as specified and as directed.

M & L for Dry River Sand cushioning over and around the cable for cable protection in trenches, levelled and punned down complete all as specified and as directed. Note: The punned down thickness shall be measured for payment.

Supply and lay Bricks, common burnt clay building bricks, sub–class "B", Designation 75 in trenches for cable protection complete all as specified and as directed.

Supplying and laying GI pipe, 40mm dia, Light grade for cable protection at road crossing etc. or fixing on wall / poles of any type, secured with clamps complete all as specified and as directed.

M & L for Cutting Bituminous Road / Hardstanding etc. as required for Jointing / Laying Cables and Pipeline of width not exceeding 300mm and depth not exceeding 600mm and refilling after laying and making good with PCC 1:2:4, Type B1 using 20mm graded stone aggregate, 100mm thick complete all as specified and as directed.

M & L for PCC 1:3:6, Type C-2, using 40mm graded stone aggregate as in Foundation/Platform for Transformer including use of necessary form work and finishing the exposed surfaces even and smooth complete all as specified and as directed.

S A R CONSTRUCTIONS

MURALI KRISHNA ASSOCIATES

vijetha enterprises

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Power engineering Associates

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