SPECIAL REPAIR TO OVERHEAD PS WATER TANKS OF PUMP HOUSE NO 01 and 05 AND VOLTAGE STABILIZERS (04 NOS) INSTALLED AT SUB STATION NO 1, 2, 3 and 4 AT AF STN MOHANBARI UNDER GE (AF) MOHANBARI

Amount

Disconecting pipe line connections, taking down carefully the old rusted and leakage pressed steel plates to the ground for replacement work of size 1.25m*1.25m*5mm/1.25m* 3.75m* 5mm including jointing materials i e lead, wire/wool, putty/compound etc from 10000 gallons capacity PS over head water tank installed on 40 to 50 foots height staging complete all as specified and directed.

Supply, fixing, testing and commissioning pressed moulded thermosetting GRP water tank (IS-14399) of suitable size and of capacity not less than 45000 Litre each including manhole panels on the roof with proper locking arrangement fixed at any position installed on 40 to 50 foot height staging with the required number of holes on the plates and other all required joining materials i.e. lead wire/wool, putty/compound, nut, bolt, and washers etc to make the jointing portion absolutely leak proof complete all as directed. Note for item 1 & 2:- Work shall be carried out at height hence safety devices should be provided by the contractor and rate for the same shall be deemed to be quoted by contractor for this provision in this item.

Disconnecting IV/OV connection earthing lead and taking down carefully defective / unserviceable Servo voltage stabilizers 3 Phase, 440 volts of capacity 30 KVA - (01 No at Ops complex), 225 KVA (01 No at Substation No - 2 & 01 No at Substation No-3) & 450 KVA- (01 No at Substation No - 1) , including shifting it from AFS Mohanbari to Dibrugarh / Tinsukia civil workshop as approved by GE by using mechanically approved crane and trailer and back to original sites after necessary repairs and installing the stabilizers at its original position including reconnection of IV/OV electrical cables, earthing connection and testing on completion complete all as specified and directed.

Dismantling of Servo Voltage Stabilizers by disconnecting all internal electric connection from IV/OV busbar sides after draining out of servo oil and issued to contractor as schedule credit and opening the top cover of the stabilizers by removing nuts, bolts, washers etc and complete reassembling of after replacement / repairing defective spare parts for the following capacities with testing and commissioning including carrying out the following tests to the entire satisfaction of Engineer-in-Charge :- (a) Insulation resistance test, (b) High voltage breakdown test , (c) Leakage current test , (d) Rate of correction test , (e) Continuous operation test (with and without load), (f) Short circuit test, (g) Locked rotor test for servo meter , (h) Output voltage test, (j) Di-electric test of oil.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

M&L for taking down the main transformer in repairs from the voltage stabilizer after dismantling from load, rewinding transformer with suitable size copper wire including varnishing and baking for insulation enhancement and reassembling main transformer for following capacities:-

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing of torque motor in repairs suitable for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs of Voltmeter (0-500Volt) for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs of control switch for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs of relays for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs of contactors for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs winding of dimmer of voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Supply and fixing in repairs of sensing trigger transformer of voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Replacement & testing of electronic cards including replacement of all worn out parts like IC's, regulators, condensors, triac, transistors for voltage stabilizer of following capacities complete all as specified and directed.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Repair to body and base of servo voltage stabilizers including providing of plain MS sheet of suitable guage thickness as per existing and site requirement and angle iron of existing thickness and size including necessary welding and brazing for following capacities complete all as specified and as directed.including necessary priming and painting work.

Capacity 450 KVA

Capacity 225 KVA

Capacity 30 KVA

Material and labour for dehydration and filteration of stabilizer oil by dehydration plant including testing of sample before and after dehydration and filteration to achieved 40 KV at 2.5 mm gap complete all as specified and directed. Note: (a) The report before filtration and after filtration to be submitted by contractor. (b) Stabilizer oil for topping up will be measured and paid separately.

Supply and toping up of new transformer oil (in sealed barrel) confirming to IS 335 Std having dielectric strength 40KV at 2.5mm gap after initial dehydration complete all as specified and directed.

Supply, fixing in repair /replacement / laying, testing, connecting and commissioning LT UG XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor, 1100 volts (Earthed type) grade of cross sectional area 300 sqmm, 3.5 core laid in trenches/ on wall/ pole/ duct/ pipe including suitable size of MS saddle clips (where ever cable laid in ceilings / walls without cable duct) complete all as specified and directed.

Supply, fixing in repair /replacement / laying, testing, connecting and commissioning LT UG XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor, 1100 volts (Earthed type) grade of cross sectional area 185 sqmm, 3.5 core laid in trenches/ on wall/ pole/ duct/ pipe including suitable size of MS saddle clips (where ever cable laid in ceilings / walls without cable duct) complete all as specified and directed.

Excavation in trenches not exceeding 1.50 mtr wide and not exceeding 1.50 mtr deep for taking out/ laying of under ground cable, pole, pipe, stay and getting out in soft soil strata including making good to the disbturbed surfaces such as hardstanding, footpath/ pavments complete all as specified and directed.

Returning filling in including spreading leveling watering and well ramming in layers not exceeding 25cm spread any type of soil complete all as specified and as directed.

Removing excavated materials not exceeding 50 mtr and depositing where directed at a level not exceeding 1.50 mtr above the starting point complete all as specified and as directed.

M&L for boring/ drilling (horizontally) hole manually under existing road, pavement, hard standing (maximum 10mtr in width) suitable for passing GI tubing upto 80 mm bore complete all as specified and directed. (Note : GI Pipe will be measured and paid seperately)

M&L for fine sand cushioning to under ground cable provided with a layer of sand 8 cm depth before laying of cable and 15 cm depth after laying and stretching the cable complete all as specified and directed. Note: (i) Punned thickness of sand shall be measured & paid.

M&L for well burnt sub class 'B' bricks of nominal size 230X115X75 mm abutting each other for mechanical protection of cable with width equal to lenght of brick complete all as specified.

Supply and fixing in replacement GI protection pipe of 80 mm dia light grade for cable protection including all fittings laid in trenches or fixed on pole/ walls with mild steel clamps, bolts, nuts and washers complete all as specified and directed

Supplying and laying in replacement of synthetic rubber insulated mats 2.5 mm thick for voltage upto 3.3 KV for electrical purpose as per IS 15652-2006 (superseding IS 5424) suitable for electrical shock safety of sizes 2m x 1m complete all specified and directed.

S&F in replacement of cross arms bracing supports clamps and back plates fabricated from structural steel section including nut, bolts, washers, welded, binding, cold as hot drilling holes for bolts in any shape or size as required duly painted with two coats of aluminium paint over a coat of red oxide primer after preparation of surface complete all as specified and directed.

Supply and fixing in repair of copper strip 20mm x 3mm with fixing screws for conductors/ earth lead including brazing and nut bolts jointing at all joints for building/ equipment laid through pipe/ trench/ surface complete all as specified and directed.

Supply and fixing in repair of galvanised iron strip 32mm x 6mm with fixing screws for conductors/ earth lead including welding and nut bolts jointing at all joints for building/ equipment laid through pipe/ trench/ surface complete all as specified and directed.

Supply and fixing in repair test point terminal block made of gun metal black or phosphorous bronz size 75mm x 75mm x 25mm drilled screwed including 3 Nos, 8mm dia and 25mm long hex head screws including MS box 2mm thick of suitable size complete all as specified and as directed.

M&L for earthing complete in repair / replacement of with copper plate 600mm x 600mm x 3mm thick electrode and 20mm x 3mm copper strip as earthing lead burried directly in ground vertically (earth pit not less than 2.25mtr deep below ground level) with top edge of the plate not less than 1.5mtr below normal ground level, the earth plate surrounded by adequate quantity of charcoal dust and common salt to a packed thickness of 15 cm on all sides connected to copper strip 20 x 3mm as earth lead by means of tinned copper/ brass bolts, nuts, check nuts and washers (including brazing) connected to main switch board / panel/ test point at the other including necessary earth work in any type of soil, returning filling in and removal of surplus soil, concrete pit in PCC (1:3:6) type C1, pre cast RCC 1:2:4 type B1 cover slab 54cm x 54cm x 5cm reinforce with 8mm dia bar TMT @150mm centre to centre both ways with one handle for lifting made out 8mm dia MS bar with wire mesh funnel, 20mm GI tubing medium grade for watering and 40mm GI tubing light grade for protection, test point, testing on completion all as shown in Electrical Plate No 3 of SSR Part-I complete all as specified and as directed.

M&L for earthing complete in repair / replacement of with galvanised steel earth plate 600mm x 600mm x6mm thick elecrode and 32mm x 6mm galvanised iron strip as earthing lead burried directly in ground vertically (earth pit not less than 2.25mtr deep below ground level) with top edge of the plate not less than 1.5mtr below normal ground level, the earth plate surrounded by adequate quantity of charcoal dust and common salt to a packed thickness of 15 cm on all sides connected to GI strip 32mm x 6mm as earth lead by means of bolts, nuts, check nuts and washers (including welding) of galvanised iron or steel and connected to main switch board / panel/ test point at the other including necessary earth work in any type of soil, returning filling in and removal of surplus soil, concrete pit in PCC (1:3:6) type C1, pre cast RCC 1:2:4 type B1 cover slab 54cm x 54cm x 5cm reinforce with 8mm dia bar TMT @150mm centre to centre both ways with one handle for lifting made out 8mm dia MS bar with wire mesh funnel, 20mm GI tubing medium grade for watering and 40mm GI tubing light grade for protection, test point, testing on completion all as shown in Electrical Plate No 3 of SSR Part-I complete all as specified and as directed.

KP GHOSH AND CO

M/S D G ENTERPRISE