Special repair/replacement of OCB/VCB and Servo Voltage stabilizer against BER under GE (East) Mathura

Taking down of old BER servo voltage stabilizer/VCB/OCB of any capacity and make from sub stn by lifting arrangements and vehicle and deposited to mes store yard all are as specified and as directed by Engr-in- charge.

Supply, install, testing and commissioning of servo controlled Voltage stabilizer capacity 250 KVA, confirming to BIS 9815 : Part1 : 1994, for automatic controlling/ regulating of voltage, three phase, 50 Hz, naturally oil cooled, outdoor type, copper wound, metallic body duly powder coated with lifting hooks two nos & designed for input variation between 360 V to 480 V with output voltage stabilized at 415 with accuracy ± 1 %, rate of correction 8 volt/second for single phase and 13 volt/second for phase to phase, suitable for unbalanced supply and load, complete with digital display voltmeter, ammeter with multi functional meter, comprising over load/ short circuit protections, high/ low voltage cut off, bypass arrangement, phase fail protection complete with Required Plinth foundation all as directed by Engr-in- Charge.

Supply, install, testing and commissioning of servo controlled Voltage stabilizer capacity 300 KVA, confirming to BIS 9815 : Part1 : 1994, for automatic controlling/ regulating of voltage, three phase, 50 Hz, naturally oil cooled, outdoor type, copper wound, metallic body duly powder coated with lifting hooks two nos & designed for input variation between 360 V to 480 V with output voltage stabilized at 415 with accuracy ± 1 %, rate of correction 8 volt/second for single phase and 13 volt/second for phase to phase, suitable for unbalanced supply and load, complete with digital display voltmeter, ammeter with multi functional meter, comprising over load/ short circuit protections, high/ low voltage cut off, bypass arrangement, phase fail protection complete with Required Plinth foundation all as directed by Engr-in- Charge.

Supply, install, testing and commissioning of servo controlled Voltage stabilizer capacity 400 KVA, confirming to BIS 9815:Part1 : 1994, for automatic controlling/ regulating of voltage, three phase, 50 Hz, naturally oil cooled, outdoor type, copper wound, metallic body duly powder coated with lifting hooks two nos & designed for input variation between 360 V to 480 V with output voltage stabilized at 415 with accuracy ± 1 %, rate of correction 8 volt/second for single phase and 13 volt/second for phase to phase, suitable for unbalanced supply and load, complete with digital display voltmeter, ammeter with multi functional meter, comprising over load/ short circuit protections, high/ low voltage cut off, bypass arrangement, phase fail protection complete with Required Plinth foundation all as directed by Engr-in- Charge.

Supply, install, testing and commissioning of servo controlled Voltage stabilizer capacity 630 KVA, confirming to BIS 9815:Part1 : 1994, for automatic controlling/ regulating of voltage, three phase, 50 Hz, naturally oil cooled, outdoor type, copper wound, metallic body duly powder coated with lifting hooks two nos & designed for input variation between 340 V to 480 V with output voltage stabilized at 415 with accuracy ± 1 %, rate of correction 8 volt/second for single phase and 13 volt/second for phase to phase, suitable for unbalanced supply and load, complete with digital display voltmeter, ammeter with multi functional meter, comprising over load/ short circuit protections, high/ low voltage cut off, bypass arrangement, phase fail protection complete with Required Plinth foundation all as directed by Engr-in- Charge.

Plinth for outdoor type Servo voltage stabilizers:- M&L for the following:- (i) Providing 100mm thick PCC platform on top of brick masonry of size 3 X 3 mtrs (outer dimensions) and 1.2 mtr high from ground level and 0.50 mtr below ground level for placing voltage stabilizer and steps complete all as specified and directed. (ii) Excavation and earth work for foundation of brick masonry including R/F and removing surplus soil. (iii) 100mm thick cement concrete (1:4:8) type D-2 (using 40mm graded stone aggregate) as in foundation of brick masonry. (iv) Brickwork with fly ash brick in cement and sand mortar 1:6 including 15mm thick cement plastering in cement and sand mortar 1:4 over exposed surfaces. (v) 100mm thick hardcore using brick bats of gauge not exc 63mm. (vi) 100mm thick PCC (1:4:8) type D-2 (using 40mm graded stone aggregate) as in sub base. (vii) 100mm thick PCC (1:2:4) type B-2 (using 40mm graded stone aggregate) as in flooring finished even and fair. (viii) Two coats of cement base paint over a coat of cement primer over plastered surfaces complete. (ix) Earth filling including watering and ramming in layers of 25cm inside the platform complete. (Earth obtained from excavation shall be used for filling).

M&L for earthing complete with galvanized steel earth plate electrode size 600mm x 600mm x 6.0mm thick buried directly in ground vertically in a pit of depth not less than 2.25 mtr below ground levels with top edge of the earth plate not less than 1.5 mtr below normal ground level surrounded from all sides by mixture of charcoal and common salt and electrode connected to GI earth strip 32 x 6mm by means of bolts, nuts, check nuts and washers of galvanized including GI protection pipe light grade 40mm dia connected to main earth wire on pole or control board and GI pipe medium grade 20mm dia bore for watering funnel with wire mesh. RCC cover with concrete (1:2:4) type B-1 using 8mm bars @ 100mm C/C both way with frame, PCC chamber pit with PCC (1:3:6) type C-2 including necessary excavation and earth work all as shown in electrical plate No 3 connected to earthing test point and testing on completion including taking down old existing earthing complete all as specified & directed. Note : The unit rate includes for protection pipe and GI Earth strip 32 x 6mm from top of earth plate upto 7.5m above ground level.

Supply, installation, testing and commissioning of HT 11 KV Vacuum Circuit Breaker (VCB) indoor type suitable for 11KV having rupturing capacity 350 MVA, 630 Amps, 25 KA for 3 Sec for incomer confirming to IEC 62271-200, class front accessed comprising with items including taking down old unserviceable VCB and deposited in MES Store yard. (a) 630 Amp continuous rated electrolytic copper bus bars, droppers and bus bars should be insulated with full system voltage sleeves of Raychem or equivalent. (b) Trolley mounted vacuum circuit breaker as per IEC 62271-100. Vacuum circuit breaker should have three no resin encapsulated vacuum bottles. (c) Motorized spring charging mechanism with integral spring charging handle for manual spring charge. (d) Cast resin current transformer 11 KV, 100-50/5-5A, Core1 :class1.0, 15 VA, Core2:5P10, 15VA (e) Closing & Tripping Coil Suitable for 24 V DC (f) Cast resin potential transformer 11KV/V3/110V/V3/110V/3, 50VA, CI 1.0, CI 3P and HT fuse at the primary end and 04 pole MCB at the secondary end of the PT. (g) Accessories like local remote switch, breaker control switch (T-N-C), space heater with thermostat, DC & AC control circuit through MCB, indicating Lamps for RYB, Spring charge, DC supply healthy, breaker ON/OFF, breaker in SERVICE/ TEST as per manufacturer. (h) Multifunction meter (j) Digital Ammeter and Digital voltmeter. (k) Master Trip Relay. (l) Comprehensive numerical protection relay as per IEC 61850 compatible for directional and non directional O/C, E/F, U/V, O/V protection. Having following additional facilities: 1. Trip ckt supervision. 2. Disturbance recorder 3. Event log with date and time 4. Measurement and control feature

(m) Panel should also have additional facility like: 1. Intermittent rated closing and tripping coil. 2. Fully internal arc type tested ( 25 KA for 1 Sec). 3. Vacuum bottles should be epoxy encapsulated. 4. Breaker shall be provided with following contacts. 5. Racking in/out, manual closing/tripping of CB with compartment door closed a. Auxiliary switch with 6NO + 6NC mounted on the draw out portion of the switchgear. b. Position switches with 3 NO + 1NC contacts for each position in service and test. 6. Panel height should not exceed 2300mm. 7. Mechanical Operating Counter 8. Automatic Safety Shutters 9. Secondary Plug in Contacts 10. Anti Pumping Relay 11. Type test Reports for internal arc test to be submitted alongwith submission of drawings. COMMON NOTES: (b) Drawings for panels shall be got approved from GE before placement of order by contractor. (c) CT ratio as given is tentative and is subject to final approval of GE. (d) Pre-commissioning test of panel shall be carried out be EI from HQ CESWC or rep of AO with in overall quoted rate. (e) Any modification required to match the system with existing system is deemed to be included in overall cost quoted by contractor. (f) Pre dispatch inspection of panels can be carried out at factory premise by rep of Accepting Officer within over all quoted rate of the item. Decision of Accepting Officer shall be final in this regards.

M&L for Chemical Earthing to Transformer / equipments etc with & including Copper earth plate electrode of size 90 cm x 60 cm x 5 mm thick buried vertically in ground (earth pit not less than 2.25 m below normal ground level) with top edge of the earth plate at a depth not less than 1.5 m below ground level, the earth electrode surrounded by adequate quantity of back fill chemical compound to increase the conductivity of soil, connected to & including copper earth strip 32x6 mm as earth lead, including nuts, bolts, check nuts & washers of galvanized iron or steel and riveted/welded to earth plate at one end and other end of strip connected to Transformer / equipment body / test point with two Nos nuts bolts or welding with structure, Copper earth strip encased in and including 40mm bore GI light grade pipe with all fittings from upper edges of earth plate upto 7.5 metre above ground level fixed with and including 25x3mm flat iron clamps, bolts, nuts and washer and also including providing watering pipe 20mm bore GI pipe medium grade from earth pit to top of electrode and including funnel, wire mesh, copper lugs etc complete with earth pit of PCC M-10 (Nominal mix) using 20mm graded stone aggregate, 50mm thick earth pit cover of RCC M-15 (Nominal mix) using 20mm graded stone aggregate with MS TMT reinforcement bar of 8mm dia @ 150mm centre to centre both ways, MS handle 10mm dia made to shape, PGI funnel, wire mesh complete all as specified and shown in electrical plate No 3 of SSR Part-I including necessary excavation and earthwork in any type of soil, returning, filling in approved soil and disposal of surplus soil to a distance not exc 50m complete and making good the disturbed surfaces of wall floors etc without claiming extra cost including dismantling & taking out old existing unserviceable earthing complete all as specified and as directed.