UPGRADATION OF BER 66 11 KV TRANSFORMER AT MRS UNDER GE I R and D EAST BANGALORE

Amount

Power transformer step down, outdoor type of capacity 8.0 MVA (8000 KVA) 66 KV/11 KV, 3 Phase, 50 cycles AC with on load Tap Changing arrangements (with remote control panel operation) on 66 KV sides to vary secondary voltage from (+) 5% to (-) 15% in steps of 1.25 % (16 steps), impedance 7.35 % at normal / common tap No. 7 including suitable marshalling box and HV terminals 3 Nos outdoor bare bushings with sockets and LV Terminals connectors to connect the transformer with HT 11 KV XLPE power cable of size 400 Sqmm x 3 core with aluminium conductor and on secondary additional neutral with one No. solid porcelain type out door bushings with sockets on the transformer lid for earthing purpose complete in all respects with standard accessories and fittings conforming to IS-2026 primary side delta and secondary side star complete all as specified and directed. Make: ABB / SIEMENS / CG / VOLTAMP / KIRLOKAR. The salient features of the transformer shall be as below: - (a) (i) Transformer shall be DYN 11 vector group oil + A3 immersed naturally cooled, double wound electrolytic copper winding core type, Radiator cooled MS tank complete with first fill of transformer oil as per IS-335 with ONAN cooling system. The temperature of oil shall not rise 50 / 55oC over ambient. Transformer shall be painted with two coats of synthetic enamel paint with two coats of epoxy paint as per IS-632.

Standard Fittings: (ii) Rating and diagram plate alongwith levels whereever necessary. (iii) Earthing terminals - 02 Nos. (iv) Lifting Lugs (v) Thermometer pocket. (vi) Air release hole with plug. (vii) Oil filling hole with plug on & incl conseravator with drain valve & plug. (viii) Digital type oil indicator on one side of conservator with minimum and maximum oil level marking. (ix) Dehydrating breather - 01 No. (x) Oil conservator with drawn valve and plug. (xi) Sampling valves, top and bottom. (xii) Under base with flat treaded bi-directional rollers. (xiii) Drain cum bottom filter valve with plug. (xiv) Top filter valve with plug. (xv) Explosion vent with diaphragm, equalizer pipe (pressure release device). (xvi) Jacking lugs and hauling holes. (xvii) Inspection cover. (xviii) Detachable radiators with shut off valves between radiators & tanks. (xix) Radiator with air release hole and isolating valve. Oil drain hole with plug and lifting eye all as per manufacturer's standards. (xx) 150mm dia oil temperature indicator stem type.

(a) Remote tap position indicating meter digital type. (b) Tap change in progress signal lamps with belt. (c) Raise / lower push buttons for remote operation. (d) Inside illuminating lamp with door switch. (e) Supply on signals. (f) On / Off indicating lamp for individual cooling fans. (g) Suitable 3 core rating Transformer. Note: (a) Single limb IMPULSE TEST AND HEAT RUN TEST shall be carried out at Manufacturers factory or approved laboratory and the rate for the same is deemed to be included in the quoted rate. (b) pre dispatch Inspection and testing of Transformer at manufacturers factory premises shall be carried out by the representative or officer nominated by Accepting officer and all tests pertaining to IS : 2026 shall be carried out. The quoted rate deemed to include the cost of all arrangements by the contractor. (c) Site testing: Insulation resistance oil temperature alarm trip, Winding temperature alarm and trip, Bucholtz relay alarm and trip, Low oil level alarm, testing of annunciation systems by auxiliary relay triping of transformer, Polarity marking and phase sequence, Ratio test, dielectric strength and filtration if required should be carried out in presence of the Engr-in-Charge & authorised Engineer of the transformer manufacturer. The quoted rate deemed to include the cost of all arrangements by the contractor.

(d) Control cables shall be measured and paid separately under the respective of item of schedule. (e) Foundation and civil works as per manufacturers recommendation and shall be deemed to be included in rate quoted above. (f) Excavation, earth work & GI & copper strip for earthing shall be measured and paid separately. (g) The stud for neutrals shall be sufficiently long to fix 2 Nos strip earthing. (h) Cost of cable entry box on LV 11 KV side for 3 core XLPE 400 sqmm XLPE cable shall be deemed to be included in the rate quoted. (j) Routine test as per IS 2006 shall be conducted and test certificate shall be furnished. (k) Unit price deemed to be included the connecting of trip contacts of bucholtz relay and temperature indicator of windings of oil to the trip coil in panel board. (l) RTCC and AVR shall be suitable for automatic voltage regulation master follower scheme with tap position indicator as per tap indication in the OLTC mechanism, RTCC should be provided with control gear irrespective of fan ON / OFF indication, auto and manual control switch AC supply on and Tap changer in progress indication lamp, tap struck indication and alarm. (m) The erection of transformer shall be done under the supervision of manufacturer authorised representative. Contractor duly signed by authorised representative manufacturer and Engineer-in-Charge / representative of GE.

(n) LT Armoured control cables shall be measured and paid separately under relevant items of this schedule. (o) DYNAMIC SHORT CIRCUIT TEST shall be carried out in presence of the the representative or officer nominated by Accepting officer at Manufacturers factory or at approved laboratory. The quoted rate deemed to include the cost of all arrangements by the contractor. (p) Civil Work: All civil works including RCC / PCC Footing, Foundations, platform, plastering and finishing etc related to suitable for 8 MVA Transformer platform and also for Control Panels / equipments for installation and commissioning new Transformer. The depth of the foundation shall be as recommended by the manufacturer. The foundation drawing for Transformer as per Manufacturer recommendations, shall be submitted by contractor to the Engr-in-Charge and the same shall be approved by GE. The Rates for new fonadation, PCC works exc etc shall be deemed to be included in rate quoted above. Diamantling of existing old 5 MVA transformer platform including foundation related civil works completely and clearing of site etc shall be measured and paid under the respective item of Schedule.

Supply, lay, connect, testing and commissioning of HT XLPE cable of size 400 sqmm 3 core, XLPE insulated, insulation screened with extruded semiconducting compound in combination with copper tape (0.3 KA for one second), cores laid up, extruded PVC inner sheath with fillers, galvanised steel flat strip armoured and overall PVC sheathed cable, electric power cables (heavy duty) suitable for earthed system with aluminum conductor, 11000 V grade cross sectional area mentioned below confirming to IS : 7098 Part-II / 85 with latest amendments laid in trenches / ducts, fixed on walls / panels all as specified and directed. Note: - a) The High voltage test and other relevant test shall be carried out at site after laying and before commissioning and test report shall be submitted in triplicate to GE. b) Excavation, earthwork, sand cushioning, PCC cable cover protection pipe and joints shall be measured and paid separately.

Cable jointing kit for 11000 V grade cable for indoor termination cold shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 400 sqmm complete all as specified and directed.

Cable jointing kit for 11000 V grade cable for outdoor type termination cold shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 400 sqmm complete all as specified and directed.

Supply, install, testing and commissioning of control and relay panel indoor type made out of CRCA sheet 2mm thick conforming to SI 823 totally enclosed dust and vermin proof with front and rear openings. The panel should be powder coated after 7 tank process all as specified for the operating of outdoor 66 KV transformer for complete operational working of outdoor 66 KV CT, PT, Differential Protection, SF-6 breaker and transformer etc complete all as specified and directed by the Engineer-in-Charge with the following accessories: - Make: ABB / SIEMENS / CG / VOLTAMP / KIRLOKAR. (a) 16 points solid state alarm anunicator suitable for 110V DC-01 No. (b) Hooter 110 V DC - 01 No. (c) Ammeter 0-75-150 A Size 96 mm x 96 mm - 01 No. (Digital type) (d) Voltmeter 0-75 KV Size 96mm x 96 mm - 01 No. (Digital type) (e) Power factor meter (0.5 lag - 1-0.5 lead), 1A, 110 V, 3 phase 4 wire 3 elements, size 96mm x 96mm - 01 No. (Digital type) (f) Frequency Meter (45-50-55) Hz, 110 V, AC size 96mm x 96mm - 01 No. (Digital type) (g) KVAR meter 3 phase, 3 Phase 4 wire 3 elements AC size 96mm x 96mm - 01 No. (Digital type) (h) Energy meter 3 phase, 3 Phase 4 wire 3 elements 110 V, Flush mounting - 01 No. (j) Semaphore indicator 48 mm dia, 110 Volt DC - 03 Nos. (k) Semaphore indicator 63 mm dia, 110 Volt DC - 01 No. (l) Breaker control switch with lost motion device - 01 No.

(z) LED Indicating lamps 110 volt DC, suitable for 240 V DC -01 No. (aa) Trip ckt, supervision relay type suitable for 110 V CD case 1/2 NH - 01 No. Make: ABB / SIEMENS / EASUN REYROLLE (ab) DC supply supervision relay suitable for 110 Volt DC to monitor the failure of DC supply to switch it is connected. Make: ABB / SIEMENS / EASUN REYROLLE.

Control cable 1100 Volts with PVC insulated and steel armoured with multi stranded copper conductor of the following sizes:-

16 core 1.5 Sqmm

4 core 2.50 sqmm

(c) 4 core 1.5 sqmm Note for item Nos. 6.01 to 6.03: (i) Control cabling shall be executed and certified through a licensed agency as per IE rules. (ii) Submit the single line diagram of all control wiring of transformer and CRP panel.

Supply, install, testing and commissioning of CTs 66 KV class of following dual ratio, out door type oil immersed as per IS-2705 [Part-I & IV] (1992) with insulator electrical connection as per manufacturer's instructions complete. CT shall be rated voltage of 72.5 KV, accuracy 5 P for core 1 class 1 for core 2 class LPS for core 3 VA burden should be suitable to cater for protection ratio 150-75 / 1-1-1 Amps CT Ratio, Core-1: 1.0, Core 2 : 5P 10, Core 3 : PS, including marshalling box for CT, complete all as specified and directed. Make: SCHNEIDER / CROMPTON GREAVES / KAPPA / AE / STATCON.

Danger Notice Board plate of 1.6 mm thick MS Sheet vitreous enamelled white with letter figures and conventional skull & bones in single red colour in front side fixed with MS Clamps bolts, nuts, washers etc for 66 KV equipment as per IS-2551-82 of size 250 x 200mm complete all as directed.

Reinforced pre-cast concrete cable cover class EHV Type-2 with peak size 600 x 230 x 50 mm complete all as specified and directed.

Excavating in trenches, not exceeding 1.5m wide and not exceeding 1.5m depth for laying cable etc and getting out in hard / dense soil complete all as specified and directed.

Returning, filling in including spreading, levelling, watering and wall ramming in layers not exceeding 25 cm thick in hard / dense soil complete all as specified and directed.

Removing excavated soil to a distance not exc 50m and depositing where directed at a level not exceeding 1.5m above the starting point complete all as specified and directed.

Supply and spreading of dry clean river sand free from clay laid in trenches for cable cushioning covering both top and bottom of cable complete all as specified and as directed. Note: For the purpose of payment punned thickness will be measured.

Demolition of existing RCC / PCC concrete base foundation of any description and making good of surface for making fresh foundation complete all as specified and directed.

Supply & Laying of GaIvanised iron, tubing medium grade for protection of cables at road crossing complete all as specified and of size 150mm dia complete all as specified and directed.

Dismantling existing outdoor transformer 5 MVA 66/11 KV, RTCC panel, 66 kv transformer control panel, carefully after disconnecting all the electrical connection from primary and secondary side of the transformer including neutral and body earthing control cable connections shift the transformer from the 66KV switch yard to MES Store yard for further action all as directed by Engineer-in-Charge.

Earthing complete with GI earth plate electrode 600mm x 600mm x 6.3mm thick buried directly in ground vertically to a depth of not less than 2.25m deep below ground level with the top edge of earth plate at a depth of not less than 1.5m below ground level connected to GI earth strip 32 x 6mm by means of bolts, nuts, washers of galvanised iron or steel, GI earth strip shall be protected by 40mm dia GI pipe 'medium grade', watering pipe 20mm dia GI pipe 'medium grade', GI wire meshed funnel, alternate layer of charcoal and salt on all side to earth plate upto a thickness of 150mm, filling of soil in earth pit upto GL and connected to earth plate including necessary excavation & earthwork, PCC (1:3:6) type C-1 earth chamber, 40mm thick RCC cover (1:2:4) mix with 6mm to 8mm dia nominal reinforcement @ 150mm c/c both ways etc complete all as shown in electrical plate No. 3 connected to earthing test point, including testing on completion, complete all as speciifed and directed. Note: (i) Rates quoted shall deemed to include the cost of excavation and earth work, PCC pit, funnel and RCC cover. (ii) GI strip 32 x 6mm beyond 7.5m shall be measured and paid separately.

Earthing complete with Copper plate electrode 600 x 600 x 3.15mm thick and 20 x 3mm copper strip as earthing lead burried directly in ground vertically to a depth not less than 2.25 mtr deep below GL with the top edge of the plate at a depth not less than 1.5 mtr from below normal GL, connected to and including Copper strip 20x3 mm as earthing lead by means of nuts, bolts, washers, checknuts of copper and connected to earthing test point all as shown in electric plate No. 3 of SSR Part l of 2009 and as specified or indicated and testing on completion including excavation / earth work in any type of strata PCC (1:3:6) type C1 earthing chamber, pre cast slab 50mm thick in cement concrete (1:2:4) type B1 (Reinforced with welded steel wire fabric (XPM) weight not less than 4 Kg/sqm,cast iron frame, funnel with wire mesh, including copper earthstrip with GI protection pipe of 40mm medium grade 7.5 meter long etc complete and testing on completion all as specified and directed. Note: (i) Rate quoted shall deemed to include cost of excavation in any type of strata, RFR and removal upto 50metre, PCC pit, funnel and RCC cover plate. (ii) Copper strip 20 x 3mm beyond 7.5m will be measured and paid seperately. (iii) Earth resistance not exceeding 1.0 ohm. (iv) Earth strip to be connected with the existing earth material and earth grid.

GI strip of size 32 x 6mm fixed by means of GI bolts, nuts and washers laid underground complete all as specified and directed. Note: The quoted rate shall be deemed include the cost of earthwork excavation, returning filling and removal surplus soil.

Copper strip of size 20 x 3mm with necessary copper nuts, bolts, washers, etc for earth mat / earthing chamber connections etc, complete all as specified and directed.

Auxiliary power supply system for protection of panel complete with maintenance free lead acid batteries bank mounted on MS rack and connection complete in all respect with installed capacity of 110 Volts of 2 Volts, 100 AH including 110 V, 25 Amps booster and trickle charger as per specification and including DC DB for charger complete with DC ammeter voltmeter switches for 11 KV system complete all as specified and directed.

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