REPAIR AND MAINTENANCE TO TRANSFORMER OF VARIOUS CAPACITY INCLUDING MAINTENANCE OF HT DISTRIBUTION SYSTEM, REPAIRS/REPLACEMENT OF UNSERVICEABLE HT CABLES AND CONNECTED ALLIED WORKS AT CDM SECUNDERABAD UNDER AGE E/M NO 1 OF GE (UTILITY) SECUNDERABAD

Amount

Excavating in trenches, n exc 1.5 m wide and n exc 1.5 m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc. n exc 10 sq m on plan and n exc 1.5 m in depth and getting out in Hard / Dense soil complete all as specified.

All as per Item No 1.00 here in before but depth above 1.5 m & below 3 m complete all as specified and directed

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exc 25 cm in soft/loose/hard/dense soil complete all as specified and directed.

Removing excavated material (soils) n exc. 50m and depositing where directed at a level n exc. 1.5 m above the starting point complete all as specified and directed

M & L for sand cushioning to underground cable including punning down of sand in layer complete all as specified and directed. Note :- Thickness of sand cushion after punning down i.e 18 cm shall be measured for payment

M&L for PCC 1:3:6 type C2 (using 40mm graded stone aggregates) as in foundation, filling and mass concrete complete all as specified and directed.

M&L for cement concrete 1:3:6 type C-1 using 20mm size graded stone aggregates as in coping / pedestal of poles including necessary formwork complete all as specified and directed.

Supply and lay un-reinforced precast concrete cable cover , class , HVP , Type I flat size 300 x 180 x 40 mm laid dry in trenches over under ground cables complete all as specified and directed.

Supplying, Erecting and fixing in replacement Steel tubular swaged poles complete with cast iron base plate, finial taper plug, bolts, nuts & screws as specified type 410 SP-55 (11.0 metres long) complete all as specified and directed.

M&L for cleaning/ painting the HT poles of OH lines and HT four pole/ two pole structures complete with crossarms any height and any description thoroughly with necessary cleaning agent including scrapping up of old corroded paint dirt/ rust carefully and applying two coats of synthetic aluminium paint including marking and colour washing of pole coping details as are under:-

(a) Two poles with crossarms

(b) Four poles with crossarms

(c) HT 11 mtr single pole

Material and labour XLPE insulated (Earthed) , screened PVC bedded, galvanized steel strip or wire armoured, electric power cables(heavy duty) with aluminium conductor, 11000 volts grade,3 core, cross sectional area 95 sq.mm including inspection and testing. including taking down old U/S HT cable complete all as specified and directed.

All as per item No 11.00 above but for size 120 sqmm

All as per item No 11.00 here in before but for size 185 sqmm

M & L for Cable jointing kit for 11 KV (Earthed) grade cable for Straight through heat shrinkable type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 sqmm to 95 sqmm complete all as specified and directed.

All as per item No 14.00 above but for size 120 sqmm to 185 sqmm

M & L for Cable jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrinkable type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 sqmm to 95 sqmm complete all as specified and directed.

All as per item No 16.00 above but for size 120 sqmm to 185 sqmm

S&F cable route indicator for HT UG cable of 11000 volts bolted with 40x6 mm flat iron member of height 0.60 mtrs and 80 mm CI plate embeded in PCC 1:3:6 type C2 of size 20x20x30 cm block complete all as specified and directed.

Finding out Fault in existing U/G HT cables laid below 1 Mtr depth of earth surface in any location of GE (U) secbad Area by the expert engineers team of state electricity board using and hiring of HT fault locator complete specified and directed. Note : HT Straight through Joint kit will be paid and measured seperatly in relevent item of sch A.

Supply & lay 80mm dia bore GI tubing light grade in protection of cable at road crossing /hard standing/pole protection fixed with clamps as per site requirement etc all as specified including taking down U/S one.

Cutting the existing road straight by manual, depth and width not less than 1 mtr below ground level for passing of underground cable and filling back with excavated soil upto 75% road portion and 25% shall be made with cement concrete 1:2:4 (using 20 mm graded aggregate stone complete all as specified and directed.

Supply and stringing ACSR conductor of any size for LT/HT over head line connections of squirrel/weasel/Mink/Rabbit as per site requirement including taking down old unsv complete all as specified and directed.

M&L ACSR jumper in HT/LT overhead line as that of existing size including binding wire, nuts & bolts, washers complete all as specified and directed.

Cutting and trimming tree branches any girth and any size touching overhead lines and cleaning the distance 1.5 mtr length both sides of OH line with in a span and disposing the same, cleaning the site all as specified and directed.

S & F for Cross arms, bracing, supports, clamps and back plate, fabricated from structural steel section including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as directed including two coats of synthetic enamel paint over a coat of red oxide primer & including taking down old unsv, complete all as specified .

Supply and fixing Lightning arrestor expulsion type complete with all fittings transmission class , discharge capacity 65 Kilo amps suitable for 11000 volts and including taking down old unserviceable complete all as specified and directed.

M&L for disconnecting the electric supply and servicing of 11 KV AB switches upto 400 Amps by disconnecting, overhauling, greasing and reassembling same in its existing position, testing & commissioning including complete all as specified and directed. Note: Worn out spares shall be measured and paid seperately under relevant items

Supply only Female contact or fixed contact heavy duty and high conductive metal assembly brass/Gun metal suitable for 11 KV AB switch including taking down old u/s item complete all as directed by Engr-in-charge

Supply only Male contact or Moving contact blade heavy duty and high conductive metal assembly brass/Gun metal suitable for 11 KV AB switch including taking down old u/s item complete all as specified and directed.

Supply only Tinned copper flexible jumper 200A/400A suitable for 11 KV AB switch including taking down old u/s item complete all as specified and directed.

Dismantling of insulators any size and any type from existing HT line, removing materials taking to schedule of credit complete all as specified and directed.

S&F new pin type porcelain , vitreous, white, brown or green insulator including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut, 150 mm height and 150 mm dia suitable for working pressure 11000 Volts grade complete all as specified and directed.

S&F disc type insulator, porcelain, vitreous, white brown or green, 145mm high, and 255mm dia ball and socket type single disc assembly for tension with tension clamps for conductors, working pressure 11000 volts grade complete all as specified.

S&F post insulator 11 KV suitable for air break switch/drop out fuse with necessary nuts, bolts washers complete all as specified and directed.

Supply,test,install and commissioning of HT 11 KV outdoor type gang operated air break switch triple pole mechanically operated mounted on insulator and steel frame with operating mechanism worked from ground level for current rating upto 400 Amps and connecting up with jumpers including taking down old unserviceable one complete all as specified and directed

M&L for disconnecting and dismantling the existing indoor type, 11 KV, 25kA / 18.3 kA Horizontal Isolation horizontal draw out type VCB trolly of rupturing capacity 350 MVA,630 / 800 Amps from location and including replacement of unserviceable / damaged spare parts and repair / overhauling and carrying out with the following complete all as specified and as directed . Note: Spare parts will be measured and paid separately under relavent item

(i) Inspecting / overhauling of manual / motorised spring drive mechanism by checking mechanism, motor and gear assembly, big gear assembly, stop bolt assembly, main shaft interlocking assembly, closing spring assembly, small cam with screw,motor cut -off limit switch, butter fly swich assembly and apply multi grease lubricant to function smoothly.

(ii) Inspecting / overhauling of Shunt trip / Closing coil assembly,earthfault release assembly, auxilary switch and checking of electrical wiring system.

(iii) Inspecting / overhauling /cleaning and inspecting through insulators, vacuum interupters by carbon cleaner solution and apply dry graphite conductive sealant (STNVAC) for electrical contacts to avoid carbon deposits on contact surfaces.

(iv) Inspecting / cleaning / overhauling of bus bar chamber by checking of bus bars, spout insulators, space heaters and removing dust with vacuum cleaner / Blower and moisture by hot air blower and checking tightness of bus bars, insulators and applying STRIPPEX (A), STRIPPEX (B) insulating coating (STANVAC Make) and HT tape and test with High Voltage (DC) and meggering before and after high voltage test complete.

(v) Inspecting / cleaning / overhauling of CT / PT chamber by checking of Bus bars, spout insulators, space heaters, PTs, CT's and checking of wiring system and removing dust with vacuum cleaner / blower and moisture by hot air blower and checking tightness of bus bars, insulators and applying Anti Tracking Paint (STANVAC) on CT's and insulators and HT 11KV Tape.

(vii) Assembling all items / components parts to the respective postion and testing the breaker with High Voltage (DC) and meggering before and after high voltage test complete.

Supply only spare parts of VCB,11 KV,630 Amps 18.3 kA / 25 kA Harizontal Isolation Harizontal drawout type Make :- Schneider / CG / Siemens complete all as specified and as directed for the following :-

(a) Opening / Closing Push Button Assembly

(b) Motor Charging mechanism gear box assembly

(c) Limit Switch assembly

(d) Closing Coil Assembly

(e) Tripping Coil assembly

(f) Spring Charging Motor

(g) Auxiliary Switch with link

(h) Spring return latch assembly

(j) Vaccum Interupter assembly

(k) TNC Switch

(l) Ammeter Digital type 96 mm x 96 mm

(m) Voltmeter Digital Type 96 mm x 96 mm

(n)Multifunction meter digital type

(o) Indicating Lamps LED type 24 / 30 / 110 Volt DC or AC

(p) Relay Microprocessed based 3 O/C and 1E/F Type 7SR10 Siemens

(q) Master Trip Relay Type

(r) Power Pack with Battery Backup 230 / 110 AC to 30 / 110 VAC 1Phase

Testing and calibration of protective relays Earth fault relay Siemens 7SR10 and Master trip relay Siemens 7PJ12 (3NO+2NC) all as specified and directed

Disconnecting HT/LT electric connections of defective outdoor/indoor distrubution transformer step down 11KV / 433 Volts of capacity 50 KVA to 400 KVA, pole mounted/platform mounted, from uploading with help of crain and transporting at local authorised work shop, taking out complete transformer oil from tramsformer, stored the oil in separate container. Opening the top cover for lifting up the core assembly carefully dismantling same. Check the condition of HT & LT winding of transformer and providing new insulation such as craft paper insulation top gasket kreeper paper varnish etc, checking the transformer body for any leakages & rectify by welding as required cleaning the transformer body internal & externally painting the body with one coat of approved paint, Refixing of the same after ovening of core to achive the permissible insulation level and refilling the transformer oil after dehydration & filteration. Reassembling & testing complete and provide testing report, transporting back & up load the same at site by using crain safely. Reconnecting & commissioning al as specified.

Notes :- 1. Winding wires /strips of copper or aluminium shall be measured and paid seperately. 2. Spares like Breather assembly, Temp Gauge, LT Bushing, HT Bushing, Top up of new Transformer oil shall be measured and paid seperately under respective items. 3. Dehydration and filteration of existing oil shall be measured and paid separately. 4. Transportation of transformer if required ( to & fro) is deemed to be included. 5. Labour component for fixing of supply only items is deemed to be included in the rate quoted.

Supply only new HV/LV enamelled copper winding wire/strips of superior quality of suitable gauge and number of turns of any make, type and capacity including cork sheet, fibre glass insulation / paper insulation / cotton ampire tape, varnishing and wooden blocks, bolts, nuts and washers (Brass) soldering and other packing materials etc., all as specified and directed.

Re-conditioning of HT/ LT coil of transformer copper wound made out of super enamelled insulated copper strip as per existing gauge and number of turns of any make, type and capacity including insulating, binding varnishing and backing as required complete all as specified

Ovening/ heating of transformer of core rating 63 KVA to 500 KVA of with HV&LV coil / winding at steady temperature for up 72 hrs or above to get permissible insulation value complete all as specified

Supply only in replacement of HT 11 KV bushes porcelain, vitreous with brass spindle, threaded with washers, nuts, lock nut and rubber seal suitable up to 100 KVA transformer of any make / type / size all as specified.

All as per Item No.43.00 here in before but suitable for transformer of capacity 125 KVA to 400 KVA

Supply only in replacement of LT bushes 415 volts, porcelain, vitreous with brass spindle, threaded with washers, nuts, lock nut and rubber seal suitable upto 100 KVA transformer of any make / type / size all as specified and directed.

All as per Item No.45.00 here in before but suitable for transformer of capacity upto 500 KVA

M & L for top gasket sheet made out of cork sheet with suitable GI bolts, nuts, washers for transformer top cover complete for transformer of capacity up to 100 KVA all as specified and directed

All as per Item No 47.00 here in before but suitable for transformer of capacity upto 400 KVA

Supply and fill new transformer oil for top up, of low viscosity of approved make as per IS 355 of 1992 and di-electric strength 60KV all as specified and directed .

M & L for filtration and dehydration of existing transformer oil by means of centrifugal machine electrically operated at site different locations of transformer in running condition including testing of oil samples both before and after dehydratation and filteration. The dielectric strength of the transformer oil shall not be less than 60 KVA with 2 mm gap after dehydration all as specified and directed.

Supply and fixing in replacement breather assembly CI body of standard size filled with silica gel for transformers upto 200 KVA complete all as specified and directed.

Supply and fixing in replacement breather assembly CI body of standard size filled with silica gel for transformers above 200 KVA to 400 KVA complete all as specified and directed.

Supply and fixing in repairs temperature gauge circular type of standard size and suitable for indoor/out door type transformer upto 400 KVA capacity complete all as specified and directed.

Supply only tapping switch/gear changer mechanism for varying LT voltage in steps for transformer capacity upto 100 KVA complete all as specified and directed.

Description all as per Item No.54.00 here in before but suitable for transformer of capacity above 125 KVA to 400 KVA

Supply and fill Silica Gel in transformer of any capacity/ any make including taking down old silicagel complete all as specified and directed.

Supply only Tinned copper fuse wire of 16 SWG to 22 SWG or 30 Amps to 200 Amps capacity suitable for 11 KV supply

Supply and spread and levelling Graded coarse Aggregate in loose filling over the sand of gauge 40 mm nominal size in the installation yard all as specified.

Supply and lay Synthetic Rubber Insulated Mats of size 2.5 mm thick, 1m wide, 2 m length for working voltage upto 11 KV, for electrical purpose conforming to IS 15652:2006 (superseding IS 5424) suitable for electrical shock safety complete all as specified and directed.

S & F Danger notice plate of 1.6mm thick mild steel sheet, vitreous enamelled white, with letters, figures and conventional skull and bones in signal red colour and fixed with M.S. clamps, bolts and nuts of approved size, for HT, 25x20 cm size all as specified and directed.

vvcenterprises

STANDARD AGENCIES

Brite electricals

M Shyam Sunder

SANJEEV CONSTRUCTIONS

Sri venkateswara Electricals

L and S ENTERPRISES

sree venkateswara enterprises