REPAIRS AND MAINTENANCE TO HT ELECTRIC SUPPLY AND CONNECTED WORKS AT AIR FORCE STATION HAKIMPET UNDER GE (AF) HAKIMPET

Amount

Disconnecting the HT / LT connection, taking out the transformers form its plinth at any situation with the help of suitable crane and transporting the transformer to civil work shop for carrying out necessary repairs and bringing back and re-install in its original place of capacity upto 400 KVA, 11KV complete all as specified and as directed. Note: Repairs, rewinding and dehydration of transformers oil is measured and paid separately under relevant item of this schedule

Isolating the transformer by carefully dismantling the HT / LT and earth connections, draining out the oil from transformer to the required level and storing in cleaned containers, opening the top cover and conservator tank from transformer, rectifying the defects and dismantling and repalcing burnt out LT/HT bushes and refixing back the same duly repalcing with GI nuts, bolts & washers of suitable size and making all HT /LT connections as per the original, re-filling the transformer oil to the required level and testing on completion for capacity up to 400 KVA, 11KV complete all as specified and as directed. Note: (i) LT /HT bush, trasformer oil for toping up will be measured and paid separetly as supply only under relevent items.

Taking out complete core from transformers tank of capacity upto 400 KVA, cutting and removing burnt out winding and re-winding the same with super enamelled copper conductor of existing gauge with insulating materials, applying varnish, drying in heating chamber , re-assembling the transformer as per the original and testing on complete all as specified and as directed. Note: Shifting of transfermer from installed position to Civil work shop and back will be measured and paid separetly under relevent items.

Material and labour for testing of the transformer oil before filteration if the value becomes below 30 KV, then only filtration to be carried out complete all as specified and as directed. Note : (a) Test results obtained shall be recorded & produced to the Engr-in-Charge. (b) Measuring equipments & T&P required shall be arranged by the contractor. (c) The rate quoted shal be deemed to include for making necessary connections to filteration plant from transformer and switch gear. (d) Electric supply for the filteration plant will be made available free of cost.

Supply & fill transformer oil confirming to IS 1993,having dielectric strength 60 KV for topping up in transformers complete all as specified and as directed.

Supply & fix in replacement HT bushing with copper rod of transformer capacity 100 KVA, and upto 315 KVA complete all as specified and as directed.

Supply & fix LT bush with copper rod of capacity 100 KVA, and upto 400KVA complete all as specified and as directed.

Supply & fix in replacement temperature gauge 0 Degree Centigrade to 120 Degrees centigrade 100mm dia complete all as specified and as directed.

Supply & fix in replacement of oil level indicator glass in the conservator tank complete all as specified and as directed.

Opening the LT side cable box, disconnecting LT cables, removing unsv oil seal and supply and fix suitable oil seal and gasket for LT bushing of 11 KV / 422 V transformers incl replacement rusted nuts & bolts for the transformers of capacity 100 KVA upto 400 KVA complete all as specified and as directed.

M&L for preparation of old painted surfaces of 11 KV / 433 Volts outdoor type distribution transformer, painting with spray gun through out externally with two coats of synthetic enamelpaint of approved colour and writing machine nubmer in white colour on black backgroung complete all as specified and as directed for the following capacities of transformer :-

Transformer of capacity upto 100 KVA

Transformer of capacity above 100 KVA and upto 250 KVA

Transformer of capacity above 250 KVA and upto 400KVA

Taking down unsv breather assembly and supply & fix silica gel breather, suitable for transformer including sufficient quantity of silica gel complete all as specified and as directed for the following:

Transformer of capacity upto 100 KVA

Transformer of capacity above 100 KVA and upto 250 KVA

Transformer of capacity above 250 KVA and upto 400KVA

Disconnecting HT/LT Electric Supply and taking down old existing transformer up to 500 KVA capacity of any description and in any position from the existing indoor/outdoor substation, shifting the transformer to new location not exceeding 6 KM away from the starting point and installation, fixing and commissioning the transformer connecting the incoming and outgoing connection including testing the transformer complete all as specified and as directed.

Supply and filling silica gel in the breathers by removing from transformers and refixing the same after filling the silica gel at site complete all as specified and as directed.

Supply and fixing replacement of cracked/wornout synthetic rubberized cork gasket 8 mm thick for top cover of transformer capacity upto 400 KVA complete all as specified and as directed.

Supply and fixing replacement of cracked/wornout synthetic rubberized cork gasket 8 mm thick for HT/LT bushes etc complete all as specified and as directed.

Callibration and service charge of microproccessor E/F and O/C relay of VCB complete and calibrating with portable relay test kit to set time and fault level and adjustment of setting with according to load & time with SPDC of Telangana for proper functioning complete all as specified and as directed.

Taking out trolley of vacuum circuit breaker 630/800 Amps 11 KV from the cabinet and opening top cover, de-carbonizing moving and fixed contacts if required, lubricating, inspecting the wiring of Micro processor EF/OC relay, tripping coil electrical and checking of cleanliness of insulators and bushings and HV test on complete switchgear, circuit breaker and checking for manual/auto tripping system and placing back the breaker trolley in its original position including replacment of the items mentioned in schedule with necessary alteration in copper bus bar for fixing of new CT coil if required complete as follows :- (a) Check alignment of trucks for free movement (b) Check control wiring for correctness of connections, continuity and IR values (c) Power closing / opening, mechanically and electrically at extreme condition of control supply voltage (d) Check closing and tripping times (e) Check simultaneous closing of all three phases (f) Check vaccum (g) All functional units Note : The entire service / inspection shall be carried out by rep of OEM or any authorised service centre rep Note : (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 switch assembly, replacement of damaged control wiring DC/ AC for smooth function of VCB, testing of contact resistance, insulation resistance and apply multi grease lubricant to function smoothly. (ii) Inspecting/ overhauling/ cleaning and inspecting through insulators, vacuum interuptors by carbon cleaner solution and apply dry graphite conductive sealant for electrical contacts to avoid carbon deposits on contact surfaces. (iii) Assembling all items/ components parts to the respective position & testing the breaker with High Voltage(DC) and meggering before and after high voltage test complete. Note : The various unsv items required to be replaced shall be paid seperately under Ser Item No 19 to 21

Supply only for replacement of Shunt trip coil of 24 V DC for 11 KV HT VCBs complete all as specified and as directed.

Supply only for replacement of shunt closing coil for 11 KV HT VCBscomplete all as specified and as directed.

Supply only for replacement of spring charge motor , 230 v for 11 KV HT VCBs complete all as specified and as directed.

Supply and fix in replacement of 11 KV Resin cast single phase PT, 11 KV/RT3/110V/RT33: core 1: Class 1.0, burden : 50VA; with PT fuse complete all as specified and as directed.

Supply and fix in replacement of 11 KV resin cast single phase CT, CTR :50/5-5A, core1: class 0.5, burden : 15VA for metering, core 2 : class 5P10, burden : 15VA for protection, STC :18.4KA/1 Sec. complete all as specified and as directed.

Supply and fix in replacement of Numerical type protection relay having inbuilt features as follows : 50,51,50N,51N etc complete all as specified and as directed. Make : C&S or equivalent

Supply and fixing of self powered numerical type protection relay having inbuilt features as :50, 51(over current protection), 50N, 51N (earth fault protection) etc and consists inbuilt battery of capacity 2000 mAH complete all as specified and as directed. Make : CGI 14 S of CG or equivalent

Supply and fixing of vaccum interruptor bottle of 11 KV rated voltage and 630 amps rated current and operates at vaccum level of 10-6 bar and for 30000 mechanical operations complete all as specified and as directed.

S&F in replacement Indication Lamp, 22.5 mm dia, 24V DC, of RED/Green /Yellow /Amber /Blue /White as required on site complete all as specified and as directed. Make: L&T or equivalent

Supply & fix in replacement of Heater 150W , 230 V AC complete all as specified and as directed. Make - APT Control or equivalent.

Supply & fix in replacement Multi function meters class 1.0 with RS 485 digital type 96mm x96mm, Aux supply 230 volts alongwith hooter Make: Schneider Model No: PowerLogic TM EM 72xx Series

Supply and fixing of Battery backed power pack designed with IP20 ingress protection rating, dielectric strength of 2 KV, Surge test 4 KV suitable as per existing VCB complete all as specified and as directed as per following specifications :- (a) Input voltage of 230 V AC (b) Output voltage of 24 V DC (c) Back up of 15-20 min (d) Over voltage protection (e) LED indicator for input high, charger ON, Battery low, Battery mode, Over load, Output ON

Supply and fixing of Battery backed power pack designed with IP20 ingress protection rating, dielectric strength of 2 KV, Surge test 4 KV suitable as per existing VCB complete all as specified and as directed as per following specifications :- (a) Input voltage of 230 V AC (b) Output voltage of 110 V DC (c) Back up of 15-20 min (d) Over voltage protection (e) LED indicator for input high, charger ON, Battery low, Battery mode, Over load, Output ON

Supply and fixing of maximum demand controller (MDC) LED Indicator class 0.5S with RS 485 with standard size of 96 mm x 96 mm with alarm when demand approaches a preset value and switches off non essential load in pre programmed logical sequence suitable for HT 3 phase and 3 wire system and predictive mode of programming and necessary control wiring required complete all as specified and as directed. Make : Maxchek 400 of Secure of equivalent

Supply and fixing of TNC (Trip-Neutral-Close) breaker control switch complete suitable as per existing make, capacity and type complete all as specified and as directed. Make : L&T or equivalent

Supply and fixing of Ammeters, Digital type 96 x 96mm, CTR 50/ 30/ 5 Amps Class 1 acuracy, Aux Supply 230 Volts AC type : DM3258 Conzerv (Schneider Electric) complete all as specified and as directed.

Supply and fixing in replacement Voltmeters, Digital type 96 x 96mm, Voltage 11KV, PTR 11 KV/ 110V, class 1 acuracy, Aux Supply 230Volts AC, Type : DM 3257 Make Conserv (Schnieder electric) complete all as specified and as directed.

Material and labour for MS chequred plate of thickness 5mm including cutting into required shape fixing on equal angle complete all as specified and as directed.

Material and Labour painting of HT four pole structure of steel ISMB/Tubular pole/PCC pole after scraping thoroughly the existing rust/ dirt/ dust/ oil /grease and corroded paint from the steel surfaces of the structure including cross arms MS channel and applying two coats of aluminium paint over a coat of red oxide metal primer of approved quality including making of red and black strips above the coping upto a height of 1.5 Mtrs from the floor level with two coats of synthetic enamel paint complete all as specified and as directed.

Material and Labour painting of HT two pole structure of steel ISMB/Tubular pole/PCC pole after scraping thoroughly the existing rust/ dirt/ dust/ oil /grease and corroded paint from the steel surfaces of the structure including cross arms MS channel and applying two coats of aluminium paint over a coat of red oxide metal primer of approved quality including making of red and black strips above the coping upto a height of 1.5 Mtrs from the floor level with two coats of synthetic enamel paint complete all as specified and as directed.

M&L for loose filling with aggregate of gauge 40 to 50 mm of broken stone or boulders, deposited, spread and levelled in layers not exceeding 15cm thick, watered and rammed to a true surface of transformer and two pole / four pole structure complete all as specified and as directed.

M&L for surface excavation over the areas around the poles/feeder piller boxes/ sub stations not exceeding 15cm depth including cleaning the bushes and vegetation and leveling incl removal of surplus soil in soft/hard dense soil complete all as specified and as directed. Note :- Item can be repeated on the same location after 03 months.

Supply and fixing of Tinned copper Fuse wire off size complete all as specified and as directed.

Supply and fixing of PVC Electrical Insulation tape 25 RM length 1.8 cm width complete all as specified and as directed.

Supply and fixing in replacement of Insulation mat of 1 mtr width x 2 mtr length x 3 mm thickness (Voltage grade upto 33 KV) ISI marked IS 15652, CPRI approved of blue/black colour complete all as specified and as directed.

Supply and fix in replacement of HT 11 KV out door gang operated air break switch polymer type complete suitable for horizontal or vertical mounting fixed type, triple pole, mechanically operated, mounted on 09 insulators complete including steel frame, with operating mechanism worked from ground level for current rating upto 200 Amps, connected accessories required such as Lugs, jumpers, nut bolts washers etc and taking down old un-serviceable one complete and shifted to MES Store yard for further disposal complete all as specified and as directed.

Material and labour for jumper connections between GOD and drop out fuses and transformer with ACSR conductor 6/3.35mm (rabbit) 2 to 3.5 meter long including necessary lugs where ever required all as directed after removing the old jumper connection complete all as specified and as directed.

Repairing/servicing /overhauling of gang operated device 11000 volts, 200/400 Amps including greasing all the moving parts and applying white petroleum jelly at the contact points tightening all jointing/bolts nuts including replacing wornout the bolt and nutscommissioning and testing including dismantling and replacing the unserviceable parts/spares all as directed.Note: all the spares replaced will be measured & paid separately (labour cost for replacement of spares not covered berein below is also deemed included in the above quoted rate complete all as specified and as directed.

Supply and fixing in replacement of the following spares for replaceing in reapirs/servicing of GOD's complete all as specified and as directed.

Moving contact blades

Fixed contact jaw copper

Copper branded tape(thinner copper flexible jumper)

Back connected plate

Jumper carrier

PG clamps of suitable size as per site requirement.

Supply and Fixing Cross Arms, Bracings, supports, clamps and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as inclusive of one primer coat. One under coat and one finishing coat of paint incuding dismantling and taking out existing unserviceable compete all as specified and as directed.

Material and labour in replacement of stay assembly complete of 300 x 300x 6mm thick galvanised stay plate, stay rod of size 20mm including 7 strands of 3.15 mm stay wire with loop insulator complete all as shown in electronic plate No 1 of SSR Part I including dismantling old stay wire assembly complete all as specified and as directed.

Supply and Fix Lightening Arrester expulsion type complete with all fittings, 10KA, with all fittings,transmission class,max discharge capacity 65 KA suitable for 11 KV incuding dismantling and taking out existing unserviceable one compete all as specified and as directed.

Supply and Fix in replacement HT Disc type insulator, porcelain, vitreous 145mm high and 255 mm dia ball and socket type, brown single disc assembly for tension with testing clamps for conductors, working pressure 11000 volts grade complete after taking out old unserviceable insulator complete all as specified and as directed.

Dismantling and removing the unserviceable 11KV expulsion fuse single pole carefully from 2/4 pole structure and S/F Expulsion fuse (DO) single pole along with post top insulator suitable for single pole 6600 volts, 100 Amps capacity including connecting the same to the supply with necessary fixing materials such as aluminium jumpers,binding wire etc. complete all as specified and as directed.

S&F in replacement of XLPE insulated screened,PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor, 11000 volts grade,earthed , cross sectional area 95 Sqmm, 3 core HT under ground cable complete all as specified and as directed.

S&F in replacement of XLPE insulated screened,PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor, 11000 volts grade,earthed , cross sectional area 95 Sqmm, Single core HT under ground cable complete all as specified and as directed.

Excavation in trenches not exceeding 1.5m wide and not exceeding 1.5m depth and getting in hard/dense soil for laying of cables/ for erection of poles/ for stay assembly etc complete all as specified and as directed.

All as Item No 56 above but exceeding 1.5m depth -ditto-

Supply and spread clean dry river sand in trenches for cushioning of cable complete all as specified and as directed. Note: Punned down thickness only shall be measured for the purpose of payment

Supplying and laying un-reinforced precast concrete cable cover, Class HV, Type I, flat, size 300 mm x 180mm x 40mm for protection of under ground cables complete all as specified and as directed.

Returning, filling in trenches including spreading, levelling, watering and well ramming in layers not exceeding 25cm complete all as specified and as directed.

Removing surplus excavated material 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 as directed.

Material and labour for 80 mm dia bore tubes, 'light grade' galvanised, with all fitting and fixed complete to walls/ poles or laid in trenches/ floors for cable protection incl taking down complete all as specified and as directed. Make: Jindal / TATA / Zenith

Boring/ drilling (horizontally ) of holes under road, pavement, hard standing by trenchless technology suitable for passing GI / HDPE pipe 100mm dia complete all as specified and as directed.

M&L cable jointing Kit in replacement for 11KV grade cable for end box indoor heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 50 Sqmm to 95 Sqmm complete all as specified and as directed.

M&L cable jointing Kit in replacement for 11KV grade cable for end box indoor heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 120 Sqmm to 185 Sqmm complete all as specified and as directed.

M&L cable jointing Kit in replacement for 11KV grade cable for outdoor termination, heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 50 Sqmm to 95 Sqmm complete all as specified and as directed.

M&L cable jointing Kit in repairs for 11KV grade cable for outdoor termination, heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 120 Sqmm to 185 Sqmm complete all as specified and as directed.

M&L cable jointing Kit for 11KV(Earthed) grade cable for straight through heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 120 Sqmm to 185 Sqmm complete all as specified and as directed.

M&L cable jointing Kit for 11KV (Earthed) grade cable for straight through heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminum conductor cable of size 50 Sqmm to 95 Sqmm complete all as specified and as directed.

S&F steel tubular electric pole, swaged type, welded (11 metre long 410 SP - 55) complete with CI base plate, bolts, nuts & screws all as specified including-painting of pole externally with one coats of black bituminous paint (upto planting depth) and above plinth block/ concrete collar with two coats of aluminium paint over a coat of red oxide primer including preparation of surfaces including painting of 30 cm wide blue bands 3 Nos with synthetic enamel paint in alternate layers upto the height of 1.5 Mtr above plinth block and taking down the old damaged pole complete all as specified and as directed.

Checking / identifying the faulty precisely pin point of HT (11KV) cable using cable fault locator machine of most advanced system with multilevel safety,quickely and rectify the defects with necessary excavation, removing of defective portion, adding essential size of cable in required length (Min 5 RM), meggering & re-storation of electric supply of HT external electric feeder complete all as specified and as directed for any length of cable (approx 1 Km) Note : (i) Cable fault locator machine with all T&P required for identifying the faulty point will be arrange by contractor which cost is included in unit rate. (ii) Straight through joint will be measured & paid seperately in the relevent item.

Material and labour for Plain Cement Concrete type C2 1:3:6 (using 40mm graded stone aggregate) in foundations, filling and mass concrete for all electrical structures complete all as specified and as directed.

Material and labour for Plain Cement Concrete type B1 1:2:4 as in coping of poles including necessary form work complete all as specified and as directed.

Dismantling of AAC or ACSR conductor complete all as specified and as directed.

Supply and fixing of Anti-climbing device; spikes type fabricated out of M.S. bars (round, square and flat) including nuts, bolts, washers and welding in two halves made to shape to suit the cross section of the pole complete all as specified and as directed.

Supply and fixing of 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, 25x20cm size complete all as specified and as directed.

Supply and fixing of indication board aluminium framed of showing complete HT network on AFS Hakimpet site with indication of feeder line and transformer feeding location with 3mm diffused LED lamp different colours for different feeders with suitable size mentioning of pocket wise details of 11 KV feeding (i.e layout of HT OH/UG cable, Transformer position & substation position) and operating each feeder and transformer of LED with knob & size of board not less than 4x3mtr including legend showing details complete all as specified and as directed. Note : contractor shall get approval of diagram and material of fabrication from Engr-in-charge. Contrcator shall do site survey and laise with E6 section for correctness of the diagram and dispaly of data before procurement. Size, colour and name details shall be get approval from Engr-in-charge before fixing at site.

Supply, installation, commissioning and testing HV junction box panel board of suitable shape and size as approved by GE for 3 phase 11000 volts AC, 50 Hz supply outdoor cubical type, dust and vermin proof, pedestal mounting type suitable for outdoor applications havong suitable shape / size canopy on top, made out of 3.15 mm thick MS sheet with using 25mm x 25mm x 5mm angle iron frame and supports, duly finished with powder coated using two coats of synthetic enamel paint of approved colour over a coat of red oxide primer all over steel surfaces complete including locking arrangement, earth work and PCC work for fixing panel legs and bus bar of aluminium conductor suitable shape and size for 3 phase rating of 800 Amps IP-65 protection complete all as specified and as directed.

Material and labour for testing for dielectric strength of the transformer oil to be carried out complete all as specified and directed by Engineer-in-Charge. Note : (a) Test results obtained shall be recorded & produced to the Engr-in-Charge. (b) Measuring equipments & T&P required shall be arranged by the contractor.

M&L for Earthing complete with galvanized steel earth plate electrode 600x600x6mm thick buried directly in ground earth pit not less than 2.25mtr deep below normal ground level with top edge of the plate not less than 1.5 mtr below ground level connected to galvanized iron or steel earth lead strip 32x6 mm size upto 7.5 mtr long in single length by mean of nut/bolt and washer of galvanized iron or steel as shown in electrical plate no 5 of SSR part I including necessary excavation in hard/dense soil and earth work GI pipe 20mm dia mediumj grade for watering and GI 15mm dia light grade pipe for protection of GI earth wire etc, PCC chamber with PCC cover in cement concrete 1:2:4 Type B1(20mm graded aggregate), funnel, wire mesh, charcoal dust, salt etc, connected to LT panel board as indicated including taking off old retreived materials and necessary earth work complete all as specified and as directed.

Supply, installation, testing and commissioning in repair of fresh casted maintenance free conductive concrete electrode having copper bonded MS rod of dia 17.2 mm of 3 mtr length in depth of 3000 mm by boring excavation and 80 mm dia of earth enhancing material (Marconite) conductive concrete and cement mixture connected to earth strip 32 x 6 mm by means of nuts, bolts, washers and check nuts complete and installation of 10 inch HDPE heavy duty pit cover .The unit rate shall also include earth work complete all as specified and as directed. Note : Earthing shall be tested as per SSR Part-I to the entire satisfaction of Enineer-in-charge. On testing after completion of earthing, if desired resistance not obtained the earthing will be redone by contractor at his own cost.

Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/ pipe or fixed to poles or any other indicated situation for loop earthing as required 32 X 6mm dia galvanised steel strip complete all as specified and as directed.

kaushikbrothers (BID ID -3128531)

Mavee Syndicate (BID ID -3122003)

M Laxmana Rao and Sons (BID ID -3130120)

M/S - KRUPA ELECTRICALS (BID ID -3118032)