MAINTENANCE AND REPAIR TO HT 11 KV SUPPLY NETWORK AT 58 SU AFS CHIMNEY HILLS

Amount

Excavation in trenches not exceeding 1.5m wide and not exceeding 1.5m in depth and getting out in hard / dense soil for laying of cables, all as specified and directed.

Returning, filling in including spreading leveling, watering and well ramming in layers not exceeding 25cms in hard / dense soil, all as specified and directed

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

M&L spread dry Riddled soil in trenches for cable Cushioning, all as specified and as directed. Note : Punned thickness only will be measured and paid.

Supply, Laying and Testing XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavyduty) with aluminium conductor, 11000 volts Earthed, grade cross sectional area 3 Core, 95 Sqmm, all as specified and directed.

Supply, Laying and Testing XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavyduty) with aluminium conductor, 11000 volts Earthed, grade cross sectional area 3 core 185 Sqmm, all as specified and directed.

Material & Labour for cable jointing kit for 11KV (Earthed) grade cable for indoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Material & Labour for cable jointing kit for 11KV (Earthed) grade cable for indoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 185 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Material & Labour for cable jointing kit for 11KV (Earthed) grade cable for outdoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Material & Labour for cable jointing kit for 11KV (Earthed) grade cable for outdoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 185 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Supply, jointing and testing out door type HT cable end termination joint "straight through" heat shrinkable suitable for aluminum conductor XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, and over all PVC sheathed cable 11000 volts grade 3 core 95 sqmm nominal size all as directed.

Supply, jointing and testing out door type HT cable end termination joint "straight through" heat shrinkable suitable for aluminum conductor XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, and over all PVC sheathed cable 11000 volts grade 3 core 185 sqmm nominal size all as directed.

Material & Labour for un-reinforced precast concrete cable cover, class HV,Type 1, flat, size 300 mm x 180 mm x 40 mm laid over under ground cable for protection, all as specified and as directed.

Material & Labour for HDPE pipe, Class PN10, 150 mm dia in trenches for road crossing / laid in floors, all as specified and as directed..

Material & Labour for Dehydration and Filtering the transformer oil having the dielectric strength below 40KV and testing of transformer oil after filtration as per IS-335-1972 and removing the moisture contents in the transformer cores/winding as directed.

Material & Labour for Topping up or replacement of transformer oil with di-electric strength not less than 60 KV in to the conservator tank/ body tank of the transforme etc at various locations complete all as specified and as directed.

Material & Labour for lightning arresters for outdoor use expulsion type suitable for 11000 volts (HT) complete with all fittings, transmission class, discharge capacity 65 KA including taking down existing lightening arresters of any type and size complete all as specified and as directed.

Material & Labour for fixing barrel fuse including fuse element suitable for HT 11 KV drop out fuse carrier up to 15 Amp rating all as directed after dismantling the exisiting out lived fuse barrel complete all as specified and as directed.

Material & Labour for replacement of silica gel breather assembly for HT distribution transformers of 100 KVA to 250 KVA capacity including dismantling old one, all as specified and as directed

Material & Labour for replacement of silica gel breather assembly for HT distribution transformers of 400 KVA to 750 KVA capacity including dismantling old one, all as specified and as directed

Material & Labour for Cross arms,bracing bracet supports and back plate from structural steel sections including clamps,nut bolts washers welding,bending cold or hot drilling for bolts in any shape or size as indicated or directed and inclusive of one, primer coat and two coat of aluminium paint all as specified and directed.

Dismantling insulators of any type and size complete all as specified and as directed.

Material & Labour for pin type, porcelain vitreous, white, brown or green insulator including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut 150mm height, 150mm dia for 11000 volts grade all as specified and as directed.

Material & Labour for GOD / Switches air break ,Triple pole, mechanically operated, mounted on insulator and steel frame, with operating mechanism worked from ground level, for current rating upto 200 amps including dismantling old all as per directed.

Supply & Fix Danger notice plate of 1.6mm thick mild steel sheet & of size 25 x 20 cm, with vitreouse name lled with letter figures and conventional skull and bones insignal red colour and fixed with MS clamps, bolts and nuts of approved size for HT, all as specified and directed.

Material & Labour for Earth continuity conductor or main earthing lead 25 X4 mm galvanised iron, fixed to pole 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, all as specified and directed.

Material & Labour for replacement of the HT porcelain bushings complete of Transformer from 100 KVA to 315 KVA capacity distribution transformers of existing transformer make/ size/ type including dismantling old one, all as specified and as directed .

Material & Labour for replacement of the LT bushing rod made out of gun metal with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc. complete from 100 KVA to 160 KVA capacity distribution transformers of any make/ size/ type including dismantling old one, all as specified and as directed

Material & Labour for Repair / service / overhauling of gang operating devices 11000 volts upto 400 Amps including greasing all the moving parts and applying white petroleum jelly at the contact points, tightening all nuts and bolts and providing PG clamps, additional nut and bolts, commissioning and testing complete including dismantling and replacing all the unserviceable parts / spares all as specified and as directed. Note: Supply only of all the spares replaced shall be measured and paid separately.

Supply & Fix moving contact blades suitable for 11 KV, complete all as specified & directed. .

Supply & Fix contact jaw copper suitable for 11 KV, complete all as specified and directed.

Material & Labour for preparation of old painted surfaces of transformers with coarse cloth/ brush and painting throughout exposed steel surfaces with two coats of smoke grey colour synthetic enamel paint or approved colour as directed including writing of SM/MES Number on transformer and transformer details on plinth in white enamel paint on black enamel paint back ground, for 100 to 750 KVA capacity indoor / outdoor type transformer complete including one coat of white wash for base foundation, all as specified and directed.

Surface dressing in hard / dense soil not exceeding 15 cm deep and clearing all the grass weeds etc in the sub station yards after removing stone aggregate aside all as directed at site including setting / spreading back the aggregate complete all as specified and directed at site Note:- (i) Additional stone aggregate required shall be measured and paid separately under relevant items of this schedule. (ii) The rate also deemed to be included for labour (iii) All the sub station yards shall be kept clean through out the contract period by removing the grass/weeds as many as times required depending on the growth of the grass. (iv)The rates shall be deemed to includes clean the cost of removing two time the grass,weeds,debris,excess soil etc to a distance not less than 50 M and keeping the excavated surface clean and levelled all as directed..

Material & Labour for repairs to transformer at locations where installed after removing nuts and bolts of transformers of capacity 100 to 750 KVA and taking out the leaked portion such as bushes, joints and replace the gaskets after cleaning the suface and refixing the nuts & bolts and ensure no leakage all as specified and as directed. Note: (i) The quoted unit rate shall be included making necessary arragements to remove the oil in the conservator/ up to the level of the portion to be opened in safe drums and refilling after the repair works. (ii) The tranformer repair works shall be carried out only by engaging specialised and experianced technicans. (iii) The oil shall be filterd before refilling if found required. (iv) The charge for filteration will be measured and paid separately rate quoted shall deemed to be included the cost of spares such as cork sheet gasket, nut/bolts and washers.

Material & Labour for Disconnection & Removing the unserviceable aluminium conductor/jumper wires from the HT 4 Pole structure and provided new aluminium overhead conductor jumpers sorrounded by PVC insulation sleeves with R,Y& B color code complete all as directed. Note : (i) All the jumper wires should be replaced with New jumper wires (ii) Type of conductor used for jumper should be RABBIT. (iii) Cost deemed to be include for all the misc work such as nut,bolts, washers, welding etc. for satisfactory completion of job . (iv) Min clearance should be maintained among the conductors as per the Electricity Regulations. (v) Zero percent Sag should be maintained for each jumper wire to avoid short ckts.

Supply only the space heater as per existing one fitted in HT VCBs suitable for 400 to 800 Amps 250 MVA to 450 MVA HT switch gear (VCBs) and 11 KV HT panel, all as specified and directed.

Supply only the Trip Free Mechanism suitable for 400 to 800 Amps 250 MVA to 450 MVA HT switch gear (VCBs) and 11 KV HT panel, all as specified and directed.

Supply only the closing coil suitable for 400 to 800 Amps 250 MVA to 450 MVA HT switch gear (VCBs) and 11 KV HT, all as specified and directed.

S&F Self powererd Relay ADR241S for VCB i.e.Overcurrent, earth fault,under current, Thermal overload,Inrush blocking,Negative sequence, Broken conductor, auto reclose all as specified and directed .

Material & Labour for Transformer Rubberized rubber Gasket suitable for 100 to 250 KVA Indoor, oil coled Transformer, all as specified and directed.

Supply and spreading stone aggregate of size not exceeding 40mm spread and leveled in layers not exceeding 15 cm to a true surface of broken stones for transformer and pole structure area, all as specified & directed

Material & Labour for defect rectification in HT 11 KV cable laid in trenches by locating fault with the help of electronic fault locator machine comprising of surge generator pulse ECHP fault location with high frequency distance calculator etc, including excavation in any type of soil strata exposing the cable fault removal of deteriorated position of cable treating of cable and keeping the same ready for jointing work for cables of size upto 300 Sqmm 3 core, complete all as specified and as directed. Notes :- (i) The contractor shall bring the fault locating equipment at site with in 02 hours of instructions received from Engineer -in- charge and shall ensure that the fault is rectified with in 24 hours of receipt of intimation from Engineer-in-charge failing which recovery of Rs. 300.00 per hour shall be recovered from the contractors dues w.e.f the time immediately after the expiry of 24 hours duration.

(ii) For the purpose of payment one unit shall comprise of detection of faults in a particular stretch of cable which are identified in that particular stretch, irrespective of number of defects / faults in that particular stretch which are detected during fault detection and the contractors unit rate quoted shall be deemed to include for the same and all such defects / faults which are detected in that particular stretch shall be considered as one unit. (iii.) Joints, jointing materials and cable required shall be measured and paid for separately.

Material & Labour for disconnecting carefully electrical connection from both HT/ LT (primary & secondary) sides of the transformer, keeping them at safe side and taking out the transformer indoor/ outdoor type of capacity 100 KVA to 750KVA, 11 KV/ 0.433 KV, step down any make for carrying out complete overhauling which shall comprise of the following:- (a) Lifting, transporting, handling, the transformer to workshop and opening top cover of the transformer by unscrewing nuts, bolts, washers etc. including disconnecting core assembly from HT/ LT bushing and lifting the same gently and taking out from the shell (container/ body) of the transformer. (b) Draining out transformer oil from the transformer in the suitable capacity of container /drums and keeping it in safe custody for reuse.

(c) Cleaning the transformer body from inside, removing deposited dirt/ sludge/ foreign particles etc. from the bottom/ body of the transformer and drying up the shell from inside before refilling of the transformer oil. (d) Cleaning and washing thoroughly core and windings of the transformer by hosing down with clean dry oil conforming to IS 335/1983, removing deposited dirt/sludge/foreign particles from the windings/ core, thorough inspection of windings, providing insulations to leads and terminals, heating/ drying/ baking complete carefully and thoroughly inside the heating chamber at suitable temperature to obtain required value of insulation resistance etc. all as per IS 1986-87 and directed. (e) Lifting and refixing core assembly inside the transformer shell gently and carefully, connecting primary/ secondary/ Neutral connections to the bushings assembly, fixing of tap change over including tightening of nuts, bolts, washers of the core to reduce humming noise all as directed.

(f) Refilling the filtered transformer oil in the shell of transformer complete. (g) Refixing the top cover including replacement of cork sheet/ gasket 8mm thick, tightening of nuts/ bolts/ washers etc. and replacement of breather with silica gel crystal type all as directed. (h) Lifting/ shifting to the place from where removed and re-installing the transformer including connecting primary/ secondary/ neutral / earth connections etc. all as directed. (j) The inspection of transformer shall involve the followings :- (i) Checking of all clamps, nuts, bolts including core bolts & cover fixing bolts. (ii) Checking all brazings, joints, tap heads and connection joints. (iii) Checking all jumpers, terminations/ connections inside the transformer. (iv) Checking the Buchholtz relay/ conservator MOG if any.

(v) Painting of transformer complete with two coats of synthetic enamel paint externally transformer shell complete all as directed. (vi) Inspection of tap changer, checking the moving and fixed contacts for contact wear and connection to winding. Note:- (i) Any damage to insulators/ bushes/ windings etc. while in the custody of the contractor shall be made good at no extra cost to govt. (ii) The serviceability of the transformer shall be checked and confirmed by the contractor before taking into his custody. (ii) M&L for rewinding re-insulation of HT/ LT (primary/ secondary) coils, bushes, studs, Transformer oil,cable box, replacement of buchholtz relay/ MOG if any etc will be measured and paid separately.

Taking down HT switch gear (Vacuum circuit breaker ) of capacity 400 to 800 Amps, 11 KV 250 to 450 MVA and strip opening the HT panel of rating 11 KV, 3 phase comprising of following repairs, overhauling, servicing and refixing the same after repairs/ overhauling total unit :- (a) Dismantling and checking of cross bar assembly, fixed contacts and current carrying parts of the breaker, trolley, insulated assembly and checking lamination with clamps, epoxy spout, isolator assembly etc.

(b) Lubrication and greasing of all moving parts of the trolley, stopper bolt for proper operating and closing of shutter gear, isolation resistance of trolley of with vacuum interrupter assembly. (c) Dismantling the complete instrument chamber/ HV cable box/LV cable box. Decarbonising/ cleaning the complete HT 11 KV 3 phase independent bus bar, bus bar chamber of HT panel and inspecting the bus bar insulators. (d) Servicing/Inspecting/checking of circuit spout and cicuit spout connections for RYB phases and replacement of spares if required.

(e) The inspection of HT switch gear shall involve the follwings :- (i) Inspection of truck & hoist assembly. (ii) Inspection of tank assembly & barriers. (iii) Inspection of assembly & components of solenoid assembly. (iv) Inspection of assembly & components of dependent mechanism. (v) Inspection of assembly & components of spring box mechanism. (vi) Inspection of motor mechanism spring charge assembly (vii) Inspection of assembly of trip unit & related components

M/S SRI BALAJI ENTERPRISES (BID ID -3359392)

SRINIDHI DIESELS & ELECTRICALS (BID ID -3356207)

RAMESH BABU CO (BID ID -3365857)

Sri Lakshmi Enterprises (BID ID -3356253)

RAHUL ENTERPRISES (BID ID -3358895)