REPAIR OR MAINTENANCE TO VCB , RMU, SERVO STABILZER AND EARTHING AT VARIOUS LOCATION AT HQ EAC (U) AF UNDER GE (I) AF SHILLONG

Amount

Repair / servicing to HT Switch gear having Ring Main Unit capacity 11 KV rating of capacity up to 630 A by replacing defective/wornout parts of screw, nut bolt , washer and spring to adjustment of gaps for smooth operation all as detailed below:- (a) Opening the metal enclosure and checking the external factors of moisture , dust and heat for protecting the switch gear and controll components (b) Cleaning of RMU with air blower and removing dust particals. (c) Cleaning of insulating places of RMU by using CTC/CRC/Thinner as required and recommended by the manufacturer. (d) Checking the Movable contact gap mechanism if gap exceeds the permissible limis, readjust as recommended. (e) Cleaning the main contacts to remove carbon or any other unwanted particals if visible. (f) Dismentling and cleaning the insulated surfaces with CTC and CRC. (g) Checking/repair replacement of all electrical wiring for electrical/manual operation of panel including measuring IR values. (h) Checking of all nuts/bolts, springs, levers, latches, connnectors etc and adjustments as required and recommended by the manufacturer. (j) Checking the SF6 (Sulfur hexafluride) gas /Oil/air level) for maintaining proper insulating switch gear system. (k) Checking the incoming and out going cable termination's insulation. (l) Checking of all moving Gear mechanism for proper functioning of RMU and adjustment as per manufacturer recommendations of protection and control of power ditribution system. (m) Checking the Circuit breaker working of overload and fault curreant interuption. , load break switch and earthinng switch and fuse switch (n) Checking the Load break switch working as isolate the faulty section of the network. (o) Checking Earthing switch for safe path for flow of electricity incase of earth fault.

Material and labour for primery injection test and secondery injection test include record the primery injection test as inject the multiple of the fault rated currunt of the breaker for measuring the tripping time. Secondery injection test as injects a ratio of fault rated current to measure how long take period to trip.

Suppy and Refilling the SF6 gas as per manufacrare recommendation and checking the leakage and insulated level after refilling all as specified and directed by Engr in Charge.

Repair and Replacement of shock absorber of door assy of RMU unit any type /capacity including servicing, dusting, cleaning , greasing , tighting the nut /bolt of moveable and unmovable parts of the complete encosure door, all as specified and directed.

Supply and fix in replacement of U/S CM CT 20/5 current rated primer current is 20Amp and secondery rated current is 5Amp , burden of current transformer is 1 VA suitable precision all as per site including testing and commissioning after fixing of CT and sample all as specified and directed by Engr in charge.

Supply and fix in replacement of U/S CM CT 50/5 current rated primer current is 50Amp and secondery rated current is 5Amp , burden of current transformer is 1 VA suitable precision all as per site including testing and commissioning after fixing of CT and sample all as specified and directed by Engr in charge.

Supply and fix in replacement of U/S CM CT 100/5 current rated primer current is 100Amp and secondery rated current is 5Amp , burden of current transformer is 1 VA suitable precision all as per site including testing and commissioning after fixing of CT and sample all as specified and directed by Engr in charge.

Servicing and repairing of LT Air Circuit Breaker by drawing out mechanically ACB from cabinet clearing entire parts greasing, oiling tightening of nuts/bolts and replacing following unserviceable spare parts and reassembling the same. complete all as specified and as directed (a) Supply only under voltage release coil 230 Volts (b) Supply only Shunt release coil 230 Volts (c) Supply only closing coil 230 Volts

Repair / servicing to HT pannel of having vacuum circuit breaker 11 KV rating of capacity current rating up to 800 A by replacing defective/wornout part, adjustment of gaps for smooth operation all as detailed below:- (a) Cleaning of VCB with air blower and removing dust particals (b) Cleaning of insulating places of VCB by using CTC/CRC/Thinner as required and recommended by the manufacturer. (c) Checking the acring contact gap of vaccum intrupter if gap exceeds the permissible limis, readjust as recommended (d) Cleaning the main contacts to remove carbon or any other unwanted particals if visible. (e) Dismentling and cleaning the insulated surfaces and arc barrier with CTC and CRC. (f) Checking/repair replacement of all electrical wiring for electrical/manual operation of panel including measuring IR values. (g) Checking of all nuts/bolts, springs, levers, latches, connnectors etc and adjustments as required and recommended by the manufacturer. (h) Recording IR values of CTs and PTs. (j) Cleaning of bus bar spout. (k) Checking of all moving parts for proper functioning of VCB and adjustment as per manufacturer recommendations.

Program the existing numerical relay any model and type for over load and earth fault settings with respect to trip settings of HT panels sub station or other sub stn in such a way that faults are arrested locally including arranging or cracking of existing password all as required for smooth functioning of the HT panels complete all as specified and directed.

Supply and fix in replacement of U/S relay any type and make with Numerical relay microprocesser based model including retrofiting to the existing panels and programming the relays for overlaod and earthfault setting with respect to trip settings of HT panels Sub station or other sub station insuch a way that fault are arrested locally the tip testing carry over suitable with 11KV sub station/other complete all as specified and directed.

Excavation in trenches not exc. 1.5 m wide not exc. 1.5 m in depth; for laying of cables not exc. 10 Sqm on plan and getting out , trimming sides, forming bottom surface to required level complete in hard/dense soil all as specified and as directed.

Excavating in trenches, not exceeding 1.5 mtr wide and exceeding 1.5 mtr in depth but not exceeding 3.0 mtr depth ; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc. not exceeding 10 sqm on plan and getting out soft/loose soil complete all as specified.

Returning, filling in, including spreading, levelling, watering and well ramming in layers n.exc. 25cm thick as in soils all as specified and as directed.

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

M&L for laying precast concrete cable covers, class HV, type 1, flat size 300mm x 180mm x 40mm complete all as specified and as directed.

M & L for dry sand cushioning to PVC under ground cable with screened and washed sand and punning to provide a required cover complete all as specified and directed. Note :- Thickness after punning shall be considered for payment.

Supply only ROUNDUP HERBICIDE CHEMICAL for grass killing agent in E/M Installation maintenance for all as specified and directed.

Supply and spread graded coarse aggreagate 20mm graded loose staking inside the chain fencing area of transformer.

Supply and spread graded coarse aggreagate 40mm graded loose staking inside the chain fencing area of transformer.

PCC 1:3:6 type C1 using 20mm graded stone aggregate for coping of poles/plinth blocks of HT poles etc including fair finishing the exposed surfaces even and smooth without using extra cement including necessary form work complete all as specified and as directed.

Taking down existing 11 KV grade cable and providing new XLPE insulated, screened, bedded galvanised steel strip/wire armoured heavy duty with aluminium conductor of cross sectional area 120 Sqmm 3 core with cable protection works (as aplicable) laid in trenches/ducts/fixed on pole/wall/laid under road /path/culvert/drains/encased in pipe, including necessary lugs,joiniting and tesing complete all as specified and directed.

All as per item No 22 in above but 95 Sqmm x 3.core all as speicified

Supply and fix as in replacement MCCB, adjustable type thermal magnetic release type,4 poles, 415 Volts, Ics = 100% Icu, Lcu = 36 KA breaking capacity, rating 250 Amps including all fixing accessories with both ends spreader links Note: (a) Quoted rates shall be deemed for brick wall / concrete wall cutting and making good as per existing surfaces.

Supply and fix as in replacement MCCB, adjustable type thermal magnetic release type,4 poles, 415 Volts, Ics = 100% Icu, Lcu = 36 KA breaking capacity, rating 400 Amps including all fixing accessories with both ends spreader links Note: (a) Quoted rates shall be deemed for brick wall / concrete wall cutting and making good as per existing surfaces.

Supply and fix as in replacement MCCB, adjustable type thermal magnetic release type,4 poles, 415 Volts, Ics = 100% Icu, Lcu = 50 KA breaking capacity, rating 600 Amps including all fixing accessories with both ends spreader links Note: (a) Quoted rates shall be deemed for brick wall / concrete wall cutting and making good as per existing surfaces.

Supply & Fix in repairs ACB 630 Amps 45 KA 3 Pole, Manual draw out type with microprocessor release Ics = 100% Icu, Icu = 45 KA, Icw = 45KA for 1.0 Sec ,415 Volt, 50 Hz all as per exsisting size and make of C & S cat No AH-6D-CS including connecting up incoming/ out going cables/ Aluminium strip with suitable lugs or making hole suitably and testing including any modification if required to LT panel for installing the unit properly after taking out the old unserviceable one from LT panel board without damaging any other components complete all as specfied and as directed. Make-C&S (Cat No AH-6D-CS) or Techno commercially equivalent of Schneider/ L & T.

Material and Labour for enemal sticker SM number / Alphabets of Transformer/VCB/RMU/ change over switch 5 to 15 nos leeter is one sticker size is up to 50cm lenth 10 to 20 cm width all as specified and directed.

Material and labour for detection of any type of fault in HT underground Line of any size and core. (laid in soil at plane area or forest area) with the help of HT Meggar. Seggregation of faulty span by meggering and making span serviceable by repair of cable or replacement of cable. Note : Item No 25&26 1. Detection of one fault in faulty span will be measured as Each Job. 2. Earth work and taking out will be measured seperately. 3. Material for repair and replacement will be measured saperately.

M & L for detection /localisation of fault in HT 11 KV UG cable of any size and length , by means of cable fault locator including pinpointing the exact location of fault retrieving the exposing damaged portion carefully for further inspection and repairs complete all as specified and as directed by Engr - in - charge Note :- (i) Charges of cable fault equipment carried out by BESCOM/other agencies are deemed to be included in the item rate quoted (ii) Contractor on demand by dept has to arrange the above equipment without any delay failing which penalty will be levied by the dept. (iii) Excavation earth work measured and paid separately for cable fault detection.

Disconnect the cable cannection Repair / servicing to servo voltage stabilizer having capacity 200 KVA rating of capacity checking and servicing the following all as detailed below:- (a) servicing , cleeaning soft brush or compressed air to remove anybuildup, pay close attetion to the cooling fins and ventilation openings to proper air flow, check iput and out connections, and callibrating the stabilizer as recommended by manufacturer, checking the oil level and dieelectric strength of oil including oil viscosity with suitable equipment, value need to be maintain above 40KV other wise maintain dyhyderating the oil to get the value as required. Check and servic the coolig complete system including painting two coat oiul emusion paint after cleaning and scrubbing surface of stabilizer body outer area. testing and commissioning servo voltage stabilizer on load after complettion the all connected work, all as specifed and directed by Engr in Charge.

M & L for earthing complete with galvanized steel earth plate 60 cm X 60 cm X 6 mm thick buried vertically in ground to depth not less than 2.25 metres deep below ground level, with top edge of earth plate not less than 1.5 m below ground level, connected to galvanized iron strip 32x6mm earth lead by means of bolts, nuts, check nuts and washers of galvanized iron or steel besides welding at all joints as shown in drawing and including excavation and earth work, GI pipe light grade 40mm bore for protection of earth wire and connected to continous earth lead on pole/test point, supplying and laying charcoal dust common salt PCC 1:2:4 type B1, chamber and MS angle iron frame 40x40x3mm and RCC cover 40mm thick (1:2:4) type B1 using 20mm graded stone aggregate reinforced with 6mm dia round bars @ 75mm C/C both ways with MS handle 12mm dia, PGI/CI funnel and wire mesh, 20mm dia GI pipe medium grade for watering all as shown in electrical plate No 5 on srl page No 497 of SSR Part I (2009) drawing and connection to earth test point including testing and including dismantling and taking out old earthing complete all as specified and directed. Note : (i) The cost of earth lead /strip and GI pipe for protection of earth lead/strip upto 7.5m is included in the quoted rate. (ii) The cost of excavation, earth work is included in the quoted rate. (iii) The ohmic value shall no be more than 03 ohm. (iv) If the resistivity of the soil not achieved the required ohmic value as per above. The Contractor shall arranged further grids to achieve necessary ohmic value. No extra payment shall be made for additional grids and for testing of soil for getting the ohmic value. (d) During payment of RAR/ Final Bill the contractor shall submit necessary report of ohmic value for each location duly signied by Contractor, JE and Engineer-In-Charge.

Supply, installation of maintenance free Chemical Earthing system with 76.2 mm diameter x 3mtrs. long Earth electrode,hot dip galvanized 80-100 micron zinc. coated ,pipe filled with molecularly bonded crystalline conductive material in order to prevent the pipe from inner corrosion. The inner strip must be of size 25mm x3mm and the connecting outer terminal must be of size 50mm x6 mm. 6-8 inches dma bore must be made up to 10.5 feet depth. The pipe should be placed on the center of the Earth pit and the pit sorroundings must be filled with Electrolyte/Conductolyte compound at least 75 kg.The compound should be filled with necessary processing as advised by company representative. In case where soil resistivity is high additional loops may be made by adding more number of electrodes to achieve the required result and the same shall be paid including this item. The connections must well be made with hot dip galvanized 80-100 micron Earth Strip as per required sizes for various devices as specified.The Strip at ground level should be covered with heat shrink PVC Sleeve and the wiring must be insulated by providing DMC insulator and GI saddle.The joining of strips should have at least two nut bolts and the same should be welded properly so that no free space exhists on joints.Each joint should be oiled and painted to prevent corrosion. The Earth pits should be covered with Pit Cover of size1.5 ft dia x1.5 foot length and must be Mason worked with brick and cement to hold the pit cover firmly. Each connecting points for devices should possess Earth bar of size 300 x300 made of copper 6 terminal box type which should possess insulation.In case where proper clayaee soil is not available then a pit of dia 1.5 mtrs must be dug. Before Earthing installation of electrodes necessary processing must made for soil treatment as guided by company representatives. Note: (a) The ohmic value shall no be more than 01 ohm. (b) If the resistivity of the soil not achieved the required ohmic value as per above. The Contractor shall filled with fresh soil from outside with such restivity to achieve such ohmic value. No extra payment shall be made for pouring outside soil, testing of soil for getting restivity and necessay soil shall be paid and measured including this item. (c) Additional BFC required to achieve the ohmic value shall be measured and paid including this item. No extra cost shall be made to the contractor. (d) During payment of RAR/ Final Bill the contractor shall submit necessary report of ohmic value for each location duly signied by Contractor, JE, Engineer-In-Charge and by the user representative.

Supply only chemical i.e. ground enhancing compound (GEC) in bag of 25 Kg BARON Back Fill Compound (Conductolite) each complete all as specified and directed.

Taking out old unserviceable 20mm bore GI watering pipe of earthing and S & F 20mm bore Galvanised steel tubing medium grade as watering pipe of earthing etc conforming to IS-1239 complete all as directed.

Taking out old unserviceable copper earth strip and M & L for Earth continuity conductor of 20x3mm copper strip 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 etc, complete all as directed.

Taking out old unserviceable galvanised iron earth strip and M & L for Earth continuity conductor of 32x6mm galvanised iron earth strip 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 etc, complete all as directed.

Taking out old unserviceable LDPE pipes and Supply and fixing low density polythelene pipes (LDPE) 40mm dia for insulation of earth strip from building at entry points complete all as directed.

Supply and pouring in earthpit water solution made with common commercial salt in ration of 1:3 (1 part salt and 3 part water) around the earth electrode complete all as directed. (Note : Weight of common commercial salt only shall be measured & paid under this item)

Supply and filling in existing earthpits by charcoal and common commercial salt in alternate layer around the earth plate electrode all as shown IN electrical plate No. 3 on page 497 of SSR Part-I complete all as directed.

Supply and filling in existing earthpits by magnesium sulphate powder around the earth electrode complete all as directed. (Note for item Nos 40.00 to 42.00 : Excavation & earth work required for these items shall be measured & paid separately under respective items of this Schedule).

Taking out old unserviceable porcelain ceramic insulator and Supply and fixing white porcelain ceramic insulator with nut, bolt and washers for fixing earthing strip on wall/ceiling/roof all as directed.

Demolition of existing cement concrete earth pit chamber including RCC earth pit covers and constructing new earth pit chamber in PCC 1:2:4 type B-1 and RCC earth pit cover 50mm thick (1:2:4) type B1 using 20mm graded stone aggregate reinforced with 6mm dia round bars @ 75mm C/C both ways and edges of cover continuously protected with MS angle iron frame 40x40x3mm including provision of MS handle 12mm dia, PGI /CI funnel and wire mesh connected to watering pipe all as shown in electrical plate No 3 on srl page No 497 of SSR Part I (2009) complete all as specified and directed. Note : (i) Cost of formwork for earth pit chamber and cover, reinforcement of cover & PGI /CI funnel and wire mesh shall be deemed included in the quoted rate. (ii) Net volume of concrete shall only be measured and paid.

S & F in repairs solid copper lightening arrester of size 14mm dia, 1.2 metre long, with solid ball having four multi point spikes with heavy duty base plate complete all as specified and directed.

S & F in repairs Test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25mm long hex. head screw complete all as specified and directed.

Taking out old unserviceable PVC insulated & PVC Round Sheathed 2 core 1.5 Sqmm cable from any situation and Supply and fix/lay PVC insulated and FRLS PVC Round Sheathed, 2 core 1.5 Sqmm cable Copper Conductor (flexible) industrial cable, 1100 Volt, conforming to IS 694 for passing through conduit/through floor or through false ceiling complete all as specified and directed.

MAHINDER ELECTRICALS (BID ID -3405169)