REPAIRS TO HT SWITCH GEARS / DEHYDRATION OF TRANSFORMER AND OTHER MISC WORKS AT AFA HYDERABAD

Amount

M&L for Testing of dielectric strength of transformer oil of indoor/outdoor type transformer, 11 KV / 433 volt, filteration of transformer oil by passing through filtration plant to remove moisture, improving di-electic strength to above 40 KV for 1 minute including new transformer oil for filling/ toping up & testing after filtration complete all as specified and as directed. (Note :- NewTransformer oil will be measured and paid separately under relavent Item of BOQ

M&L for toping / filling up / replacement of transformer oil with 50 KV di-electric strength complete all as specified and as directed.

M&L for replacement of Silica Gel breathers including silica gel, suitable for transformers 11 KV / 433 Volts of the following capacity :-

M & L for replacement of thermometer (oil temperature gauge) for indoor type transformer complete all as specified and as directed .

M&L for Disconnecting of LT and HT cable carefully from Transformer and draining out transformer oil, Removing transformer top cover and dismantling of 4 Nos LT bushing and 3 Nos of HT bushing,Tap changer to attending leakage problem with oil seal and all gaskets and replacing the burn out HT / LT bushing and copper Studs including necessary tools and plant and re assembling complete all as specified and as directed for the following capacity :- Note :- (i) Oil seal and all Gaskets are deemed to be including in coated rate. (ii) New Transformer oil ,HT,LT bushing and studs will be measured and paid separatley under relavant Item of BOQ.)

(b) 315 / 250 / 200 / 160 / 100 KVA / 400 KVA

Supply Only Bushing on HT Side with copper rod complete all as specified and as directed for following capacity transformers :-

Supply Only Copper stud with nut ,washers on HT Side complete all as specified and as directed for following capacity transformers :-

(b) 315 / 250 / 200 / 160 / 100 KVA/400 kva

Supply Only Bushing on LT Side alongwith copper rod complete all as specified and as directed for the following capacity transformers :-

Supply Only Copper stud with nut,washers on LT Side complete all as specified and as directed for following capacity transformers :-

Disconnecting the electric cable connections , taking out the voltage stablizer from its posotion at any sites situation with the help of suitable pully / crane and transporting the voltage stablizer to workshop for carrying out necessary repairs and bringing back and re-install in its original place, of capacity upto 75 KVA complete all as specified and as directed.

Supply and Fix plastic sleeve suitable for moving arm unit (male & female) type suitable for existing HT 11 KV breaker complete all as specified and as 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 of BOQ.

(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 swtich 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.

M&L for Repair / Overhauling existing indoor type, Load Break Switch / RMU, 11 KV, SF 6, Switch Gear Panel and carrying with following and including replacement of un serviceable / damaged spare parts complete all as specified and as directed. Note : - Spare parts will be measured and paid separately under relavant Item No

(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 and apply Multi grease (Stanvac) lubricant to function smoothly.

(ii) Inspecting / overhauling of assembly, earth fault release assembly, tripping coil, auxiliary switch and checking of electrical wiring system

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

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

(v) Overhauling/testing of Metering Panel including CT and PT

Supply Only spare parts of Ring Main Unit (RMU) , 11 KV , 630 Amps Make :- Schneider / ABB / Siemens complete all as specified and as directed for the following :-

(a) Plug -In type insulators with Current carrying parts and SF6 gasket seals.

(b) Static Relays,Self powered 3O / C + 1E / F

(c) Current Transformer,100 /1A ,15 VA burdn, class 1 accuracy for metering

(d) Current Transformer,250 /1A,15 VA burdn, class 1 accuracy for metering

(e) Current Transformer,250 / 1A,15 VA burdn, class 5p10 accuracy for protection

(f) PT Fuse ,11KV/110Volts

(g) Multi function meter, digital type

(h) ON / OFF push buttons

(j) Line Voltage Indicating Unit

(k) Terminal protection Right Angled cold applies Boot

(l) Potential transformer,11KV / 110 Volt / Rout 3,100 VA burden Trolly mounted with HRC Fuse

(m) Barrel Fuse 63 Amps

Supply Only spare parts of VCB,11 KV,630 Amps 18.3 kA / 25 kA Harizontal Isolation Harizontal drawout type Make :- Schneider / ABB / 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 24 Volt DC/110

(e) Tripping Coil assembly 24 Volt DC/110

(f) Spring Charging Motor

(g) Auxiliary Switch with link

(h) Spring return latch assembly

(j) Vaccum Interupter assembly

(k) Spout Insulators

(l) Potential transformer,11 KV / 110 Volt / Rout 3 ,100 VA burden Trolly mounted with HRC Fuse. Make :- Gemini Instratech / Ericon / Epitrans Electricals / Kappa / Pragati

(m) Current transformers,50 / 30,1+1 Amp s, Class1 and 5p10,15 VA Make :- Gemini Instratech / Ericon / Epitrans Electricals / Kappa / Pragati

(n) Current transformers,100 / 50 ,1+1 Amps, Class1 and 5p10 ,15 VA Make :- Gemini Instratech / Ericon / Epitrans Electricals / Kappa / Pragati

(o) TNC Switch

(p) Ammeter Digital type 96 mm x 96 mm

(q) Voltmeter Digital Type 96 mm x 96 mm

(r) Power Factor Meter Digital type 96 mm x 96 mm

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

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

(u) Relay Microprocessed based 3 O/C and 1 E/F Type MiCO M P111 Schnieder

(v) Relay Microprocessed based 3 O/C and 1 E/F Type MC61 L&T

(w) Master Trip Relay Type

Supplying and laying un-reinforced precast concrete cable covers , class HV Type I, flat, size 300 mm x 180 mm x 40 mm. laid in trenches for cable protection complete all as specified and as directed.

M&L disconnect the HT / LT connection taking out the transformer from its plinth at any situation with the help of suitable cran and transporting the transformer civil work shop for carring out necessary repairs and bringing back and re-install its original place of capacity upto 400 KVA. complete all as specified and as directed

Description all as per Ser Item No 18 above but Transformer Capacity is above 400 KVA to 1000 KVA complete all as specified and as directed

Material and labour for rewinding of HV winding with DPC insulated enamelled copper wire and as per manufacturer's specifications complete all as specified and as directed.

Material and labour for rewinding of LV winding with DPC insulated enamelled copper wire and as per manufacturer's specifications complete all as specified and as directed.

M&L for shifiting of distribution transformer (11 KV / 0.433 KV) of capacity 400 / 250 / 160 / 200/ 100 KVA from its existing location to its proposed location after taking necessary shut down, disconnection of HT / LT cables, earthing connections and including necessary loading / unloading charges and hire charges of hydraulic lifting machines and necessary connections to HT / LT cables, earthing connections etc.in new location complete all as specified and as directed.

M&L for Checking / repairing of outdoor non wall type 11 KV Package Compact Sub Station (PSS) (a) CT , (b) PT , (c) Relays and testing of of inter connection & earthing between HT Switch gears and LT switch gear with complete control wiring , over curret relay , earth fault relay , calibretation of all HT relays considering time delay and IDMT features by engaging well experince OEM/Reputed Company Rep for assessing the fault witih in the faulty circuit and rectified the same for smooth function of Compact Substataion with 1000 KVA transformer ,630 Amp HT switch gear /LBS and LT switch gear complete all as specified and as directed. Note :- Spare part will be measured and paid separetly.

(i) 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.

(ii) 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.

(iii) 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.

M&L for servicing and repairing of APFC Panel including checking and repairing of falulty ciricuit and rectify the same complete all as specified and as dircted

M&L for filling of SF- 6 gas as per Manufacturer specifications complete all as specified and as directed.

AKSHITA ELECTRICAL

Saiansh Associates

Srinivash Engineers

OM SAI POWER SYSTEMS