REPAIR/ MAINT OF HT INSTALLATIONS, HT VCBS, HT CABLES AND DISTRIBUTION TRANSFORMERS AT LEBONG UNDER AGE(I) DARJEELING

Amount

Excavation in trenches exceeding 1.5 metre wide and exceeding 1.5 metre deep for laying cable and getting out in soft/loose soil complete all as specified and directed.

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

Removing excavated material from site to a distance not exceeding 50 metre and depositing where directed at a level not exceeding 1.5 metre from the starting point complete all as specified.

M&L for sand cushioning for protection of underground cable consolidated and compacted with clean dry sand complete all as specified and as directed

Supply and laying reinforced precast concrete cable cover, class HVP, type-1 flat size (300x180x40) mm for cable protection including taking out old damaged cover complete all as specified and as directed.

S&F GI Pipe light grade of 80 mm bore for cable protections laid in trenches/ structures/ walls etc. including necessary MS clamp, bolts, nuts, fastener etc after taking out the old rusted pipe complete all as specified and as directed.

Dismantling of old ACSR conductor from the disturbed span including line spacer and unserviceable material and depositing to MES store yard for further use as directed.

Dismantling of old earth wire or copper conductor, service feeder or distributor span etc and removing unserviceable material from site of work complete all as specified and as directed.

Dismantling of old unserviceable/defective (Pin type, Shackle type) insulators of any size/type and removing materials from site of work complete all as specified and as directed.

Dismantling and taking down mild steel cross arms, MS channels, angles, clamps from pole structure and depositing to MES store yard for further use as directed.

Supply, laying and testing cable XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cable (heavy duty) 11000 volts grade with stranded aluminium conductor conforming to IS: 7098 (Part-II) of size 95 sqmm 3 core complete all as specified and as directed.

Supply, laying and testing cable XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cable (heavy duty) 11000 volts grade with stranded aluminium conductor conforming to IS: 7098 (Part-II) of size 70 sqmm 3 core complete all as specified and as directed.

S&F cable jointing kit for 11 KV (earthed) grade cable for outdoor termination heat shrinkable type joint complete with jointing materials and accessories suitable for 3 Core XLPE armoured aluminium conductor cable for size 50/70/95 Sqmm after cutting out the faulty joint complete all as specified and as directed.

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

M & L 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 indicated or directed and inclusive of one primer coat, one under coat and one finishing coat of aluminium paint, complete all as specified and as directed.

Fixing only in repair steel tubular swaged poles type 410-SP-55 (11 m long) with cast iron base plate final taper plug, cap, mild steel bolts, nuts & screws complete all as specified and as directed. (Note : Steel tubular pole will be issued under Sch 'B' as free for fixing)

M & L plain cement concrete 1:3:6 type C-2 (using 40mm graded stone aggregate) as in foundation of poles, stays assembly etc. including necessary formwork complete all as specified and as directed.

M&L Providing cement concrete 1:2:4 type B-1 (using 20mm graded crushed stone aggregate) as in coping of poles and the like etc including necessary formwork complete all as specified and as directed.

Supply, install, testing and commissioning switch air break, gang operated triple pole, mechanically operated, mounted on 12 nos insulators and steel frame with operating mechanism worked from ground level with drop out fuse (set of three) for current rating up to 400A for working pressure 11000 volts including taking out old one complete all as specified and as directed.

Servicing / calibration / trouble shooting / repairing / adjustment of over current relay, earth fault relay, Spring, spring charge mechanism, close coil, trip coil, including connected accessories cleaning of all contacts with CTC, of the 11KV HT VCB panel of 630A, 50 Hz by qualified technical personnel to make functional in all respects including identifying the defective parts.

Supply only following spares in repairs suitable for 11KV HT VCB of maximum short circuit current rating 25/26.3 KA 630A/400A after taking down the old spares- (Note : Srl No. 21.00 is here by continued as Srl No. 21.01 to 21.28)

a) LED indicating lamps R/Y/B

b) LED indicating lamps amber

c) LED indicating lamps white

d) Trip circuit push button with NO contracts.

e) Limit switch

f) ZZ, micro switch

g) Big gear assembly

h) Small gear assembly

j) Tripping shaft assembly

k) Closing shaft assembly

l) Segment gear

m) PT fuse

n) Closing coil assembly 110V DC

p) Tripping coil assembly 110V DC

q) 7NO + 7NC auxiliary switch

r) space heater

s) Thermostat

t) HRC control fuse 2A, 4A, 6A 10A

u) Holding catch assembly

v) breaker controller

w) ON/OFF push button plate assembly

x) Breeze rectifier

y) Fuse base with carrier

z) Test & service switch

(aa) Spring Charging Motor 230V AC

(ab) CT (Epoxy type) ratio 100/5A

(ac) Vacuum interrupter for 400A, 11KV VCB

(ad) 3 phase OC EF relay high set IDMT and INST Aux supply 20-110 V DC rated volt 250V AC /110V DC

M & L for disc type insulator, porcelain, vitreous 145mm high and 255mm dia ball and socket type, white, brown or green single disc for tension with tension clamps for conductors, working pressure 11000 volts

Earthing complete with galvanized steel earth plate electrode 600x600x6 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.5 m below normal ground level connected to galvanized earth strip 32 x 6 mm (up to 7.5 m in length from earth plate ) by means of bolts and nuts check nuts and washers of galvanized iron or steel all as specified and shown in electrical plate no 3 of SSR part I including necessary excavation and earth work in any type of soil PCC 1:3:6 type C1 chamber with RCC 1:2:4 type B1 40 mm thick cover with MS rod 8mm dia 150mm long reinforcement, watering funnel, 40 mm dia light grade for protection of earth electrode 20 mm dia for watering all as specified and directed and tested on completion.

Disconnecting and removing transformer from mounting platform/structure after disconnecting HT/LT side cable connections, draining out transformer oil for repair/periodical maint of transformer of following capacity all as directed by Engr - in- Charge. (Note : Srl No. 24.00 is here by continued as Srl No. 24.01 to 24.04)

(a) 50 KVA to 100 KVA

(b) 150 KVA to 200 KVA

(c) 250 KVA to 350 KVA

(d) 400 KVA to 500 KVA

Disconnecting and removing transformer from mounting platform after disconnecting HT/LT side cable connections and transporting of unserviceable transformer for rewinding from MES sub station to contractors/civil workshop and vice versa by arrangement of necessary crane for taking down loading / unloading and refixing at site of following capacity :- (Note : Srl No. 25.00 is here by continued as Srl No. 25.01 to 25.02)

(a) 50 KVA to 100 KVA

(b) 150 KVA to 200 KVA

Opening the top cover lid and taking out the core with winding by means of Crane/Chain Pulley without any damage to core and winding after disconnecting all internal connection of coil with outgoing/incoming terminals and keeping aside for periodical maint such as cleaning of transformer core and winding, cleaning of oil tank, repair/replacement of unserviceable /Burnt parts of following capacity all as directed by Engr -in-Charge. (Note : Srl No. 26.00 is here by continued as Srl No. 26.01 to 26.04)

(a) 50 KVA to 100 KVA

(b) 150 KVA to 200 KVA

(c) 250 KVA to 300 KVA

(d) 400 KVA to 500 KVA

Periodical maint of transformer such as cleaning of core and winding by means of washing by hosing down with clean dry oil to remove dust/sludge on core and coil, including cleaning of oil tank to remove sludge deposit, replacement of rusted gasket set, burnt spindle, broken/unserviceable HT and LT ceramic bushing , broken arc horn surge arrester, replacement of silica gel for transformer of following capacity all as directed by Engr-in-Charge. (Note : Srl No. 27.00 is here by continued as Srl No. 27.01 to 27.05)

(a) 50 KVA to 100 KVA

(b) 150 KVA to 200 KVA

(c) 250 KVA to 300 KVA

(d) 400 KVA to 500 KVA

Note : (i) Cost of Transformer oil for cleaning by hosing down shall be deemed included in the rate quoted. (ii) Gasket set, LT/HT side ceramic bushing, spindle for HT/LT side and arc horn surge arrester for replacement shall be measured and paid under relevant item

Re - fixing of transformer core and windings by means of Crane/Chain Pulley without any damage to core/windings including re-filling/ topping up dehydrated new transformer oil after carrying out the maintenance/repair and making internal connection on LT/HT side and re-fixing of top lid cover, installing on mounting platform, making connections with HT/LT feeder and testing on load for transformer of following capacity all as directed by Engr-in-Charge. (Note : Srl No. 28.00 is here by continued as Srl No. 28.01 to 28.05)

(a) 50 KVA to 100 KVA

(b) 150 KVA to 200 KVA

(c) 250 KVA to 300 KVA

(d) 400 KVA to 500 KVA

Note :- New transformer oil for topping up shall be measured and paid under relevant item. The dielectric strength of the same shall be tested by contractor before filling in transformer.

Rewinding of transformer of under mentioned capacities by super enamelled copper wire as per existing gauge of primary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current all as specified and directed by Engr-in-Charge. (Note : Srl No. 29.00 is here by continued as Srl No. 29.01 to 29.02)

Rewinding of transformer of under mentioned capacities by super enamelled copper wire as per existing gauge of secondary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current all as specified and directed by Engr-in-Charge:- (Note : Srl No. 30.00 is here by continued as Srl No. 30.01 to 30.02)

Supply only brass spindle for terminal on HT side threaded complete with nut, washers etc of suitable dia for transformer of following capacity :- (Note : Srl No. 31.00 is here by continued as Srl No. 31.01 to 31.03)

(a) 63 KVA to 100 KVA

(b) 150 KVA to 250 KVA

(c) 300 KVA to 400 KVA

All as per item No 31.00 here-in-before but for LT side of transformer of following capacity :- (Note : Srl No. 32.00 is here by continued as Srl No. 32.01 to 32.03)

(a) 50 KVA to 100KVA

(b) 150 KVA to 250 KVA

(c) 300 KVA to 400 KVA

Supply only ceramic bushing on LT side of transformer of following capacities. (Note : Srl No. 33.00 is here by continued as Srl No. 33.01 to 33.03)

All as per item No 33.00 here-in-before but for HT side of transformer of following capacity :- (Note : Srl No. 34.00 is here by continued as Srl No. 34.01 to 34.03)

Supply only gasket set for transformer top lid cover, LT and HT terminal bushing suitable for transformer of following capacity :- (Note : Srl No. 35.00 is here by continued as Srl No. 35.01 to 35.04)

(a) 50 KVA to 100KVA

(b) 150 KVA to 200 KVA

(c) 250 KVA to 300 KVA

(d) 400KVA to 500 KVA

Dehydration/filtration of transformer oil by means of centrifugal filtration plant to achieve the specified dielectric strength of 35 to 40 KV at 2 mm gap in existing possession of transformer of any capacity and transformer oil for topping up at various sub-station all as directed by Engr-in-Charge.

Supply only transformer oil of approved quality having dielectric strength not less than 60 KV, tested in 4.0mm gap, IS marked (Make: Savita/Poweroil) for filling in transformer for topping up all as directed by Engr-in-Charge.

Cleaning of 11KV main receiving station and (Main Power House area) and substations by removing unwanted grass/cutting bushes or any unwanted materials all as directed by Eng-in-Charge.

S&F in repair wall mounted bus bar chamber three phase and neutral 415 volt AC chromium plated copper strip 200 Amp current rating mounted on insulators of 1100 volt grade having facility of one incoming and five outgoing cable complete all as specified and as directed. (Cat Part No. IHBC020006 of Make Havells or equivalent model of L&T/ Legrand)

S&F in repair MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 25 KA of rating 160A with sheet metal enclosure incl electric connection complete all as specified & as directed. (Cat Part No. 4200 57 & 5078 01 of Legrand or equivalent model of L&T/ Siemens )

S&F in repair MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 16 KA of rating 100A with sheet metal enclosure incl electric connection complete all as specified & as directed. (Cat Part No. 4200 15 & 5078 01 of Legrand or equivalent model of L&T/ Siemens )

M&L loose filling with aggregate with un-broken stone or boulders of gauge 40 to 80mm complete all as specified and as directed

Taking out old LT panel after disconnecting all connections, MCCBs, Change over switch etc including taking out all cables without disturbing other existing distribution system complete all as specified and as directed.

Supply, install, testing & commissioning of LT panel board "in-door type" of size 3000 mm x 1800 mm x 600 mm (minimum dimensions) factory fabricated (CPRI type tested) with suitable neoprene rubber gasket to make it completely dust & vermin proof & degree of protection not less than IP-43 & general construction confirming to IS-13947, single door, front & back hinged opening. The panel shall be provided with ventilation facility in the form of louvers for better heat dissipation & tinned copper bus-bar wrapped with coloured PVC tape/sleeves of rating in conformity to the Incoming MCCB rating. The panel board shall be fabricated out of 2.0 mm thick CRCA sheet duly painted externally and internally with powder coating paint (RAL-7032) after necessary surface preparation with, supporting frame made out of 60 x 60 x 6 mm angle iron & MC 100 channel base suitable for 3 Ph, 4 wire system 415/440 volts grade incl complete internal wiring with not less than 2.5 sqmm copper wire incl cable glands of suitable sizes complete all as specified & as directed with & incl the following accessories : (Note : Srl No. 44.00 is here by continued as Srl No. 44.01 to 44.03)

BUS-BAR & INTERNAL CONNECTIONS : The bus-bars shall be made up of 04 Nos Tin plated electrolytic copper strip bus bar 600A rated, duly insulated with 1100 V grade standard colour coded PVC sleeves & rigidly mounted on suitable sized "F" class DMC/ epoxy type insulators of non-hygroscopic, non-combustible, all internal connections from main bus-bars to switch gears etc. PROVISION FOR CABLE ENTRY : The provision for cable entry/exit shall be provided in the bottom for both incoming & out-going cables. INCOMING : Fixing only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 36 KA of rating 400 A incl electric connection complete. - 01 No OUTGOINGS : (a) Fixing only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 35 KA of rating 250 A incl electric connection complete - 02 Nos. (b) Fixing only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 25 KA of rating 200 A incl electric connection complete - 05 Nos.

(c) Fixing only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 25 KA of rating 100 A incl electric connection complete - 03 Nos. (d) Fixing only Onload changeover switch, open-execution modular construction type, confirming to IS/IEC 60947-3, rated current 200 A, 415 V, 4P - 02 Nos

Supply only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 36 KA of rating 400A incl electric connection complete all as specified & as directed. (Cat Part No. 4220 07 of Legrand or equivalent)

Supply only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 36 KA of rating 250A incl electric connection complete all as specified & as directed. (Cat Part No. 4202 49 of Legrand or equivalent)

Supply only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 25 KA of rating 200A incl electric connection complete all as specified & as directed. (Cat Part No. 4202 18 of Legrand or equivalent)

Supply only MCCB 4P (Ics = 100% Icu) with thermal magnetic release, adjustable short circuit & adjustable overload setting having breaking capacity 25 KA of rating 100A incl electric connection complete all as specified & as directed. (Cat Part No. 4200 55 of Legrand or equivalent)

Supply only change over switch 200 Amp, 4 Pole, 415 volt complete all as specified and as directed. (Cat Part No. CO22000OOOA of L&T or equivalent)

Note:- The contract sum shall be arrived at after deducting amount of schedule of credit from the total quoted amount.

Damdoo Bhutia

CHANDAN TRADERS

GEETA CONSTRUCTION

M/s Om Prakash Agarwala

R N SAH N CO