CWE/AF AMB/SAR-09/2023-24 SPECIAL REPAIR FOR CONVERSION OF HT 2/4 POLE STRUCTURE TO HT RMU AT CERTAIN LOCATION OF AF STN SARSAWA UNDER GE (AF) SARSAWA

Amount

Design, Supply, Erection, Testing and Commissioning of 11KV, 630Amp, Short time current rating 21kA for 3 seconds, SF6 insulated, Motorised, Outdoor, extensible both side RMU, type tested in line with latest IEC standards. The RMU shall be suitable for operations at a height upto 1000mtr above mean sea level and at 40 degree centigrade ambient temperature without any derating. The switchgear and busbar shall all be contained in a stainless steel enclosure filled with SF6 at 0.3 bar relative pressure. The RMU tank shall provide full insulation, making the switchgear insensitive to the environment with degrees of protection of IP67 . The switchgear operating mechanism shall have an IP2X protection and cable chamber shall have IP3X. The outer enclosure should be IP 54 type tested, should be powder coated with pure polyester based paint, suitable for the site installation conditions. Accidental over pressure due to an internal arc is limited by the opening of the safety valve, at the bottom of the metal enclosure, away from the operator. Plug in type of extensibility must be provided and coupling busbar should not be exposed to air to avoid oxidation of busbars. Extension of cubicle should only require 450mm to handle and the gap between the coupled RMU’s must be within 10mm. 11KV 630Amp 3 Way Ring Main Units (01 No. Load Break Switch for Incoming and 02 Nos. Vaccum Circuit Breaker for Outgoing)

Design, Supply, Erection, Testing and Commissioning of 11KV, 630Amp, Short time current rating 21kA for 3 seconds, SF6 insulated, Motorised, Outdoor, extensible both side RMU, type tested in line with latest IEC standards. The RMU shall be suitable for operations at a height upto 1000mtr above mean sea level and at 40 degree centigrade ambient temperature without any derating. The switchgear and busbar shall all be contained in a stainless steel enclosure filled with SF6 at 0.3 bar relative pressure. The RMU tank shall provide full insulation, making the switchgear insensitive to the environment with degrees of protection of IP67 . The switchgear operating mechanism shall have an IP2X protection and cable chamber shall have IP3X. The outer enclosure should be IP 54 type tested, should be powder coated with pure polyester based paint, suitable for the site installation conditions. Accidental over pressure due to an internal arc is limited by the opening of the safety valve, at the bottom of the metal enclosure, away from the operator. Plug in type of extensibility must be provided and coupling busbar should not be exposed to air to avoid oxidation of busbars. Extension of cubicle should only require 450mm to handle and the gap between the coupled RMU’s must be within 10mm. 11KV 630Amp 3 Way Ring Main Units (02 Nos. Load Break Switch for Incoming with interlocking and 01 No. Vaccum Circuit Breaker for Outgoing)

Notes for BOQ item No. 1.00 & 2.00 here-in-above: Each of the above Ring Main Units shall comprise of the followings: (A) Load Break Switch (LBS) each comprising of the following: (1) 11 KV, 630Amp, 21kA Motorized Load break switch; with built in line side manual earth switch (2) Position indicator through clear front mimic in line with IEC 62271-103 (3) Live cable indicator with indications (Voltage Presence Indicator) at the front and three inlets provision to check the synchronization of phases. (4) Cable box with termination bushing suitable for upto 2 run, 3core x 150 sqmm, XLPE cable (5) Fault passage indicator (FPI) numerical relay with in-built Overcurrent, Short Circuit and earth fault indication (in each LBS). The FPI should be self-powered and should have internal lithium battery for external indication and setting of FPI in the absence of current. (6) Cable Boots suitable for cable size up to 1 run, 3 core x 150 sqmm XLPE cable Note: LBS shall have 3 positions, open or disconnected, closed and earthed, and will be constructed in such a way that interlocking prevents unauthorized operations. Manual opening and closing will be driven by a fast-acting /snap action mechanism, independent of operator action. LBS and earth switch shall have a minimum of 1000 (M1) mechanical operations , 100 electrical operations at rated current and 5 Nos. operations at rated SC current.

Notes for BOQ item No. 1.00 & 2.00 here-in-above: (B) Vacuum circuit breaker (VCB) each comprising of the following: (1) 11 KV, 630Amp, 21kA Motorized VCB with spring assisted mechanism and series trip coil; with built in manual line side three position disconnector cum earth switch. (2) Position indicator through clear front mimic in line with IEC 62271-103 (3) Self powered relay with O/C , S/C , E/F protection. Relay should have a front USB port for laptop interface , LCD display ,10 event records, 5 fault records, minimum 2 setting group and keypad for setting parameters for the relay. (4) CT of ratio 200/1 A (for BOQ item No 1.00) and CT of ratio 50/1 A (for BOQ item No 2.00), Class 5P10, 2.5VA for protection (5) Live cable indicator with indications (Voltage Presence Indicator) at the front and three inlets provision to check the synchronization of phases. (6) Cable box with termination bushing suitable for upto 1 run, 3core x 150 Sqmm, XLPE cable (7) Cable Boots suitable for cable size up to 1 run 3core x 150 sqmm XLPE cable (C) Additional notes: (1) RMU degree of protection shall be IP54 for outer enclosure and IP67 for SF6 tank. The make of vacuum interrupter should be of the same make as the Ring Main units

Notes for BOQ item No. 1.00 & 2.00 here-in-above: (2) An operator situated in front, lateral and rear (A-FLR 21kA – 1sec, downwards exhaust, for tank as well as cable compartment) of the RMU switchboard during an internal fault will not be exposed to the effects of arcing. Internal Arc Type Test Report for IAC AFLR 21 kA for 1 second for both tank & cable box should have been for minimum 3 way / 3 Function RMU. (3) All operations shall be from front of the RMU, including access to cable bushings .Bushings along the sides or the rear of the RMU are not acceptable. (4)Bus Bar should be of Copper. (5) The rate for making foundation for RMU of size as per recommendation of manufacturer shall be measured & paid separately but drawing of foundation as per manufacturer design shall be approved by GE. (6) The drawings in respect of RMU shall be approved by Accepting Officer through GE and as & when requested by contractor before placing order to manufacturer. (7) RMU shall be tested by representative of Accepting Officer at factory premises before dispatch as & when requested by contractor. (8) The testing and commissing after installation of the RMU shall be carried out in presence of Senior Electrical Inspector as & when requested by contractor. (9) The cost of all above factors deemed to be included in quoted rates.

S&F cable jointing kit for 11 KV (Earthed) grade cable for indoor termination, heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm complete all as specified & directed.

Dismantling of steel tubular poles, strut any size complete all as specified & directed.

Dismantling of cross-arms of MS channel or angle sections etc. complete all as specified & directed.

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

Dismantling of Lightening Arrestor(LA) 11 KV any type, any size complete all as specified & directed.

Dismantling of Gang operated device(GOD) any type/rating complete all as specified & directed.

M&L earthing complete with galvanized steel earth plate 60cm X 60cm X 6mm thick buried vertically in ground to depth not less than 2.25 mtr below ground level, with top edge of earth plate not less than 1.5 mtr below ground level, connected to GI earth lead strip 32mm x 6mm upto 7.5 mtr long by means of bolts, nuts, check nuts and washers of galvanized iron and connection to earthing test point & earth dolly including watering pipe GI 20 mm bore medium grade 2.5 mtr long including protection pipe GI medium grade 40mm bore 7.5 mtr long, wire mesh, funnel,lugs, salt, charcoal dust, excavation & earthwork in soft/losse soil and refilling pit chamber with PCC 1:3:6 type C-1 using 20 mm graded mechnically crushed stone aggregates , RCC 1:2:4 type B-1 using 20 mm graded mechnically crushed stone aggregates pit cover slab 40 mm thick reinforced with 8 mm dia TMT bars @ 15 cm c/c both ways including necessary form work all as shown in electrical plate No 3 of SSR part-I, including testing on completion on site complete all as specified & directed. Notes :- Any variation in length of earth lead and protection pipe of earth lead shall be measured & paid seperately. On testing if the earth resistance is not obtained, earthing will be generated at no extra cost, till the desired earth resistance is obtained. The chamber shall be constructed atleast 1.5 mtr away from the earth electrode.

M&L PCC 1:4:8, type D2, using 40mm graded mechanically crushed stone aggregate as in foundation, filling and mass concrete complete all as specified & directed.

M&L PCC 1:2:4, type B1, using 20mm graded mechanically crushed stone aggregate as in copping of poles/stay/panel including formwork for fair surface complete all as specified & directed.

Excavating in post holes (or similar holes) each not exceeding 0.5cum, in soft/loose soil, getting out, returning, filling in and ramming earth or broken rubble mixed with earth around, in layers not exceeding 25cm and removal of surplus soil to the distance not exceeding 50mtr complete all as specified & directed.

M&L PCC 1:3:6, type C2, using 40mm graded mechanically crushed stone aggregate as in foundation, filling and mass concrete complete all as specified & directed.

S&F galvanized iron chain link fencing 4mm dia, made of mild steel GI mesh 50mm x 50mm weight not less than 4Kg per Sqm, binding the same with binding wires including all necessary drilling , bolting or riveting etc complete all as specified & directed. Notes: (i) Line wire 12mm dia, MS flat iron & Nut/bolts shall be measured & paid seperately. (ii) A BOO of officers shall be ordered by GE to as certiain the unit weight of chain link fencing and shall be measured accordingly.

S&F mild steel screw bolts (machine made) with hexagonal head at one end and screwed the other end or screwed both ends, each screwed end to be fitted with one washers and with one hexagonal nut of exceeding 5cm but not exceeding 10cm length with dia of neck 11mm to 15mm etc complete all as specified & directed.

S&F mild steel work such as angle iron in posts & struts in fencing including cutting tops to shape as directed, drilling holes, notching for wire etc., flat iron fillets (for securing wire mesh etc) including necessary welding where required as per site requirement and other similar works complete, conforming to Gde E-165 (Fe-290) complete all as specified & directed.

S&F mild steel round bars as in tie bars of 12 mm dia, fixed to fencing posts including cut to length, bent to shape, welding of bar at spots as directed and other similar works, conforming to Grade-I, IS-432 (Part I) complete all as specified & directed. Note: Cost of cutting to length, bent to shape rquired & binding with MS wire is included in above

S&F rolled mild steel framed work as in doors or gates of angle or other section with gusset plates, rails, braces, etc., complete, drilled for fixing of steel sheeting or other covering. Doors, etc. to be prepared for hanging or sliding with and including either hooks and hinges or steel hanging door fittings (exclusive of steel sheeting or other covering, running rails and guides) and hanging; also fastening and fixing complete conforming to Fe-410-W(Gde-E-250) Quality 'A' complete all as specified & directed

M&L preparation of new steel and iron based surface of any description over 10cm width or girth and applying two coats of synthetic enamel paint over & including one coat of zinc chrome primer complete all as specified & directed.

M&L consolidated broken stone or boulders hardcore of gauge not exceeding 63mm, deposited, spread and levelled in layers not exceeding 15cm thick each, watered and rammed to a true surface complete all as specified & directed.

M&L 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, fixed with MS clamps, bolts and nuts, for HT of 25cm x 20cm size as per SSR Part-I dully painted with two coats of aluminium paint complete all as specified & directed.

For Credit Schedule, refer tender documents. The amount of credit schedule shall be deducted from total quoted amount of BOQ to arrive contract sum.

Raman Electric Trading Co

M/s RP AGRAWAL

GEPS PROJECTS

ISHWAR ELECTRICALS AND PROCESS SERVICES

RAMAPATI ENGINEERING SERVICES