PROVISION OF RING SYSTEM UNITs AT VARIOUS LOCATIONS OF ASTE UNDER GE (AF) MARATHAHALLI

Amount

Design, Supply, Erection, Testing and Commissioning of 11 KV, 3 phase, 50 cycles, 4 Way (2 incoming , 2 out going ) outdoor type totally enclosed metal clad SF6 insulated Vaccum circuit breaker switchgear having rupturing capacity upto 250 MVA, Breaking Capacity 21 kA, Overload and Earth Fault protection, Rating of 630A, 21 kA for 3sec, SF6 insulated, Motorized, Outdoor type, tested in line with latest IEC standards complete all as specified and directed. The RMU shall be suitable for operations at a height up to 1000 metres above mean sea level and at 40 degree 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 (300 hPa) relative pressure. The RMU tank shall provide fuIl 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. Accidental overpressure 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. An operator situated in front, lateral (A-FLR 21kA - 1 sec, 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 sec for both tank & cable box should have been for minimum 3 way I 3 Function RMU. 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 handle and the gap between the coupled RMU's must be within 10mm. All operations shall be from front of the RMU, including access to cable bushings. Cable bushings along the sides or the rear of the RMU are not acceptable. The connected devices shall be as specified :- (i) Quoted rate includes VCB as per detailed specifications, lab tests, factory testing by representative of Accepting officer, drawing and documentation, tests by the manufacturer/ contractor and pre-comission tests by SEI/EI/AEI.

Manufacturers shall use same make Vaccum Interrupters & Circuit breakers 4 Way (2 incoming , 2 out going ) outdoor type totally enclosed metal clad SF6 insulated Vaccum circuit breaker have following standard electrical & mechanical datas. Vaccum circuit breaker module with Vaccum circuit breaker, three position isolator/earthing switch, busbars, interlocking, earthbar and stored spring energy Incoming mechanism 11 KV Fixed Manually operated Vaccum Circuit Breaker as Incoming 2 Vaccum circuit breaker module with Vaccum circuit breaker, three position isolator/earthing switch, busbars, interlocking, earthbar and stored spring energy mechanism, Vacuum circuit breaker 11 KV, 630A, 21kA for 3-sec Microprocessor base, Numerical type self-powered relays with O/C and EE protection CSDPR relay 1 Set of 3 Ring Core Protection CTs 2.5VA Class 5P10. Ratio as per load requirement at site, 1 Cable bushings, 400 series bolted, 1 Capacitive voltage indicator fixed type VPIS 9-15 kV, PT ration 11KV/110 Volts all as specified and directed. NOTE :- (i) The quoted rate shall be inclusive of the following :- (a) PCC platform of suitable size for mounting the panel board duly painted including reconnection of earth strip leads, cables etc complete. (b) Lifting and lowering of RMU on platform by Crane complete with all accessories complete all as specified and directed by Engr-in-Charge.Location : TARMAC

Design, Supply, Erection, Testing and Commissioning of 11 KV, 3 phase, 50 cycles, 3 Way (1 incoming , 2 out going ) outdoor type totally enclosed metal clad SF6 insulated Vaccum circuit breaker switchgear having rupturing capacity upto 250 MVA, Breaking Capacity 21 kA, Overload and Earth Fault protection, Rating of 630A, 21 kA for 3sec, SF6 insulated, Motorized, Outdoor, type tested in line with latest IEC standards complete all as specified and directed. The RMU shall be suitable for operations at a height up to 1000 metres above mean sea level and at 40 degree 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 (300 hPa) relative pressure. The RMU tank shall provide fuIl 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. Accidental overpressure 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. An operator situated in front, lateral (A-FLR 21kA - 1 sec, 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 sec for both tank & cable box should have been for minimum 3 way I 3 Function RMU. 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 handle and the gap between the coupled RMU's must be within 10mm. All operations shall be from front of the RMU, including access to cable bushings. Cable bushings along the sides or the rear of the RMU are not acceptable. The connected devices shall be as specified :-

Manufacturers shall use same make Vaccum Interrupters & Circuit breakers 3 Way (1 incoming , 2 out going ) outdoor type, totally enclosed metal clad SF6 insulated Vaccum circuit breaker, have following standard electrical & mechanical datas. Vaccum circuit breaker module with Vaccum circuit breaker, three position isolator/earthing switch, busbars, interlocking, earthbar and stored spring energy, Incoming mechanism 11 KV, Fixed Manually operated Vaccum Circuit Breaker as Incoming 1 Vaccum circuit breaker module with Vaccum circuit breaker, three position isolator/earthing switch, busbars, interlocking, earthbar and stored spring energy mechanism, Vacuum circuit breaker 11 KV, 630A, 21kA for 3-sec 1 Microprocessor base, Numerical type self-powered relays with O/C and EE protection CSDPR relay 1 Set of 3 Ring Core Protection CTs 2.5VA Class 5P10. Ratio as per load requirement at site, 1 Cable bushings 400 series bolted, 1 Capacitive voltage indicator fixed type VPIS 9-15 kV, PT ration 11KV/110 Volts all as specified and directed. NOTE :- (i) The quoted rate shall be inclusive of the following :- (a) PCC platform of suitable size for mounting the panel board duly painted including reconnection of earth strip leads, cables etc complete. (b) Lifting and lowering of RMU on platform by Crane complete with all accessories complete all as specified and directed by Engr-in-Charge.Location : Guard Rooma and Old power house

M & L for excavation in trenches in Soft / Loose soil not exceeding 1.5 metre wide and not exceeding 1.5 metre deep for laying of cables etc, getting out and forming bottom surface to required gradient Complete all as specified and as directed.

M & L for returning filling including Spreading levelling watering and well ramming to excavated soil in layers not exc 25 cm thick Complete all as specified and as directed.

M & L for removing excavated material not exc 50m and depositing where directed at a level not exc 1.5m above the starting point in soils Complete all as specified and as directed.

M & L for riddled earth soil for Cushioning to cables in a layer of 8 cm thick before laying the cable in and second layer of 15 cm thick after laying the cable Complete all as specified and as directed.

S & F sub class burnt Bricks for cable protection Complete all as specified and as directed.

M & L for G.I. tubing light grade of size 80mm bore for protection of cables to be laid under roads, crossings / culverts Complete all as specified and as directed.

Supply ,laying and testing of HT UG cable XLPE insulated ,screened , PVC bedded , galvanised steel strip or wire armoured electric power cable (heavy duty ) with stranded aluminium conductor ,11000 volts grade of size 3 core 185 sqmm Complete all as specified and as directed.

S & F Cable jointing kit for HT 11KV (Earthed) cable for Outdoor end termination , heat shrinkable type joint kit complete with jointing material and accessories suitable for XLPE armoured aluminium conductor cable of 185 Sqmm x 3 core cross sectional area including testing after jointing, fixing in replacement complete all as specified as directed by Engineer-in-Charge.

M & L for Earthing complete with galvanized iron or steel plate electrode 600 mm x 600 mm x 6.0 mm buried directly in ground vertically in pit of depth not less than 2.25 metre below normal ground level with top edge of the earth plate at a depth not less than 1.5 metre below normal ground level, surrounded from all sides with mixture of charcoal and common salt in alternate layers and electrode connected to galvanized iron strip 32 x 6mm dia as earthing lead by means of GI bolts, nuts, check nuts and washers, earth wire protected by galvanized steel pipe 15 mm bore (light grade) connected to machinery/ equipment including necessary excavation and earth work in any type of soil, 20 mm bore light grade GI pipe for watering funnel wire mesh, PCC (1:3:6), type C-1 chamber, RCC (1:2:4), type B-1, reinforced with 6 mm dia MS round bars @ 15 cm c/c both way for cover and MS frame etc., complete all as specified.

Supply, installation, testing & commissioning of 11 KV Outdoor type 630 Amps RMU (Ring Main Unit) 03 way (Two Incoming and one outgoing) floor mounted outdoor type with internal copper bus bars (03 Nos) and consisting of 02 No fixed type motorized Vacuum Circuit Breaker(CCV+) as incoming and 02 Nos fixed motorized Load Break Switch as outgoing complete all as specified and directed. A 11 live parts, bus bars, LBSs connections of RMU should be enclosed in one tank to avoid multiple interconnections & sealed for life, robotically welded non magnetic and non ferrite grade stainless steel tank Grade 304 of minimum 2.5 mm thick having lP67 degree of protection filled with SF6 gas insulation with leakage rate less than 0.1% per year tested as per IEC 6227 1-200. The unit shall have front cable entry for ease of installation and shall have site replaceable bushings for ease of troubleshooting during breakdown. Also, the outdoor enclosure door shall cover the fuIl length of the switchgear. It is preferable to have a design of accomodating minimum five nos. modules in a single tank wherever applicable. RMU should have complete accessories such as Ring core current transformer type 10011A, 2.5 VA 5P10 for protection,Terminal boots, VPIS, cable supports, all front cable termination boots, battery-charger, mechanical indicators for Load break switch ON/OFF, Manometer as per IEC standards 62271- 200, 60265-1, 62271-102, 62271-100 and 60694. Suitable for altitude of installation up to 1000m as per IEC 60120. Bushings shall be bolted type top mounted outside the tank for connection of external bus bar NOTE :- (i) The quoted rate shall be inclusive of the following :- (a) PCC platform of suitable size for mounting the panel board duly painted including reconnection of earth strip leads, cables etc complete. (b) Lifting and lowering of RMU on platform by Crane complete with all accessories complete all as specified and directed by Engr-in-Charge.Location : TARMAC

Outgoing Vacuum circuit breaker 11 kv, 630A, 21kA for 3-sec 1 Microprocessor base Numerical type self powered relays with O/C and E/F protection CSDPR relay. 1 Set of 3 Ring Core Protection CTs 2.5YA Class 5P10 Ratio as per load requirement site. 1 Cable bushings 400 series bolted 1 Capacitive voltage indication fixed type VPIS 9-15 kV Air insulated module 11kv, 630A, zlkA for 3-sec, 2 x 12 battery & battery charger, Manual operating handle Coupling set complete all as specified and directed.

M & L for disconnecting all electrical connections from the pole and other plants and machineries and renstallation of the joints and connections after installtion of VCBs and RMUs at the desired location all as specified and directed.

devan enterprises (BID ID -3194912)

Mohan Engineering Installation and Services (BID ID -3194966)