CWE(BHI)/BHI-12/2023-24

Amount

Design, Supply, Erection, Testing and Commissioning of 11 KV, 630A, 25KA for 1 sec, SF6 insulated, Manual, Outdoor, Non-extensible RMU, type tested in line with latest IEC standards. The RMU shall be suitable for operations at a height up to 1000 meters above sea level and at 40 degree ambient temperature without any deratting. 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 base paint, suitable for the site installation conditions. Accidental overpressure due to an internal arc is limited by the operating 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 10mm complete all as specified and directed by Engineer-in-charge. 11kv 630A 4Way Ring Main Units (1 nos. Load Break Switch for incomer and 3 nos Vaccum Circuit Breaker for outgoing) Each of the aboe Ring main unit shall comprise of the following: (A) load break switch (LBS) each comprise of the following :- (i) 11 KV, 630A, 25KA/ 1 sec Manual load break switch, with built in line side manual earth switch (ii) Position indicator through clear front mimic in lin with IEC 62271-103 (iii) Live cable indicator with indicators (voltage presence indicator) at the front and three inlets provision to check the synchronization of phases. (iv) Cable box with termination bushing suitable for upto 2 RUN 3Cx300 Sqmm XLPE cable. (v) Fault passage indicator (FPI) with in-built overcurrent short circuit and earth fault indication (in N-1) LBS). The FPI should be self-powered and should have internal lithium battery for external indication and setting of FPI in the absense of the current. (vi) Cable boots suitable for cable size up to 1R * 3C*300 sqmm cable. Note :- LBS shall have 3 positions, open or disconneted, 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 min of 1000 mechanical operations, 100 electrical operations at rated current and 5 Nos operations ar rated SC current.

B. Vacuum circuit breaker (VCB) each comprising of the following:- (i) 11 KV,630A 25kA / 1 sec Manual VCB with spring assisted mechanism and series trip coil ; with built in manual line side three position diconnector cum earth switch. (ii) Position indicator through clear front mimic in lin with IEC 62271-103. (iii) Self powered/ auxiliary powered relay with 0/C S/C E/F protection. Relay should have a front USB part for laptop interface, LCD dislay 10 event records 5 fault records min 2 setting group and keypad for setting parameters for the relay. (iv) Suitable ratio CT--/1/A class 5P10 2.5VA for protection. (v) Live cable indicator with indications (Voltage presence indicator) at the front and three inlets provision to check the synchronization of phases. (vi) Cable box with termination bushing suitable for upto 1 RUN 3Cx300sqn mm XLPE cable. (vii) Cable boots suitable for cable size up to 1R * 3C*300 sqmm cable. (viii) The circuit breakers shall have 2 positions : open or disconnected and closed. A separate and independents 3 position earthing switch and diconnector shall be fitted to open and earth the cables in such way that interlocks prevent all unauthorzed operations. An operating mechanism can be used to manually close the circuit breaker and charge the mechanism in a single movement. An independent mechanism shall be fitted for the 3 positions earthing switch and disconnector. Circuit breaker shall be fitted with a local system for manual tripping by an integrated push button. There will be no automatic reclosing. Circuit breaker shall have a min of 2000 mechanical and electrical operation and 50 nos dead short circuit operations. Disconnector and earthswitch shall have a min of 1000 mechanical operations, 100 electrical operations at rated current. Additional notes (a) RMU degree of protection shall be IP54 for outer enclosure and IP67 for SF6 tank. (b) The make of vacuum interrupter should be of the same make as the Ring Main Units. (c) An operator situated in front lateral and rear (A-FLR 21kA) -1 sec downwards exhaust for tank as well as cable compartment) of the RMU switchboard durig an internal fault will not be exposed to the efforts of arcing. Internal are type test report for IAC AFLR 21kA for 1 sec for both tank & cable box should have been for minimun 3 way/ 3 function RMU. (d) All operations shall be from front of the RMU including access to cable bushings. Bushing along the sides or the rear of the RMU are not acceptable.

Supply, installation, testing and commissioning of transformer oil natural air natural (ONAN) cooled, oil immersed copper wound outdoor type step down complete with first fitting of IS 1180 ISI marked filtered and dehydrated transformer oil and other standard fittings/accesssories as per particular specifications and seven position off circuit tap changer (tapping range +5% to -10% in steps of 2.5% each) with vector group Dyn-11 with HV and LV cable boxes with cable glands as per cable sizes, as persite requirement , HT 11 KV 3 phase 4 wire 50 HZ as per level- III of IS 1180:2014 of capacity 500 KVA, 11 / 0.433 V, complete all as specified and directed by Engineer-in-charge. Note : (i) Pre dispatch inspection of transformer shall be carried out by rep of accepting officer at manufacturer premises witnin overall cost quoted by the contractor . Nothing extra shall be payable on this account at later stage. (ii) After installation of the transformer the same shall also be tested by SEI and all the equipment /instrument shall be arranged by the contractor for testing.The cost of the same shall also be included in the item rate. (iii) Plinth of required size and design as per manufacturer recommendation shall be the part of this job including earth work"

Supply , laying , jointing and testing XLPE insulated screened,PVC bedded,galvanised steel stripe or wire armoured,electric power cables (heavy duty) with standard aluminium conductor,11000 Volts grade of size 3 core 120 Sqmm, complete all as specified and directed by Engineer-in-charge.

Supply , laying , jointing and testing XLPE insulated screened PVC bedded galvanised steel stripe or wire armoured,electric power cables (heavy duty) with standard aluminium conductor,11000 Volts grade of size 3 core 95 Sqmm, complete all as specified and directed by Engineer-in-charge.

S & F cable jointing kit 11 KV grade Cable for outdoor termination heat shrinkable type joint complete with jointing material and accessories suitbale for 3 core XLPE aroumred aluminium conductor cable size 50 Sqmm to 95 Sqmm, complete all as specified and directed by Engineer-in-charge.

S & F cable jointing kit 11 KV grade Cable for outdoor termination heat shrinkable type joint complete with jointing material and accessories suitbale for 3 core XLPE aroumred aluminium conductor cable size 120 Sqmm to 185 Sqmm, complete all as specified and directed by Engineer-in-charge.

Supply , laying and testing cable XLPE insulated armoured heavy duty electric cable with aluminium conductor, 1100 volts grade cross sectional area size 300 Sqmm 3.5 Core, complete all as specified and directed by Engineer-in-charge.

Supply, Install , testing and commissioning of LT panel of suitable size for 3 Phase 415 Volts outdoor type made out 3.15 mm thick CRCA sheet of sides of the panel board and 1200 amps rated Alumunium bus bar, insulated with PVC sleaves and coloured with (red, yellow,blue and black) CTR and internal wiring with suitable size of PVC insulated copper wire , use with angle iron 50x50x6 mm frame bottom of the panel board , grouted by using PCC foundation 1:2:4 type B1 with 20 mm graded stone aggregate , thimbling and cable entry boxes with cable gland incl powder coated complete complete all as specified and directed by Engineer-in-charge with following :- (a) ACB 4 pole 800 Amps 50KA, Fix type Manual Operated - 02 Nos (incoming) (b) Bus Bar Coupler 4 Pole 1000 amps without protection - 01 No (c) MCCB 4 Pole 630 Amps 50 KA,adjustable type - 02 Nos (Outgoing) (d) Mulifunction meter 3 PH, size 96 X 96 Sqmm digital type Including CTs, PTs, Etc - 02 Nos (e) LED Indicator lamp RYB (03 Nos) - 02 Set Notes : (i) Plinth of required size and design as per manufactor recommdation shall be the part of this job including each work. (ii) Control wiring should be only done by 2.5 Sqn mm , FRLS single core copper conductor only. (iii) Each breakers (ACB/MCCB) and busbar shall have separate compartment of his own. (iv) Bus bar and all breakers are inter connected with aluminium strips of required size. (v) All breakers shall be provided with stickes showing capacity and feeder name as directed by Engineer-in-charge.

Supply and laying synthetic rubber insulated mats 2.5 mm thick for voltage upto 11 KV for electrical purpose as per IS 15652 - 2006 (Superseding IS 5424) suitable for electrical shock safety of size 2x1 meter, complete all as specified and directed by Engineer-in-charge.

Excavation in trenches not exc. 1.5 m wide and not exceeding 1.5m depth for foundation of poles/laying of cables/stay/strut etc not exceeding 10 Sq m on plan and getting out in soft/loose soil, complete all as specified and directed by Engineer-in-charge.

Returning filling in trenches, spreading, levelling, watering and well ramming in layers n.exc 25cm in hard /dense soil, complete all as specified and directed by Engr-in-Charge.

Removing of surplus excavated soil to a distance n.exc 50 mtr and depositing where directed at a level n.exc 1.5 mtr above starting point, complete all as specified and directed by Engr-in-Charge.

Material and labour for providing sand as in sand cushioning to under ground cable including punning down of sand in layers, complete all as specified and directed by Engineer-in-charge.

Material and labour for cable protection cover of UG LT cable by old size bricks common burnt clay building bricks sub class `B’ laid dry and flat abutting each other with width equal to length of brick and gap between adjacent brick not exceeding 10mm, complete all as specified and directed by Engineer-in-charge.

Material and labour earthing complete with copper plate electrode 600x600x3.15 mm thick buried directly in ground (earth pit not less than 2.25 mtr deep below normal ground level) with top edge of the plate not less than 1.5 mtr below normal ground level,the earth electrode surrounded by adequate quantity of charcoal dust and salt to a packed thickness of 15cm on all side and including connected to and including copper strip of size 20x3 mm upto 7.5 mtrs long by means of nuts and bolts, check nuts and washers of GI and connected to earhing test point and earth dolly all as shown in electrical plate No 3 of MES SSR part I and testing on completion including necessary excavation and earth work in any type of soil,PCC(1:3:6)type C1 chamber,pre-cast RCC slab 50mm thic in cement concrete (1:2:4),type B1,reinforced with welded steel wire fabric or XPM,(weight not less than 4 Kg per Sqm) with cast iron frame,funnel with watering pipe 20mm dia medium grade,wire mesh and lugs,GI protection pipe,15mm dia,light grade,7.5 mtr long for protection of earth lead upto test point etc all as specified and as directed by Engineer-in-charge.

Material and labour for PCC cable protection cover, class HV, Type 1, flat, of size 300mm x 180mm x 40mm for HT UG cable and gap between adjacent cover not exceeding 10mm, complete all as specified and directed by Engineer-in-charge.

Rasvinderpalandco