PROVISION OF INDEPENDENT ELECTRIC SUPPLY TO 12 TAC AF AT DRONACHAL

Supply, installation, testing and commissioning of 160 KVA Compact Sub-station (CSS), outdoor type, factory assembled, pre-wired and pre-tested, complete with civil coordination, consisting of the following:-

(a) HT Side :- 11 kv, 630 A, Horizontal Draw Out VCB with manual/ 230 V AC Motor operated Spring Charging mechanism with 24V DC closing/ opening shunt trip coils, Aux switch, Mechanical ON/OFF push button. Mechanical operating counter with metering cubical, Auxillery relay, battery power pack with 7AH Battery & in built charger for 24V circuit Potential transformer- 3 phase cast resin of ratio 11KV/110V, class- 0.5, 100VA with HT primary fuses. Current Transformer- cast resin ratio: 40/20/5+5A, core1:CI 0.5, 15VA, Core2: Cl.5P10, 15VA, Protection Numerical 2OC+1EF Relay, Micro Processed based Non-Directional IDMT, indication lamps VCB off/ on/ auto trip/ trip circuit healthy/ spring charge indication, digital voltmeter, digital ammeter complete all as specified and as directed by Engr-in-charge.

(b) Distribution transformer , 160 KVA, 11 KV/ 433 Volt, 3-phase, 50 Hz, dry type cast resin step down transformer, ONAN cooling, vector group Dyn-11, copper wound, off-tap changer having 5 position off circuit tap links of (+5% in steps of 2.5% each with all standard fittings & accessories including digital type WTI with Aarm and trip contacts & RTD sensors, confirming to IS-2026(Part-11)-2021/ IS : 11171. Complete all as specified and as directed by Engr-in-charge.

(c) LT Section:- Lt Panel 415V, 3-phase, 4 wire, metal enclosed, comprising Incoming MCCB 250 A 36 KA-01 Nos magnetic release based with over current and short circuit protection , Outgoing:- MCCB- 125A 4P 25KA- 02 Nos, & MCCB- 100A 4P 25KA - 02 Nos with thermal magnetic release based with over current and short circuit protection, multimete,250A/5A LTCT CI: 1.0, Space heater with ON/OFF switch and thermostat, single phase switch with socket, LT cubical illumination Lamp with Door limit switch and MCB's for AC/DC control, MS steel sheet enclosure suitable for outdoor installation with MS base channel, provision for receiving incoming cables through bottom entry and out going through bus bar to panel, Excluding termination kit & glands. Provision for receiving incoming through bus duct by bus bar and outgoing through cable box bottom entry excluding termination kit & glands, complete all as specified and as directed by Engr-in-charge.

(d) APFC Section:- APFC (Automatic power factor correction ) panel of 75 KVAr with suitable capacitor bank ( Step wise), MCCBs/MCBs for AC/ DC control complete with APFC relays, contactors, protections, indication Lamps, meters , accessories required and weather proof compact enclosure. complete all as specified and as directed by engr-in-charge.

(e) Enclosure Section of CSS :- Space heater with ON/OFF switch and thermostat, single phase switch with socket, LT cubical illumination Lamp with Door limit switch and MCB's for AC/DC control, MS steel sheet enclosure suitable for outdoor installation with MS base channel, provision for receiving incoming cables through bottom entry and out going through bus bar to trf panel, Excluding termination kit & glands. Provision for receiving incoming through bus duct by bus bar and outgoing through cable box bottom entry excluding termination kit & glands, complete all as specified and as directed by Engr-in-charge. Note:- The cost of foundation and plinth as recommended by manufacturer is deemed to be included in quoted rate.

Material & labour for earthing complete with galvanized steel earth plate electrode (600x600x6.3)mm thick , buried directly in ground (earth pit not less than 2.25 metres deep below ground level) connected to galvazied iron strip 32x6 mm as earthing lead by means of nut, bolts and washers, steel pipe of 25mm bore light grade for protection of earth lead with PCC chamber (1:2:4) type B1 using 20mm graded stone aggregate internal surface of concrete chamber shall be given 10mm thick plaster in CM (1:4), funnel with wire mesh, 50mm thick cover RCC (1:2:4) type B1 using 20 graded aggregate reinforcement with 8mm dia MS bar at 80mm center to center both way and incl charcoal dust and common salt all as shown in eletrical Plate No.3 of SSR Part-I as specified incl necessary excavation and earth wk and connecting the earth to earth test point incl testing complete. Note :- (i) GI strip upto 7.5 mtr deemed to be included in the quoted rate.

Supplying, Laying connecting & testing XLPE insulated, PVC sheathed, armoured HT electric power UG cable (heavy duty with stranded aluminum conductor) of size 95 Sqmm, 3 core, 11000 Volts(Earthed) grade, confirming to IS-7098 (Part-II) laid through duct/ pipe / in trench etc. with cable glands complete all as specified and as directed. Note : Earth work, brick protection and sand cushioning and GI Pipe Shall be measured and paid separately under respective item.

Supply and fixing, laying & testing of cable XLPE insulated screened PVC bedded, galvanized steel wire armoured, electric power cables (heavy duty) 1100 volts grade with stranded aluminum conductor of size 185 sqmm 3.5 core all as per IS , specified & directed.

Supply and fixing, laying & testing of cable XLPE insulated screened PVC bedded, galvanized steel wire armoured, electric power cables (heavy duty) 1100 volts grade with stranded aluminum conductor of size 120 sqmm 3.5 core all as per IS , specified & directed.

S & F in repairs XLPE Cable end termination, heat shrinkable, indoor type, suitable for voltage 6.35 kV/ 11 kV (Earthed), 3 core, 50 sqmm to 95 sqmm complete all as specified and as directed.

M&L indoor/outdoor end terminations Joints kit (Epoxy) Cable Joint Kit including Jointing Materials for making Joints of UG Electric Cable 1100 Volt Grade Heavy Duty with PVC/XLPE insulated Aluminium Stranded Conductor, nominal Cross-Sectional area from 185 Sqmm upto 240 Sqmm, 3½ Core and Testing complete all as specified and as directed.

M&L indoor/outdoor end terminations Joints kit (Epoxy) Cable Joint Kit including Jointing Materials for making Joints of UG Electric Cable 1100 Volt Grade Heavy Duty with PVC/XLPE insulated Aluminium Stranded Conductor, nominal Cross-Sectional area from 120 Sqmm upto 185 Sqmm, 3½ Core and Testing complete all as specified and as directed.

Supply and fixing servo Voltage stabilizer for automatic operation three phase naturally oil cooled indoor type & designed for input variation between 340 V to 460 V with output voltage stabilized at 415 with accuracy ± 1% and speed of correction 50 Volts per second and of capacity 75 KVA complete all as specified and as directed by Engr-in-charge.

Supply,installation,testing and commissioning of 11 KV,630A,Extensible Outdoor type (IP54), Thickness of outer cell is 3.15mm RMU (Ring Main Unit) with 1 No. Bus PT Metering 3-way comprising of 01 Nos motorised Spring charging fixed-type load break switch as incomer and out going 02 Nos, motorised charging fixed-type Vaccum Circuit Breaker as Outgoing, inside robotically welded stainless steel 304/441 (NonFerrite Non magnetic grade) tank having min thickness 2.0mm with IP67 Degree of protection. RMU should be provided with internal busbars, as well as earthing busbars of electrolytic grade copper, padlock provisions ,spring charging handle & complete with all accessories. The RMU shall be type tested for internal arc, IAC AFLR 21 kA for 1 sec for both tank & cable compartment. Suitable battery charger as per no of functions of RMU shall be provided in RMU. The earthing busbar shall be provided inside each cable compartment for solid earthing of cable sheilds. The outer cable door should be as per IP-54 and manufacturers designeded specification for providing fail-safe protection. The unit shall include the following with all necessary standard fitting as required at site. Minimum 5 module should accommodate in one tank to avoid multiple coupling at site complete all as directed and specified. Note:- The PCC foundation work as per manufacturers instruction/design shall be measured and paid separately under relevant item of sch 'A'.

The RMU shall be capable of operating normally within the following temperature range: Design ambient air temperature: + 40 ° C (option +50°C with derating) Minimum air temperature: - 5 ° C (option -25°C) IEC 62271-1 common clauses for MV switchgear standards, IEC 62271-200 2011 MV metal-enclosed switchgear, IEC 62271-103 2011 MV Switches IEC 62271-102 2013 AC disconnectors and earthing switches, IEC 62271-100 2012 MV AC circuit breakers, IEC 62271-105 2012 MV AC switch-fuse combination,

(A) Incomer :- Load break switch SF6 insulated Motorized Breaker module - 01 Nos and each Load break switch comprising of following accessories :- Each feeder with switch consists of :- 1. Motorised 630A load breaker switch with built-in each switch with full making capacity -01Nos 2. Mechanical position indicator switch ON/OFF/EARTHED - 1No. 3. Live Cable Indication - 1No. 4. cable compartment cover interlocked with earth switch - 1No. 5. Cable termination bushings suitable for 1No. 1CX95 sqmm XLPE cable - 1No. 6. Fault Passage Indicator with associated CTs - 1No . 7. Digital Multifunction Meter with RS-485 port (A, V, KW, KVA, KWh, Pf, F,etc ) 1No.

8. NO/NC contact for :- (a) Isolator ON/OFF. (b) Earth switch ON/OFF. (c) Fault Indicator Operated. Command Output for :- (a) isolator close. (b) Isolator Open. (c) FPI reset 1 set. 9. Mechanical interlock between incomers. 10. Resin cast, Ring Core CTs of suitable capacity for protection installed away from bushing to prevent saturation of core. CT ratio to be confirmed during drawing approval - 03No. Bus PT : 03NOs. Potential transformers with HT fuse on primary side and MCB on secondary side for protection and primary voltage :22000:V3v & secondary voltage: 110:V3v with burden winding 50VA, class of winding 1- 1set.

(B) Outgoing :- VCBs, SF6 insulated Motorized Breaker module -02 Nos and each VCBs Breaker comprising of following accessories :- 50 breaking operations (E2) at Rated Short Circuit Current on Circuit Breakers (i) 11KV,630A fixed-type Vaccum Circuit breaker module for making and breaking of fault current alongwith disconnector + Earth switch of Full making capacity. (ii) Short time current 16 to 20 KA/3sec,breaking capacity (iii) Auxillary contacts -1NO + 1NC (iv) Manual/motorized spring-charging,associated closing/tripping coils. (v) Spring- charging operating handle and ON/OFF push buttons mechanically latches to the mechanism. (vi) cable box with cable cover interlock for front termination of the cable suitable upto 2 R x 3 core 120 sqmm (XLPE) for load break switch and upto 1R x 3 core 95 sqmm (XLPE) for VCB feeder. Cable door should be as per IP54 and manufacturer design and specification.

(vii) Numerical based self-powered OC+EF protection Relay, Over Current (min,setting 20%), Earth-fault (min.setting :10%) (viii) Resin cast, Ring Core CTs of suitable capacity for protection (Acc.Cl.5P10),installed away from bushing to prevent saturation of core. CT ratio to be confirmed during drawing drawing approval -03Nos. (ix) Cable covers with self interlocking mechanism between doors,earth switch, disconnector & VCB. (x) capacitive voltage indication fixed type system. (xi) Mechanical Indications for breaker ON, OFF,EARTH,spring charged- Discharged.

Construction of platform for RMU (Ring main unit) upto 3 way as per drawing provided by manufacturer and approved by GE and foundation depth 200mm including necessary earth work in any type of soil (clear height with additional 150mm Thick PCC 1:3:6 type C-2 foundation below ground level), made out of 23 cm brick masonary in cement mortar 1:6, (One side of platform to be hollowed for cable alley ), with a 100 mm thick re-inforcement cement concrete 1:2:4, type B-2, 8 mm dia MS bar as in floor of platform, plastering in CM 1:4, including stair for platform as per site requirement Complete all as specified and directed.

Excavating in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc. or for cable laying or not exceeding 10 sqm on plan and not exceeding 1.5 m in depth and getting out in hard/ dense soil complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25 cm in soft/ loose/ hard/ dense soil complete all as specified and as directed.

Removing excavated material (soils) not exceeding 50 m and depositing where directed at a level n exc. 1.5 m above the starting point

Supply & spreading in trenches dry river sand cushioning to underground cable in trenches including spreading, levelling, hand punning down complete all as specified and as directed. Note:- Depth of sand cushioning will be measured after punning down and levelling the sand properly.

Supply & laying unreinforced precast concrete cable cover class HVP type 1, with peak shape, dimension 450mm x 180mm x 40mm peak thickness as per IS 5820: 1970 complete all as specified and as directed.

Supplying and laying un-reinforced precast concrete cable cover flat, size 250mm x 150mm x 40mm for protection of under ground cable complete all as specified and directed.

Supply and fix in replacement of 100mm dia bore tubes, 'light grade' galvanized, with all fitting and fixed complete to walls/ poles or laid in trenches/ floors for cable protection complete all as specified and directed by Engineer-in-Charge.