Special Repairs to External Electric Supply in ENCO Mess under GE Utility I, Visakhapatnam

Amount

Supply, Installation, testing & commissioning of Factory Made 11 kV, 630 Amps, 21 kA for 3 Seconds, SF6 Insulated, Motorised, Outdoor extensible type 7 Way RMU Consisting of 2 Nos. VCBs as Incoming and 5 Nos. of VCBs as Outgoing with SCADA Compatible complete all specified and as directed and shall comprise of the following: Make: ABB / Schneider / Siemens . The make of vacuum interrupter, FRTU offered is the same make as the Ring Main unit.

[A] RMU shall be 11 KV, 630 Amps, 21 kA for 3 Seconds, SF6 Insulated, Motorized, Outdoor, 7 Way RMU, Right side Extensible with Air Insulated Bus Connected Metering unit, Type tested in line with latest IEC Standards, suitable for operations at a height up to 1000 Meters above sea level and at 40ºC Ambient Temperature without any de-rating, Switchgear and Busbar shall all be contained in a Stainless Steel Enclosure [Minimum 2.5mm thick SS 304 Grade] filled with SF6 at 0.3 Bar [300 hPa] Relative Pressure, RMU Tank shall provide Full Insulation and Switchgear shall be insensitive to the environment with Degree of Protection of IP67, Switchgear Operating Mechanism shall have an IP2X Protection and Cable Chamber shall have IP3X Protection, Outer Enclosure shall be IP 54 type tested, Powder Coated with Pure Polyester Based Paint, suitable for the site installation conditions, 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, 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 shall require 450mm to handle and the gap between the coupled RMU’s must be within 10mm.

[B] Vacuum Circuit Breaker [VCB] Each shall be comprising of the following: [i] 11 KV, 630 Amps, 21 kA/ 3s, 3 Pole Manual/ Motorised VCB with 3 pole manual disconnector and 3 pole manual earth switch, manual/ motorized Spring Assisted Mechanism and Series Trip Coil – 1 No. [ii] Self Powered Relay with O/C, S/C, E/F Protection. Relay shall have a Front USB for Laptop Interface, LCD Display, 10 Event Records, 5 Fault Records, min 2 setting group and keypad for setting parameters for the relay – 1 No [iii] CT Ratio 200-100/1-1A for Incoming and CT Ratio 100-50/1-1A, for Outgoing, Class - 1.0, 2.5VA for Metering and Class 10P10, 2.5 VA for Protection – 1 Set [iv] CT Ratio 100-50/1-1A, for Outgoing, Class - 1.0, 2.5VA for Metering and Class 10P10, 2.5 VA for Protection – 1 Set [iv] Live Cable Indicator with indications at the Front and Three Inlets to check the Synchronization of Phases – 1 No [v] Cable Termination Bushing suitable for up to 1 Run, 3 Core, 185 Sq.mm, XLPE Cable – 1 Set [vi] Cable Termination Cover Boots [Push on type] – 1 Set [vii] Circuit Breakers shall have Two Positions: Open or Disconnected and Closed. A separate and independent 3 Position Earthing Switch and disconnector shall be fitted to open and earth the cables in such way that interlocks prevent all unauthorised operations. An operating mechanism shall 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 shall be no automatic reclosing. Circuit Breaker shall have a min of 2000 Mechanical and Electrical Operations and 50 Nos Short Circuit Operations, Disconnector and Earth Switch shall have a minimum of 1000 [M1] Mechanical Operations , 100 Electrical Operations at rated current and 5 Nos Operations at Rated Short Circuit Current.

[D] Air Insulated Bus Connected Metering Unit comprising the following: – 1 Set [i] Air Insulated Enclosure with necessary Bus Connection – 1 No [ii] PT 11KV / RT 3 / 110V / RT3, 25 VA, Class-1.0 – 1 Set [iii] Multi Function Meter, Digital Type [Displaying A, V, PF, Hz, KVA, KW, KVAR, KWH, KVARH etc. Class 1.0 / 0.5] with RS485 Port for Communication in Modbus Protocol. [iv] R / Y / B Indicating Lamps – 1 Set [v] 11 KV / 230V AC, Class 1, 500VA Control Transformer – 1 No [vi] Battery and Battery Charger, 12 Ah, [I/P-230V AC, O/P - 24V DC] – 1 No [E] Space Heater with thermostat

Note: [a] An operator situated in front, lateral and rear [A-FLR 25 kA – 1 Sec, Downwards Exhaust, for Tank as well as Cable Compartment] of the RMU Switch board during an internal fault shall not be exposed to the effects of Arcing. Internal Arc Type Test Report for IAC AFLR 25 kA for 1 Sec for both Tank & Cable Box shall be for minimum 3 Way / 3 Function RMU. [b] 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. [c] Construction of Plinth / Foundation for 11KV RMU: The rate quoted is deemed to be including the cost of Plinth / Foundation and shall be paid extra on this account. The foundation shall consists of Two Parallel Brick Walls built using Fly Ash bricks straight or curved on plan to any radius built in Cement Mortar 1:6 of length 2.10m, suitable thickness and height as per the manufacturer’s instructions over PCC Concrete Bed of 150mm thick in PCC 1:4:8, Type D-2, using 40mm graded stone aggregate over 150mm thick Hardcore of gauge not exceeding 63mm of broken stones or boulders, deposited, spread and levelled in layers not exceeding 15 cm thick watered and rolled, over 150mm thick Sand Bed, rendering to brick surfaces, 15 mm thick in Cement Mortar 1:4, and finishing the top surface even and smooth without using extra cement, applying Three coats of white washing including earthwork excavation of pit size 2.10 X 1.20 X 0.60 Metres complete all as per manufacturer’s recommendations, drawings, as specified and as directed. [d] The rate quoted is also deemed to be including the cost of disconnection of HT Cables up to 3 Core, 240 Sq.mm from existing 2 Pole / 4 Pole Structures, removing of cable loop and reconnection to RMU complete all as specified and as directed by the Engineer-in-Charge. [f] End termination joints shall be measured and paid separately.

Dismantling carefully the existing transformer of capacity upto 750 KVA, 11 KV/440 Volts including demolition of foundation, disconnecting the existing elecrtical and mechanical connections both HV/LT side etc, transportating, loading, unloading, provision of suitable platform as specified under note hereinafter and re-installing the transformer alongwith its accessories at location as directed by Engineer-in-Charge, topping up of transformer oil, testing and commissioning complete all as specified and as directed. Note : The rate quoted is deemed to be including the cost of PCC / Brick Masonry Foundation / Platform as per IE Rules and of size not less than 2.00 X 2.00 X 1,80m made of brick work using Fly Ash bricks built in Cement Mortar 1:6, over PCC Concrete Bed of 10mm thick in PCC 1:4:8, Type D-2, using 40mm graded stone aggregate over 150mm thick Hardcore of gauge not exceeding 63mm of broken stones or boulders, deposited, spread and levelled in layers not exceeding 15 cm thick watered and rolled, 100mm thick PCC 1:2:4 Coping, Type B1, using 20mmgraded stone aggregate over top of the Platform / Foundation, rendering to brick surfaces, 15 mm thick in Cement Mortar 1:4, and finishing the top surface even and smooth without using extra cement, applying Three coats of white washing including necessary earthwork excavation, return filling, removal surplus soil complete all as per manufacturer’s recommendations, as specified and as directed.

Earthing complete with Galvanised Steel Earth Plate Electrode 600 X 600 X 6 mm thick burried directly in ground [earth pit not less than 2.25 m deep below ground level] with top edge of Plate not less than 1.50 m below normal ground level connected to 32 X 6mm GI Strip [Earth Lead] and GI pipe 50 mm, Medium Grade for earthing lead protection to the extent of maximum 7.5m, Earth Plate Electrode surrounded by 150mm thick packed layers of Charcoal and Common Salt filled in alternate layers, connected to the Plate by means of GI Bolts & Nuts complete all as per Electrical Plate No. 3 of SSR Part – I, connected to panel / DB including testing on completion including main earthing, Charcoal, Common Salt, PCC [1:2:4, Type B1] Pit with RCC 1:2:4, Type B1 Cover, 50 mm thick with 6 Nos, 8 mm dia TMT bars in both ways, MS frame made with 40 X 40 X 6 mm Angle Iron, MS Funnel with 20 mm bore, medium grade GI Watering pipe, wire mesh, earth work excavation, return filling, removal of surplus soil etc. complete all as specified and as directed.

S & F Earth continuity Conductor or main earthing lead made of GI Strip of size 32 X 6mm, fixed to wall on batten or recess or chases or burried in ground or fixed to poles or any other indicated situation including drawing through GI Pipe for earthing etc. complete all as specified and as directed.

M & L for providing End Termination Joint, Heat Shrinkable type, Indoor type, suitable for 11000 Volts, 3 Core, 120 to 185 Sq.mm, HT, XLPE Insulated, Armoured, Aluminium Conductor cable and testing after jointing complete all as specified and as directed.

M & L for providing End Termination Joint, Heat Shrinkable type, Outdoor type, suitable for 11000 Volts, 3 Core, 240 Sq.mm, HT, XLPE Insulated, Armoured, Aluminium Conductor cable and testing after jointing complete all as specified and as directed.

Supplying, laying and testing HT UG Cable, XLPE insulated, screened insulated, steel strip armoured and pressure extruded PVC bedded, 11000 Volts grade [heavy duty] suitable for Earthed System with aluminium conductor of size 3 Core, 185 Sq.mm conforming to IS – 7098 [Part – II] laid in trenches, fixed to walls or passing through pipes and connecting up complete all as specified and as directed.

Supplying, laying and testing XLPE insulated and PVC sheathed, FRLS, armoured heavy duty underground cable, ISI marked with aluminium stranded conductor 1100 Volt grade of size 3½ Core, 300 Sq.mm cross section suitable for earthed system, laying in trenches / duct / fixed to poles / drawn through pipes / sleeving through pipe in duct, including suitable size Double compression copper stainless steel cable gland, crimping type cable lugs, sockets etc. complete all as specified and as directed.

M & L for Cutting Bituminous Road / Hardstanding etc. as required for Jointing / Laying Cables and Pipeline of width not exceeding 300mm and depth not exceeding 600mm and refilling after laying and making good with PCC 1:2:4, Type B1 using 20mm graded stone aggregate, 100mm thick including removal of surplus soil to a distance not exceeding 50m complete all as specified and as directed.

Supplying and laying GI pipe, 100mm dia, Light grade for cable protection at road crossing etc. or fixing on wall / poles of any type, secured with clamps complete all as specified and as directed.

Excavation in trenches not exceeding 1.5m wide and not exceeding 1.5m deep in Soft / Loose soil for laying Cables etc. complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25cm thick of excavated soil complete all as specified and as directed. Note: A deduction of 10% shall be made from total computed volume of filling to cater in bulk irrespective of machinery used for ramming.

Removal of excavated material [Soil] to a distance not exceeding 50m and depositing where directed at a level not exceeding 1.5 m complete all as specified and as directed.

M & L for Dry River Sand cushioning over and around the cable for cable protection in trenches, levelled and punned down complete all as specified and as directed. Note: The punned down thickness shall be measured for payment.

Supplying and laying un–reinforced Precast Concrete Cable Cover, Class HPV, Type 1, Flat, of size 300mm x 180mm x 40mm complete all as specified and as directed.

M & L for 100 mm thick, PCC 1:2:4, Type B-1, using 20mm graded stone aggregate as in Pavement / Hard standing etc, surface of concrete roads, pavements finished by brooming, laid in alternate bays complete all as specified and as directed.

Taking down carefully the existing Inter Locking Paving Blocks of 60mm thick and relaying the same at the location as directed by the Engineer-in-Charge complete all as specified and directed.

Prasur Electricals & Engineering Co.

M/S SRI VENKATA BHAVANI CONSTRUCTIONS

Power engineering Associates

Roy and Sons Infrastructers

ARCHANA ENGINEERING ENTERPRISES

MONITOR ENGINEERING WORKS