82602/E8 Special Repair / Replacement to BER Transformers and connected E/M works at Af stn Sulur (Phase-l)

Amount

Supply installation, testing and commissioning of transformer, outdoor type step down 11/0.433 KV, HT with 3 phase and LT with 3 Phase, 4-wire system double copper wound with Off Circuit Tap Changer arrangement on HT side for a variation of secondary voltagewith tapping range + 5% to -10% in steps of 2.5 % continious rating of 500 KVA (Energy efiicent not less than Level-II) confirming to IS: 1180 (Part 1):2014 & other latest IS codes, Oil - IS: 335: 1993 including first fill of Oil,making incoming and outgoing connection to Transformer with copper conductor with lugs & glands complete, mounting on exisitng plinth complete all as specified and directed. Make ESSENAR/CG/ABB/Scheindier or any technco commercial equivalent make listed Ein C/HQ SC approved list The quoted rates shall deemed to include the following :-

Temp. Rise in Oil [Degree C.] : as per IS, By Resistance [Degree C.] : as per IS, Ambient temperature : as per IS, Winding Material : Double wound Copper Type of Cooling : ONAN, Class of Insulation : Class “A”, Vector Group : Dyn11, Frequency [Hz.] : 50, Phase : 3, Insulation Level [kV/Kvp] H.V. : 28kV,L.V. : 3kV, Primary Connection [HV] : Delta, Primary Volts : 11000V,Primary Phases : 3 Primary Wires : 3,Primary rated current : Approx 26 Amps, Secondary Connection [LV] : Star,Secondary Volts : 433V,Secondary Phases : 3, Secondary Wires : 4, Secondary rated current : Approx 666 , Taps on Primary /Secondary Winding for : +7.5% to –7.5% in steps of 2.5%, Primary /Secondary Voltage Variation Off Circuit Tap Changer, No. of switch positions : 7 Terminal Arrangement H.V. : Bare Bushings/Cable box, L.V : Bare bushings /Cable Box, Load Losses (Level-II) At 50% Loading : As per IS in Watts (Max.) At 100% Loading : As per IS in Watts (Max.) Impedance (Z) [Percentage], HV - LV : not more than 5% No Load Current (% of Rated Current) :As per IS

Weights & Dimensions (Approx.) 1) Core & Windings with clamps (Untanking Weight) : As per IS Specifications 2) Tank & Fittings :As per IS Specifications 3) Oil :As per IS Specifications 4) Total Weight : .As per IS Specifications Overall dimensions of the transformer (mm) Length :width :As per IS Specifications Height : As per IS Specifications HV - LV Orientation : 180 deg. Bushing - as per latest IS Porcelain Bushings HV : 3 Epoxy Bushing LV : 4 Painting [Finish] : PU Light Grey Shade No. 631 – IS: 5

TESTS - Routine Tests as per IS: 1180 (Part 1):2014 1) Ratio test 2) Polarity 3) Phase angle error measurement 4) I R Values 5) Winding resistance 6) Open circuit test 7) Short circuit & Impedance test 8) Separate source voltage test 9) Induced over voltage test 10) Vector group test 11) BDV of Oil like etc..

STANDARD FITTINGS AND ACCESSORIES: 1) Rating & Terminal Marking Plate - One 2) Earthing Terminals- Two 3) Lifting Lugs -Two 4) Drain Valve with blanking plate - One 5) Filter Valve with blanking plate - One 6) Conservator - One 7) Conservator Oil filling hole with cap - One 8) Oil Level indicator with min. marking - One 9) Dehydrating Breather filled with silica gel- One 10) Conservator Drain Plug - One 11) Air Release Device - One 12) Thermometer Pocket - One 13) Pressure relief valve - One 14) Roller Uni directional - Four 15) Radiators As per IS 16) Bare Bushings/Cable box HV -As per IS 17) Bare Bushings/Cable box LV - As per IS 18) Separate Neutral Terminal -One 19) Off Circuit Tap Changer - One 20) thermometer - One 21) Buchholz relay-One

Note:- (i) The Studs for neutral & body shall be sufficeiently long to fix 2 Nos GI strip for earthing. (ii) Cost of Cable entry boxes/Bare bushing on both sides shall be deemed to be included in quoted rates.

Supply,install,commissioning and testing the following vaccum circuit breakers 11kV,3-ph 50hz,totally enclosed metal clad switch gear type tested compisite panel confirming to IS,factory made powder coated board with vaccum circuit breaker floor mounted with common bus buar complete all as specifed

(x) Volt coil to trip the VCB on failure of electric supply (xi) One nurical processor relay for Over Current & Earth fault relay power, under/over voltage, directional over current ,under/over frequency,CB fault detection, VT/CT supervision, all rms measurment as recommed by OEM. (xii) Master trip electro mechanical relay, Single element high speed tripping relay with hand rest contacts. (xiii) Strip heater,thermo stator with swtich for space heating (xiv) Proviosn AC/DC voltage source required for tripping system with suitable power back up including provision of siren/horon alaram and accept switch as recommeded by OEM. (xv) Provision for charging of spring charge motor with operated voltage as recommended by OEM. (xvi) Annuiceator complete with showing type of fault,accept and reset button with OEM recommended windows. (xvii) quoted rated deemed to be inclusive of pcc foundation , coping and wahite wash etc.

Supply and laying in trenches/through pipes or bare in road crossings/paths/ drains/ ducts/ floors/along poles/equipments/trenches etc. Cable Under ground, cross linked poly-ethylene (XLPE) insulated, screened, PVC bedded, galvanised steel strip armoured, electric power cables with aluminium conductor, earthed,11 KV grade, of cross sectional area 185 Sqmm x 3 core laid including all necessary end terminations,all cable glands, nuts bolts as required complete all as specified.

Supply and laying in trenches/through pipes or bare in road crossings/paths/ drains/ ducts/ floors/along poles/equipments/trenches etc. Cable Under ground, cross linked poly-ethylene (XLPE) insulated, screened, PVC bedded, galvanised steel strip armoured, electric power cables with aluminium conductor, earthed,1.1 KV grade, of cross sectional area 240 Sqmm x 3.5 core laid including all necessary end terminations,all cable glands, nuts bolts as required complete all as specified.

Supply and installation of Earthing with Galvanised Earth Plate Electrode 600x600x 6mm thick burried directly in Ground (Earth Pit not less than 2.25 Metre below Ground Level) with Top edge of the Plate not less than 1.50 Metre below Ground Level, connected with Galvanised Earth Strip of size 32x6 mm (upto 7.50mm length) by means of Bolts, Nuts, Check Nuts and Washers of GI or Steel and connected Earthing Testing Point/Bus-bar including GI 40mm bore light grade Protection Pipe, Earth Plate surrounded by a packed thickness of Char Coal or Coke Dust mixed with Common Salt, Magneisum Sulphate (1 : 1 : 0.5) in alternate layers of not exc 150mm thick, PCC Pit in Cement Concrete 1:3:6 (20mm graded stone aggregate) and Pre-cast RCC Cover Slab of size 350x350x50 mm in Cement Concrete 1:2:4 (20mm graded stone aggregate), reinforced with 10mm dia TMT Bars @ 100mm Centre to Centre in both ways, GI Wire Mesh, Funnel with GI Watering Pipe 20mm bore medium grade including necessary Excavation in any type of soil, Returning, Filling and Removal of surplus Spoil disposal to out side MD land and all as shown in Electrical Plate No. 3 of MES Schedule Part-I and Testing on Completion including taking down old unserviceable one, complete all as specified and as directed.

Note for Item No 5:- (a) All Joints should be joined by tight nut/bolts. (b) After completion of work earthing shall be tested by the contractor in presence of JE/ Engineer-in-Charge, User and proper record shall be maintained duly signed by all concerned. (c) Earth resistance tester shall be provided by the contractor. It should be caliberated from authorised company/ lab. (d) After testing if desired earth resistance of less than 5 Ohm is not obtained, the earthing will be redone at no extra cost to Govt till desired result is obtained.

Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop[ earthing of GI strip 32x6mm

Boring of holes under road, pavement, hard standing by trenchless technology using ultra sounding technique and necessary machine including HDPE pipe of 150 mm dia suitable for 0.4 mpa working pressure

M&L Out door cable end jointing kit (Heat shrinkable) suitable for XLPE under ground aluminium conductor cable, 11 KV (Earthed) grade, of cross sectional area 185 Sqmm 3 core complete all as specified and as directed.

M&L for disconnecting all electrical mechnical connections of existing trasnformer and deposit to store yard GE AF sulur

M&L for disconnecting all electrical mechnical connections of existing VCB and deposit to store yard GE AF sulur

Excavation in trenches not exceeding 1.5 mtr wide and not exceeding 1.5 mtr depth for foundation, laying of poles in trenches and getting out in hard/dense soil complete all as specified

Returning, filling including spreading, levelling, watering and well ramming in layers not exceeding 25 cms thick complete all as directed by Engineer-in-Charge.

Removal of surplus soil to a distance no exceeding 50 mtrs and depositing where directed at a level not exceeding 1.5 mtrs above from the starting point complete all as directed by Engineer-in-charge.

Riddling Sand obtained from excavation for cable protection 8cm under the cable and 15cm above the cable in trench and get the thick layer of 18cm after ramming complete all as specified and as directed.

M&L in Un-reinforced precast concrete cable cover class HV Type 1, flat size 300mm x 180 mm x 40 mm thick complete all as specified and as directed.

M&L in Un-reinforced precast concrete cable cover class Class LV, Type I, flat, size 250 mm x 150mm x 40mm thick complete all as specified and as directed.

eurekaenterprises (BID ID -3444173)

Neptune Engineers and Builders (BID ID -3442995)

shalom constructions (BID ID -3442150)

Veera Electrical (BID ID -3443697)

KUMAR AGENCIES (BID ID -3443893)

LAKSHMI ELECTRICAL ENTERPRISES (BID ID -3449437)