SPECIAL REPAIRS / REPLACEMENT OF BER TRANSFORMERS AND HT SWITCH GEARS OF 11 KV CAPACITY AT VARIOUS LOCATIONS AT AFA HYDERABAD

Amount

Dismantling / taking down carefully unserviceable / outlived BER Transformers and VCB Panel Board etc from Sub Station No.2,6 and 10 and transporting to AGE E/M Stores safely complete all as specified and as directed by Engineer-In-Charge. (NOTE :- Quoted rate shall be deemed to be inclusive of dismantling / taking down / loading / transportation and unloading etc to AGE E/M Store Yard)

Supply, install, testing and commissioning of Transformer floor mounted Capacity 400 KVA, Step Down, Indoor Type 11 KV / 0.433 KV,50 Hz, 3-phase AC double copper wound, oil immersed, Oil Naturally Air Naturally (ONAN) cooled with external cooling tubes, transformer delta connection on HV side and star connection on LV side in accordance with vector symbol DyN-11 (vector group 4) and having tapping of + or - 7.5% in equal step of 2.5 % changed by means of off load tap changing arrangement and impedence 4.5%. The voltage regulation shall be as per IS including first fill of transformer oil including all fittings /accessories as specified in SSR Part -I and IS -1180. The transformer should have cable box on both HT & LT side and brass bushing rod on both HT & HT side . The limit of temp rise after continuous full load run as specified in SSR part-I and as per IS -1180 (2014) with total losses should not be more than 1180 W of at 50% and 3330 W at 100% load shall be suitably adjusted to suit the maximum ambient temp prevailing at site all as specified comprising with and including the following specifications:-

(i) Type of connection arrangement :- MS cable termination box on both HT and LT side. Cable box on LT side consisting of 04 Nos porcelain bushing with brass bushing rods and nuts washerwith extended neutral terminal with bushing on the transformer body for terminating earthing strip and suitable for terminating of cable LT 1100 Volt grade XLPE insulated heavy duty Aluminium including gland joint complete

(ii) Cable terminal box HV grade suitable to make termination with 3 core 185/240 sqmm XLPE HT Cable.

(iii) Oil Conservator with filter type drain valve and oil level guage.

(iv) Thermometer Pocket

(v) Two Earthing Terminal on tank body to facilitate fixing of 32x6mm GI strip.

(vi) One No Thermometer Dial type vapour pressure type having range 0-120 degree centigrade with maximum temperature indicator and re-setting device to maximum temperature including needle of temperature gauge : Max reading painted terminal.

(vii) Rating plate with terminal marking plate.

(viii) Oil drain filter valve.

(ix) Oil filling port on top cover with plug.

(x) Air release valve/plug.

(xi) First fill of transformer oil conforming to relevant IS 335.1993 (Fourth revision) and with dielectric strength more than 50 KV

(xii) Inspection cover.

(xiii) Lifting lugs and jack lifting pad support.

(xiv) Explosion vent with double diaphragm and sight glass.

(xv) Silica gel breather or with connecting pipe, first fill of dehydrating agent.

(xvi) Hand hole of sufficient size to assess the interior of the tank.

(xvii) Cover lifting eyes.

(xviii) Oil temperature indicator of approved range, including shut of valve between conservator and main tank.

(xix) Drain valve with threaded adaptor.

(xx) Filter valve with threaded adaptor.

(xxi) Brick Platform of size 2.0m x 2.0m x 2.0m with PCC Bed 1:4:8 ) 150mm thick (1.5 m above Ground Level & 0.5m below ground level)

(xxii) Extra bushing for neutral out side the LV side cable terminal box.

Note: - (i). All routine tests/Pre commissioning tests to be carried out at site after Installation of transformer in presence of Rep of Accepting Officer. (ii).OEM Test certificate shall be furnished by the contractor as per relevant IS. (iii).GA drawing and Design drawing shall be submitted for approval of Accepting Officer before placing Order.

Supply and installation of HT 11 KV, rated voltage 12 KV , 630 Amp 21 KA / 3 Sec indoor type extensible internal arc 21 KA for 1 sec for Tank floor mounted with internal copper busbar , SF6 insulated completely motorized 3 way RMU consisting of 2 Nos LBS as incomer and 01 No 630 Amp VCB as outgoing with SACADA compatable over load and earth fault protection rely (ashidha/scpdr) with air insulated metering module (MFM for VCB feeders) all live parts busbar LBS connections of RMU shall be inclusive in one SF6 tank to avoid multiple inter connections SF6 tahk shall be sealed for life robotically welded non magnetic and non ferrite stainless steel grand 304 min 2.5 mm thick having IP-67 degree of protection filled with SF6 gas has insulation with leakage rate less than 0.1% per year tested as per IEC 62271 200 I No fault passage indicator (FPI) required for complete unit mannual welding or heremetic ceiling of tank shall be not accepted . The unit shall have front cable entry (suitable for termination of 1 hr x 3C 95.120/ 150 Sqmm cable ) for easy of installation and shall have site repalcable bushing for easy of troublshooting during break down . RMU should be completed with all accessories such as terminal boots, VPIS , cable supports , all front cable terminations , mechanical indications load break switch ON/OFF , Manometer as per with IEC standards 62271200 , 60056,60129,60265,60298,60420,60529 & 60694 altitude of installation upto 1000 m as per IEC 60120 bushing bolted type top monitered outside the tank for connections of external busbar also the outer incluses shall cover the full length of the switchgear , to ensure IP3X + IP-54 protection for cable boxes the unit shall be internal arc proof 24 KA for 1 sec with AFLR classsification tested and totally safe for human being. The gas release and personel safety from internal arc shall not dropped on plinth design the release of gas to be from the top the unit . So that even if the person is operating the unit opening the cover and there are personnel near the side of the RMU / plinth top release will ensure their safety.

The hot gas release in case of an internal arc, in No of case should be from any side or bottom of the unit as the same if unsafe for operating personnel / pedesrial or general public. Bidder shall provide type test report to be prove compliance to the internal arc fault IAC-AFLR as per IEC62271-200 internal arc testing shall be done with enclsolure door in open conditions , with switching devise in operations mode as per specified standard RMU Makes :- BHEL /ABB / SIEMENS / ANDREW

(a) 2 Nos Incoming 630 Amps load break switch, triple pole single break 3 position (On, Off and earth having STC capacity 21 KA for 3 seconds with copper busbar and copper earth bar fitted high fixed type voltage indicator device as per IEC 61958-1 fully rated with earth switch, spring assisted mechanism with built in operating handle, arc proof hinged type cable cover air insulated cable boxes and boots suitable for bottom front entry termination of 3 core cable 95/120/185 sqmm. (b) 01 No Outgoing 630 Amps motorised vaccum circuit breaker, triple pole single break 3 position (On, Off and earth having STC capacity 21 KA for 3 seconds with copper busbar and copper earth bar fitted high fixed type voltage indicator device as per IEC61958-1 fully rated with earth switch spring assisted mechanism with built in operating handle, arc proof hinged type cable cover air insulated cable boxes and boots suitable for bottom front entry termination of 3 core cable 95/120/185 sqmm.

(c) Bus connected PT unit-01 No for metering consisting of following:- (i) Type M : Air insulated metering module 12 KV, 630 A 21 KA for 3 sec. (ii) 3 voltage tranformers of the ratio 11KV/1.732/110V/1.732.25VA class 1.0 with HT fuses on primary side and MCB on secondary side.

(iii) 3 Digital MFM with 485 port to measure Amps, Volts, Frequency, PF, KWH, KVAR. (iv) 1 LED bulb for illumination. (v) 1 Space heater with thermostat. (vi) 1 RYB Phase indicator. (vii) 1 Cable support bus bar, stand for 3 Way unit, 1 Manometer & 1 Preraring Handle. (viii) 1 Set bushing for external busbar connection along with bus bar cover & sleeved bus bars for coupling. (ix) 2x12 V Battery with charger of suitable burden for motor operation, input 230 V AC & output 24 V DC. (d) Capacitive Voltage indicator fixed type VPIS 9-15 KV. (e) Necessary inter locking arrangement for safety and operation. (f) One No Operating handle for manual operation. (g) PCC 1:2:4 type B1 using 20mm graded stone aggregate for foundation and bus duct of cable for RMU as per recommendation of manufactures & as directed by Engineer-in-charge. (h) Safety interlocks shall be provided as relevant IEC/IS standard and manufactures directions. (j) Above switchgears shall confirm to all relavant IEC/IS standard.

(k) Manual operation of Vaccum Circuit Breaker should be possible without dismantling the motor from RMU. The motor should be fitted in such a way that it should not be required to dismantle during mannual operation. (l) Coupling of RMU and metering module should be with the help of bolted type arrangement so that the coupling at site shall be easy. Plug in type bushing shall not be acceptable. (m) Minimum 3 Module should be accommodate in one tank to avoid multiple coupling at site. (n) Having following additional facilities:- 1. Trip circuit supervision. 2. Disturbance recorder. 3. Event log with date and time. 4. Measurment and control feature.

(o) Current Transformers (CTs) of dual ratio 50/25-5A of 15 VA output, accuracy class 1.0 for metering instrument and 5P10 for 15 VA accuracy for over cuurent and earth fault protection - sets of 03 Note:- (i) Any other parts/items not specified above but have been considered essential for smooth and safe functioning of the RMU system shall be included in the items and are covered against the quoted rate. (ii) Cable compartment shall be provided at the front side with front bolted type box covers provided with an inspection window for enabling operator to have visual inspection without operating cover in live condition for all incoming and outgoing RMU panels. (iii) Complete with inernal and external connection with each other or as per gound requirement.

Supply, laying & testing of cable HT XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured,electric power cables (heavy duty) with stranded aluminium conductor, 11000 volts grade, of size 3.0 core 185 sq mm complete all as specified and as directed.

Supply and fix cable jointing kit for 11 KV grade cable for indoor termination, heatshrink type, joint complete with jointing material and accessories suitable for 3.0 core XLPE, armoured, Aluminium conductor cable of size150 sqmm to 185 sqmm complete all as specified and as directed.

M & L for Earthing complete with Galvanised Steel Earth Plate electrode 600 mm × 600 mm .× 6.0 mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less'than 1.5 metres below normal ground level, connected to galvanised earth strip 32 mm x 6 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 3 connected to earthing test point all as specified or indicated including testing on completion but using galvanised iron strip 32×6mm as earthing lead ,as earth electrode complete all as specified and as directed.

M & L for Earthing complete with Copper Earth Plate 600 mm × 600 mm × 3.15 mm thick electrode, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less'than 1.5 metres below normal ground level, connected to copper strip 20x3 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 3 connected to earthing test point all as specified or indicated including testing on completion but using copper plate 600 mm × 600 mm ×3.15 mm thick electrode and 20 mm × 3 mm copper strip as earth electrode complete all as specified and as directed.

M & L for Earth continuity Copper Strip 20 mm x 3 mm or main earthing lead fixed to wall with clamps 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 etc. as required complete all as specified and as directed.

M & L Earth continuity Galvanised Iron Strip 32 mm x 6 mm or main earthing lead fixed to wall with clamps 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 etc. as required complete all as specified and as directed.

Supplying and laying Synthetic Rubber Insulated Mats 2.5 mm thick for voltage upto 11 KV for electrical purpose as per IS 15652-2006, (Superseeding IS 5424) suitable for electrical shock safety of sizes 2.0 mtr x 1.0 mtr complete all as specified and as directed

OM SAI POWER SYSTEMS

Roy and Sons Infrastructers

Vardhman Airport Solutions Private Limited

Ashirwad Contractor and Supplier

RAVINDRA BROTHERS

AKSHITA ELECTRICAL

ABM ELECTRICALS

Sri Associates

BHATNAGAR ASSOCIATES

POWER CONSTRUCTION COMPANY