Supply, Installation, Testing and Commissioning of 1000 kVA transformer with one no. LT breaker, removal of existing 315kVA transformer and other associated work at Sector -137 metro station

Amount

GENERAL DESCRIPTION

Transformer should be type tested and the report should not be more than 5 years old. Transformer shall also comply with standards in force when the transformer is manufactured, particularly IEC 60076, Latest version, IS 2026; Latest version and IS 11171/1985. Maximum size available(L-2600mm, W-2000mm, H-2550mm)

Augmenting existing LV Panel of M/s Neptune make, shall strictly be as per IEC-61439. The additional cubicle being made for housing 800 Amps, 415V ACB shall have Type tested design as per IEC-61439. The cubicle shall pass the internal arc fault containment test in accordance with IEC 61641 for fault current rating of 50 kA for 0.3 seconds. Panel augmentation & modification shall be minimum complying form 4b-type5 design. The colour of cubicle shall have the same RAL code as existing LV Panel. LT panel bus bar shall be capable of withholding the mentioned rated and fault current, the same shall be type tested as per IEC-61439 and temperature rise as per IEC 60890.

Statutory sanctions such as E.I.G. clearance shall be under the scope of contractor. Application for grant of EIG shall be sent after performing the site test reports as per relevant IS/IEC.

Type test certificate shall not be more than 5 year old of any equipment.

The work/Equipment shall be in compliance of particular specification & BOQ.

The manufacturing clearance of transformer shall be given after GTP approval by Engineer- in charge and dispatch clearance shall be given after satisfactory completion of FAT.

The contractor shall submit the design documents for Augmentation of LV Panel such as GAD control wiring drawing and other relevant certificates. The augmentation clearance shall be given after approval of design documents.

The contractor shall provide fault discrimination chart after augmenting LV Panel.

TRANSFORMER

SITC of Cast Resin Dry Type, 1000KVA, 33/0.415kV, 3 Phase, 50Hz, Dyn11 vector Group, Aluminium wound, Air Natural Cooling, Class F insulation associated with winding Temperature indicator/controller actuated by means of resistance temperature detector embedded in LV windings, indoor type Transformer with Approximately 6% impedance, OFF load tape changer, tapping on HV side in steps @0, +2.5% and +5% voltage range, having cable end termination on HV side suitable for 3X1Cx95 Sqmm copper XLPE cable of 33KV grade and LT Cable termination of 4Rx3.5Cx240Sqmm armoured Aluminium conductor cables on L.V. side with neutral bought out separately including supplying and laying of copper conductor multicore control cable from Transformer to HT Breaker for safety tripping and the magnetic circuit of transformer shall be in low loss oriented -grain silicon steel sheet. The connection with different terminals of transformer shall be through C-Type or suitable connector for sufficient clearances from transformer windings. HV connections of transformers shall be connected through insulated cables. HV terminals shall have suitable arrangement to provide sufficient clearance to 33 kV cables from the transformer windings. Transformer shall be fitted with a temperature protection system that allows winding temperatures to be monitored (this shall consist of two sensors placd on each low voltage winding; one alarm sensor and one trip out sensor). The transformer may be supplied in cubicle with enclosure without any HV portion exposed. The door shall be provided with a mechanical system interlock (Castle lock & key type). Transformer fire protection scheme shall cover supply, installation, testing and commissioning of automatic clean agent flooding system cosidering the following when computing volume to verify suitability and to establish design limitations complete for dry type transformer. *Volume of hazard area *Specific volume of clean agent *Discharge time and flow rates *Design concentration and design factors *detector/discharge tubing placement gas flooding of 4.2 percent cleaning agent concentration by volume as per NFPA- 2001 along with FACP and should have inetrface with main control fire alarm system. Approved make of transformer- M/s ABB / M/s RAYCHEM or equivalent.

1000KVA Transformer as described above

HT CABLES

Supply & laying of 33 kV grade 3x1Cx95 sqmm Copper XLPE insulated PVC sheathed cable as per attached GTP.

Termination of above cable at GIS end

Termination of above cable at Transformer end

MODIFICATION IN EXISTING MAIN DISTRIBUTION PANEL (INDOOR TYPE) - Neptune Make

Incoming from Transformer (1000KVA) :- 1Nos. In existing enclosure.

1Nos. Motor wound spring closing mechanism

1Nos. Microprocessor release PR122 (EMI & EMC Certified) for over current, earth fault & short circuit protection, instantaneous fault

3Nos. CT's for APFCR relay

1Nos. Undervoltage Release

Castle Lock & Key arrangement on Panel

SCADA integration incorporating signals specified as per specifications.

Shifting of Existing 800A ACB to New Enclosure

Installation, Testing & commissioning of new enclosure of size W600xH2125xD800 and shifting of existing 800A ACB with following accessories

The cotractor shall also incorporate the existing clean agent based fire suppression system in its entire cubicle.

1Set. Phase indicating lamps suitable for 230 V AC fittings with back up hrc fuse/MCB.

4Nos. Breaker ON/OFF/TRIP/'Spring Charged', indicating lamps.

1Nos. T-N-C breaker control switch . (Trip/Neutral/Close)

3Nos. CT's for APFCR relay

1Nos. Undervoltage Release

3 Nos. Metering CT (800/5A, CL-0.5, 15VA)

SECURE/L&T make energy meter of 0.5s class

Having provision for SCADA integration for signals as per specifications.

Replacement of Horizontal Bus Bars

Existing Tinned Copper Busbasr of 630A (size 2x40x10)mm shall be replaced with 1600A (Size 2 x 60x 10)mm for LHS part up to buscoupler section. Bus bars shall be colour coded and insulated by heat shrinkable sleaves & clip on shrouds for joints.

Note:- Work shall complete with interlocking of new Incoming Breaker with Buscoupler and Other incomer with necessory changes in control wiring. The existing LV panel is manufactured acc. To IEC 61439-1, the new cubical shall also having type tested certificate as per IEC 61439-1.

LT CABLES:

Supply and laying of 3.5C, 240 sqmm Aluminium XLPE insulated, 1100 V grade armoured FRLSH aluminium cable on existing cable tray including supports, clamps and dressing in all respect etc.

Supply & Termination of above cable having bimetallic lug (Cu-Al).

Supply & Termination of above cable having Aluminium lug.

EARTHING

Providing and fixing of 50x6 sqmm GI flat strip for connection on surface or in recess for connections as required.

Dismantling existing 315kVA transformer and its transportation from Sec-137 metro station to RS depot.

Budhiraja Electricals

Power and Instrumentation Guj. Ltd.

Himalaya Generators