UP-GRADATION OF 03 IN NOS. 250KW (220V) DC RECTIFIER UNITS 400 KW (200 TO 400 VDC) DC RECTIFIER UNITS AT SUBSTATION-3 OF SOUTH WHARF FOR C.NO. 60, YAS DEPT. AT NAVAL DOCKYARD MUMBAI.

Amount

Opening of Soft patch (RCC Cover), Disconnection and removal of existing 250KW DC rectifier units (Qty-03 Nos) and its accessories from substation -03 for upgradation

Provisioning, factory trials and full load trials at shop floor at ND(MB) of 400KW (200 to 400VDC) DC rectifier units (Qty-03 Nos) meeting following specifications per rectifier unit :- i) Input - 415V (+/-10%), 50Hz(+/-2%), 3 Phase (3 Wire) ii) Output Voltage - 200VDC to 400 VDC Step less iii) Current - 1000AMP iv) Transformer KVA - 2 x 260 KVA Continuous v) Ripple - Less than 3% RMS of rated output at full load and nominal AC input voltage. vi) Control - 2 nos. of 3 phase full wave fully control SCR controlled 12 pulse bridge. Regulation: +/-1% of rated output current from 100Amp to 1000Amp. vii) Indication - Mains ON, Rectifier ON, Charger ON, SCR Fuse fail, Transformer & Devices overtemp. Indicator, single Phase/Phase Failure Indication. viii) Protection - Surge protection for SCR, line Fuse for SCR, Thermostat for over temp. for SCR & Transformer. ix) Cooling - force air cooled by fans. x) Internal Wiring - All wires of LFH (DEF. STANDARD. NES 518 & IS 694 GEN.) Grade multistrand flexible of 1.5/0.5 sq.mm of 1100V grade for internal wiring, with electrolytic annealed grade copper bus bar of adequate rating. xi) Hardware - SS316 grade xii) Main Parts of DC Power Supply - - 3 pole, 1000Amp ACB for input – 03 Nos (01 each) - Main step down Transformers - 06 Nos (02 each) and IPT - 03 Nos (01 each) - SCR Bridge for AC to DC conversion and current control – 06 Nos (02 each) - Filter chokes - 03 Nos (01 each) - 3 pole, 400 Amp MCCB for output – 12 Nos (04 each). - Digital Meters for input & output Voltage & current control – 06 Nos (02 each) xiii) Cable Entry - from the bottom of the cabinet. xiv) IP Protection for Indoor Installation – IP56 xiii) Operating conditions - Max Temp. 50°C Max, Humidity: 95% non Condensing with Max Ambient temp. not occurring simultaneously,

Painting details – Two coats of anticorrosive paints and two coats of epoxy paint (powder coated-spray printing) shade – RAL 7032 (Siemens Grey) for upgraded DC rectifier units (Qty-03 Nos)

Fitment and connectorisation of upgraded rectifier Units (Qty-03 Nos) at Substation-3 of south wharf jetty with associated cabling, accessories and updated wiring diagram

Closing of soft patch (RCC Cover) and waterproofing of the soft patch of substation-3

In-situ trials and commissioning of the DC rectifier units (Qty-03 Nos) as per approved QAP

Transportation charges

Chakshu Enterprise

ADOR DIGATRON PRIVATE LIMITED