Tender Document for Construction of Ghorasal 300-450 MW ... - BPDB

The auxiliary for the gas turbine generating set and the steam turbine generating
set shall be fed through either the unit auxiliary transformer or the
station transformers. The unit auxiliary transformer shall step generator
voltage down to 6.6 kV to feed the auxiliary equipment.. The station transformers
shall step the medium voltage of 6.6 kV down to 415/230 to feed
gas turbine generator unit MCC and the heat recovery steam generator
MCC and steam turbine generating unit MCC and common station load.
The motor control centers shall contain all the motor starters and circuit
breakers to supply the low voltage auxiliaries of the gas turbine generating
units, the steam turbine generating unit and the heat recovery steam generators.
Electrical installation materials shall be chosen for power plant service including
lighting, lighting transformers, panel boards, switch's, outlets, receptacles,
power and control cable, conduit, conduit elbows, bushings,
couplings, lockouts, cable trays, wire ways, pull boxes, floor ducts, junction
boxes, cable accessories, copper bar and ground rods connections, and
various devices for the safe operation of the system.
A main ground grid made up of copper conductor and an adequate number
of driven ground rods to give a low grounding resistance shall be provided.
The power and control, cable provided shall be constructed with insulation
and jacketing in accordance with the latest IEC standard.
3.5 Functional Requirements
3.5.1 General
3.5.2 Controls
Combined cycle shall be designed for operation as a base load generating
unit. The gas turbine unit shall also be suitable for peak load operation as
well as base load plant.
The combined cycle generating plant shall be capable of semi-attended
operation under local unit control, and shall also be capable of remote control
from the central control room within the site area. The automatic startup
and shut down sequences shall be initiated by DCS either from the local
control room or the central control room. Synchronisation shall be automatic
with provision for local and remote manual control.
3.5.3 Cooling system
3.5.4 Noise Levels
The units shall be designed for water cooling of the condenser, lubrication
oil system, etc. The cooling system for generator shall be closed cycle cooling
water and air cooling system.
The Noise level shall be as per Annexure-4.
3.5.5 Vibration Severity
Vibration severity of the units shall not exceed 8.0 mm/sec. In normal op-
Ghorasal 300-450 MW CCPP Project (Vol-2A of 2) 40