LT Switchgears & LT Busducts Package for Darlipalli STPP Stage-I 2X800MW)
Switchgear and LT Busducts package for Darlipalli STPP Stage-I (2X800MW).
and LT Busducts as detailed in the bidding document No.CS-9549-206-2 for LT
B. Salient Technical Features
storage at site, complete installation, testing and commissioning of entire LT Switchgears
the site and inland transit insurance, delivery at site, receipt, unloading, handling and
The scope includes design, manufacture, shop testing, packing, inland transportation to
A. Brief Scope of Work
All switchboards shall be of metal enclosed, indoor, floor-mounted, free-standing type of
The reference ambient temperature is 50 C for all the equipment.
each comprising of busbar compartment, switchgear / feeder compartment, cable
compartment or cable alley and control compartment. Entire busbar system shall be
bolted design. All switchboards shall be divided into distinct vertical sections (panels),
second and the Dynamic withstand rating shall be 105kA (peak).
The short-time fault withstand rating of the switchgears shall be 50kA (RMS) for one
0
insulated with PVC sleeves. Cable terminations located in cable alley shall be designed
The Circuit Breakers / Contactors shall be of air break type & should conform to the
“Service” and “Test” positions.
to meet the Form IV b Type 7 (as per IEC 60439) for safety purpose. The termination for
each module shall have its own integral glanding facility.
requirements of IS / IEC 60947. MCCB shall be provided for 100A, 125A, 160A, 250A &
The circuit breaker will normally be controlled from remote control panels (employer’s
controlled.
400A supply feeders. The motor feeders for 110kW & above shall be Air Circuit Breaker
All ACDBs, DCDBs & Solenoid Valve DBs shall be of Fixed Module type. All 415V Circuit
breaker modules and MCC modules shall be of fully draw out type having distinct
on IEC 61850 to communicate with the data concentrator through LAN. The auxiliary
contacts of the MCCB shall be fed to the digital inputs available in the numerical relays
possible from the switchgear SCADA system. All the protective relays associated with
Control, Metering and Status monitoring. All the numerical relays shall have
the Circuit breaker modules shall be of Numerical communicable type for Protection,
DDCMIS) through closing and shunt trip coils. The control of the breakers shall also be
of Incomer / bus coupler / motor circuit breaker feeders, for integration into the numerical
relay network. The vendor’s scope includes Numerical relays, Ethernet switches, Data
cables and Laptops (for programming of Numerical relays) for the above purpose.
communications on three ports, local front port communication to laptop and dual ports