Brief Scope of Work
The bidder's scope of work shall include design, manufacture, shop testing, supply, transportation & complete insurance, handling and storage at site, complete installation, testing and commissioning of 33kV, 11kV & 3.3kV switchgear boards for the auxiliary power supply arrangement of Darlipalli STPP Stage-I (2X800MW). The scope shall also include complete design, engineering, supply, installation, testing and commissioning and AMC (Three Years) of the Switchgear SCADA System & Fast Bus Transfer System.
Salient Technical Features
The short-time fault withstand rating for of the switchgears voltage rating upto 11kV shall be 40kA (RMS) for one second and the dynamic withstand rating shall be 100kA (peak).
The switchgear boards shall have a single front, single tier, fully compartmentalized, metal enclosed construction complying with clause No. 3.102 of IEC 62271-200, comprising of a row of free standing floor mounted panels. Each circuit shall have a separate vertical panel with distinct compartments for circuit breaker / contactor truck, cable termination, main busbars and auxiliary control devices. The Service Class Continuity of Switchgears shall be LSC 2B-PM (as per IEC 622771-200). The Circuit Breakers / Contactors / Bus VTs shall be mounted on withdrawable trucks which shall roll out horizontally from service position to isolated position. The Switchgear shall have an Internal Arc Classification of IAC FLR 40kA 1 sec.
The Circuit Breakers / Contactors shall be of Vacuum type.
The Switchgear SCADA system shall be an integrated system for protection, control (except motor feeders), measurement and monitoring of all MV & LV circuit breakers / vacuum contactors in the Auxiliary Power Supply network. The system shall have communicable numerical relays complying with IEC-61850 on all feeders which shall be networked on Ethernet to form the Switchgear SCADA. The system shall have a distributed architecture with multiple Data Concentrators and HMI Stations interconnected through the Station LAN. The Switchgear SCADA shall be so designed as to provide fast, safe and reliable control of the Auxiliary Power Supply system along with online monitoring and data acquisition.
Fast Bus Transfer Systems for 11kV Unit Switchgears shall be provided with Fast, In-phase & Slow changeover facilities. For 3.3kV the systems shall have In-phase & Slow changeover facilities.
To achieve the above, the Bidder's scope of work shall include complete design, engineering, supply, installation, testing and commissioning and AMC (Three Years) of Communicable Numerical Relays, Data Concentrators, LAN Network along with Ethernet Switches, HMI stations (with Engineering work stations and printers), Fiber Optical cables, GPS and Laptops, any other equipment required to the intended specification. Integration of Numerical relays in LT Switchgears being procured by the Employer under other packages and interfacing with Employer's DDCMIS on OPC shall also be in the bidder's scope. All the relays & associated equipment shall be capable of communicating over IEC-61850 communication protocol.