Common use of Switching Scheme Clause in Contracts

Switching Scheme. The switching schemes, as mentioned below, shall be adopted at various voltage levels of substation/switchyard: 765/400 kV Jamnagar (GIS) One and Half Breaker One and Half Breake Double Main Extension of 400 kV Jam Khambhaliya (GIS) N/A One and Half Breake -- Extension of 765 kV Halvad (AIS) One and half breaker -- -- Notes: - i) For one and half breaker switching scheme, any double circuit line consisting of two numbers of feeders and originating from the same transmission or generating switchyard shall not be terminated in one diameter. ii) Two transformers of the same HV rating shall not be connected in the same diameter and similarly two bus reactors of same HV rating shall also not be connected in the same diameter. iii) A diameter in one and half breaker scheme is a set of 3 circuit breakers with associated isolators, earth switches, current transformers etc. for controlling of 2 numbers of feeders. iv) In case of GIS substation where the bus scheme is One and Half breaker scheme, the diameters shall be complete with feeder/line side isolator and GIS duct of the future bay shall be brought outside the GIS hall/building with extension/interface module suitably. For STATCOM bay, a separate diameter shall be provided, and that diameter shall be complete with GIS bay module suitable for termination of future 400/220 kV ICT. v) Connection arrangement of Switchable Line reactors shall be such that it can be used as Line reactor as well as Bus reactor with suitable NGR bypass arrangement. Further, Spare 1-phase Shunt Reactor unit shall be placed and connected in such a way that the spare unit can be utilized for all the bus and switchable line reactor banks (including future reactor banks) without its physical movement. vi) Space provision for 765 kV and 400 kV, Present as well as Future lines shall be kept considering switchable Line reactor for the lines.

Switching Scheme. The switching schemes, as mentioned below, shall be adopted at various voltage levels of substation/switchyard: 765/400 Extension of 765/400/220 kV Jamnagar Bhuj-II PS (GIS) One and Half Breaker One and Half Breake Breaker Double Main Extension of 400 kV Jam Khambhaliya (GIS) N/A One and Half Breake -- Extension of 765 kV Halvad (AIS) One and half breaker -- -- Notes: -Scheme i) For one and half breaker switching scheme, any double circuit line consisting of two numbers of feeders and originating from the same transmission or generating switchyard shall not be terminated in one diameter. ii) Two transformers of the same HV rating shall not be connected in the same diameter and similarly two bus reactors of same HV rating shall also not be connected in the same diameter. iii) A diameter in one and half breaker scheme is a set of 3 circuit breakers with associated isolators, earth switches, current transformers etc. for controlling of 2 numbers of feeders. iv) In case of GIS substation where the bus scheme is One and Half breaker scheme, the diameters shall be complete with feeder/feeder/ line side isolator and GIS duct of the future bay shall be brought outside the GIS hall/hall/ building with extension/interface module suitably. For STATCOM bay, a separate diameter shall be provided, and that diameter shall be complete with GIS bay module suitable for termination of future 400/220 kV ICT. v) Connection arrangement of Switchable Line reactors shall be such that it can be used as Line reactor as well as Bus reactor with suitable NGR bypass arrangement. Further, Spare 1-phase Shunt Reactor unit shall be placed and connected in such a way that the spare unit can be utilized for all the bus and switchable line reactor banks (including future reactor banks) without its physical movement. vi) Space provision Bus sectionalizer: One (1) set of bus sectionalizer for 220 kV shall comprise two (2) Nos. of bus sectionalizer bays with associated Circuit Breakers, Isolators and Current Transformers for both buses. vii) TSP shall plan distribution of line and transformer feeders to bus bar in such a way that all power can be evacuated successfully without crossing thermal limit at any point of bus-bar. viii) Extension of 765 kV Bhuj-II (GIS): (a) 765 kV bay configurations (one and 400 kV, Present as well as Future lines half breaker scheme) shall be kept considering switchable as follows: ICT- Tie- Bus reactor 1 (one) (b) 400 kV bay configurations (one and half breaker scheme) shall be as follows: ICT (400 kV side of 765/ 400 kV ICT)- Tie- ICT (400 kV side of 400/220 kV ICT) 1 (one) ICT (400 kV side of 400/ 220 kV ICT)- Tie- Line reactor with Switchable Line Reactor (for the linesfuture)* 2 (two) * GIS modules for Line bay and Switchable Line Reactor shall be provided by TSP under present scope. Note: 220 kV Line bays shall be equipped with line side equipment (such as LA, CVT, Wave Trap), gantry, protection panel etc.

Switching Scheme. The switching schemes, as mentioned below, shall be adopted at various voltage levels of substation/switchyard: 765/400 kV Jamnagar South Olpad S/s (GIS) One and Half Breaker half breaker One and Half Breake & half breaker Double Main Extension of 400 765 kV Jam Khambhaliya Vadodara Extn. (GIS) N/A One and Half Breake -- Extension of 765 kV Halvad (AIS) One and half breaker -- -- Notes: ------ ----- (i) For one and half breaker switching scheme, any double circuit line consisting of two numbers of feeders and originating from the same transmission or generating switchyard shall not be terminated in one diameter. (ii) Two transformers of the same HV rating shall not be connected in the same diameter and similarly two bus reactors of same HV rating shall also not be connected in the same diameter. (iii) A diameter in one and half breaker scheme is a set of 3 circuit breakers with associated isolators, earth switches, current transformers etc. for controlling of 2 numbers of feeders. (iv) In case of GIS substation where the bus scheme is One and & Half breaker scheme, the diameters shall be complete with feeder/line side isolator to be used for any future line with switchable line reactor bay and GIS duct of the future bay shall be brought outside the GIS hall/building with extension/interface module suitably. For STATCOM bay, a separate diameter shall be provided, and that diameter shall be complete with GIS bay module suitable for termination of future 400/220 kV ICT. (v) Connection arrangement of Switchable Line reactors shall be such that it can be used as Line reactor as well as Bus reactor with suitable NGR bypass arrangement. Further, Spare 1-phase Shunt Reactor unit shall be placed and connected in such a way that the spare unit can be utilized for all the bus and switchable line reactor banks (including future reactor banks) without its physical movement. (vi) Space provision One (1) set of bus sectionalizer for 765 765kV & 400 kV shall comprise 2 nos. of bus sectionalizer bays with associated Circuit Breakers, Isolators and 400 kVCurrent Transformers for both buses. One (1) set of bus sectionalizer for 220 kV shall comprise 2 nos. of bus sectionalizer bays with associated Circuit Breakers, Present as well as Future lines Isolators and Current Transformers for both buses. (vii) TSP shall plan distribution of line and transformer feeders to bus bar in such a way that all power can be kept considering switchable Line reactor for the linesevacuated successfully without crossing thermal limit at any point of bus-bar.