Control & Relay Protection Philosophy for 400KV HALVAD Sub Station
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GETCO / E / 4S-065/ PP - 017 – 1A / R0 Dt.09.06.2011 Control & Relay Protection Philosophy for 400KV HALVAD Sub Station A) Bus Bar Configuration 400kV System : Three Bus (Two Main and Transfer) 220kV System : Three Bus (Two Main and Transfer) 66kV System : One Bus (One Main Bus) Isolator system 400kV System : Four isolator configuration (Three Bus isolators and a Line isolator) 220kV System : Four isolator configuration (Three Bus isolators and a Line isolator) 66kV System : Two isolator configuration (One Bus isolators and a Line isolator) B) Control Voltage 220V DC C) Control & Relay panels Control & protection Panels to be mounted in Yard Kiosk D) PLCC panels PLCC Panels to be mounted in Control Room PLCC BCU panel to be mounted in Control Room for interface between Control & protection Panels and PLCC Panels, through GOOSE commands E) Nos. of Bays & Bus Bar Protection 400 KV System Feeder Bay – 8 Nos. ICT Bay – 2, Bus coupler Bay - 1, Transfer Bus Coupler Bay - 1 Bus Reactor Bay - 1, Bays to be connected to Bus Bar Protection in first phase - 13 Future bays - 5 Total bays in the Sub Station will be - 18 Bus Bar Protection o Control Unit - 24 Bays o Bay Units - 13 Nos. + 1 No. Spare 220 KV System Feeder Bay – 6 Nos. Transformer Bay – 3, Bus coupler Bay - 1, Transfer Bus Coupler Bay - 1 Bays to be connected to Bus Bar Protection in first phase - 11 Future bays - 9 Total bays in the Sub Station will be - 20 Bus Bar Protection o Control Unit - 24 Bays o Bay Units - 11 Nos. + 1 No. Spare Page 1 of 4 GETCO / E / 4S-065/ PP - 017 – 1A / R0 Dt.09.06.2011 66 KV System Feeder Bay – 6 Nos. Transformer Bays – 1 No. Bays to be connected in first phase - 7 Future bays - 3 Total bays in the Sub Station will be - 10 Control Philosophy – HALVAD Sub Station System Controlling Device to be Adopted Type of Controlling Device 400 KV Bay Bay Control Unit BCU with IEC 61850 Protocol 220 KV Bay Bay Control Unit BCU with IEC 61850 Protocol 66 KV Bay Bay Control & Protection Unit BCPU with IEC 61850 Protocol PROTECTION PHILOSOPHY – HALVAD Sub Station A) Transmission Lines Protection Line 400 KV Lines Protection Adopted Type of Relay 1 Two Distance Protection Numerical Relays [shall be of two different make (i.e. 61850 Protocol from different manufacturers) or of same make with two different platforms with same specifications] -Main-I Protection & -Main II Protection with IEC 2 Two Stage Over Voltage Protection - Stage I - Static Relay - Stage II - Integrated in Main I & Main II Protection 3 Local Breaker Backup (LBB) Protn. Integrated in Main I Protection and Bus Bar protection 220 KV Lines 66 KV Lines 1 Two Distance Protection [shall be of two different make (i.e. from different manufacturers) or of same make with two different platforms with same specifications] -Main-I Protection & -Main II Protection 2 Two Stage Over Voltage Protection - Stage I - Stage II 3 Local Breaker Backup (LBB) Protection. 1 Directional O/C & E/F Protection Numerical Relays 61850 Protocol with IEC Integrated in Main I & Main II Protection. Integrated in Main I Protection and Bus Bar protection Integrated in Bay Control & Protection Unit (BCPU) with IEC 61850 Protocol Page 2 of 4 GETCO / E / 4S-065/ PP - 017 – 1A / R0 Dt.09.06.2011 2 Local Breaker Backup (LBB) Protection. B) Power Transformer Protection Integrated in BCPU Equipment 400/220 KV Transformer Protection Adopted 1 Differential Protection Type of Relay Numerical Relay 61850 Protocol 2 Restricted Earth Fault Protection 3 Directional O/C & E/F Protection (on HV & LV side) 4 Over Fluxing Protection - 400KV side with IEC Numerical Relays 61850 Protocol with IEC Numerical Relays 61850 Protocol with IEC -Integrated Protection in Differential - Separate static relay - 220KV side 5 Local Breaker Backup (LBB) Protn. - 400 KV side -Integrated in Differential Protection and Bus Bar protection - 220 KV side 400 KV Bus reactor 6 7 8 9 10 1 -Integrated in Dir. O/C & E/F Protection & Busbar protection Buchholz Relay Integrated in Transformer, Pressure Relief Device Integrated in Transformer Oil & Wdg Temp. Alarm & Tripping Integrated in Transformer OLTC Oil Surge Relay Integrated in Transformer Oil Level Low Alarm Integrated in Transformer Reactor Differential Protection Numerical Relay with IEC 61850 Protocol 2 Restricted Earth Fault Protection 3 220/66KV Transformer 4 5 6 7 1 2 3 4 5 Numerical Relays with IEC 61850 Protocol Backup impedance protection Numerical Relays with IEC 61850 Protocol Buchholz Relay Integrated in Reactor Pressure Relief Device Integrated in Reactor Oil & Wdg Temp. Alarm & Tripping Integrated in Reactor Oil Level Low Alarm Integrated in Reactor Differential Protection Numerical Relay with IEC 61850 Protocol Restricted Earth Fault Protection Numerical Relays with IEC (on HV & LV side) 61850 Protocol Directional O/C & E/F Protection Numerical Relays with IEC (HV side) 61850 Protocol Directional O/C & E/F Protection (LV Integrated in Bay Control & side) Protection Unit (BCPU) with IEC 61850 Protocol Over Fluxing Protection Integrated in Differential Protection Page 3 of 4 GETCO / E / 4S-065/ PP - 017 – 1A / R0 Dt.09.06.2011 6 Local Breaker Backup (LBB) Protn. - 220 KV side -Integrated Protection protection in and Differential Bus Bar - 66 KV side - Integrated in BCPU Buchholz Relay Integrated in Transformer Pressure Relief Device Integrated in Transformer Oil & Wdg Temp. Alarm & Tripping Integrated in Transformer OLTC Oil Surge Relay Integrated in Transformer Oil Level Low Alarm Integrated in Transformer 7 8 9 10 11 C) Bus Coupler Protection 400 KV 1 Non Directional O/C & E/F Numerical Relay with IEC Bus coupler Protection 61850 Protocol 2 Local Breaker Backup (LBB) Protn. Integrated in Non Dir. O/C & E/F Protection and Bus Bar protection. 220 KV 1 Non Directional O/C & E/F Numerical Relay with IEC Bus coupler Protection 61850 Protocol 2 Local Breaker Backup (LBB) Protn. Integrated in Non Dir. O/C & E/F Protection and Bus Bar protection. D) Bus Bar Protection 400 KV Bus bar 1 Bus Differential Protection Numerical Relay with IEC (Single scheme) 61850 Protocol 13 Bays, Extendable upto 24 Bays (i. e. Control Unit - 24 Bays) 220 KV Bus bar 1 Bus Differential Protection Numerical Relay with IEC (Single scheme) 61850 Protocol 11 Bays, Extendable upto 24 Bays (i. e. Control Unit - 24 Bays) E) Disturbance Recorder & Event Loggers Integrated feature of protective relays is used to provide the information about the Disturbance and to log the events. F) GPS based Time Synchronizing Equipment The Sub station is to be provided with Global Positioning System based Time Synchronizing Equipment to synchronize all the protections. Page 4 of 4
