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Control & Relay Protection Philosophy for 400KV KOSAMBA Sub Station

A) Bus Bar Configuration  400kV System : Two Main Bus (1 & ½ ‘I’ type scheme)  220kV System : Three Bus (Two Main and Transfer)  66kV System : Two Bus (Two Main Bus)

  Isolator system400kV System: Five isolator configuration for ½ Dia (One each for Bus &

Line/ICT/Reactor and Three for Tie Bay)220kV System: Four isolator configuration (Three Bus isolators and a Line isolator)66kV System: Three isolator configuration (Two 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

  Line W/o Reactor Bay – 1 Nos.  ICT Bay – 1 No.  Bus Reactor Bay – 1 No.  Tie Bay – 3 Nos.  Bays connected to Bus Bar Protection in first phase - 11 Nos.   Bays to be connected to Bus Bar Protection - 6 Nos.    Future bays – 13 Nos.  Total bays in the Sub Station will be - 30  Bus Bar Protection

o  Control Unit - 24 Bays (Siemens make 7SS52)o  Bay Units - 6 Nos. + 1 No. Spare (Siemens make 7SS523) 

220 KV System

  Feeder Bay – 2Nos.  ICT LV (400/220KV) Bay – 1 No.  Transformer HV (220/66KV) Bay – 2 Nos.  Bays connected to Bus Bar Protection in first phase - 13  Bays to be connected to Bus Bar Protection - 5 Nos.    Future bays – 1 No.  Total bays in the Sub Station will be – 19 Nos.  Bus Bar Protection

o  Control Unit - 24 Bays (Siemens make 7SS52)

o  Bay Units - 5 Nos. 

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66 KV System

  Feeder Bay – 5 Nos.  Transformer LV (220/66KV) Bays – 2 No.  Transformer HV (66/11KV) Bay – 1 No.  Bus Coupler Bay – 1 No.

  Bays to be connected in first phase - 9   Future bays - 3  Total bays in the Sub Station will be - 12

Control Philosophy – KOSAMBA 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 – KOSAMBA Sub Station

A) Transmission Lines Protection

Line Protection Adopted Type of Relay

1 Two Distance Protection[shall be of two different make (i.e.from different manufacturers) or ofsame make with two differentplatforms with same specifications]-Main-I Protection &-Main II Protection

Numerical Relays with IEC61850 Protocol

2 Two Stage Over Voltage Protection- Stage I- Stage II

- Static Relay- Integrated in Main I &

Main II Protection

400 KV Lines

3 Local Breaker Backup (LBB) Protn. Integrated in Main I Protectionand Bus Bar protection

1 Two Distance Protection

[shall be of two different make (i.e.from different manufacturers) or ofsame make with two differentplatforms with same specifications]-Main-I Protection &-Main II Protection

Numerical Relays with IEC

61850 Protocol

2 Two Stage Over Voltage Protection- Stage I- Stage II

Integrated in Main I & Main IIProtection.

220 KV Lines

3 Local Breaker Backup (LBB)Protection.

Integrated in Main I Protectionand Bus Bar protection

1 Directional O/C & E/F Protection Integrated in Bay Control &

Protection Unit (BCPU) with IEC61850 Protocol

66 KV Lines

2 Local Breaker Backup (LBB)Protection.

Integrated in BCPU

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B) Power Transformer Protection

Equipment Protection Adopted Type of Relay

1 Differential Protection Numerical Relay with IEC61850 Protocol

2 Restricted Earth Fault Protection Numerical Relays with IEC

61850 Protocol3 Directional O/C & E/F Protection

(on HV & LV side)Numerical Relays with IEC61850 Protocol

4 Over Fluxing Protection- 400KV side

- 220KV side

-Integrated in DifferentialProtection

- Separate static relay

5 Local Breaker Backup (LBB) Protn.- 400 KV side

- 220 KV side

-Integrated in DifferentialProtection and Bus Bar

protection

-Integrated in Dir. O/C & E/FProtection & Busbar protection

6 Buchholz Relay Integrated in Transformer,

7 Pressure Relief Device Integrated in Transformer

8 Oil & Wdg Temp. Alarm & Tripping Integrated in Transformer

9 OLTC Oil Surge Relay Integrated in Transformer

400/220 KV Transformer

10 Oil Level Low Alarm Integrated in Transformer

1 Reactor Differential Protection Numerical Relay with IEC61850 Protocol

2 Restricted Earth Fault Protection Numerical Relays with IEC61850 Protocol

3 Backup impedance protection Numerical Relays with IEC61850 Protocol

4 Buchholz Relay Integrated in Reactor

5 Pressure Relief Device Integrated in Reactor

6 Oil & Wdg Temp. Alarm & Tripping Integrated in Reactor

400 KV Bus reactor

7 Oil Level Low Alarm Integrated in Reactor

1 Differential Protection Numerical Relay with IEC61850 Protocol

2 Restricted Earth Fault Protection(on HV & LV side)

Numerical Relays with IEC61850 Protocol

3 Directional O/C & E/F Protection(HV side)

Numerical Relays with IEC61850 Protocol

4 Directional O/C & E/F Protection (LVside)

Integrated in Bay Control &Protection Unit (BCPU) with IEC61850 Protocol

220/66KV Transformer

5 Over Fluxing Protection Integrated in DifferentialProtection

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6 Local Breaker Backup (LBB) Protn.- 220 KV side

- 66 KV side

-Integrated in DifferentialProtection and Bus Barprotection

- Integrated in BCPU7 Buchholz Relay Integrated in Transformer

8 Pressure Relief Device Integrated in Transformer

9 Oil & Wdg Temp. Alarm & Tripping Integrated in Transformer

10 OLTC Oil Surge Relay Integrated in Transformer

11 Oil Level Low Alarm Integrated in Transformer

1 Differential Protection Numerical Relay with IEC61850 Protocol

2 Non Directional O/C & E/FProtection- 66 KV side

Integrated in Bay Control &Protection Unit (BCPU) with IEC61850 Protocol

3 Local Breaker Backup (LBB)Protection.

Integrated in BCPU

4 Buchholz Relay Integrated in Transformer

5 Pressure Relief Device Integrated in Transformer

6 Oil & Wdg Temp. Alarm & Tripping Integrated in Transformer

7 OLTC Oil Surge Relay Integrated in Transformer

66/11 KV Transformer

8 Oil Level Low Alarm Integrated in Transformer

C) Bus Coupler Protection

1 Non Directional O/C & E/FProtection

Integrated in Bay Control &Protection Unit (BCPU) with IEC61850 Protocol

66 KVBus coupler

2 Local Breaker Backup (LBB) Protn. Integrated in BCPU

D) Tie Bay Protection

1 Teed Differential Protection - LowImpedance

Numerical Relay with IEC61850 Protocol

400KVTie Bay

2 Teed Differential Protection - HighImpedance

Numerical Relay with IEC61850 Protocol

E) Bus Bar Protection

400 KV Bus bar 1 Augmentation of Existing Siemens

make Bus Differential Protectionscheme (Control unit - 7SS52Bay units – 7SS523)

Numerical Relay with IEC

61850 Protocol

220 KV Bus bar 1 Augmentation of Existing Siemensmake Bus Differential Protectionscheme (Control unit - 7SS52Bay units – 7SS523)

Numerical Relay with IEC61850 Protocol

E) Disturbance Recorder & Event Loggers

Integrated feature of protective relays is used to provide the information about the Disturbance andto log the events.

F) GPS based Time Synchronizing Equipment

Existing SANDS make SYNTIME Global Positioning System based Time Synchronizing Equipment(IEC 61850 compatible)