Control Relay Protection Philosophy

GETCO / E / 2S-113 / PP - 015 – 1A / R0 Dt.19.11.2011

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Control & Relay Protection Philosophy for 220 KV POPDA Sub Station

A) Bus Bar Configuration

� 220 KV System: - Two Bus (One Main and One Main cum Transfer bus) � 132KV System: - Single Bus � 66 KV System: - Two Bus (Two Main bus)

� Isolator system

220 KV System: - Four isolator configuration (Three Bus isolators and a Line

isolator) 132KV System: - Two isolator configuration (One Bus and a Line Isolator) 66 KV 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 / FOTE Panels to be mounted in Control Room � PLCC / FOTE BCU panel to be mounted in Control Room for interface between

Control & protection Panels and PLCC Panels, through GOOSE commands

E) Nos. of 220 KV Bays

� Feeder Bay – 4 Nos. � Transformer Bay – 4 Nos. � Bus coupler Bay - 1 No � Total No. of Bays planned in first phase– 9 Nos. � Future Bays – 02 Nos. � Total Bays Planned – 11 Nos. � Bays to be connected to Bus Bar Protection in first phase - 9 Nos. � Bus Bar Protection

– Control Unit (Central Unit) - 24 Bays – Bay Units (Peripheral Unit) - 9 Nos. + 1 No (to be kept as spare)

F) Nos. of 132 KV Bays

� Feeder Bay – 2 Nos. � 220/132KV Transformer LV Bay – 2 No. � Total Nos of Bays planned – 04 Nos.

G) Nos. of 66 KV Bays � Feeder Bay – 6 Nos. � 220/66KV Transformer LV Bay – 2 No � Station Transformer Bay – 1 No. � Bus Coupler Bay – 1 No. � Total Nos of Bays planned – 10 Nos.

GETCO / E / 2S-113 / PP - 015 – 1A / R0 Dt.19.11.2011

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Control Philosophy – POPDA Sub Station

System Controlling Device to be Adopted Type of Controlling Device

220 KV Bay Bay Control Unit BCU with IEC 61850 Protocol

132 KV Bay Bay Control Unit BCU with IEC 61850 Protocol

66 KV Bay Bay Control & Protection Unit BCPU with IEC 61850 Protocol

Protection Philosophy – POPDA Sub Station

A) Feeder Protection

Feeder Protection to be Adopted Type of Relay

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

Numerical Relay with IEC 61850 Protocol

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

Integrated in Main I & Main II Protection

220 KV Feeders

3 Local Breaker Backup (LBB) Protection.

Integrated in Main I Protection and Bus Bar protection

1 Distance Protection


2 Directional O/C & E/F protection (Backup protection)


132 KV Feeders


Integrated in Distance protection and Backup protection

1 Line Differential Protection* with inbuilt fault locator

Numerical Relay with IEC 61850 Protocol. *Note:- End to end communication for Differential relays will be through Fiber Optic.

2 Directional O/C & E/F protection (Backup protection)


132 KV Feeders (Short Lines)


Integrated in Line Differential protection and Backup protection

1 Directional O/C & E/F Protection

Integrated in Bay Control & Protection Unit (BCPU) with IEC 61850 Protocol

66 KV Feeders


Integrated in BCPU

GETCO / E / 2S-113 / PP - 015 – 1A / R0 Dt.19.11.2011

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B) Power Transformer Protection

Equipment Protection to be Adopted Type of Relay

1 Differential Protection Numerical Relay with IEC 61850 Protocol

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

Numerical Relays with IEC 61850 Protocol

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


4 Directional O/C & E/F Protection (LV side)


5 Over Fluxing Protection Integrated in Differential Protection

6 Local Breaker Backup (LBB) Protn. - 220 KV side - 66 KV side

-Integrated in Differential Protection and Bus Bar protection - Integrated in BCPU

7 Buchholz Relay Integrated in Transformer. Auxiliary relay in protection panel.

8 Pressure Relief Device Integrated in Transformer. Auxiliary relay in protection panel.

9 Oil & Wdg. Temp. Alarm & Tripping

Integrated in Transformer. Auxiliary relay in protection panel.

10 OLTC Oil Surge Relay Integrated in Transformer. Auxiliary relay in protection panel.

11 Oil Level Low Alarm Integrated in Transformer. Auxiliary relay in protection panel.

220/66 KV Transformer

12 Transformer Cooling Troubles Integrated in Transformer. Auxiliary relay in protection panel.


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


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



4 Over Fluxing Protection Integrated in Differential Protection

GETCO / E / 2S-113 / PP - 015 – 1A / R0 Dt.19.11.2011

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5 Local Breaker Backup (LBB) Protn. - 220 KV side - 132 KV side

-Integrated in Differential Protection and Bus Bar protection - Integrated in Dir. O/C & E/F protection



8 Oil & Wdg. Temp. Alarm & Tripping




11 Transformer Cooling Trouble Integrated in Transformer. Auxiliary relay in protection panel.


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



Integrated in BCPU



6 Oil & Wdg Temp. Alarm & Tripping





C) Bus Coupler Protection

1 Non Directional O/C & E/F Protection


220 KV Bus coupler


Integrated in Non Dir. O/C & E/F Protection and Bus Bar protection.

GETCO / E / 2S-113 / PP - 015 – 1A / R0 Dt.19.11.2011

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1 Non Directional O/C & E/F Protection


66 KV Bus coupler


Integrated in BCPU

E) Bus Bar Protection

220 KV Bus bar 1 Bus Differential Protection (Single scheme) 9 Bays, Extendable up to 24 Bays (i. e. Control Unit - 24 Bays)


F) Disturbance Recorder & Event Loggers

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

G) GPS based Time Synchronizing Equipment

220 KV Sub station is to be provided with IEC 61850 compatible Global Positioning System based Time Synchronizing Equipment to synchronize all the protections.

Documents

Control Relay Protection Philosophy