400kv Protection presentation

400KV PROTECTION

400KV PROTECTION

400KV PROTECTION

400KV PROTECTION

PREPARED BY

PREPARED BY

GOPALA KRISHNA PALEPU

GOPALA KRISHNA PALEPU

ADE/APTRANSCO

ADE/APTRANSCO

[email protected], [email protected], Mobile:9440336984 Mobile:9440336984

BASICS

BASICS

OF

OF

OF

OF

ONE AND HALF

ONE AND HALF

CIRCUIT BREAKER

CIRCUIT BREAKER

CIRCUIT BREAKER

CIRCUIT BREAKER

SCHEME

SCHEME

PREPARED BY

GOPALA KRISHNA PALEPU

ADE/MRT(PROTECTION)

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1. IN THIS TWO BUSES ARE PRIOVIDED.

BUS-1

BUS-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

2. THESE TWO BUSES ARE INTER-CONNECTED BY THREE CIRCUIT BREAKERS.

BUS-1

BUS-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

3. THEY ARE DESIGNATED AS 1-52 CB, 2-52 CB, 3-52 CB.

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

BUS-2

3-52 CB

2-52 CB

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

4. LINE - 1 IS CONNECTED IN BETWEEN 1-52 CB & 2-52 CB. 5. LINE - 2 IS CONNECTED IN BETWEEN 3-52 CB & 2-52 CB.

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

6. LINE-1 HAVING TWO FEEDING PATHS i.e A. VIA BUS-1 & 1-52 CB

B. VIA BUS-2, 3-52 CB & 2-52 CB 7. LINE-2 HAVING TWO FEEDING PATHS i.e

A. VIA BUS-2 & 3-52 CB

B. VIA BUS-1, 1-52 CB & 2-52 CB

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

8. FOR INTURUPTING LINE-1 THE 1-52CB AND 2-52CB IS TO BE TRIPPED. 9. FOR INTURUPTING LINE-2 THE 3-52CB AND 2-52CB IS TO BE TRIPPED.

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

10. FOR ANY PROBLEM IN LINE-1 OR LINE-2 ALONG WITH MAIN BREAKER THE MIDDLE BREAKER OR SAY TIE BREAKER (2-52 CB) MUST TRIP.

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

13. SO THESE TWO FEEDERS CONTROLLED BY THREE CIRCUIT BREAKERS _{IT IS CALLED ONE & HALF BREAKER SYSTEM.}

11. NORMALLY IN ALL TYPES OF BUSBAR CONFIGUARATIONS ONE BREAKER IS SUFFICIENT FOR ONE FEEDER.

12. HERE TWO FEEDERS ARE CONTROLED BY THREE BREAKERS.

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

14. THE BAY BETWEEN BUS-1 & LINE-1 IS CALLED MAIN BAY FOR FEEDER-1.

M A IN B A Y (1 S TB A Y ) F O R F E E D E R -1

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

M A IN B A Y (1 B A Y ) F O R F E E D E R -1

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

M A IN B A Y (1 S T B A Y ) F O R F E E D E R

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

M A IN B A Y (1 S TB A Y ) F O R F E E D E R

-1 _{15. THE BAY BETWEEN LINE-1 & LINE-2 IS CALLED TIE BAY FOR FEEDER-1 & 2.}

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

M A IN B A Y (1 B A Y ) F O R F E E D E R -1 T IE B A Y ( 2 N D B A Y ) F O R F E E D E R -1 & 2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

M A IN B A Y (1 S T B A Y ) F O R F E E D E R T IE B A Y ( 2

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

M A IN B A Y (1 S TB A Y ) F O R F E E D E R

-1 _{16. THE BAY BETWEEN BUS-2 & LINE-2 IS CALLED MAIN BAY FOR FEEDER-2.}

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

M A IN B A Y (1 B A Y ) F O R F E E D E R -1 T IE B A Y ( 2 N D B A Y ) F O R F E E D E R -1 & 2 B A Y ) F O R F E E D E R -2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

M A IN B A Y (1 S T B A Y ) F O R F E E D E R T IE B A Y ( 2

TIE BAY (2ND_{BAY ) FOR FEEDER-1 & 2.}

M A IN B A Y (3 R D B A Y ) F O R F E E D E R -2 M A IN B A Y (3 R D

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

M A IN B A Y (1 S TB A Y ) F O R F E E D E R

-1 17. IN THIS SYSTEM FULL DIA MEANS 2 FEEDERS CONTROLLED BY 3 CBs.

18. HALF DIA MEANS 1 FEEDER CONTROLLED BY 2 CBs. (Nothing but Double CB System)

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

M A IN B A Y (1 B A Y ) F O R F E E D E R -1 T IE B A Y ( 2 N D B A Y ) F O R F E E D E R -1 & 2 B A Y ) F O R F E E D E R -2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

M A IN B A Y (1 S T B A Y ) F O R F E E D E R T IE B A Y ( 2

TIE BAY (2ND_{BAY ) FOR FEEDER-1 & 2.}

M A IN B A Y (3 R D B A Y ) F O R F E E D E R -2 M A IN B A Y (3 R D

ONE & HALF BREAKER DESCRIPTION

ONE & HALF BREAKER DESCRIPTION

BUS-1

BUS-1

BUS-2

1-52 CB

M A IN B A Y (1 S TB A Y ) F O R F E E D E R -1

GOPALA KRISHNA PALEPU ADE/MRT/ T&C/400KV SS/

O/O CE/400KV / L&SS/ VS APTRANSCO, HYDERABAD [email protected] Mobile: 9440336984

BUS-1

BUS-2

2-52 CB

1-52 CB

3-52 CB

LINE-1

M A IN B A Y (1 B A Y ) F O R F E E D E R -1 T IE B A Y ( 2 N D B A Y ) F O R F E E D E R -1 & 2 B A Y ) F O R F E E D E R -2

BUS-2

3-52 CB

2-52 CB

LINE-2

LINE-1

LINE-2

M A IN B A Y (1 S T B A Y ) F O R F E E D E R T IE B A Y ( 2

TIE BAY (2ND_{BAY ) FOR FEEDER-1 & 2.}

M A IN B A Y (3 R D B A Y ) F O R F E E D E R -2 M A IN B A Y (3 R D

SUBSTATION DESIGN/LAYOUT

SUBSTATION DESIGN/LAYOUT

(I

(I--CONFIGUARATION)

CONFIGUARATION)

FEEDER1

FEEDER3

FEEDER5

_FEEDER7

_FEEDER9

_FEEDER11

BUS

BUS--1

_{1 DIA1}

DIA2

DIA3

DIA4

DIA5

DIA6

B A Y 1 B A Y 2 B A Y 4 B A Y 5 B A Y 7 B A Y 8 B A Y 1 0 B A Y 1 1 B A Y 1 3 B A Y 1 4 B A Y 1 6 B A Y 1 7

FEEDER2

FEEDER4

FEEDER6

_FEEDER8

FEEDER10

_FEEDER12

BUS

BUS--2

2

B A Y 3 B A Y 6 B A Y 9 B A Y 1 2 B A Y 1 5 B A Y 1 8

SUBSTATION DESIGN/LAYOUT

SUBSTATION DESIGN/LAYOUT

(D

(D--CONFIGUARATION)

CONFIGUARATION)

FEEDER1

FEEDER2

FEEDER5

FEEDER6

FEEDER9

FEEDER10

BAY2 _{BAY8 BAY14}

BUS

BUS--2

2

BUS

BUS--1

1

B A Y 1 B A Y 3 B A Y 4 B A Y 6 B A Y 7 B A Y 9 B A Y 1 0 B A Y 1 2 B A Y 1 3 B A Y 1 5 B A Y 1 6 B A Y 1 8

DIA1

DIA3

DIA5

DIA6

FEEDER3

FEEDER4

FEEDER7

FEEDER8

FEEDER11

FEEDER12

B A Y 4 BAY5 B A Y 6 B A Y 1 0 BAY11 B A Y 1 2 B A Y 1 6 BAY17 B A Y 1 8

CT METHODS

CT METHODS

IN

IN

IN

IN

ONE AND HALF

ONE AND HALF

CIRCUIT BREAKER

CIRCUIT BREAKER

CIRCUIT BREAKER

CIRCUIT BREAKER

SCHEME

SCHEME

PREPARED BY

GOPALA KRISHNA PALEPU

ADE/MRT(PROTECTION)

DIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEM

DIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEM

3 CT METHOD

3 CT METHOD

4 CT METHOD

4 CT METHOD

LINE

LINE

CB

CB

CB

CB

CB

CB

AT/F

AT/F

CB

CB

CB

6 CT METHOD

6 CT METHOD

6 CT METHOD

6 CT METHOD

LINE

LINE

CB

CB

CB

CB

CB

CB

AT/F

AT/F

5 CT METHOD

5 CT METHOD

LINE

CB

CB

CB

AT/F

6 CT METHOD

6 CT METHOD

LINE

AT/F

6 CT METHOD

6 CT METHOD

LINE

CB

CB

CB

AT/F

LINE

8 CT METHOD

8 CT METHOD

AT/F

SINGLE BUS SYSTEM

SINGLE BUS SYSTEM

1 1--52CB52CB 1-89 1-89L 1-CT P2 P1

BUS

1-CVT BB-EVT / CVT B U S B A R M A IN 1 P R O T B U S B A R M A IN 1 P R O T B U S B A R M A IN 2 P R O T B U S B A R M A IN 2 P R O T B C U + E N E R G Y M E T E R B C U + E N E R G Y M E T E R 1 P R O T E C T IO N 1 P R O T E C T IO N F O R L IN E ( 2 1 L 1 /8 7 L 1 ) F O R L IN E ( 2 1 L 1 /8 7 L 1 ) P R O T E C T IO N P R O T E C T IO N F O R L IN E ( 2 1 L 2 /8 7 L 2 ) F O R L IN E ( 2 1 L 2 /8 7 L 2 ) 1 2 3 4 5 1 B U S B A R M A IN 1 P R O T B U S B A R M A IN 1 P R O T (8 7 B B M 1 + L B B ) (8 7 B B M 1 + L B B ) B U S B A R M A IN 2 P R O T B U S B A R M A IN 2 P R O T (8 7 B B M 2 + L B B ) (8 7 B B M 2 + L B B ) B C U + E N E R G Y M E T E R B C U + E N E R G Y M E T E R F O R L IN E F O R L IN E M A IN M A IN --1 P R O T E C T IO N 1 P R O T E C T IO N F O R L IN E ( 2 1 L 1 /8 7 L 1 ) F O R L IN E ( 2 1 L 1 /8 7 L 1 ) M A IN M A IN --22 P R O T E C T IO N P R O T E C T IO N F O R L IN E ( 2 1 L 2 /8 7 L 2 ) F O R L IN E ( 2 1 L 2 /8 7 L 2 ) 1 2 3 1 2 3 LATEST CONCEPT

REDUNDANT LINE PROTECTION, REDUNDANT ICT PROTECTION, REDUNDANT BUSBAR PROTECTION, LBB IS IN BUILT FUNCTION OF BUSBAR

400KV C.T. INFORMATION

400KV C.T. INFORMATION

P1

P2

P1 P2

PRIMARY CONNECTIONS : P1 – P2

CURRENT RATING : 2000 AMPS

CORES

CLASS

PURPOSE

SECONDARY CONNECTIONS

CURRENT RATING : 1A

HAIR

HAIR

CORES

CLASS

PURPOSE

CURRENT RATING : 1A

2000/ 1A

1000/ 1A

500/ 1A

CORE-1

PS

BUSBAR

PROTECTION

1S1 – 1S3

1S1 – 1S2

1S2 – 1S3

__

CORE-2

PS

BUSBAR

CHECKUP

PROTECTION

2S1 – 2S3

2S1 – 2S2

2S2 – 2S3

__

1

2

3

4

5

1

5

EYE BOLT

EYE BOLT

DESIGN

DESIGN

HAIR

HAIR

PIN /

PIN /

U SHAPE

U SHAPE

DESIGN

DESIGN

DEAD TANK DESIGN

DEAD TANK DESIGN

CORE-3

0.2

METERING

3S1 – 3S4

3S1 – 3S3

3S4 – 3S2

3S1 – 3S2

3S4 – 3S3

CORE-4

PS

MAIN-2

PROTECTION

4S1 – 4S4

4S1 – 4S3

4S4 – 4S2

4S1 – 4S2

4S4 – 4S3

CORE-5

PS

MAIN-1

PROTECTION

5S1 – 5S4

5S1 – 5S3

5S4 – 5S2

5S1 – 5S2

5S4 – 5S3

1

2

3

4

5

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

1-89 3-89 BUS-1 BUS-2

(3CT METHOD)

(3CT METHOD)

1-89A 1 1--52CB52CB 3-89A 3 3--52CB52CB 1-CT P1 P2 3-CT P1 P2 2-CT P1 P2

LINE 1

2 2--52CB52CB 2-89A 2-89B 1-89L 3-89T

T/F-1

CT CONNECTIONS IN 3CT METHOD

CT CONNECTIONS IN 3CT METHOD

CORE

CORE

1

1 –

– CT

CT

2

2 –

– CT

CT

3

3 –

– CT

CT

CORE

CORE –

– 1

1

( PS) ( PS)

MAIN1 BUSBAR

MAIN1 BUSBAR--1

1

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB1M1)

(87BB1M1)

MAIN1 DIFFFERENTIAL

MAIN1 DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER (87T1)

TRANSFORMER (87T1)

MAIN1 BUSBAR

MAIN1 BUSBAR--2

2

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB2M1)

(87BB2M1)

(87BB1M1)

(87BB1M1)

TRANSFORMER (87T1)

TRANSFORMER (87T1)

(87BB2M1)

(87BB2M1)

CORE

CORE –

– 2

2

( PS) ( PS)

MAIN2 BUSBAR

MAIN2 BUSBAR--1

1

PROTECTION LBB INBUILT

PROTECTION LBB INBUILT

(87BB1M2)

(87BB1M2)

BACKUP PROTECTION FOR

BACKUP PROTECTION FOR

TRANSFORMER (67 HV)

TRANSFORMER (67 HV)

MAIN2 BUSBAR

MAIN2 BUSBAR--2

2

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB2M2)

(87BB2M2)

CORE

CORE –

– 3

3

( 0.2) ( 0.2)

SPARE

SPARE

HV BCU + HV ENERGY

HV BCU + HV ENERGY

METER FOR AT/F HV

METER FOR AT/F HV

SPARE

SPARE

CORE

CORE –

– 4

4

BCU + ENERGY METER

BCU + ENERGY METER

BCU + ENERGY METER

BCU + ENERGY METER

HV BCU + HV ENERGY

HV BCU + HV ENERGY

CORE

CORE –

– 4

4

(0.2)

(0.2)

FOR FEEDER

FOR FEEDER

FOR FEEDER

FOR FEEDER

METER FOR AT/F HV

METER FOR AT/F HV

CORE

CORE –

– 5

5

( PS) ( PS)

MAIN

MAIN--2 LINE PROTECTION

2 LINE PROTECTION

FOR FEEDER (21 L2 / 87L2)

FOR FEEDER (21 L2 / 87L2)

MAIN

MAIN--2 LINE PROTECTION

2 LINE PROTECTION

FOR FEEDER (21 L2 / 87L2)

FOR FEEDER (21 L2 / 87L2)

BACKUP PROTECTION FOR

BACKUP PROTECTION FOR

TRANSFORMER (67 HV)

TRANSFORMER (67 HV)

CORE

CORE –

– 6

6

( PS) ( PS)

MAIN

MAIN--1 LINE PROTECTION

1 LINE PROTECTION

FOR FEEDER (21L1/87L1)

FOR FEEDER (21L1/87L1)

MAIN

MAIN--1 LINE PROTECTION

1 LINE PROTECTION

FOR FEEDER (21L1/87L1)

FOR FEEDER (21L1/87L1)

MAIN1 DIFFFERENTIAL

MAIN1 DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER (87T1)

TRANSFORMER (87T1)

CT CONNECTIONS IN 3CT METHOD

CT CONNECTIONS IN 3CT METHOD

CORE

CORE

1

1 –

– CT

CT

2

2 –

– CT

CT

3

3 –

– CT

CT

CORE

CORE –

– 1

1

( PS) ( PS)

MAIN1 BUSBAR

MAIN1 BUSBAR--1

1

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB1M1)

(87BB1M1)

MAIN1 DIFFFERENTIAL

MAIN1 DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER (87T1)

TRANSFORMER (87T1)

MAIN1 BUSBAR

MAIN1 BUSBAR--2

2

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB2M1)

(87BB2M1)

(87BB1M1)

(87BB1M1)

TRANSFORMER (87T1)

TRANSFORMER (87T1)

(87BB2M1)

(87BB2M1)

CORE

CORE –

– 2

2

( PS) ( PS)

MAIN2 BUSBAR

MAIN2 BUSBAR--1

1

PROTECTION LBB INBUILT

PROTECTION LBB INBUILT

(87BB1M2)

(87BB1M2)

BACKUP PROTECTION FOR

BACKUP PROTECTION FOR

TRANSFORMER (67 HV)

TRANSFORMER (67 HV)

MAIN2 BUSBAR

MAIN2 BUSBAR--2

2

PROTECTION LBB IN BUILT

PROTECTION LBB IN BUILT

(87BB2M2)

(87BB2M2)

CORE

CORE –

– 3

3

(0.2) (0.2)

BCU + ENERGY METER

BCU + ENERGY METER

FOR FEEDER

FOR FEEDER

BCU + ENERGY METER

BCU + ENERGY METER

FOR FEEDER

FOR FEEDER

SPARE

SPARE

CORE

CORE –

– 4

4

MAIN

MAIN--2 LINE PROTECTION

2 LINE PROTECTION

MAIN

MAIN--2 LINE PROTECTION

2 LINE PROTECTION

BACKUP PROTECTION FOR

BACKUP PROTECTION FOR

CORE

CORE –

– 4

4

( PS)

( PS)

FOR FEEDER (21 L2 / 87L2)

FOR FEEDER (21 L2 / 87L2)

FOR FEEDER (21 L2 / 87L2)

FOR FEEDER (21 L2 / 87L2)

TRANSFORMER (67 HV)

TRANSFORMER (67 HV)

CORE

CORE –

– 5

5

( PS) ( PS)

MAIN

MAIN--1 LINE PROTECTION

1 LINE PROTECTION

FOR FEEDER (21L1/87L1)

FOR FEEDER (21L1/87L1)

MAIN

MAIN--1 LINE PROTECTION

1 LINE PROTECTION

FOR FEEDER (21L1/87L1)

FOR FEEDER (21L1/87L1)

MAIN1 DIFFFERENTIAL

MAIN1 DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER (87T1)

TRANSFORMER (87T1)

BUSHING CT

BUSHING CT

METERING CORE

METERING CORE

(0.2) (0.2)

NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO

TRANSFORMER OR BUS REACTOR IS PROVIDED IN A DIA OF ONE AND HALF BREAKER TRANSFORMER OR BUS REACTOR IS PROVIDED IN A DIA OF ONE AND HALF BREAKER SYSTEM, IF BUSHING CT METERING CORE IS AVAILABLE, THEN IT IS USED FOR HV BCU SYSTEM, IF BUSHING CT METERING CORE IS AVAILABLE, THEN IT IS USED FOR HV BCU + HV ENERGY METER FOR AT/F HV OR BUS REACTOR

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

BUS-1 BUS-2

(3CT METHOD)

(3CT METHOD)

79+25 (BCU) 79+25 (BCU) VBB1 VL1/VL2 OR VBB2 VBB2 VL2/VL1 OR VBB1 87BB1M1 BU 87BB1M2 BU BCU+EM (L) MAIN1:21L1 / 87L1 MAIN2: 21L2/87L2 87BB2M1 BU 87BB2M2 BU SPARE MAIN1:87T1 B/U: 67HV B C U + E M ( H V ) M A IN 1 :8 7 T 1 B /U : 6 7 L V 79+25 (BCU) OR VBB2 OR VBB1 VBB1/VL1 VBB2/VL2

LINE 1

ICT

B C U + E M (L ) M A IN 1 :2 1 L 1 / 8 7 L 1 M A IN 2 : 2 1 L 2 /8 7 L 2 M A IN 1 :8 7 T 1 B /U : 6 7 H V B C U + E M ( H V ) M A IN 2 :8 7 T 2 M A IN 1 :8 7 T 1 B /U : 6 7 L V VBB2/VL2 L B B

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(3CT METHOD)

(3CT METHOD) –

– LINE PROTECTION

LINE PROTECTION

B U S -1 BCU+EM BCU+EM MAIN2: 21L2 MAIN2: 21L2 FIBER MAIN1: 87BB1 MAIN1: 87BB1 MAIN2 :87BB1 MAIN2 :87BB1 MAIN1: 21L1 MAIN1: 21L1

LINE

FIBER OPTIC OPTIC C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR

ABB Network Partner AG

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ABB Network Partner AG REL 316*4

C E

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(3CT METHOD)

(3CT METHOD) –

– ICT PROTECTION

ICT PROTECTION

B U S -2 TIE LBB TIE LBB MAIN1: 87BB2 MAIN1: 87BB2 MAIN2 :87BB2 MAIN2 :87BB2 BCU+EM BCU+EM MAIN2: 87T2 MAIN2: 87T2 B/U: 67HV B/U: 67HV 50Z +87BB

ABB Network Partner AG

1 2

9 10

ABB Network Partner AG REL 316*4

ICT

MAIN1: 87T1 MAIN1: 87T1 C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR 3 4 5 6 7 8 11 12 13 14 15 16 C E B/U: 67LV B/U: 67LV

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

87BB1 CVT VBB1 79 25 BF VL1 / VL2 ORVBB2 VBB1 87L 21M2 VL1 CVT VL1 BUSBAR BUSBAR--11 21M1 VL1 79 25 FEEDER1 / LINE1 FEEDER2 / LINE2 BF VL1 / VBB1 VL2 / VBB2 87BB2 CVT VBB2 79 25 VBB2 BF VL2 / VL1 ORVBB1 FEEDER2 / LINE2 CVT VL2 BUSBAR BUSBAR--22 MAIN-1

MAIN-2 PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE)

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

B U S -I B U S -I I M A IN -1 M A IN -2 M E T + S Y N M A IN -1 M A IN -2 M E T + S Y N 87 B B M 1 B U S B A R P R O T N M A IN -1 87 B B M 1 B U S B A R P R O T N M A IN -1 87 B B M 2 B U S B A R P R O T N M A IN -2 87 B B M 2 B U S B A R P R O T N M A IN -2 21 L1 -LI N E D IS T P R O T 1 21 L2 -LI N E D IS T P R O T 2 87 T 1-IC T D IF F P R O T 1 67 H V -IC T D IR O /C ,E /F

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

B U S B U S 1-52 CB 2-52 CB 3-52 CB MAIN-1 MAIN-2 MET+SYN M E T + S Y N M E T + S Y N DISTURBANCE RECORDER, EVENT RECORDER, FAULT LOCATOR

ARE IN BUILT FUNCTIONS IN BOTH

DISTURBANCE RECORDER, EVENT RECORDER,

ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIFF PROT RELAYS

87T2- ICT DIFF PROT2 ARE IN BUILT FUNCTIONS IN BOTH

NUMERICAL DIST PROT RELAYS 21L1 & 21L2

NUMERICAL DIFF PROT RELAYS 87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.

ACCORDING TO CONDITION IT IS SELECTED BUS-1 CVT OR BUS-2 CVT OR LINE CVT HV & LV OVER FLUX PROT ARE IN BUILT.

ICT HV METERING IS BUSHING CT LATEST CONCEPT

REDUNDANT LINE PROTECTION REDUNDANT ICT PROTECTION

REDUNDANT DISTRIBUTED BUSBAR PROTECTION LBB IS IN BUILT FUNCTION OF BUSBAR

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

1-89 3-89 BUS-1 BUS-2

(4CT METHOD)

(4CT METHOD)

1-89A 1 1--52CB52CB 3-89A 3 3--52CB52CB 1-CT P1 P2 3-CT P1 P2 2-ACT P1 P2 2-BCT P1 _P2

LINE 1

2 2--52CB52CB 2-89A 2-89B 1-89L 3-89T

T/F-1

CORE

CORE

1

1-- CT

CT

2

2--BCT

BCT

2

2--ACT

ACT

3

3--CT

CT

CORE

CORE--1

1

(PS) (PS)

MAIN1 BUSBAR

MAIN1 BUSBAR--1

1

PROTECTION

PROTECTION

LBB IN BUILT

LBB IN BUILT

(87BB1M1)

(87BB1M1)

SPARE

SPARE

SPARE

SPARE

MAIN1 BUSBAR

MAIN1 BUSBAR--2

2

PROTECTION

PROTECTION

LBB IN BUILT

LBB IN BUILT

(87BB2M1)

(87BB2M1)

CT CONNECTIONS IN 4CT METHOD

CT CONNECTIONS IN 4CT METHOD

(87BB1M1)

(87BB1M1)

(87BB2M1)

(87BB2M1)

CORE

CORE--2

2

(PS) (PS)

MAIN2 BUSBAR

MAIN2 BUSBAR--1

1

PROTECTION

PROTECTION

LBB INBUILT

LBB INBUILT

(87BB1M2)

(87BB1M2)

TIE LBB

TIE LBB

SPARE

SPARE

MAIN2 BUSBAR

MAIN2 BUSBAR--2

2

PROTECTION

PROTECTION

LBB INBUILT

LBB INBUILT

(87BB2M2)

(87BB2M2)

CORE

CORE--3

3

(0.2) (0.2)

BCU + ENERGY

BCU + ENERGY

METER

METER

FOR FEEDER

FOR FEEDER

BCU + ENERGY

BCU + ENERGY

METER

METER

FOR FEEDER

FOR FEEDER

HV BCU + HV

HV BCU + HV

ENERGY METER

ENERGY METER

FOR ICT HV

FOR ICT HV

HV BCU + HV

HV BCU + HV

ENERGY METER

ENERGY METER

FOR ICT HV

FOR ICT HV

MAIN

MAIN--2 LINE

2 LINE

MAIN

MAIN--2 LINE

2 LINE

BACKUP

BACKUP

BACKUP

BACKUP

CORE

CORE--4

4

(PS) (PS)

MAIN

MAIN--2 LINE

2 LINE

PROTECTION FOR

PROTECTION FOR

FEEDER

FEEDER

(21 L2 / 87L2)

(21 L2 / 87L2)

MAIN

MAIN--2 LINE

2 LINE

PROTECTION FOR

PROTECTION FOR

FEEDER

FEEDER

(21 L2 / 87L2)

(21 L2 / 87L2)

BACKUP

BACKUP

PROTECTION FOR

PROTECTION FOR

TRANSFORMER

TRANSFORMER

(67 HV)

(67 HV)

BACKUP

BACKUP

PROTECTION FOR

PROTECTION FOR

TRANSFORMER

TRANSFORMER

(67 HV)

(67 HV)

CORE

CORE--5

5

(PS) (PS)

MAIN

MAIN--1 LINE

1 LINE

PROTECTION

PROTECTION FOR

FOR

FEEDER

FEEDER

(21L1/87L1)

(21L1/87L1)

MAIN

MAIN--1 LINE

1 LINE

PROTECTION

PROTECTION FOR

FOR

FEEDER

FEEDER

(21L1/87L1)

(21L1/87L1)

MAIN1

MAIN1--ICT

ICT

DIFFFERENTIAL

DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER

TRANSFORMER

(87T1)

(87T1)

MAIN1

MAIN1 ––ICT

ICT

DIFFFERENTIAL

DIFFFERENTIAL

PROTECTION FOR

PROTECTION FOR

TRANSFORMER

TRANSFORMER

(87T1)

(87T1)

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

BUS-1 BUS-2

(4 CT METHOD)

(4 CT METHOD)

79+25 (BCU) 79+25 (BCU) VBB1 VL1/VL2 OR VBB2 VBB2 VL2/VL1 OR VBB1 87BB1M1 BU 87BB1M2 BU BCU+EM (L) MAIN1:21L1 / 87L1 MAIN2: 21L2/87L2 87BB2M1 BU 87BB2M2 BU MAIN1:87T1 B/U: 67HV BCU+EM (HV) M A IN 1 :8 7 T 1 B /U : 6 7 L V 79+25 (BCU) OR VBB2 OR VBB1 VBB1/VL1 VBB2/VL2

LINE 1

ICT

B C U + E M (H V ) M A IN 1 :2 1 L 1 / 8 7 L 1 M A IN 2 : 2 1 L 2 /8 7 L 2 M A IN 1 :8 7 T 1 B /U : 6 7 H V M A IN 2 :8 7 T 2 M A IN 1 :8 7 T 1 B /U : 6 7 L V T IE L B B B C U + E M (L )

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(4CT METHOD)

(4CT METHOD) –

– LINE PROTECTION

LINE PROTECTION

B U S -1 BCU+EM(L) BCU+EM(L) MAIN2: 21L2 MAIN2: 21L2 FIBER MAIN1: 87BB1 MAIN1: 87BB1 MAIN2 :87BB1 MAIN2 :87BB1 MAIN1: 21L1 MAIN1: 21L1

TIE LBB

LINE

FIBER OPTIC OPTIC C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR

ABB Network Partner AG

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ABB Network Partner AG REL 316*4

C E

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(4CT METHOD)

(4CT METHOD) –

– ICT PROTECTION

ICT PROTECTION

B U S -2 MAIN1: 87BB2 MAIN1: 87BB2 MAIN2 :87BB2 MAIN2 :87BB2 BCU+EM (HV) BCU+EM (HV) MAIN2: 87T2 MAIN2: 87T2 B/U: 67HV B/U: 67HV 50Z +87BB

ABB Network Partner AG

1 2

9 10

ABB Network Partner AG REL 316*4

ICT

MAIN1: 87T1 MAIN1: 87T1 C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR 3 4 5 6 7 8 11 12 13 14 15 16 C E B/U: 67LV B/U: 67LV

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME

87BB1 CVT VBB1 79 25 BF VL1 / VL2 ORVBB2 VBB1 87L 21M2 VL1 CVT VL1 BUSBAR BUSBAR--11 21M1 VL1 FEEDER1 / LINE1 FEEDER2 / LINE2 BF 79 25 VL1 / VBB1 VL2 / VBB2 87BB2 CVT VBB2 79 25 VBB2 BF VL2 / VL1 ORVBB1 FEEDER2 / LINE2 CVT VL2 BUSBAR BUSBAR--22 MAIN-1

MAIN-2 PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE)

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

B U S -I B U S -I I M A IN -1 M A IN -2 M E T + S Y N M A IN -1 M A IN -2 M E T + S Y N 87 B B M 1 B U S B A R P R O T N M A IN -1 87 B B M 1 B U S B A R P R O T N M A IN -1 87 B B M 2 B U S B A R P R O T N M A IN -2 87 B B M 2 B U S B A R P R O T N M A IN -2 21 L1 -LI N E D IS T P R O T 1 21 L2 -LI N E D IS T P R O T 2 87 T 1-IC T D IF F P R O T 1 67 H V -IC T D IR O /C ,E /F

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME

B U S B U S 1-52 CB 2-52 CB 3-52 CB MAIN-1 MAIN-2 MET+SYN M E T + S Y N M E T + S Y N DISTURBANCE RECORDER, EVENT RECORDER, FAULT LOCATOR

ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIST PROT RELAYS

DISTURBANCE RECORDER, EVENT RECORDER,

ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIFF PROT RELAYS

87T2- ICT DIFF PROT2 NUMERICAL DIST PROT RELAYS

21L1 & 21L2

NUMERICAL DIFF PROT RELAYS 87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.

ACCORDING TO CONDITION IT IS SELECTED BUS-1 CVT OR BUS-2 CVT OR LINE CVT HV & LV OVER FLUX PROT ARE IN BUILT LATEST CONCEPT

REDUNDANT LINE PROTECTION REDUNDANT ICT PROTECTION

REDUNDANT DISTRIBUTED BUSBAR PROTECTION LBB IS IN BUILT FUNCTION OF BUSBAR

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

3-89 BUS-1 BUS-2 1-89 P1 P1 1A-CT 3A-CT

(6CT METHOD)

(6CT METHOD)

1-89A

1

1--52CB

52CB

1B-CT 3-89A

3

3--52CB

52CB

3B-CT 2B-CT P2 P1 P2 P1 P2 P1 P1 P2 P2 P1 P2 1A-CT 2A-CT 3A-CT

LINE 1

2

2--52CB

52CB

2-89A 2-89B 1-89L 3-89T

T/F-1

CURRENT TRANSFORMER

CURRENT TRANSFORMER

CONNECTIONS IN 6CT METHOD

CONNECTIONS IN 6CT METHOD

(GIS or AIS with DEAD TANK CBs)

(GIS or AIS with DEAD TANK CBs)

1B

1B--CT

CT

1A

1A--CT

CT

2B

2B--CT

CT

2A

2A--CT

CT

3A

3A--CT

CT

3B

3B--CT

CT

CORE

CORE--1

1

MAIN1 MAIN1 2CT’s SECONDARIES 2CT’s SECONDARIES 2CT’s SECONDARIES 2CT’s SECONDARIES MAIN1 MAIN1

CORE

CORE--1

1

(PS)

(PS)

MAIN1 MAIN1 BUSBAR BUSBAR--1 1 PROTN PROTN LBB IN BUILT LBB IN BUILT (87BB1M1) (87BB1M1) 2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED ARE CONNECTED IN PARALLEL AND IN PARALLEL AND CONNECTED TO CONNECTED TO MAIN

MAIN--1 PROTECTION1 PROTECTION

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED ARE CONNECTED CONNECTED TO CONNECTED TO MAIN

MAIN--1 PROTECTION1 PROTECTION

MAIN1 MAIN1 BUSBAR BUSBAR--22 PROTN LBB IN PROTN LBB IN BUILT BUILT (87BB2M1) (87BB2M1)

CORE

CORE--2

2

(PS)

(PS)

MAIN2

MAIN2

BUSBAR

BUSBAR--1

1

PROTN

PROTN

LBB INBUILT

LBB INBUILT

(87BB1M2)

(87BB1M2)

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED IN ARE CONNECTED IN PARALLEL AND PARALLEL AND CONNECTED TO CONNECTED TO MAIN

MAIN--2 PROTECTION 2 PROTECTION

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED IN ARE CONNECTED IN PARALLEL AND PARALLEL AND CONNECTED TO CONNECTED TO BACKUP PROTECTION BACKUP PROTECTION

MAIN2

MAIN2

BUSBAR

BUSBAR--2

2

PROTN LBB

PROTN LBB

INBUILT

INBUILT

(87BB2M2)

(87BB2M2)

CORE

CORE--3

3

(0.2)

(0.2)

SPARE

SPARE

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED IN ARE CONNECTED IN PARALLEL AND PARALLEL AND CONNECTED TO CONNECTED TO

BCU + ENERGY

BCU + ENERGY

METER FOR

METER FOR

FEEDER

FEEDER

2CT’s SECONDARIES 2CT’s SECONDARIES ARE CONNECTED IN ARE CONNECTED IN PARALLEL AND PARALLEL AND CONNECTED TO CONNECTED TO

HV BCU + HV

HV BCU + HV

ENERGY METER FOR

ENERGY METER FOR

ICT HV

ICT HV

SPARE

SPARE

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

BUS-1 BUS-2

(6CT METHOD)

(6CT METHOD)

MAIN1:21L1 / 87L1 MAIN2: 21L2/87L2 MAIN1:87T1 B/U: 67HV 87BB1M1 BU 87BB1M2 BU BCU+EM (L) MAIN2: 21L2/87L2 87BB2M1 BU 87BB2M2 BU B/U: 67HV BCU+EM (HV) M A IN 1 :8 7 T 1 B /U : 6 7 L V 79+25 (BCU) 79+25 (BCU) 79+25 (BCU) VBB1 VL1/VL2 OR VBB2 VBB2 VL2/VL1 OR VBB1 V B B 1 /V L 1 V B B 2 /V L 2

LINE 1

ICT

B C U + E M (H V ) M A IN 1 :2 1 L 1 / 8 7 L 1 M A IN 2 : 2 1 L 2 /8 7 L 2 M A IN 1 :8 7 T 1 B /U : 6 7 H V M A IN 2 :8 7 T 2 M A IN 1 :8 7 T 1 B /U : 6 7 L V T IE L B B B C U + E M (L )

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(6CT METHOD)

(6CT METHOD) –

– LINE PROTECTION

LINE PROTECTION

B U S -1 BCU+EM(L) BCU+EM(L) MAIN2: 21L2 MAIN2: 21L2 FIBER MAIN1: 87BB1 MAIN1: 87BB1 MAIN2 :87BB1 MAIN2 :87BB1 MAIN1: 21L1 MAIN1: 21L1

TIE LBB

LINE

FIBER OPTIC OPTIC C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR

ABB Network Partner AG

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ABB Network Partner AG REL 316*4

C E

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(6CT METHOD)

(6CT METHOD) –

– ICT PROTECTION

ICT PROTECTION

B U S -2 MAIN1: 87BB2 MAIN1: 87BB2 MAIN2 :87BB2 MAIN2 :87BB2 BCU+EM (HV) BCU+EM (HV) MAIN2: 87T2 MAIN2: 87T2 B/U: 67HV B/U: 67HV 50Z +87BB

ABB Network Partner AG

1 2

9 10

ABB Network Partner AG REL 316*4

ICT

MAIN1: 87T1 MAIN1: 87T1 C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR 3 4 5 6 7 8 11 12 13 14 15 16 C E B/U: 67LV B/U: 67LV

ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME

87BB1 CVT VBB1 BF 79 25 VL1 / VL2 VBB1 87L 21M2 VL1 CVT VL1 BUSBAR BUSBAR--11 21M1 VL1 VL1 / VL2 ORVBB2 _{FEEDER1 / LINE1} FEEDER2 / LINE2 BF 79 25 VL1 / VBB1 VL2 / VBB2 87BB2 CVT VBB2 79 25 VBB2 VL2 / VL1 ORVBB1 FEEDER2 / LINE2 CVT VL2 BUSBAR BUSBAR--22 MAIN-1 MAIN-2 PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE)

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED . BF

TYPICAL ONE & HALF BREAKER

TYPICAL ONE & HALF BREAKER

SYSTEM ADOPTED IN GIS

SYSTEM ADOPTED IN GIS

TYPICAL ONE & HALF BREAKER

TYPICAL ONE & HALF BREAKER

SYSTEM ADOPTED IN GIS

SYSTEM ADOPTED IN GIS

1-1/2 CB SYSTEM

(SIEMENS VATECH)

VD VD VD VD

DS : DISCONNECTOR SWITCH, GS: GROUNDING SWITCH, CT: CURRENT TRANSFORMER, VD: VOLTAGE DIVIDER

CT CT CT CT CT CT VD VD DS DS DS DS DS DS G S G S G S G S G S G S G S G S CB CB _CB

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

3-89 BUS-1 BUS-2 1-89

(5CT METHOD)

(5CT METHOD)

1-89A 1 1--52CB52CB 1-CT 3-89A 3 3--52CB52CB 3-CT 2-CT P2 P1 P2 P1 P1 P2

LINE 1

2 2--52CB52CB 1L-CT 2-89A 2-89B 1-89L 3-89T

T/F-1

3T-CT P2 P1 P2 P1

CORE

CORE

1

1--CT

CT

1

1--LCT

LCT

2

2--CT

CT

3

3--TCT

TCT

3

3--CT

CT

CORE

CORE--1

1

(PS)

(PS)

MAIN1 BUSBAR MAIN1 BUSBAR--1 1 PROTECTION PROTECTION LBB IN BUILT LBB IN BUILT (87BB1M1) (87BB1M1) TEED PROT TEED PROT--11 (BAY 1&2) (BAY 1&2) TEED PROT TEED PROT--11 (BAY 2&3) (BAY 2&3) TEED PROT TEED PROT--11 (BAY 2&3) (BAY 2&3) MAIN1 BUSBAR MAIN1 BUSBAR--2 2 PROTECTION PROTECTION LBB IN BUILT LBB IN BUILT (87BB2M1) (87BB2M1)

CT CONNECTIONS IN 5CT METHOD

CT CONNECTIONS IN 5CT METHOD

CORE

CORE--2

2

(PS)

(PS)

MAIN2 BUSBAR MAIN2 BUSBAR--1 1 PROTECTION PROTECTION LBB INBUILT LBB INBUILT (87BB1M2) (87BB1M2) TEED PROT TEED PROT--22 (BAY 1&2) (BAY 1&2) TEED PROT TEED PROT--22 (BAY 2&3) (BAY 2&3) TEED PROT TEED PROT--22 (BAY 2&3) (BAY 2&3) MAIN2 BUSBAR MAIN2 BUSBAR--2 2 PROTECTION PROTECTION LBB INBUILT LBB INBUILT (87BB2M2) (87BB2M2)

CORE

CORE--3

3

(0.2)

(0.2)

BCU (L)BCU (L) ENERGY ENERGY METER (L)

METER (L) BCU (L)BCU (L)

ENERGY ENERGY METER (HV) METER (HV) SPARE SPARE BCU (HV) BCU (HV) Bushing CT Bushing CT

CORE

CORE--4

4

TEED PROTTEED PROT--22 MAINMAIN--22 PROTECTION PROTECTION TEED PROT TEED PROT--22 (BAY 1&2) + (BAY 1&2) + BACKUP BACKUP--ICTICT PROTECTION

PROTECTION TEED PROTTEED PROT--22

CORE

CORE--4

4

(PS)

(PS)

TEED PROT TEED PROT--22 (BAY 1&2)

(BAY 1&2) PROTECTIONPROTECTION

(21 L2 / 87L2) (21 L2 / 87L2) (BAY 1&2) + (BAY 1&2) + TIE LBB TIE LBB PROTECTION PROTECTION (67 HV) (67 HV) TEED PROT TEED PROT--22 (BAY 2&3) (BAY 2&3)

CORE

CORE--5

5

(PS)

(PS)

TEED PROT TEED PROT--11 (BAY 1&2) (BAY 1&2) MAIN MAIN--11 PROTECTION PROTECTION (21L1/87L1) (21L1/87L1) TEED PROT TEED PROT--11 (BAY 1&2) (BAY 1&2) MAIN1 MAIN1--ICT ICT DIFFFERENTIAL DIFFFERENTIAL PROTECTION PROTECTION (87T1) (87T1) TEED PROT TEED PROT--11 (BAY 2&3) (BAY 2&3)

Paralleling of 2Nos CTs to the Main-1/Main-2/Backup line protection is not required. This gives better transient response. Separate STUB protection can be connected (Nothing BUT TEED Protection).

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(5CT METHOD)

(5CT METHOD)

8 7 B B 1 M 1 B U 8 7 B B 1 M 2 B U 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 T E E D 8 7 B B 2 M 1 B U 8 7 B B 2 M 2 B U B U S -1 B U S -2 LBB 8 7 B B 1 M 1 8 7 B B 1 M 2 B C U (L ) 8 7 T E E D -1 ( 1 & 2 ) 8 7 T E E D -2 ( 1 & 2 ) 8 7 T E E D -1 ( 2 & 3 ) 8 7 T E E D -2 ( 2 & 3 ) 8 7 T E E D -1 ( 1 & 2 ) 8 7 T E E D -2 ( 1 & 2 ) 8 7 T E E D -1 ( 2 & 3 ) 8 7 T E E D -2 ( 2 & 3 ) B C U (L ) S P A R E 8 7 B B 2 M 1 8 7 B B 2 M 2 87 TEED-2 (1&2) EM (L) 87 TEED-2 (3&2) EM (HV) MAIN1:87T1 B/U: 67HV M A IN 1 :8 7 T 1 B /U : 6 7 L V MAIN1:21L1 / 87L1 MAIN2: 21L2/87L2

ICT

M A IN 2 :8 7 T 2 87 TEED-1 (1&2) 87 TEED-2 (1&2) 87 TEED-1 (3&2) 87 TEED-2 (3&2) M A IN 1 :8 7 T 1 B /U : 6 7 L V B C U ( H V )

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(5CT METHOD)

(5CT METHOD) –

– LINE PROTECTION

LINE PROTECTION

B U S -1 BCU BCU

ABB Network Partner AG REL 316*4

87 TEED1 (BAY 1&2) 87 TEED1 (BAY 1&2)

TIE LBB

MAIN1: 87BB1 MAIN1: 87BB1 MAIN2 :87BB1

MAIN2 :87BB1 MAIN1: 21L1MAIN1: 21L1

MAIN2: 21L2 MAIN2: 21L2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 C E

87 TEED2 (BAY 1&2) 87 TEED2 (BAY 1&2)

LINE

C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR

ABB Network Partner AG

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ABB Network Partner AG REL 316*4

C E

EM

EM

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(5CT METHOD)

(5CT METHOD) –

– ICT PROTECTION

ICT PROTECTION

B

U

S

-2

87 TEED1 (BAY 2&3) 87 TEED1 (BAY 2&3)

87 TEED2 (BAY 2&3) 87 TEED2 (BAY 2&3)

MAIN1: 87BB2 MAIN1: 87BB2 MAIN2 :87BB2 MAIN2 :87BB2 EM EM B/U: 67HV B/U: 67HV 50Z +87BB

ABB Network Partner AG

1 2

9 10

ABB Network Partner AG REL 316*4

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ABB Network Partner AG REL 316*4

C E

ICT

MAIN1: 87T1 MAIN1: 87T1 C E 50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR 3 4 5 6 7 8 11 12 13 14 15 16 C E B/U: 67LV B/U: 67LV

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

(5CT METHOD)

(5CT METHOD) –

– ICT

ICT –

– BUSHING CT PROTECTION

BUSHING CT PROTECTION

MAIN2: 87T2 MAIN2: 87T2 BCU((HV) BCU((HV) MAIN2: 87T2 MAIN2: 87T2 MAIN2: 87T2 MAIN2: 87T2 3

3--PH HIGH IMPEDANCEPH HIGH IMPEDANCE

3

ONE & HALF BREAKER ( 5 CT METHOD) WITH PROTECTION SCHEME

ONE & HALF BREAKER ( 5 CT METHOD) WITH PROTECTION SCHEME

87BB1 CVT VBB1 79 25 BF VL1 / VL2 ORVBB2 VBB1 CVT VL1 87L 21M2 VL1 BUSBAR BUSBAR--11 21M1 VL1 87 TD1 HZ 87 TD2 LZ

.

79 25 FEEDER1 / LINE1 FEEDER2 / LINE2 BF VL1 / VBB1 VL2 / VBB2 87BB2 CVT VBB2 79 25 VBB2 BF VL2 / VL1 ORVBB1 FEEDER2 / LINE2 CVT VL2 BUSBAR BUSBAR--22 MAIN-1 MAIN-2 PROTECTION OF LINE2

(OR TRANSFORMER, IF APPLICABLE) 87 TD1 HZ

87 TD2 LZ

.

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

ONE & HALF BREAKER SYSTEM

ONE & HALF BREAKER SYSTEM

3-89 BUS-1 BUS-2 1-89

(6CT METHOD)

(6CT METHOD)

1-89A

1

1--52CB

52CB

1-CT 3-89A

3

3--52CB

52CB

3-CT 2B-CT P2 P1 P2 P1 P1 P2 P2 P1 2A-CT

LINE 1

2

2--52CB

52CB

2-89A 2-89B 1-89L 3-89T

T/F-1

P2 P1 P2 P1 1L-CT 3T-CT