© A

LSTO

M 2

013.

All

right

s re

serv

ed.

X 50/27 46BC

27/59

VTS50BF 79 25

Fault records Disturbance Record

Measurements

PSL

Local Communication

2nd Remote comm. port

Remote

LINE

BUS

comm. port

Distance Relay P44T

InterMiCOM

LEDs

Conventional signalling

Always available Optional

Protectioncommunication

V ref

V

I

Self monitoring

FL

49 SOTF/TOR21P 50/51

E00030

IEC61850

DEF

85

X 50/27 46BC

27/59

VTS50BF 79 25

Fault records Disturbance Record

Measurements

PSL

Local Communication

2nd Remote comm. port

Remote

LINE

BUS

comm. port

Distance Relay P44T

InterMiCOM

LEDs

Conventional signalling

Always available Optional

Protectioncommunication

V ref

V

I

Self monitoring

FL

49 SOTF/TOR21P 50/51

E00030

IEC61850

DEF

85

Zone 3 (reverse offset)

Zone 1

Zone P

Zone 2

Zone 3(without offset)

Zone P (reverse)

Directional (reverse)

Zone 4

Directional (forward)

50Hz, SIR = 5

50% 70% 80% 90%

10

20

30

40

0

Performance:Subcycle up

to 75% Reach Operate

Operate

RestrainRestrain

60Hz, SIR = 5

50% 70% 80% 90%

10

20

30

40

0

Performance:Subcycle up

to 75% Reach

Zone 3 (reverse offset)

Zone 1

Zone P

Zone 2

Zone 3(without offset)

Zone P (reverse)

Directional (reverse)

Zone 4

Directional (forward)

50Hz, SIR = 5

50% 70% 80% 90%

10

20

30

40

0

Performance:Subcycle up

to 75% Reach Operate

Operate

RestrainRestrain

60Hz, SIR = 5

50% 70% 80% 90%

10

20

30

40

0

Performance:Subcycle up

to 75% Reach

IEC Standard inverse t = TMS x

IEC Very inverse t = TMS x

IEC Extremely inverse t = TMS x

UK Long time inverse t = TMS x

IEEE Moderately inverse

t = TD x

IEEE Very inverse

IEEE Extremely inverse

US CO8 Inverse

US CO2 Short timeinverse

t = TD x

t = TD x

t = TD x

t = TD x

0.14

(IIs -1)0.02

13.5

(IIs -1)

80

(IIs -1)2

120

(IIs -1)

0.0515

(IIs -1)0.02 + 0.114

19.61

(IIs -1)2 + 0.491

28.2

(IIs -1)2 + 0.1217

5.95

(IIs -1)2 + 0.18

0.16758

(IIs -1)0.02 + 0.11858

IEEE/US curvesTD = 1

IEC/UK curvesTMS = 1

TD 0.01 to 100TMS 0.025 to 1.2

IEEE MIIEEE VI

IEEE EIUS CO8

US CO2

100101

Current (Multiples of Is)

0.1

1

10

100

Ope

ratin

gtim

e (s

)

UK LTI

IEC SI

IEC VI

IEC EI

1000

100

10

1

0.1100101

Current (Multiples of Is)

Ope

ratin

gtim

e (s

)

IEC Standard inverse t = TMS x

IEC Very inverse t = TMS x

IEC Extremely inverse t = TMS x

UK Long time inverse t = TMS x

IEEE Moderately inverse

t = TD x

IEEE Very inverse

IEEE Extremely inverse

US CO8 Inverse

US CO2 Short timeinverse

t = TD x

t = TD x

t = TD x

t = TD x

0.14

(IIs -1)0.02

13.5

(IIs -1)

80

(IIs -1)2

120

(IIs -1)

0.0515

(IIs -1)0.02 + 0.114

19.61

(IIs -1)2 + 0.491

28.2

(IIs -1)2 + 0.1217

5.95

(IIs -1)2 + 0.18

0.16758

(IIs -1)0.02 + 0.11858

IEEE/US curvesTD = 1

IEC/UK curvesTMS = 1

TD 0.01 to 100TMS 0.025 to 1.2

IEEE MIIEEE VI

IEEE EIUS CO8

US CO2

100101

Current (Multiples of Is)

0.1

1

10

100

Ope

ratin

gtim

e (s

)

UK LTI

IEC SI

IEC VI

IEC EI

1000

100

10

1

0.1100101

Current (Multiples of Is)

Ope

ratin

gtim

e (s

)

© A

LSTO

M 2

013.

All

right

s re

serv

ed.