Section 4
1MAC050144-MB C
Protection functions
164
615 series ANSI
Technical Manual
4.1.5.9
Settings
Same as 51N as described in 4.1.4.9 above.
4.1.5.10
Monitored data
Same as 51N as described in 4.1.4.10 above.
4.1.5.11
Technical data
Same as 50N as described in 4.1.4.11 above.
4.1.6
Directional ground-fault protection 67/51N and 67/50N
4.1.6.1
Identification
4.1.6.2
Function block
Figure 71:
Function block
4.1.6.3
Functionality
The ground-fault function 67/51N and 67/50N is used as directional ground-fault
protection for feeders.
There are three different polarization signals - measured zero sequence voltage, calculated
zero sequence voltage and negative sequence voltage. The function picks up and trips
when the zero sequence current (I
0
) and zero sequence voltage (-V
0
) exceed the set limits
and the angle between them is inside the set operating sector. The function also picks up
and trips when the negative sequence current (I
2
) and negative sequence voltage (-V
2
)
exceed the set limits and the angle between them is inside the set operating sector. The trip
time characteristic for low stage (67/51N and 67/50N-1) and high stage (67/50N-2) can be
selected to be either definite time (DT) or inverse definite minimum time (IDMT).
In the DT mode, the function trips after a predefined trip time and resets when the fault
current disappears. The IDMT mode provides current-dependent timer characteristics.
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional ground-fault protection - Low
stage 1
DEFLPDEF1
I0>->(1)
67/51N
Directional ground-fault protection - Low
stage 2
DEFLPDEF2
I0>->(2)
67/50N-1
Directional ground-fault protection - High
stage
DEFHPDEF1
I0>>->(1)
67/50N-2
67/51N
PICKUP
TRIP
BLOCK
ENA_MULT
RCA_CTL
67/50N-2
PICKUP
TRIP
BLOCK
ENA_MULT
RCA_CTL
67/50N-1
PICKUP
TRIP
BLOCK
ENA_MULT
RCA_CTL
V0/VG/V2
V0/VG/V2
V0/VG/V2
I0/IG/I2
I0/IG/I2
I0/IG/I2
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
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Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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