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6 F 2 S 0 8 5 7
Setting
The following shows the setting elements for the restricted earth fault protection and their setting
ranges.
Element Range Step Default Remarks
1REF 1ik
0.05 − 0.50(*)
0.01 0.50 Minimum operating current
1kct1
1.00 − 50.00
0.01 1.00
1kct2
1.00 − 50.00
0.01 1.00 CT ratio matching
1kct3
1.00 − 50.00
0.01 1.00
1p2
50 − 100%
1% 100% % slope of DF2
1kp
0.50 − 2.00(*)
0.01 1.00 DF2 restraining current section of
large current characteristic
2REF 2ik
0.05 − 0.50(*)
0.01 0.50 Minimum operating current
2kct1
1.00 − 50.00
0.01 1.00
2kct2
1.00 − 50.00
0.01 1.00 CT ratio matching
2kct3
1.00 − 50.00
0.01 1.00
2p2
50 − 100%
1% 100% % slope of DF2
2kp
0.50 − 2.00(*)
0.01 1.00 DF2 restraining current section of
large current characteristic
3REF 3ik
0.05 − 0.50(*)
0.01 0.50 Minimum operating current
3kct1
1.00 − 50.00
0.01 1.00
3kct2
1.00 − 50.00
0.01 1.00 CT ratio matching
3kct3
1.00 − 50.00
0.01 1.00
3p2
50 − 100%
1% 100% % slope of DF2
3kp
0.50 − 2.00(*)
0.01 1.00 DF2 restraining current section of
large current characteristic
T1REF
0.00 − 10.00s
0.01s 0.00s
T2REF
0.00 − 10.00s
0.01s 0.00s Delayed tripping
T3REF
0.00 − 10.00s
0.01s 0.00s
Scheme switch
[1REF1] to [1REF5]
[2REF1] to [2REF5]
[3REF1] to [3REF5]
[1REF] to [3REF]
[REF_DEF]
Off/On
Off/On
Off/On
1Io/2Io/3Io
Off/On
(**)
(**)
(**)
1Io
Off
Enable or disable to output
tripping signal
Number of line currents input to
1REF, 2REF and 3REF elements
(*): Multiplier of secondary rated current
(**): Default settings are dependent on the models. See Appendix H.
Setting of ik (1ik, 2ik and 3ik)
1ik, 2ik and 3ik are minimum operating current settings and are set as a ratio to the line CT
secondary rated current. ik is determined from the maximum erroneous zero sequence differential
current under normal operating conditions. A typical setting would be between 10% and 50%.