Io>, Io>> And Io - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
7.1.2.
76
Protection Relay
Technical Reference Manual, Standard Configurations
Io>, Io>> and Io>>>
The non-directional earth-fault protection function blocks are designed for non-
directional earth-fault protection whenever the DT characteristic or, as concerns I
the IDMT (Inverse Definite Minimum Time) characteristic is appropriate.
Suppression of harmonics is possible.
Io>
CBFP
BS1
BS2 START
TRIP
GROUP
RESET CBFP
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Io>>
CBFP
BS1
BS2 START
TRIP
GROUP
RESET CBFP
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>,
0
Io>>>
CBFP
BS1
BS2 START
GROUP TRIP
CBFP
RESET