ABB REF611 - Page 132

LED 2
EARTH-FAULT PROTECTION
DOUBLE (CROSS-COUNTRY) EARTH-FAULT PROTECTION
DIRECTIONAL EARTH-FAULT PROTECTION
INTERMITTENT EARTH-FAULT PROTECTION
DEFLPDEF1
Io>->(1)
67N-1(1)
BLOCK
START
OPERATE
Io
ENA_MULT
Uo
RCA_CTL
DEFLPDEF2
Io>->(2)
67N-1(2)
BLOCK
START
OPERATE
Io
ENA_MULT
Uo
RCA_CTL
DEFHPDEF1
Io>>->(1)
67N-2(1)
BLOCK
START
OPERATEIo
ENA_MULT
Uo
RCA_CTL
OSWGAPC9
OR
OUT
IN_5
IN_6
IN_7
IN_8
IN_12
SELGAPC4
OUT_2
IN_11
INTRPTEF1
Io>->IEF(1)
67NIEF(1)
START
OPERATE
BLK_EF
BLOCK
Io
Uo
EFHPTOC1
Io>>(1)
51N-2(1)
BLOCK START
OPERATE
Io
ENA_MULT
Calculated lo
GUID-F1E996CA-9C33-4AFF-B7F2-6ABEF716A57B V1 EN
Figure 107: Earth-fault protection
Three stages are offered for directional earth-fault protection. In addition, there is a
dedicated protection stage INTRPTEF either for transient-based earth-fault
protection or for cable intermittent earth-fault protection in compensated networks.
Section 3 1MRS757456 D
REF611 standardized configurations
126 REF611
Application Manual