via a binary input, connect a free binary input with SMT to the ActSG input of the
SGCB-block.
Table 18: Binary input states and corresponding active setting groups
BI state Active setting group
OFF 1
ON 2
The active setting group defined by a parameter is overridden when a binary input is
enabled for changing the active setting group.
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.
A dedicated non-directional earth-fault protection block (EFHPTOC) is intended for
protection against double earth-fault situations in isolated or compensated networks.
This protection function uses the calculated residual current originating from the
phase currents.
The binary input 2 (X110:3-4) is intended for directional earth-fault protection
blocks’ Relay Characteristic Angle (RCA: 0°/-90°) or operation mode (I
0
Sinφ/
I
0
Cosφ) change. All operate signals are connected to the Master Trip and also to the
alarm LEDs. LED 2 is used for directional earth-fault and LED 3 for double earthfault
protection operate indication.
Section 3 1MRS756378 D
REF615 variants
84 REF615
Application Manual
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