ABB RELION 670 Series Technical Manual page 253

1MRK 502 066-UUS B
ANSI06000383 V3 EN-US
Figure 114: Definition of fault sectors for phase-to-phase fault
The phase-to-phase loop for the faulty phases will be determined if the angle between the
sequence voltages V
following conditions are fulfilled:
V1MinOP
|V |>
1
V2MinOp
|V |>
2
where:
V1MinOP and V2MinOp
The positive sequence voltage V
If there is a three-phase fault, there will not be any release of the individual phase signals, even if
the general conditions for V
Phase-to-ground and phase-to-phase-to-ground-fault detection
The detection of phase-to-ground and phase-to-phase-to-ground fault (US patent 5390067) is
based on two conditions:
1. Angle relationship between V
2. Angle relationship between V
The condition 1 determines faulty phase at single phase-to-ground fault by evaluating the angle
between V
Technical manual
and V lies within the sector defined according to figure
2 1
are the setting parameters for positive sequence and negative
sequence minimum operate voltages
A in figure
1
and V
2
and I
2
and V
2
and I .
2 0
ANSI06000383-3-en.vsd
114 above is reference.
are fulfilled.
1
0
1
Section 7
Impedance protection
114 and the
SEMOD153832-135 v5
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