ABB Relion 650 Series Technical Manual page 131

1MRK 506 326-UUS B
200°
IEC06000385 V1 EN-US
Figure 69: Directional element used to release the measured angle between V
The input radians are summarized with an offset angle and the result evaluated. If the angle is
within the boundaries for a specific sector, the phase indication for that sector will be active see
figure 68. Only one sector signal is allowed to be activated at the same time.
The sector function for condition 1 has an internal release signal which is active if the main
sequence function has classified the angle between V
must be fulfilled for activating the release signals:
V2MinOp
|V |>
2
|3I |> 0.05 ·
0
|3I |>maxIph ·
0
where:
V and 3I
2
V2MinOp
maxIph
The angle difference is phase shifted by 180 degrees if the fault is in reverse direction.
The condition 2 looks at the angle relationship between the negative sequence voltage V
positive sequence voltage V
for shifting phases if the fault is in reverse direction. A phase shift is introduced so that the fault
sectors will have the same angle boarders as for condition 1. If the calculated angle between V
and V lies within one sector, the corresponding phase for that sector will be activated. The
1
condition 2 is released if both the following conditions are fulfilled:
V2MinOp
|V |>
2
V1MinOp
|V |>
1
Line distance protection REL650
Technical manual
Forward
Reverse
en06000385.vsd
IBase
INRelPG
are the magnitude of the negative sequence voltage and zero-
0
sequence current (3I
is the setting parameter for minimum operating negative
sequence voltage
is the maximum phase current
. Since this is a phase-to-phase voltage relationship, there is no need
1
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20°
and I
0 0
)
0
Impedance protection
and I
o
as valid. The following conditions
Section 5
0
and the
2
2
125