introduced so that the fault sectors will have the same angle boarders as for condition 1.
If the calculated angle between V
2
and V
1
lies within one sector, the corresponding phase
for that sector will be activated. The condition 2 is released if both the following
conditions are fulfilled:
|V
2
|>
V2MinOp
|V
1
|>
V1MinOp
where:
|V
1
| and |V
2
|
are the magnitude of the positive and negative sequence voltages.
V1MinOP and V2MinOP
are the setting parameters for positive sequence and negative sequence
minimum operating voltages.
20°
140°
260°
AG sector
CG sector
BG sector
V1A
(Ref)
en06000413_ansi.vsd
ANSI06000413 V1 EN
Figure 70:
Condition 2: V
2
and V
1
angle relationship
If both conditions are true and there is sector match, the fault is deemed as single phase-to-
ground. If the sectors, however, do not match the fault is determined to be the complement
of the second condition, that is, a phase-to-phase-to- ground fault.
Condition 1 and
Condition 2 ⇒
Fault type
CG
CG
CG
BG
AG
BCG
The sequence phase selector is blocked when ground is not involved or if a three-phase
fault is detected.
Section 6
1MRK 506 335-UUS A
Impedance protection
156
Technical manual
Содержание REL650 series
Страница 1: ...Relion 650 series Line distance protection REL650 ANSI Technical manual ...
Страница 2: ......
Страница 42: ...36 ...
Страница 48: ...42 ...
Страница 58: ...52 ...
Страница 68: ...62 ...
Страница 74: ...68 ...
Страница 194: ...188 ...
Страница 534: ...528 ...
Страница 580: ...574 ...
Страница 722: ...716 ...
Страница 792: ...786 ...
Страница 855: ...849 ...