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3I
0
<0.1 · IBase
or
3I
0
<maxIph ·
INRelPG
where:
|3V
0
|
is the magnitude of the zero sequence voltage
V
1
|
is the magnitude of the positive sequence voltage
V
2
|
is the magnitude of the negative sequence voltage
maxIph
is the maximal phase current
Phase-to-phase fault detection
The detection of phase-to-phase fault is performed by evaluation of the angle difference
between the sequence voltages V
2
and V
1
.
0°
300°
180°
A-B sector
B-C sector
C-A sector
60°
ANSI06000383-2-en.vsd
VC
VA
VB
VA (Ref)
ANSI06000383 V2 EN
Figure 67:
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
2
and V
1
lies within the sector defined according to figure
following conditions are fulfilled:
|V
1
|>
V1MinOP
|V
2
|>
V2MinOp
where:
V1MinOP and V2MinOp
are the setting parameters for positive sequence and negative sequence
minimum operate voltages
1MRK 506 335-UUS A
Section 6
Impedance protection
153
Technical manual
Содержание REL650 series
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