|3V
0
|>V
1
| · 0.2
|V
1
|> VBase · 0.2/√(3)
and
3I
0
<0.1 · IBase
or
3I
0
<maxIph · INRelPG
where:
3V
0
is the magnitude of the zero sequence voltage
V
2
is the magnitude of the negative sequence voltage at the relay measuring point of
phase A
k5 is design parameter
ILmax is the maximal phase current
IMinOp
is the setting of minimum operate phase current in % of
IBase
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 149: Definition of fault sectors for phase-to-phase fault
1MRK505222-UUS C Section 6
Impedance protection
293
Technical reference manual
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