ABB REL650 series Technical Manual page 159

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