ABB Relion 670 Series Technical Reference Manual page 183

1MRK505222-UUS C
Technical reference manual
RFPP
2
X1
RFPP
2
RFPP
R1
2
IEC11000428 V1 EN
Figure 76: Characteristic for phase-to-phase measuring
The fault loop reach with respect to each fault type may also be presented as in
figure 77. Note in particular the difference in definition regarding the (fault) resistive
reach for phase-to-phase faults and three-phase faults.
(Ohm/phase)
X
R1 RFPP
2
XNRV
XNRV
XNRV
XNFW
XNFW
XNFW
j j
R
RFPP
2
X1
RFPP
2
IEC11000428-1-en.vsd
Section 6
Impedance protection
-
X PE X RVPE 0 1
= -
X PG X RVPG 0 1
-
= X PE X RVPE 0 1
3
=
3
3
-
X PE X FWPE 0 1
- -
= X PE X FWPE X PG X FWPG 0 0 1 1
=
=
3
3
3
(Ohm/phase)
177