ABB Relion REG670, Technical Manual

Page: 224 / 1298

j
R1PP RFPP
X1PP
X1PP
RFPP R1PP
RFPP
RFPP
RFPP
RFPP
R
X
(Ohm/phase)
(Ohm/phase)
IEC11000416-1-en.vsd
j
0 1
3
X PE X RVPE
XNRV
-
=
0 1
3
X PE X FWPE
XNFW
-
=
0 1
3
X PG X FWPG
XNFW
-
=
0 1
3
X PG X RVPG
XNRV
-
=
0 1
3
X PE X RVPE
XNRV
-
=
0 1
3
X PE X FWPE
XNFW
-
=
2 2
2
2
2
2
IEC11000416 V1 EN
Figure 83: ZMFPDIS Characteristic for phase-to-phase measuring, ohm/loop
domain
The faulty loop in relation to the fault type can be presented as in Figure 84 . The main
intention with this illustration is to make clear how the fault resistive reach should be
interpreted and set. Note in particular that the setting RFPP always represents the total
fault resistance of the loop, regardless the fact that the fault resistance (arc) may be
divided into parts like for three-phase or phase-to-phase faults. The R1 + jX1 represent
the positive sequence impedance from the measuring point to the fault location.
Section 7
1MRK502052-UEN B
Impedance protection
218
Technical manual