ABB REG670 - Page 248

R1PE+RNFw
RFFwPE
X1FwPE+XNFw
X1RvPE+XNRv
RFFwPERFRvPE
RFFwPE
RFRvPE
RFRvPE
R
X
(Ohm/loop)
(Ohm/loop)
IEC11000417-1-en.vsd
j
N
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 FwPE
XNFw
-
=
0 1
3
R PE R PE
RNFw
-
=
j
N
j
N
1
1
X RvPE
XNRv XNFw
X FwPE
= ×
R1PE+RNRv
IEC11000417 V1 EN
Figure 95: ZMFCPDIS Characteristic for phase-to-earth measuring loops, ohm/
loop domain
Section 7 1MRK502052-UEN B
Impedance protection
242
Technical manual