ABB REG670 - Page 223

RFPE
X1PE+Xn
X1PE+Xn
RFPE
R1PE+Rn
RFPE
RFPE
RFPE
RFPE
R
R1PE+Rn
(Ohm/loop)
IEC11000415-1-en.vsd
X0PE-X1PE
Xn
3
=
R0PE-R1PE
Rn
3
=
j
N
j
N
X (Ohm/loop)
IEC11000415 V1 EN
Figure 82: ZMFPDIS Characteristic for phase-to-earth measuring, ohm/loop
domain
1MRK502052-UEN B Section 7
Impedance protection
217
Technical manual