ABB Relion 670 series - Page 267

RFPG
X1+Xn
X1+Xn
RFPGR1+RnRFPG
RFPG
RFPG
RFPG
R
X
R1+Rn
(Ohm/loop)
ANSI05000661-3-en.vsd
R0-R1
Rn
3
=
X0-X1
Xn
3
=
j
n
j
n
(Ohm/loop)
ANSI05000661 V3 EN-US
Figure 123: Characteristic for phase-to-ground measuring , ohm/loop domain
1MRK 502 066-UUS B Section 7
Impedance protection
261
Technical manual