Impedance Characteristic - ABB Relion 670 Series Technical Reference Manual

1MRK505222-UUS C
6.5.2.2
Technical reference manual
A-G B-G
A-G B-G
A-G B-G
A-G B-G
A-G B-G
ANSI07000080 V1 EN
Figure 131: The different measuring loops at line-ground fault and phase-phase fault.

Impedance characteristic

The distance measuring zone include three impedance measuring loops; one fault loop
for each phase.
The distance measuring zone will essentially operate according to the non-directional
impedance characteristics presented in figure 132. The characteristic is illustrated with
the full loop reach.
Zone 1
C-G
Zone 2
C-G
Zone 3
C-G
Zone 4
C-G
Zone 5
C-G
en07000080_ansi.vsd
Section 6
Impedance protection
263