ABB Relion 670 series, Technical Reference Manual

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en07000080_ansi.vsd
A-G B-G C-G
A-G B-G C-G
A-G B-G C-G
A-G B-G C-G
A-G B-G C-G
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
ANSI07000080 V1 EN
Figure 131: The different measuring loops at line-ground fault and phase-phase fault.
6.5.2.2 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.
1MRK505222-UUS C
Section 6
Impedance protection
263
Technical reference manual