ABB Relion 670 series, Technical Reference Manual

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directional element that works on a per phase base. The release signals are per phase
and to have a release of a measuring element in a specific phase both the additional
directional element, and the normal directional element, for that phase must indicate
correct direction.
en06000419_ansi.vsd
Normal
directional
element
A, B, C
Additional
directional
element
Release of distance
measuring element
A, B, C
AND per
phase
AND
ANSI06000419 V1 EN
Figure 145: Ground distance element directional supervision
6.6.3 Function block
ANSI06000422-2-en.vsd
ZDMRDIR (21D)
I3P*
V3P* DIR_CURR
DIR_VOLT
DIR_POL
PUFW
PUREV
STDIRCND
ANSI06000422 V2 EN
Figure 146: ZDMRDIR (21D) function block
ANSI06000425-2-en.vsd
ZDARDIR
I3P*
V3P*
I3PPOL*
DIRCND FWD_G
REV_G
DIREFCND
ANSI06000425 V2 EN
Figure 147: ZDARDIR function block
Section 6
1MRK505222-UUS C
Impedance protection
282
Technical reference manual