ABB Relion 670 series - Phase-To-Ground Fault

The PHSELZ or DLECND output contains, in a similar way as DIRCND, binary coded information, in
this case information about the condition for opening correct fault loop in the distance measuring
element. It shall be connected to the PHSEL input on the ZMQPDIS, distance measuring block.
The code built up for release of the measuring fault loops is as follows:
PHSEL = AG*1+BG*2+CG*4+AB*8+BC*16+CA*32
7.2.6.1 Phase-to-ground fault
M13140-22 v3
Index PHS in images and equations reference settings for Phase selection with load
encroachment function FDPSPDIS (21).
( , )
( , )
PHSn
VA B C
IA B C
Z =
EQUATION1554 V1 EN-US (Equation 45)
where:
n corresponds to the particular phase (n=1, 2 or 3)
The characteristic for FDPSPDIS (21) function at phase-to-ground fault is according to figure 83.
The characteristic has a fixed angle for the resistive boundary in the first quadrant of 60°.
The resistance RN and reactance XN are the impedance in the ground-return path defined
according to equation
46 and equation 47.
0 1
3
R R
RN
-
=
EQUATION1256 V1 EN-US
(Equation 46)
0 1
3
X X
XN
-
=
EQUATION1257 V1 EN-US (Equation 47)
Section 7 1MRK 502 066-UUS B
Impedance protection
202
Technical manual