AB
AB
-I
ZPP
arg
-(-I
ZRevPP)
V
V
×
×
b =
æ
ö
ç
÷
è
ø
EQUATION1792-ANSI V1 EN
(Equation 35)
where
V
EQUATION1801 V1 EN
is the V
AB
voltage
ZRevPP
is the positive sequence impedance setting for phase-to-phase fault in reverse direction
ZPP
I
AB
•
AB
comp1
V
=
V
ß
I
AB
jX
I
AB
R
-
ZPP
I
AB
•
vPP
Re
Z
AB
I
•
V
V
Vcomp2
=
·
-
=IF
·ZF =V
AB
en07000110_ansi.vsd
ANSI07000110 V1 EN
Figure 119:
Simplified offset mho characteristic and voltage vectors for phase A-to-
B fault.
Operation occurs if 90≤β≤270.
Offset mho, forward direction
When forward direction has been selected for the offset mho, an extra criteria beside
the one for offset mho (90<β<270) is introduced, that is the angle φ between the
voltage and the current must lie between the blinders in second quadrant and fourth
quadrant. See figure
. Operation occurs if 90≤β≤270 and
ArgDir≤φ≤ArgNegRes
.
1MRK505222-UUS C
Section 6
Impedance protection
247
Technical reference manual
Содержание Relion 670 series
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