where
AB
V
EQUATION1790-ANSI
V1 EN
is the voltage vector difference between phases A and B
AB
I
EQUATION1791-ANSI
V1 EN
is the current vector difference between phases A and B
Z
is the positive sequence impedance setting for fault
V
pol
is the polarizing voltage
The polarized voltage consists of 100% memorized positive sequence voltage (VAB for
phase A to B fault). The memorized voltage will prevent collapse of the mho circle for
close in faults.
Operation occurs if 90≤β≤270
Z
I
AB
•
AB
comp
V
=
V
ß
I
AB ·
X
I
AB
·R
-
Z
I
AB
•
AB
V
pol
V
ANSI09000116-1-en.vsd
ANSI09000116 V1 EN
Figure 41:
Simplified mho characteristic and vector diagram for phase A-to-B fault
Offset Mho
The characteristic for offset mho is a circle where two points on the circle are the setting
parameters
Z
and
ZRev
. The vector Z in the impedance plane has the settable angle
LineAng
and the angle for
ZRev
is
180°
.
Section 6
1MRK 506 335-UUS A
Impedance protection
112
Technical manual
Содержание REL650 series
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