ABB RED650 - Page 144

1
1
S
CO SA
B
A
Z
Z Z
E
E
= -
+
EQUATION1340 V1 EN-US (Equation 79)
In particular cases, when
A B
E E=
EQUATION1342 V1 EN-US (Equation 80)
The center of oscillation resides on the impedance point according to equation 81.
( )
1
7.43 33.9
2
S
CO SA
Z
Z Z j= - = + W
EQUATION1341 V1 EN-US (Equation 81)
Section 7 1MRK 505 393-UEN B
Impedance protection
138 Line differential protection RED650 2.2 IEC
Application manual