ABB RELION RET670 - Page 459

A B
E E=
EQUATION1342 V1 EN-US (Equation 375)
resides the center of oscillation on impedance point, see equation 376.
( )
1
7.43 33.9
2
S
CO SA
Z
Z Z j= - = + W
EQUATION1341 V1 EN-US (Equation 376)
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 453
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