IED
ZB
Line impedance = ZC
ZA = forward source impedance
IEC07000014_2_en.vsd
IEC07000014 V2 EN-US
Figure 237: Line application of pole slip protection
If the apparent impedance crosses the impedance line ZB – ZA this is the detection
criterion of out of step conditions, see figure
238.
Section 8 1MRK 504 163-UUS A
Impedance protection
472 Transformer protection RET670 2.2 ANSI
Application manual
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