ABB RELION RET670 Applications Manual page 478
Relion 670 series transformer protection version 2.2 ansi
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Also See for RELION RET670:
- Applications manual (888 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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Section 8
Impedance protection
472
ZB
IED
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.
ZA = forward source impedance
Line impedance = ZC
1MRK 504 163-UUS A
IEC07000014_2_en.vsd
Transformer protection RET670 2.2 ANSI
Application manual
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