ABB Relion 670 Series Applications Manual page 455

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1MRK 511 401-UEN Rev. K

The zero sequence voltage for a fault at the remote line end and appropriate fault resistance is

To avoid unwanted trip from the weak-end infeed logic (if spurious signals should occur), set

the operate value of the broken delta voltage level detector (3U0) higher than the maximum

false network frequency residual voltage that can occur during normal service conditions. The

recommended minimum setting is two times the false zero-sequence voltage during normal

service conditions.

Bay control REC670

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