ABB RELION REX640 Technical Manual page 892

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Protection functions

GUID-93DCB3EB-9200-4566-B4BF-54DBAF25AFE1 V1 EN

The fault loop impedance model for phase-to-earth impedance

measuring elements

Positive-sequence resistance from measuring point to fault location

Positive-sequence reactance from measuring point to fault location

Earth return path resistance = (R

Earth return path reactance = (X

Zero-sequence resistance from measuring point to fault location

Zero-sequence reactance from measuring point to fault location

Physical fault resistance between phase and earth (includes arc and earthing resistances)

Considering the load in case of a single line-to-earth fault, conventional distance

protection might overreach at the exporting end and underreach at the importing end.

DSTPDIS has a load compensation functionality which increases the security in such

applications. Load compensation is enabled with the setting Load Comp zone x (x =

1...5) = "True".

Load compensation is used only with single phase-to-earth faults.

Load compensation is not used if multiple phases are included in the

fault (more than one single earth fault release).

)/3 from measuring point to fault location

)/3 from measuring point to fault location

1MRS759142 C

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