Function Block; Functionality; Analog Channel Configuration - ABB RELION REX640 Technical Manual

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Protection functions

Function block

GUID-6A982B06-C7DE-4123-AF18-1A6F6927ED4C V1 EN

Function block

The harmonics-based earth-fault protection function HAEFPTOC is used instead of a

traditional earth-fault protection in networks where a fundamental frequency

component of the earth-fault current is low due to compensation.

By default, HAEFPTOC is used as a standalone mode. Substation-wide application

can be achieved using horizontal communication where the detection of a faulty

feeder is done by comparing the harmonics earth-fault current measurements.

The function starts when the harmonics content of the earth-fault current exceeds the

set limit. The operation time characteristic is either definite time (DT) or inverse

definite minimum time (IDMT). If the horizontal communication is used for the

exchange of current values between the protection relays, the function operates

according to the DT characteristic.

The function contains a blocking functionality. It is possible to block function outputs,

timer or the function itself.

HAEFPTOC has one analog group input which must be properly configured.

Analog signals

See the preprocessing function blocks in this document for the

possible signal sources.

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings. For

troubleshooting, check the contents of this chapter and also the preprocessing blocks

in this document. The configuration can be written to the protection relay once the

mismatch is corrected.

Residual current (measured or calculated)

1MRS759142 C

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