ABB RELION REX640 Technical Manual page 522

Protection and control

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Protection functions

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.

Analog channel configuration

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

Table 583: Analog signals

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.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of HAEFPTOC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

See the preprocessing function blocks in this document for the possible

signal sources.

Residual current (measured or calculated)

Operation setting. The

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