ABB RELION REX640, Техническое руководство, Страница: 522 / 1960

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.
4.2.6.4 Analog channel configuration
HAEFPTOC has one analog group input which must be properly configured.
Table 583: Analog signals
Input Description
IRES Residual current (measured or calculated)
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.
4.2.6.5 Operation principle
The function can be enabled and disabled with the
Operation setting. 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.
Protection functions 1MRS759142 F
522 REX640
Technical Manual