Harmonics-Based Earth-Fault Protection Haefptoc - ABB RELION Series Technical Manual

1MRS758755 A
4.2.5
4.2.5.1
4.2.5.2
4.2.5.3
4.2.5.4
REC615 and RER615
Technical Manual

Harmonics-based earth-fault protection HAEFPTOC

Identification
Description
Harmonics-based earth-fault protection
Function block
HAEFPTOC
Io OPERATE
I_REF_RES START
BLOCK
GUID-A27B40F5-1E7D-4880-BBC4-3B07B73E9067 V2 EN
Figure 183: Function block
Functionality
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, if desired.
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
IEC 61850 IEC 60617
identification identification
HAEFPTOC Io>HA
Section 4
ANSI/IEEE C37.2
device number
51NHA
353