![ABB RELION Series Technical Manual Download Page 269](http://html1.mh-extra.com/html/abb/relion-series/relion-series_technical-manual_3663191269.webp)
4.2
Earth-fault protection
4.2.1
Non-directional earth-fault protection (F)EFxPTOC
4.2.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Non-directional earth-fault protection,
low stage
(F)EFLPTOC
Io>
51N-1
Non-directional earth-fault protection,
high stage
EFHPTOC
Io>>
51N-2
Non-directional earth-fault protection,
instantaneous stage
EFIPTOC
Io>>>
50N/51N
4.2.1.2
Function block
FEFLPTOC
Io
BLOCK
START
OPERATE
ENA_MULT
EFHPTOC
Io
BLOCK
START
OPERATE
ENA_MULT
EFIPTOC
Io
BLOCK
START
OPERATE
ENA_MULT
GUID-A8CD8E87-2B3B-420B-A4DC-FA88F16DD412 V1 EN
Figure 139:
Function block
4.2.1.3
Functionality
The earth-fault function (F)EFxPTOC is used as non-directional earth-fault
protection for feeders.
The function starts and operates when the residual current exceeds the set limit. The
operate time characteristic for low stage (F)EFLPTOC and high stage EFHPTOC can
be selected to be either definite time (DT) or inverse definite minimum time (IDMT).
The instantaneous stage EFIPTOC always operates with the DT characteristic.
In the DT mode, the function operates after a predefined operate time and resets when
the fault current disappears. The IDMT mode provides current-dependent timer
characteristics.
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.
1MRS758755 A
Section 4
Protection functions
REC615 and RER615
263
Technical Manual
Summary of Contents for RELION Series
Page 1: ... RELION PRODUCT FAMILY Grid Automation REC615 and RER615 Technical Manual ...
Page 2: ......
Page 30: ...24 ...
Page 50: ...44 ...
Page 189: ...3 18 5 Settings 1MRS758755 A Section 3 Basic functions REC615 and RER615 183 Technical Manual ...
Page 206: ...200 ...
Page 514: ...508 ...
Page 714: ...708 ...
Page 786: ...780 ...
Page 796: ...790 ...
Page 798: ...792 ...
Page 803: ...797 ...