ABB RELION Series, Technical Manual

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4.2.2 Directional earth-fault protection (F)DEFxPDEF
4.2.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional earth-fault protection, low
stage
(F)DEFLPDEF Io> -> 67N-1
Directional earth-fault protection, high
stage
DEFHPDEF Io>> -> 67N-2
4.2.2.2 Function block
FDEFLPDEF
Io
Uo
START
OPERATE
BLOCK
ENA_MULT
RCA_CTL
I
2
U
2
DEFHPDEF
Io
Uo
START
OPERATE
BLOCK
ENA_MULT
RCA_CTL
I
2
U
2
GUID-6E1102BE-06F1-4F08-8236-4BC68F189321 V1 EN
Figure 141: Function block
4.2.2.3 Functionality
The earth-fault function (F)DEFxPDEF is used as directional earth-fault protection
for feeders.
The function starts and operates when the operating quantity (current) and polarizing
quantity (voltage) exceed the set limits and the angle between them is inside the set
operating sector. The operate time characteristic for low stage (F)DEFLPDEF and
high stage DEFHPDEF can be selected to be either definite time (DT) or inverse
definite minimum time (IDMT).
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.
4.2.2.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
1MRS758755 A
Section 4
Protection functions
REC615 and RER615 279
Technical Manual