Table 336: (F)EFLPTOC Technical revision history
Technical revision
Change
B
The minimum and default values changed to
40 ms for the
Operate delay time
setting
C
Start value
step changed to 0.005
D
Added a setting parameter for the "Measured
Io" or "Calculated Io" selection
E
Step value changed from 0.05 to 0.01 for the
Time multiplier
setting
F
Internal improvement
G
Internal improvement
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
Figure 140: 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).
Protection functions
1MRS758755 C
294
REC615 & RER615
Technical Manual
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