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The use of wattmetric protection gives a possibility to use the dedicated inverse
definite minimum time characteristics. This is applicable in large high-impedance
earthed networks with a large capacitive earth-fault current.
In a network employing a low-impedance earthed system, a medium-size neutral
point resistor is used. Such a resistor gives a resistive earth-fault current
component of about 200...400 A for an excessive earth fault. In such a system,
the directional residual power protection gives better possibilities for selectivity
enabled by the inverse time power characteristics.
4.2.6.8
Signals
Table 397: WPWDE Input signals
Name
Type
Default
Description
Io
SIGNAL
0
Residual current
Uo
SIGNAL
0
Residual voltage
BLOCK
BOOLEAN
0=False
Block signal for acti-
vating the blocking
mode
RCA_CTL
BOOLEAN
0=False
Relay characteristic
angle control
Table 398: WPWDE Output signals
Name
Type
Description
OPERATE
BOOLEAN
Operate
START
BOOLEAN
Start
4.2.6.9
Settings
WPWDE Group settings
Table 399: WPWDE Group settings (Basic)
Parameter
Values (Range)
Unit
Step
Default
Description
Directional mode
2=Forward
3=Reverse
2=Forward
Directional mode
Current start value 0.010...5.000
xIn
0.001
0.010
Minimum operate
residual current for
deciding fault di-
rection
Voltage start value 0.010...1.000
xUn
0.001
0.010
Start value for re-
sidual voltage
Power start value
0.003...1.000
xPn
0.001
0.003
Start value for re-
sidual active power
Reference power
0.050...1.000
xPn
0.001
0.150
Reference value of
residual power for
Wattmetric IDMT
curves
Characteristic an-
gle
-179...180
deg
1
-90
Characteristic an-
gle
Table continues on the next page
Protection functions
1MRS758755 C
386
REC615 & RER615
Technical Manual
Содержание Relion REC615
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