246
6
F
2
S
0
8
5
0
•
Apply a test current and change the magnitude of the current applied and measure the value at
which the element operates.
•
Check that the measured value is within 7% of the setting DIFI1.
Charging current compensation
The charging current compensation function is checked by displaying the differential current on
the LCD.
Figure 6.5.1.2 shows the test circuit.
Single-phase
voltage
source
A
φ
V
TB1 -11
V a
Single-phase
current
source
DC
voltmeter
-14
TB1
-2
-1
-A16
-A17
E
TB4
I a
GRL100
DC
power
supply
+
−
RX1
TX1
Monitoring
jack
A
0V
TB4 -A9
-B11
RX2
TX2
CH1
CH2
Figure 6.5.1.2 Testing Charging Current Compensation
•
Set the [L.test] to “1” (=On) on the “Switch” screen of the “Test” sub-menu.
When the charging current compensation is in operation, the differential current Id is expressed
with the following equation:
Id = I – (1/n) DIFIC
where,
I = applied test current
n = 2 in case of two-terminal line application
= 3 in case of three-terminal line application
DIFIC = setting of charging current compensation
•
Open the "Metering" screen in the "Status" sub-menu.
•
Apply a rated phase voltage and a test current to A-phase, and adjust the voltage lagging by
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Summary of Contents for GRL100-701B
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