Toshiba GRL100-701B Instruction Manual page 247

• 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
Single-phase
current
source
+
DC
power
−
supply
DC
voltmeter
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 I d is expressed
with the following equation:
I d = 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
V
φ
 246 
6 F 2 S 0 8 5 0
GRL100
TB1 -11
TX1
V a
CH1
RX1
-14
TX2
CH2
RX2
TB1
-1
I a
-2
A
TB4 -A9
Monitoring
jack
0V
-B11
TB4
-A16
-A17
E