Toshiba GRL100-701B, Instruction Manual

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6.5.1.1 Phase current differential element DIF
The phase current differential element is checked for the following items.
Operating current value
Charging current compensation
Percentage restraining characteristic
The top two items are tested locally or under an end-to-end setup of each terminal relay.
The last item is tested only under an end-to-end setup of each terminal relay.
Operating current value
Figure 6.5.1.1 shows the circuit to test the A-phase element locally.
GRL100
Single-phase
current
source
A
TB1 -1
-2
RX1
TX1
Ia
Monitoring
jack
A
0V
DC
voltmeter
TB4 -A16
-A17
E
DC
power
supply
+
−
RX2
TX2
CH1
CH2
Figure 6.5.1.1 Testing Phase Current Differential Element
The output signal numbers of the DIF element are as follows.
Element Signal number
DIF-A 41
DIF-B 42
DIF-C 43
•
Set the [L.test] to “1” (=On) on the “Switch” screen of the “Test” sub-menu.
•
Check that the charging current compensation DIFIC is set to zero on the "Protection element"
screen in the "Setting (view)" sub-menu. If not, set it to zero in the "Setting (change)"
sub-menu.
•
Press 4 (=Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit" screen.
•
Enter a signal number 41 for Term A line to observe the DIF-A operation at monitoring jack A
and press the ENTER key.
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