Toshiba GRL100-701B Instruction Manual page 246

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.
Single-phase
current
source
+
DC
power
−
supply
DC
voltmeter
Figure 6.5.1.1 Testing Phase Current Differential Element
The output signal numbers of the DIF element are as follows.
• 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.
A
Element Signal number
DIF-A 41
DIF-B 42
DIF-C 43
 245 
6 F 2 S 0 8 5 0
GRL100
TB1 -1
TX1
CH1
I a
RX1
-2
TX2
CH2
RX2
A
Monitoring
jack
TB4 -A16
0V
-A17
E