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6.5.1.7
Broken conductor detection element BCD
The testing circuit is shown in Figure 6.5.9.
I a
A
Three-phase
I b
A
Current
source
I c
A
+
DC
power
−
supply
+
DC
voltmeter
0V
The output signal of testing element is assigned to the monitoring jack A.
The output signal numbers of the elements are as follows:
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
• Apply the three-phase balance current at 10% of the rated current and interrupt a phase
current.
Then, check the BCD element operates.
6.5.1.8
Cold load protection
The testing circuit is same as the circuit shown in Figure 6.5.1.
To check the cold load protection function, the scheme switch [CLPTST] in the "Switch" screen
on the "Test" menu is used. Test the item of OC1 shown in Section 6.5.1.1.
• Set the scheme switch [CLPTST] to "S0".
Check that the OC1 operates at the setting value of normal setting group.
• Next, set the scheme switch [CLPTST] to "S3".
Check that the OC1 operates at the setting value of cold load setting group [CLSG].
Figure 6.5.9 Testing BCD element
Element
Signal No.
BCD
130
⎯
⎯
263
GRD150
TB1
-1
-2
-3
-4
-5
-6
A
Monitoring
jack
0V
TB4
-18
-19
-20
(E)
6 F 2 S 0 8 4 2
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