Broken Conductor Detection Element Bcd; Testing Bcd Element - Toshiba GRE110 Instruction Manual

• Enter the signal number to observe the operation at the LED as shown in Section 6.5.1 and
press the ENTER key.
• Apply the three-phase balance current and the operating current value is checked by
increasing the magnitude of the current applied.
Check that the measured value is within 5% of the setting value.
6.5.1.5

Broken conductor detection element BCD

The testing circuit is shown in Figure 6.5.6.
I a
A
Three-phase
I b
A
current
source
I c
A
+
power
supply
−
The output signal of testing element is assigned a configurable LED.
The output signal numbers of the elements are as follows:
• Enter the signal number to observe the operation at the LED as shown in Section 6.5.1 and
press the ENTER key.
• Apply the three-phase balance current at 10% of the rated current and interrupt a phase
current.
Then, check the BCD element operates.
6.5.1.6 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.
• 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 6.5.6 Testing BCD element
Element Signal No.
BCD 81
 171 
6 F 2 T 0 1 7 2
GRE110
TB1
-1
-2
-3
-4
-5
-6
TB1
-13
-14
-12