Ampcontrol Pty Ltd
– ABN 28 000 915 542
OCS USER MANUAL
MAG-182 Version 5
– FEB/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 31 of 72
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7.1.3 Earth Leakage CT Failure Protection
Table 6: Protection Element - Earth Leakage CT Failure Trip Characteristics
Parameter
Action
Power Cycle
Trip status maintained
Reset
Requires a general reset after the trip condition has cleared
Trip Actions
Open Main Contactor
Prevent Main Contactor from closing
Active Period
Always active
Logging
Always logged
Parameters
None (Trip time and level is fixed)
Monitoring
CT Detect trip status bit
The Protection Element generates a CT Detection Signal to test the integrity of earth leakage circuit.
The CT Detection signal continually tests the earth leakage current transformer, the wiring loop to the
transformer and the input to the protection relay as required by AS/NZS 2081: 2011.
The signal is fed from Pin 6 of the Protection Element. Pass one loop through the earth leakage current
transformer then back to Pin 7.
The Earth Leakage CT Failure trip time is fixed at 4.5 seconds.
NOTE
The
loop resistance
of the CT Detection Signal circuit must remain
below 1Ω
.
7.2 Residual Voltage
7.2.1 Trip Characteristics
Table 7: Protection Element
– Residual Voltage Trip Characteristics
Parameter
Action
Power Cycle
Trip status maintained
Reset
Requires a residual voltage reset after the trip condition has cleared
Trip Actions
Open Main Contactor
Prevent Main Contactor from closing
Active Period
Always active
Logging
Always logged
Parameters
Trip Level
Trip Time
Monitoring
Residual Voltage displayed as voltage
