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3
APPLICATION NOTES – TESTING SPECIFIC DEVICES
3.1
Secondary Injection of an Over-Current Relay
Figure 3.1 Secondary injection of over-current relay
3.1.1
Timer Mode
Internal start
3.1.2
Connections
Connect the relay current coil to the most appropriate output on the CU-Ps (5V 100A or 15V
33A).
Connect the trip contacts on relay under test to contact set 1 on the CU-Ps.
3.1.3
Test Procedure
Switch on the main supply switch.
Set the metering range switch to the most appropriate secondary injection range (10A, 20A or
100A). Set the timer mode switch to the off position.