Automatic Trip Curve Tests with Custom Test Points

It is recommended that you follow the guidelines while defining the custom test points:

• Decimal values for the injection current are considered as invalid inputs.

• The selected protection trip type must match the segment of the time-current curve to be tested. If an incorrect value is selected, the test results may be misleading. For example:

  • If you select the short-time protection trip type and enter the injection current value within the short-time current range, then the MicroLogic trip unit will trip in short-time segment. This will indicate a Passed test status.

  • If you select the short-time protection trip type and enter the injection current value within the long-time current range, then the MicroLogic trip unit will trip in long-time segment.

    The test results will not display the cause of the trip. As the circuit breaker has tripped, the test results will indicate a Passed test status.

  • If you want to test the ground fault protection but select any protection type that inhibits ground fault protection, then the test results will be incorrect.