Automatic Trip Curve Tests

The automatic trip curve test provides an automated test of the circuit breaker’s time-current curve, allowing the Service Interface to verify long-time, short-time, instantaneous, and ground-fault protection.

The Service Interface injects digital or analog signals based on MicroLogic trip unit type and the circuit breaker’s pickup and delay settings. The Service Interface measures the duration of the applied test signal before the circuit breaker trips. This data is automatically compared to the circuit breaker’s time-current curve to determine if the device is within tolerance. This comparison of data determines which specific protection functions have passed or failed.

To perform the automatic trip curve test, select one of the following options:

• Preconfigured test point: The test points are preconfigured and selected to minimize the test time required to test each trip curve segment.

• Custom test point: You can define the test points by entering the secondary injected test current and time.