Primary Current Injection testing of ACB & MCCB

Primary Current Injection testing of ACB & MCCB

Primary Current Injection testing of ACB & MCCB

The primary injection testing is used to verify the correct installation and operation of the whole protection chain. A predetermined current is injected into the circuit breaker to determine whether the relay will trip at this current and, if so, the time period the current needs to flow before the trip is initiated. Specifically, the test carries out injection of testing a programmed sequence of overload and fault magnitude currents through a circuit breaker and documenting how long it takes the trip unit to activate.

Acceptance and maintenance tests are conducted in the field using a portable primary current injection test set that is specifically designed to be more compact than factory test equipment.