Current Injector, For Industrial

The field-testing and calibration of solid-state trip units can be performed by either primary current injection method or secondary current injection method. Current injection testing is generally associated with high current and high voltage power distribution systems in electricity substations or in a large industrial installations. By injecting a predetermined current into the circuit breaker, it is possible to determine whether the relay will trip at this current and, if so, how long the current needs to flow before the trip is initiated. Primary current injection testing is an invaluable aid to fault-finding.