Relay Testing.

* A protective relay test is the review of protective devices in a system. Protective devices and periodic reviews are very important for the safe operation of power supply networks.
* In a Protection relay testing, the following items are tested depending on test type.
* Visual inspection of the relay, and all connection points checked for tightness.
* Control function (i.e. opening and closing of circuit breaker).
* Protection functions and trip times.
* Logic functions.
* Relay binary and analogue inputs/outputs.
* Insulation resistance testing.
* Primary injection testing.
* Secondary injection testing.