To check the operation of protective relays such as overload, over current, reverse power etc., injection tests are carried out. Basically injection tests are of two types – primary and secondary injection tests. There is a very minor difference between these two tests. While primary injection tests are performed when the circuit is operating, secondary injection tests are conducted when the circuit is not carrying any current. Secondary Injection tests are usually preferred over the former.
How is a secondary injection test performed?
First of all, protective relays are disconnected from normal voltage or current source. The relays are then connected to special testing equipment called a secondary injection test kit. These secondary injection test kits inject the operating signal into the protective relay so that it starts working and is also capable of recording it for further analysis.
Buy secondary injection test kits
For proper conduction of injection test, you need the best equipment available, as faulty equipment may harm your devices. Protec is a the leading electrical test equipment rental and retail supplier. We stock secondary injection test kits from all major manufacturers and you can easily rent or buy any electrical test equipment from us.
ETI PI-6000 Primary Circuit Breaker Test Set