Primary Injection

Primary and secondary current injection tests are normally conducted to check the operation of circuit breaker and their protective relays/devices.

The protective devices installed vary from circuit to circuit depending on the protection needs and philosphy but typical relays/devices include overload, over current, reverse power, earth fault, differential protection, etc., etc.

Primary injection testing normally involves injecting the actual current required to operate a protective device power through the circuit breaker.

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