Injection exclusion

Injection exclusion is used to ensure that no more than one IM20 is injecting into the same system.

The IM20 injects a low frequency into the system. In a system with several incoming feeders, depending on the circuit breaker position, there must be no more than one IMD injecting into the system.

This injection exclusion is managed by the inhibition input of the IM20, which is connected to the auxiliary contacts of the circuit breakers.

The injection inhibition input can be configured to use an NO contact (injection activated when the contact is open and injection deactivated when the contact is closed) or a NC contact (injection activated when the contact is closed and injection deactivated when the contact is open). The default value is NO.