Frequently asked questions
Will replacing the internal battery on a Micom P22x relay cause the protection relay to trip the circuit breaker?
29 September 2021Issue
An internal battery on a Micom P22x relay is required to be replaced without the relay tripping the circuit breaker.
Micom P22x Energy Automation
MiCOM P225 relays have a battery to maintain status data and the correct time if the auxiliary supply voltage fails. The data maintained includes event, fault and disturbance records and the thermal state at the time of failure. The battery is required to be replaced when it reaches it's end-of-life.
Whenever the battery is removed, the relay will display a 'BATTERY ERROR' alarm and will NOT cause the protection relay to trip the circuit breaker. 'BATTERY ERROR' is considered a 'minor fault' and the protective relay continues to function in the event of a minor equipment failure.
The alarm 'BATTERY ERROR' appears if the 3.6 V Lithium battery located on the front panel is flat, missing or incorrectly positioned. This alarm is also displayed if the voltage across the battery is less than 3.5V.
As this is a minor alarm, it is possible to disable monitoring (which clears the alarm) by setting "BATTERY ALARM" to NO via the (ALARM CONFIG. sub-menu.)