According to pertinent statistics and the experience available, the majority of all arc faults occurring in medium voltage or high voltage systems are triggered by single pole-to-ground faults.
Single pole-to-ground faults in switchgear systems will within a very short time change over to two- or three-pole short circuits.
Functional principle of system protection:
Both the phase error detector and the arc detector are capable of jointly establishing a contact within milliseconds capable of clearly detecting an earth-fault arc within the medium voltage or high voltage systems. The small earth-fault arc is deactivated by the corresponding power circuit breaker even long before the short circuit can wield its destructive effects.
This helps to considerably reduce both the risks to the operating staff and the damaging effects to your switchgear system.