ABB PQFA Instruction Manual page 87

3. When the filter is running, opening of the main incoming circuit breaker
when
– one of the above named events persists
– the breaker detects an overcurrent
– the system detects an AC undervoltage
– the system desynchronises from the network
– the system detects a DC capacitor over- or undervoltage
– an internal controller problem is encountered
A short-circuit/overcurrent protection on RMS and peak value internal to the
IGBT-modules
Asea Brown Boveri Jumet S.A.
PQFA Instructions Manual
87