| 摘要 |
An arc fault circuit breaker includes line and load terminals, separabl e contacts electrically connected between the terminals, a current sensor adapted to sense current associated with a load and flowing between the terminals and through the separable contacts. An arc fault detection circuit provides series arc protection and generates a trip signal responsive to the sensed current. The arc fault detection circuit collects a plurality of samples of the sensed current over plural li ne cycles, determines that the load is a dimmer-controlled load, determines a phase ang le at which the sensed current begins conduction within one of the line cycles, an d determines that the phase angle consistently moves in a forward direction or a reverse direction. If so, then series arc protection is responsively inhibited. An operating mechanism opens the separable contacts responsive to the trip signal.</SDOAB >
|
