| 摘要 |
The invention relates to a power switch configured for the purposes of pr eventing accidental arcs in a low-voltage switchgear. The invention provides the power switch with an overcurrent evaluation means responding to an acci dental arc produced in the switchgear. An overcurrent signal 104 arriving fr om the arc monitoring system LBS (occurrence of the flash of an accidental a rc) is linked to the signal 103 for triggering the control means via a first evaluation means S1, 182, 63 for evaluating the intensity of the overcurren t originating from the accidental arc. The means 70 for triggering the power switch is activated, on issuing of a turn-off pulse 200, merely if the sign al 180 from the current detection means 80 is above a preadjustable threshol d S1. The invention allows the power switch to cut off more rapidly an overc urrent based on an accidental arc.
|
