| 摘要 |
<p>The Invention concerns to a switchgear with switching device, driven by propellant chemical charge or fast acting switch, with means for current or fault current detection and optical sensor means for light arc or fault light arc detection, according to the preamble of claim 1 without the need of having auxiliary voltage applied. In order to reduce the closing time of an earthing switch, the electrical circuit of an inductive current detection means is electrically connected in series with the light sensing switching path, and this current signal directly ignites the propellant chemical charge or fast acting switch by using a limited electronic device.</p> |
