| 摘要 |
<p>The voltage detector for electric conductors, in particular overhead conductors, has a contact electrode (43) which is suitable for making contact with the conductor to be inspected, and a signalling device (44) one of whose terminals is connected to the contact electrode. The other terminal is connected to a capacitive earth (45). The contact electrode is mounted on an insulating support which encloses the signalling device and the capacitive earth. A piezoelectric generator (50) is permanently connected, in parallel w.r.t. the contact electrode, to the first terminal of the signalling device. This device alltonomously supervises the working order of the appts. Between the contact electrode and the piezoelectric voltage generator on one hand and the signalling device on the other hand, a rectifier (56) and a relaxation circuit (57) is interposed for use as a pulsed signalling device supply.</p> |
