| 摘要 |
<p>PURPOSE: To provide a portable partial discharge detector for a gas insulation device which is less influenced by external noises present in the air and has superior detecting accuracy. CONSTITUTION: A plurality of band pass filters 21a, 21b pre set, which allow only signals of specific frequencies different from each other to pass therethrough. High frequency switches 22a, 22b are connected before and after the filter 21a, and high frequency switches 22c, 22d are connected before and after the filter 21b. Among the switches, a detection electrode 4 is connected to the switch 22a, and a wide band amplifier 23a is connected to the switch 22b. Moreover, the amplifier 23a is connected to the filter 21b via the switch 22c. Further, a display meter 12 is connected to the switch 22d via a wave detection circuit 24, an amplifier 23b and a display driver circuit 25.</p> |
