| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain reduction in the size and weight of a gas insulation electric apparatus. SOLUTION: An electromagnetic wave by partial discharge generated in a gas insulation electric apparatus is detected by an antenna 1. Antenna output is inputted in diagnostic parts 4-6 through a band-pass filter 2. The band-pass filter 2, which is capable of passing through a frequency zone generated by the partial discharge in the gas insulation electric apparatus, is applicable. Other electromagnetic wave signals of noise are not inputted in the diagnostic parts 4-6, so that it is possible to improve the sensitivity of a diagnostic device. The diagnostic parts 4-6 are constituted of a comparator 4 respectively, which outputs a signal, when the level of an input signal exceeds a reference level Vref and operates a signal generator 5 to sound a buzzer 6.</p> |
