| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a partial discharge-diagnosing apparatus which efficiently and surely distinguishes a partial discharge which occurs inside a gas-insulated electric apparatus and an external noise invading from outside. SOLUTION: A directive sensor 1e is set inside a grounding tank 10 of a bushing 11. An observation apparatus 2e, a detection apparatus 7e and an instruction apparatus 9 are connected to the sensor 1e. At a gas-insulated electric apparatus main body 32, sensors 1a-1d are set at spacers 21a-21d at a connection mother pipe 34, and observation apparatuses 2a-2d and judgment apparatuses 7a-7d are connected to these sensors 1a-1d When a noise is detected by the sensor 1e and judged as an external noise by the judgment apparatus 7e, an instruction signal is output from the instruction apparatus 9 to the observation apparatuses 2a-2d. Operations of the observation apparatuses 2a-2d are stopped during the time.</p> |
