| 摘要 |
PURPOSE:To make it possible to detect plural kinds of abnormalities by providing an easily exchangeable band-pass filter permeable only to a signal of the oscillation in a specific frequency band. CONSTITUTION:Partial discharge generating from an insulator of a spacer and the like holding a high voltage conductor 2, etc., and the mixture of a metallic foreign matter are, for example, regarded as abnormalities in a metal container 1, and in any case, this is transmitted to the wall of the container 1 as oscillations or sound waves. The oscillations are detected by an oscillation detector 4 to be transmitted to a receiver 6 through a cable 5 as an electric signal. It is transmitted to an easily exchangeable band-pass filter 9 in the receiver 6, and a signal only in a specific frequency band is detected. According to the constitution, plural kinds of internal abnormalities with different generation frequency can be detected by one abnormality detector. |
