Method and apparatus for detecting foreign matters in gas sealed electric apparatus
AssigneesTokyo Shibaura Denki Kabushiki Kaisha, Tokyo Denryoku Kabushiki Kaisha
InventorsShinichi Menju, Kunio Takahashi, Eiichi Haginomori, Yoichi Murakami, Eiichi Zaima
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Abstract
In a method for detecting foreign matters present in gas sealed electrical apparatus including a tank at the ground potential and containing an insulating gas and a high voltage live part disposed in the tank, a voltage is applied to the high voltage live part causing generation of ultrasonic waves and the ultrasonic waves propagated through the tank is sensed by a sensing element mounted on the tank.
Claims2
In a method for detecting for the presence of foreign matter in a gas sealed electrical apparatus including a tank at ground potential and containing an insulating gas and having a high voltage live element disposed in the tank, the improvement which comprises:
- applying a voltage to the high voltage live element for causing generation of ultrasonic waves by collision of foreign matter with the tank, said waves being propagated through the tank;
- sensing the ultrasonic waves produced by said collision which are propagated through the tank;
- and,
- indicating the magnitude of the sensed ultrasonic waves to enable determination of the shape of the foreign matter.
Dependencies are inferred from the claim text.