Soft adsorption ultrasonic sensor for GIS partial discharge detection

Abstract

The invention discloses a soft adsorption ultrasonic sensor for GIS partial discharge detection, which comprises a metal inner shell, a piezoelectric vibrator, a sound absorption filler, an output terminal and a silicone rubber outer shell, and is characterized in that the silicone rubber outer shell covers the outer part of the metal inner shell, and the bottom of the silicone rubber outer shell gradually diverges outwards to form an umbrella-shaped negative pressure cavity. The umbrella-shaped negative-pressure cavity is arranged at the bottom of the ultrasonic sensor, the edge of the negative-pressure cavity is coated with an ultrasonic coupling agent during use, the ultrasonic sensor is pressed on the outer surface of the GIS, air in the negative-pressure cavity is pressed out, then the ultrasonic sensor can be adsorbed on the outer surface of the GIS through the negative-pressure effect of the negative-pressure cavity, the suction force is firm, and the ultrasonic sensor is not prone to falling off. Discharge ultrasonic detection can be carried out on the GIS without manual fixation.

Description

technical field [0001] The invention relates to the technical field of partial discharge detection, and more particularly to a soft adsorption ultrasonic sensor used for partial discharge detection of GIS. Background technique [0002] The interior of the GIS is filled with sulfur hexafluoride gas, and its dielectric strength and breakdown field strength are very high. Once a partial discharge occurs inside the GIS, ultrasonic waves will be generated, and the partial discharge ultrasonic signal will propagate to the surroundings in the form of spherical waves. An ultrasonic sensor is placed outside the tank, which can receive the ultrasonic signal generated by the discharge. [0003] At present, the inspectors need to stick the ultrasonic sensor on the outside of the GIS tank for partial discharge ultrasonic inspection. Since the operator needs to hold the sensor for a long time, hand shaking or sliding will affect the partial discharge ultrasonic inspection, resulting in in...

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Problems solved by technology

[0003] At present, it is necessary for inspectors to stick the ultrasonic sensor on the outside of the GIS tank body for partial discharge ultrasonic detection. Since the operator needs to hold the sensor for a long time, hand shaking or sliding will affect the partial discharge ultrasonic detection, resulting in inaccurate detection data. Accurate, at the same time, it is easy to drop to the ground during use, which will cause damage to the sensor

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