Calibration method and device for a gis partial discharge ultrasonic detection device

Abstract

A calibration method for a gas insulated switchgear (GIS) partial discharge ultrasonic detection device comprises the steps of applying pulse voltage excitation on a transmitting transducer positioned on one side of a platform to generate ultrasonic vibration, measuring response characteristics of a to-be-detected sensor on the other side of the platform, and achieving sensitivity calibration of the GIS partial discharge ultrasonic detection device. A calibration device special for the method is provided with a round aluminum desktop calibration platform, a reference ultrasonic sensor or the to-be-detected ultrasonic sensor is arranged on the surface of a desktop, the transmitting transducer is arranged on the lower surface of the desktop, the reference ultrasonic sensor and the to-be-detected ultrasonic sensor are connected with the partial discharge ultrasonic detection device through a pre-amplifier, the transmitting transducer is connected with a pulse signal source, and coupling pressing mechanisms are arranged on the upper portion and the lower portion of the desktop. The pulse signal source is utilized to excite the transmitting transducer, and stable calibration ultrasonic pulse signals are generated on the calibration platform to perform sensitivity calibration on the partial discharge ultrasonic detection device. The method is simple and convenient to operate and good in calibration repeatability and is an effective quantitative evaluation method for the GIS partial discharge ultrasonic detection device.

Description

technical field [0001] The invention relates to a calibration method of a GIS partial discharge ultrasonic detection device. The invention also relates to a calibration device of the GIS partial discharge ultrasonic detection device specially used for the method. Background technique [0002] Partial discharge is a discharge phenomenon that occurs in a local area of ​​a metal-enclosed gas-insulated combined electrical appliance (GIS). If partial discharge exists for a long time, it will cause insulation damage, resulting in a penetrating breakdown inside the GIS. At present, the GIS partial discharge ultrasonic detection device widely used in the power grid can realize the detection and accurate positioning of internal discharge during GIS operation, and plays an important role in timely discovering hidden dangers of equipment. [0003] However, there is currently a lack of necessary calibration methods to quantitatively test and evaluate the sensor sensitivity and system d...

AI Technical Summary

Problems solved by technology

The key to the calibration of the ultrasonic sensor comparison method is how to obtain a stable and reliable mechanical sound source. At present, methods such as pencil core fracture, capillary glass tube fracture, and steel ball collision are mainly used, and elastic waves are generated by releasing step force. However, these methods It is very easy to introduce many human factors, and the repeatability is not ideal

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