A partial discharge ultrasonic localization method based on flexible array sensors

Abstract

A local discharge ultrasonic positioning method based on a flexible array sensor; the method comprises the following steps: using the flexible array sensor to collect supersonic wave signals on the outer surface of detected electric equipment; using Euler transformation to transform a radiation direction in a local coordinate system into a radiation direction in a global coordinate system; using a dimension reduction MUSIC algorithm to solve estimation values of a local discharge source azimuth and a pitch angle; determining a connecting line between the sensor and the local discharge source according to the estimation values and known sensor coordinates; finally solving crossing points of the connecting line between sensor in many measuring positions and the local discharge source, thus obtaining the local discharge source accurate position. The method uses the flexible array sensor to collect the supersonic wave signals in the detected electric equipment, thus ensuring each array element to excellently attach to the electric equipment surface, well solving the accurate detection problems of the electric equipment local discharge source in a random shape, and providing effective paths for analyzing and determining the equipment internal fault severe level.

Description

technical field [0001] The invention relates to a method capable of accurately detecting partial discharge faults in electrical equipment, and belongs to the technical field of detection. Background technique [0002] For electrical equipment with a complex structure, the degree of insulation degradation not only depends on the type of partial discharge, the number of discharge sources, and the magnitude of the discharge energy, but also is closely related to the discharge location. Therefore, it is very necessary to detect the position of the discharge source inside the electrical equipment in order to analyze and judge the severity of its internal faults. [0003] Partial discharge ultrasonic array detection method is a new method that applies array sensor and array signal processing technology to partial discharge ultrasonic detection. For direction of arrival estimation and spatial positioning, this method has a high detection success rate and positioning accuracy, and ...

AI Technical Summary

Problems solved by technology

[0004] The existing ultrasonic array sensors are all planar array sensors, which are only suitable for electrical equipment with a flat surface. When the surface of the electrical equipment is not flat, some array elements of the array sensor cannot fit well with the surface of the electrical equipment. Array sensors cannot detect

Images