Local discharge ultrasonic positioning method based on flexible array sensor

A flexible array, ultrasonic positioning technology, applied in the field of detection, can solve the problems that the array sensor cannot be detected, the array elements cannot be fitted, etc., and achieve the effect of solving the problem of accurate detection.

Active Publication Date: 2017-12-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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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 t

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  • Local discharge ultrasonic positioning method based on flexible array sensor
  • Local discharge ultrasonic positioning method based on flexible array sensor
  • Local discharge ultrasonic positioning method based on flexible array sensor

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[0043] The purpose of the present invention is to provide a positioning method based on the flexible array sensor in view of the insufficient application range of the existing ultrasonic array sensor, so as to realize the accurate positioning of the local discharge source of any electrical equipment.

[0044] The problem of the present invention is achieved by the following technical solutions:

[0045] Principle and implementation steps:

[0046] ①Design of flexible array sensor

[0047] The flexible partial discharge ultrasonic array sensor of the present invention includes a flexible base 3 and a magnet 2 with array holes not less than 3×3. The flexible base 3 is provided with nine array element mounting holes arranged in a square, and the ultrasonic sensor array element 1 is placed in the holes. The front and rear ends of the flexible base 3 are provided with a magnet 2 and a fixing plate, and the fixing plate is provided with a suction cup, so that the sensor array element can b...

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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 ...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1209
Inventor 谢庆张建涛张莹刘怡甘汶艳律方成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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