Method for monitoring corona discharge through ultraviolet imaging instrument

A technology of ultraviolet imaging and corona discharge, which is applied in the direction of using optical methods for testing, testing dielectric strength, etc., can solve problems affecting the safety and system stability of GIS equipment, achieve easy hardware implementation, excellent effect, and reduce annoying effects Effect

Inactive Publication Date: 2017-12-22
STATE GRID CORP OF CHINA +2
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However, electrical insulation defects caused by partial discharge direct...

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  • Method for monitoring corona discharge through ultraviolet imaging instrument
  • Method for monitoring corona discharge through ultraviolet imaging instrument
  • Method for monitoring corona discharge through ultraviolet imaging instrument

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0040] A method for monitoring corona discharge using an ultraviolet imager, which applies digital image processing technology to pictures taken by an ultraviolet imager, can diagnose early faults of GIS equipment, and provide relatively clear fault attributes, severity and The location of the fault, etc., avoids the problem of late detection by infrared thermal imaging technology, provides a more reliable basis for further evaluation of the operation of the equipment, and ensures the healthy and stable operation of the electrical equipment of the substation.

[0041] The method of the invention completes the detection of the discharge area and the discharge degree through three steps. First of all, it is necessary to filter and denoise the pictures taken by the ultraviolet imager. The method used is to use the morphological operator to directly process the grayscale ...

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Abstract

The invention discloses a method for monitoring the corona discharge through an ultraviolet imaging instrument, and the method comprises the steps: combining the opening and closing operation of mathematical morphology expansion and erosion with the median filtering for the filtering of an image; carrying out the threshold segmentation of an ultraviolet image, wherein the selection of the threshold value depends on the mean value and square characteristics of the image, different collection systems can adaptively select the threshold values, so the method, compared with a fixed-threshold image segmentation method is better in effect; carrying out the edge detection, wherein the edge detection partly employs the Canny operator widely used in the image field. Through the edge detection of a binary image, the coordinates of edge points can be obtained, and the method achieves the precise positioning of a fault region. Meanwhile, the area of the fault region can be calculated, and the judgment of the fault degree is facilitated. The method can achieve the monitoring of the discharge phenomenon of electrical equipment, determines the corona position and strength, achieves the diagnosis of an early fault, and further provides more reliable basis for the operation condition of estimation equipment.

Description

technical field [0001] The invention relates to the field of corona discharge detection, in particular to a method for monitoring corona discharge using an ultraviolet imager. Background technique [0002] With the rapid development of my country's power industry, the modern power system is developing in the direction of large power grids, large units, ultra-high voltage, and large capacity. In order to ensure the stability and reliability of the power system, the insulation level of power equipment has also been raised. higher requirement. GIS equipment has a compact structure, and the footprint of the whole device is greatly reduced compared with traditional open equipment, and it is not affected by the external environment, and has high operational reliability, so it is widely used in 110kV and above urban substations. However, electrical insulation defects caused by partial discharge directly affect the safety of GIS equipment operation and the stability of the system. ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1218
Inventor 王文策高洁郭文勇刘纲薛育荣孙永利杨楠樊伟
Owner STATE GRID CORP OF CHINA
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