Online detection method of cracks of air channel insulation encapsulated layer of dry-type hollow shunt reactor

Abstract

The present invention provides an online detection method of cracks of an air channel insulation encapsulated layer of a dry-type hollow shunt reactor. The method mainly comprises the following stepsof: S01: reading endoscope detection image video of a detected dry-type hollow shunt reactor, and decomposing the endoscope detection image video into frames; S02: employing a local multi-scale dark channel endoscope image enhancement algorithm to perform enhancement and denoising operations of the images decomposed into the frames; S03: performing filtering processing of each image by employing wavelet multi scales taking the consideration of the dark channel priori criteria and same translucent color ratio assumption balance, and performing graying processing of each image; S04: employing alocal binary pattern operator according to local properties of endoscope image fracture distribution and gray contract to achieve dry-type hollow shunt reactor air channel insulation encapsulated layer crack edge detection and identification; and S05: determining crack positions of the dry-type hollow shunt reactor air channel insulation encapsulated layer. The method provided by the invention canaccurately achieve positioning of the cracks of the air channel insulation encapsulated layer.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to an online detection method for cracks in an air duct insulation envelope layer of a dry-type air-core shunt reactor. Background technique [0002] With the development of society and the growth of the national economy, the country's electricity demand has also greatly increased, and the power system is also developing in the direction of high voltage, large capacity and long-distance transmission. However, many problems have appeared in the development of the power system, such as the increase of reactive power in the line, the increase of terminal voltage, and the overvoltage of power frequency. In order to solve these problems, in the power system, a reactor, that is, a shunt reactor, is usually connected to the primary line or secondary line of the busbar and transmission line. It can supplement the inductive reactance of the system, balance the reactive power of the system, limit ...

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Problems solved by technology

[0003] In recent years, dry-type air-core shunt reactor burning accidents have occurred frequently. Through the disintegration of the faulty dry-type air-core shunt reactor, it was found that there are many fine cracks on the surface of the air duct insulation envelope of the burned reactor. These cracks are easy to cause Inter-turn short circuit caused by water ingress and damp causes reactor failure

[0004] At present, the detection method for cracks on the surface of the insulation envelope layer of the 35kV reactor air duct is mainly to manually lift the endoscope into the reactor air duct, adjust the angle of the endoscope probe, and manually inspect the air duct insulation envelope through video images. Whether there are cracks on the surface of the layer, but each reactor has about 1,600 air ducts, which can be identified only by manual experience, and the phenomenon of misdiagnosis and missed diagnosis is serious

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