Non-contact measurement method for surface discharge pulse peak of high-voltage insulator

Abstract

The invention relates to a non-contact measurement method for the surface discharge pulse peak of a high-voltage insulator. The non-contact measurement method comprises the steps of firstly processing an ultraviolet image, which is shot by an ultraviolet imaging instrument, of an insulator string, extracting the maximum horizontal light spot diameter D of the ultraviolet image, then modifying the maximum horizontal light spot diameter D to a light spot diameter Dd0 at a certain unified shooting distance d0 through normalization processing, and finally substituting the light spot diameter Dd0 into a discharge regression equation I=K.Dd0+L so as to acquire the discharge pulse peak I, wherein K and L are constants. According to the invention, the normalized maximum horizontal light spot diameter is taken as a characteristic value so as to carry out quantitative analysis on the surface discharge pulse peak of the high-voltage insulator. The method is not only applicable to a single insulator, but also applicable to an insulator string. The method eliminates influences imposed on a measurement result by the shooting distance, can provide reliable information for security state assessment of the insulator and flashover early warning, and ensures an electric power system to operate safely and stably.

Description

technical field [0001] The invention relates to a non-contact measurement method for insulator surface discharge pulse peak value based on ultraviolet images, belonging to the high voltage technical field. Background technique [0002] The surface discharge of the insulator can accelerate the aging and deterioration of the insulating medium. At the same time, the discharge is also an important symptom signal that characterizes the operating state of the insulator. By detecting and analyzing the discharge intensity, the degree of damage to the insulator can be evaluated, so as to ensure the safety of the insulator. Assessment and flashover warning. At present, the pulse current method is mostly used in engineering to measure the surface discharge of insulators, but this method is a contact detection method. During on-site detection, it is necessary to install sensors, data acquisition and data transmission systems, etc. on the insulator strings to be detected, and each set of...

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Problems solved by technology

However, the use of ultraviolet imaging to measure discharge intensity has the following difficulties: first, it is necessary to study which parameters are used to quantitatively analyze the detection results of ultraviolet imaging; secondly, there are often multiple discharge points on the insulator, and these discharge points often interfere with each other and overlap, which brings great difficulties to the quantitative analysis of the discharge; in addition, whether the string length of the insulator has an impact on the discharge relationship has not yet been related research and reports; thirdly, in the field detection, the observation distance of the ultraviolet imager is not fixed, and the distance has a very obvious impact on the detected ultraviolet image, so it is necessary to study the variation characteristics of the ultraviolet image with distance

[0004] At present, there are some literatures that study the relationship between the corona discharge on the surface of the insulator and the area of ​​the ultraviolet spot, but the related research takes the single-piece insulator as the research object and only involves one discharge point. In engineering practice, more insulator strings are used. , is composed of multiple insulators, so there are multiple discharge points, and there are often overlaps between the discharge points. The traditional spot area method and photon number method are helpless for this kind of problem

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