Gap distance determination method for lightning arrester with series gap

A technology of gap distance and series gap, applied in the direction of testing dielectric strength, etc., can solve problems such as lack of theoretical guidance

Inactive Publication Date: 2015-12-23
WUHU KAIXIN ARRESTER
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Problems solved by technology

The key to the application of surge arresters with series gaps in overhead power lines is to maintain a suitable gap distance, and the gap distance is affected by external factors, such as altitude, dry humidity and other factors, and should be adjusted accordingly; similarly, i

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Embodiment Construction

[0006] Through the description of the embodiments below, the specific implementation of the present invention includes the shape, structure, mutual position and connection relationship between the various parts, the function and working principle of each part, the manufacturing process and the operation and use method of the various components involved. etc., to make further detailed descriptions to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0007] The design principle of the series gap of the arrester is the determination of the gap distance of the series gap arrester, which needs to meet the following three conditions. Under the impact of lightning, the gap should operate reliably to ensure that the protected insulator string is free from lightning flashover. In order to meet this requirement, the gap distance can be selected to be smaller, so that the a...

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Abstract

The invention relates to a gap distance determination method for a lightning arrester with a series gap. The method comprises the steps of 1, processing the data of multiple flashover tests on an insulator chain in the normal probability distribution manner to obtain a discharge voltage value at any breakdown probability; 2, calculating the 50% discharge voltage ULS50% of the series gap of the lightning arrester according to the formula of ULS50%=(ULG50%+U1mA)*m, wherein ULG50% represents the 50% impulse discharge voltage of the series gap, U1mA represents the 1mA DC type reference voltage of the lightning arrester and m represents a matching coefficient; 3, processing multiple flashover voltage values for different series gaps still in the normal probability distribution manner to obtain discharge voltage values corresponding to the series gaps under the condition of 50% discharge probability, and selecting one series gaps out of the series gaps within the scope of normal distribution with the ULG50% as a reference. According to the technical scheme of the invention, a most appropriate range of series gaps can be obtained based on normal distribution models.

Description

technical field [0001] The invention belongs to the technical field of electric power protection, and relates to a lightning arrester with a series gap, in particular to a method for determining the gap distance of a lightning arrester with a series gap. Background technique [0002] With the increase of power lines, the line tripping accidents caused by lightning strikes are increasing day by day. Line arresters play an important role in line lightning protection. The surge arrester with series gap is composed of the arrester body and the outer gap in series, and the arrester body only bears the action of the working voltage when the gap discharges. Under the working voltage, the voltage borne by the arrester gap and the body is divided according to their respective capacitances. Compared with the body, the capacitive reactance of the body plays a leading role in the gap, and the voltage borne by the body under the operating voltage is very small, and there is no problem ...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 陈波
Owner WUHU KAIXIN ARRESTER
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