Method for correcting corona discharge voltage of alternating-current line hardware

An AC line and corona discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problems of large correction deviation, the correction result cannot meet the electrical test requirements of AC line fittings, and it is not suitable, and achieves the effect of small correction deviation.

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] At present, there are many methods for correcting the corona discharge voltage of AC line fittings, but each method has a large deviation from the actual test results, and the correction results cannot meet the electrical test requirements of AC line fittings. Therefore, the existing national and international standards recommend methods Not suitable as a general altitude correction method for line fittings

Method used

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  • Method for correcting corona discharge voltage of alternating-current line hardware
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  • Method for correcting corona discharge voltage of alternating-current line hardware

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Embodiment

[0035] Through the visible corona test of fittings in the environment and climate laboratory of the UHV AC test base, 5 different types of AC transmission projects were selected, including tension shielding rings, bell type anti-vibration hammers, tuning fork type anti-vibration hammers, spacers and suspension clamps Typical line fittings are used as the tested product, and the corona discharge voltage test results of each test product are shown in Figure 1-Figure 4 shown. in: figure 1 It is a schematic diagram of the test results of shielding ring corona discharge voltage at different simulated altitudes provided by the present invention; figure 2 It is a schematic diagram of the test results of anti-vibration hammer corona discharge voltage at different simulated altitudes provided by the present invention; image 3 It is a schematic diagram of the corona discharge voltage test results of spacer rods under different simulated altitudes provided by the present invention; ...

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Abstract

The invention relates to a method for correcting a corona discharge voltage of alternating-current line hardware. The method comprises the following steps that (1) a characteristic curve of the relation between the corona discharge voltage of the alternating-current line hardware and simulated altitudes is determined; (2) altitude correction factors Ka under the different simulated altitudes are determined; (3) the simulated corona discharge voltage UH(i) of the alternating-current line hardware under the simulated altitudes and a flat area discharge voltage Uo(i) are associated through the altitude correction factors Ka, a mathematical model is built, and the values, meeting Uo(i)=KaUH(i), of the altitude correction factors Ka are found out; (4) the altitude correction factors Ka are set to be equal to f(alpha, beta, ...zeta); (5) the values of alpha, beta, ...zeta are determined; (6) the corona discharge voltage of the alternating-current line hardware of different structural types is corrected under the altitudes. According to the method, the line hardware size and design basis meeting the actual running requirement can be provided, meanwhile, basic data and reference are provided for the optimization and improvement work of the alternating-current line hardware, the method is small in correction deviation to the actual testing result, and the correction result meets the electrical test requirement of the alternating-current line hardware.

Description

technical field [0001] The invention relates to a method for correcting an AC power transmission project, in particular to a method for correcting corona discharge voltage of an AC line fitting. Background technique [0002] There are many factors that affect the corona discharge voltage of AC line fittings in high-voltage power transmission projects, such as the shape of the electrode, its surface smoothness, and the degree of pollution. The above are internal factors. Before carrying out the corona test of AC line fittings, these The impact is minimized. In addition, the corona discharge will be affected by the surrounding atmospheric conditions, such as air density, temperature, humidity, wind and other external factors, in which the air density has a relatively large impact, the higher the altitude, the lower the air density, and the lower the average free path of electrons in the air. Longer, the smaller the corona inception voltage or inception potential gradient, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 曹晶张勤全姗姗梁进祥代静汪英英谷莉莉许中
Owner STATE GRID CORP OF CHINA
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