Flashover voltage prediction method for high speed train roof insulator

Abstract

The invention relates to a flashover voltage prediction method for a high speed train roof insulator. The flashover voltage prediction method for the high speed train roof insulator comprises measuring a flashover resistivity rho of the high speed train roof insulator; fitting a shape function g(x) and a pollution distribution function f(x) according to the structure and the actual pollution distribution of the insulator, wherein x is arc length; calculating a critical flashover arc length xc of the insulator according to the flashover resistivity rho, the shape function g(x) and the pollution distribution function f(x) of the insulator and further calculating a critical flashover voltage Uc. According to the flashover voltage prediction method for the high speed train roof insulator, flashover voltages of roof insulators of any shape can be calculated, and meanwhile, influences of nonuniformity of pollution distribution on the flashover voltages of the roof insulators are fully taken advantages of; compared with the prior art, the flashover voltage prediction method for the high speed train roof insulator is more approximate to actual working conditions on site and is more accurate in prediction results.

Description

technical field [0001] The invention relates to a method for predicting pollution flashover voltage of roof insulators of high-speed trains, belonging to the technical field of railway system measurement. Background technique [0002] Train roof insulators, including conductive rod support insulators and pantograph support insulators, are one of the main insulation equipment for trains, and their reliability is directly related to the safe and stable operation of electrified railways. With the rapid development of high-speed railways in my country, the operating mileage and crossing area of ​​high-speed railways have gradually increased, and the operating environment along the lines has become more complex, and the requirements for EMU roof insulators have become more stringent. In recent years, flashover faults of EMU roof insulators have become increasingly frequent, and have become an important factor affecting the safe and stable operation of high-speed railways in my co...

AI Technical Summary

Problems solved by technology

However, in actual working conditions, the pollution is not uniformly distributed along the surface of the insulator shed, and the diameter of the insulator shed is different and the shape is complex

[0004] The traditional insulator pollution flashover voltage prediction method has the following defects: (1) The traditional measurement method is only applicable to the case where the pollution is uniformly distributed along the surface of the insulator; (2) The traditional measurement method simplifies the shape factor of the insulator that affects the critical flashover voltage to a constant, the calculation results are only applicable to a single insulator with regular shape

The results of the traditional method to predict the pollution flashover voltage of insulators deviate greatly from the actual results

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