Method for predicting flashover voltage by using surface conductivity and leakage current

A technology of surface conductivity and flashover voltage, applied in the direction of testing dielectric strength, electrical digital data processing, special data processing applications, etc.

Active Publication Date: 2013-05-01
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Abstract
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  • Method for predicting flashover voltage by using surface conductivity and leakage current
  • Method for predicting flashover voltage by using surface conductivity and leakage current
  • Method for predicting flashover voltage by using surface conductivity and leakage current

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0054] Such as figure 1 As shown, at the beginning of the calculation, the shape factor of the insulator is set.

[0055] Input the surface conductivity σ of the insulator measured by the test, and give the initial value of each parameter.

[0056] Assume that at time zero, the voltage u(t) reaches its peak and arcing begins:

[0057] u(t)=U m cos ωt (1)

[0058] Among them, U m is the effective value of the voltage, ω is the angular frequency, and t is the time.

[0059] Resistance R of the remaining dirt layer of the flat suspension insulator p With arc root radius r 0 and arc length L arc The formula for the change:

[0060] R p ...

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Abstract

The invention discloses a method for predicting a flashover voltage by using a surface conductivity and a leakage current. A surface conductivity of an insulator is measured; by using the surface conductivity of the insulator as an input parameter and combining a form factor parameter of the insulator, a dynamic arc model is established, a leakage current development trend is calculated to obtain a minimum flashover voltage of an insulator string, and the insulation margin and the external insulation level of the insulator are judged on the basis of the minimum flashover voltage. According to the invention, the whole conductivity of the insulator string is measured actually, the leakage current development trend is calculated by using the dynamic arc model, the change rule of the leakage current and the arc length with the time is described by using the arc dynamic model through a mathematical equation and more accords with the actual condition, and the purpose of insulation state judging and pollution flashover pre-warning is realized.

Description

technical field [0001] The invention belongs to the field of evaluation of the external insulation state of the transmission line. The conductivity of the dirty layer on the surface of the insulator is used as an input parameter to simulate the development trend of the leakage current, predict the flashover voltage of the insulator, and then evaluate the external insulation level of the transmission line. It is suitable for power transmission Porcelain insulators and glass insulators are widely used in lines. Background technique [0002] Pollution flashover is one of the important reasons that may lead to catastrophic accidents in power systems. In order to ensure the safe operation of the power grid, it is necessary to give an early warning before the pollution flashover accident occurs. Flashover voltage is an important parameter to characterize the external insulation performance of insulators. Measuring and estimating the flashover voltage of insulator strings is an ef...

Claims

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Application Information

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IPC IPC(8): G01R31/12G06F19/00
Inventor 周志成赵晨龙高嵩张军广王黎明刘洋陶风波马勇路永玲陈杰
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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