Transmission line suspension insulator string external insulation state assessment method

A suspension insulator and state assessment technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high requirements and harshness of measuring equipment

Active Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the harshness of traditional surface conductivity measurement methods and high requi

Method used

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  • Transmission line suspension insulator string external insulation state assessment method
  • Transmission line suspension insulator string external insulation state assessment method
  • Transmission line suspension insulator string external insulation state assessment method

Examples

Experimental program
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Embodiment 1

[0023] Such as image 3 As shown, a 500kV line insulator string consists of 28 pieces of XWP2-160 type insulators. Starting from the high-voltage end, the surface conductivity of the 2nd, 3rd, 14th, 15th, 27th, and 28th insulators was measured, and the test results were 2.57 and 2.49 respectively. , 2.13, 2.18, 2.45, 2.57μS.

[0024] Use the interpolation method to obtain the distribution curve of the surface conductivity of the insulator along the string, and obtain the surface conductivity of 28 insulators. The distribution curve is as follows image 3 shown.

[0025] XWP2-160 type insulator shape factor f u-i Both are 1.104.

[0026] According to the overall conductivity σ of the insulator string str for:

[0027] σ s t r = Σf u - i Σ ...

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Abstract

The invention discloses a transmission line suspension insulator string external insulation state assessment method. By measuring the conductivity of the surface of a monolithic insulator, the external insulation state of a suspension insulator string of a transmission line in actual operation is assessed. According to the detection method provided by the invention, the needs of pollution level data collection and law observation of the transmission line suspension insulator are met, and the flashover voltage is predicted.

Description

technical field [0001] The invention relates to a method for evaluating the external insulation state of a suspension type insulator of a transmission line, and belongs to the technical field of power grid information security detection and defense. Background technique [0002] Insulator pollution flashover accidents seriously affect the safe and stable operation of the power grid. At present, the problem of air pollution in my country is still very prominent, and the external insulation of transmission lines is still facing severe challenges. Reasonable pollution state evaluation parameters are an important basis for scientifically evaluating the external insulation state of transmission lines. There is a clear relationship between equivalent salt density and flashover voltage under artificial pollution test conditions, but the relationship between equivalent salt density and flashover voltage of insulators under natural pollution conditions is not obvious, and a large nu...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 高嵩赵晨龙周志成朱明曦陶风波王黎明陈杰张龙
Owner STATE GRID CORP OF CHINA
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