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Improved impulse corona model

A model, corona technology, applied in the field of electric power industry, can solve problems such as tripping of transmission lines and flashover of insulators

Inactive Publication Date: 2012-06-27
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If lightning protection measures are not taken properly, accidents such as insulator flashover and transmission line tripping may occur

Method used

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Experimental program
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Effect test

Embodiment Construction

[0021] Voltcourt characteristics of shock corona and traditional corona model:

[0022] The voltcourt characteristic of shock corona is the basis for research and calculation of wave attenuation and deformation. The so-called voltcourt characteristic is the relationship between the instantaneous value u of the impulse voltage of the wire and the total charge q on the wire and in the corona sleeve around it during the wave propagation process: q=f(u).

[0023] Typical shock corona voltage library characteristic curve (q-u curve) such as figure 1 shown. The OA segment in the figure corresponds to the voltage u less than the corona initial voltage u 0 When the wave head part, the voltcourt characteristic is a straight line, and its slope is equal to the geometric capacitance C of the wire 0 , namely C 0 =q / u 0 . Section AB corresponds to the strong development stage of corona. At this time, the capacitance of the wire changes, and its dynamic capacitance C d =dq / du>C 0 ....

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Abstract

The invention relates to an improved impulse corona model comprising geometric capacitors, a dynamic capacitor, a diode D and a voltage source. A power transmission line capable of generating impulse corona comprises a guide line and a corona sleeve. In the invention, the concept of the corona radius is utilized, the region from the power transmission line to the ground struck by lighting is divided into a corona onset region and a non corona onset region, the dynamic capacitance caused by the impulse corona is limited in the corona sleeve, so that the improved impulse corona model more conforms to the practical condition of the corona development, and the simulation result of the improved impulse corona is closer to the measured value compared with that of a traditional impulse corona model.

Description

Technical field: [0001] The invention mainly relates to an impact corona model, in particular to an improved impact corona model, which belongs to the technical field of electric power industry. Background technique: [0002] Transmission lines are the arteries of the power system, connecting the entire grid. With the continuous development of my country's electric power industry, the working voltage of the wire is getting higher and higher, and the probability of being struck by lightning is also increasing. If lightning protection measures are not adopted properly, accidents such as flashover of insulators and tripping of transmission lines may be caused. According to statistics: the tripping accidents of transmission lines caused by lightning strikes in my country account for 40% to 70% of the total tripping accidents, especially in mountainous areas with heavy thunder, high soil rate and complex terrain, the tripping rate caused by lightning strikes on transmission line...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 卢芸隋东硼
Owner SHENYANG POLYTECHNIC UNIV
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