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Method for selecting erection height of lightning conductor of 10kV overhead distribution line

A technology for erecting high and overhead lines, applied in the installation of electrical components, cables, installation of lighting conductors, etc., which can solve the problems of small tower size and complex line distribution.

Active Publication Date: 2013-01-16
广州中光电气科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

110kV and above transmission lines are erected with lightning protection lines along the whole line, and distribution network is relatively rare in 10kV distribution network due to the shortcomings of complex line distribution and small tower size.

Method used

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  • Method for selecting erection height of lightning conductor of 10kV overhead distribution line
  • Method for selecting erection height of lightning conductor of 10kV overhead distribution line
  • Method for selecting erection height of lightning conductor of 10kV overhead distribution line

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Embodiment

[0060] A method for selecting the erection height of lightning protection wires for 10kV power distribution overhead lines, comprising the following steps:

[0061] (1) Construct a mathematical model for calculating the height of the lightning protection line:

[0062] (i) The distance S between the center conductor of the span and the lightning conductor and the length l of the span satisfy the following relationship:

[0063] S≥1+0.012l (1)

[0064] (ii) if figure 1 As shown, the relationship between the distance S between the center conductor of the span and the lightning conductor and the height of the lightning conductor satisfies the following formula:

[0065] S=H+f D -f B (2)

[0066] in, f D = g D l 2 8 σ D ...

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Abstract

The invention discloses a method for selecting the erection height of a lightning conductor of a 10kV overhead distribution line. The method comprises the following steps: (1) building and obtaining a mathematical model of the height of the lightning conductor; (2) obtaining a maximum of a lightning conductor height function; (3) calculating a phase conductor stress and a lightning conductor stress under a current meteorological condition; (4) calculating height maximum Hm of the lightning conductor under a different-span length 1; (5) calculating the coupling performance of the lightning conductor and the phase conductor at different heights of the lightning conductor; and (6) selecting the suitable height of the lightning conductor. According to the invention, the erection height of the lightning conductor can be analyzed and selected in the terms of mechanical stress and electrical coupling performance in a scientific and reasonable manner. The method provided by the invention is simple and feasible, and has good engineering use significance.

Description

technical field [0001] The invention relates to the field of distribution network line design, in particular to a method for selecting the erection height of a lightning protection wire of a 10kV power distribution overhead line. Background technique [0002] The distribution network is a network that directly distributes electric energy to a large number of power users, so the security and reliability of power supply of the distribution network are getting more and more attention. The 10kV overhead distribution line is an important part of the distribution network. Its own insulation level is low, the distribution is complicated, and the trip failure rate remains high. Among the causes of distribution line tripping accidents, accidents caused by lightning strikes account for 70%-80% of the total accidents. Lightning protection of distribution lines is an important part of the current grid power supply stability work. [0003] At present, the protection measures for distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G13/00
Inventor 刘刚陈荣锋林杰
Owner 广州中光电气科技有限公司