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Laying method and device for indirect grounding of lightning conductor of power distribution network

A technology for lightning protection wires and distribution networks, which is applied in the field of laying methods and devices for indirect grounding of lightning protection wires in distribution networks, can solve problems such as safety risks and power loss, and achieve the goals of protecting equipment, avoiding power consumption, and reducing safety risks Effect

Inactive Publication Date: 2019-12-03
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] This application provides a laying method and device for indirect grounding of lightning protection wires in distribution networks, so as to solve the existing problems of power loss and safety risks caused by direct grounding of lightning protection wires at present

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  • Laying method and device for indirect grounding of lightning conductor of power distribution network
  • Laying method and device for indirect grounding of lightning conductor of power distribution network

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Embodiment Construction

[0044] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0045] At present, the lightning conductor and the grounding pole in the distribution network are directly grounded, and the coupling current is generated between the three-phase conductor and the lightning conductor due to electromagnetic induction, and a circulating current is formed through the direct grounding of the lightning conductor, w...

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Abstract

The invention provides a laying method and device for indirect grounding of a lightning conductor of a power distribution network. The method is characterized in that lightning impulse breakdown voltages and power frequency breakdown voltages under different air gap distances are obtained; according to the lightning impulse breakdown voltages, a 99.9% probability relation function of the lightningimpulse breakdown voltage and the gap distance is obtained; a 0.1% probability relation function of the power frequency breakdown voltage and the gap distance is obtained according to the power frequency breakdown voltages; an air gap d and an air gap s are respectively obtained according to a lightning impulse voltage conduction threshold value and a single-phase grounding short circuit power frequency voltage; an air gap distance range (s, d) is obtained according to the air gap s and the air gap d; the air gap with the distance range of (s, d) is connected with a composite insulator in parallel to obtain a parallel structure; the parallel structure is laid between a grounding electrode and the lightning conductor; the parallel structure is installed between the lightning conductor andthe grounding electrode by utilizing the voltage withstanding characteristic of the composite insulator and the discharge characteristic of the air gap, and indirect grounding between the lightning conductor and the grounding electrode is realized.

Description

technical field [0001] The present application relates to the technical field of distribution network overhead lines, in particular to a laying method and device for indirect grounding of distribution network lightning conductors. Background technique [0002] The power distribution overhead line is an important part of the power network, and its function is to transmit and distribute electric energy; the power distribution overhead line is erected by using poles to hang the wires in the air, and directly supplies power to users; the power distribution overhead line has the advantages of simple erection, low cost, and convenient maintenance. Etc. [0003] Lightning strikes can easily lead to flashover of insulators and broken wires of distribution lines, seriously affecting the safe and stable operation of distribution circuits. Therefore, lightning protection technology for distribution networks has gradually received attention. A single lightning conductor, base by base i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G13/00
CPCH02G13/00H02G13/20H02G13/40H02G13/60
Inventor 张自勤秦忠项恩新范黎涛刘俊峰张教伟朱茂泽李勒对段生江
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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