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
CN110535089AInactive Publication Date: 2019-12-03YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Publication Date
2019-12-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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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