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Lightning protection method of 10kv overhead line used with coupled ground wire and arrester

An overhead line and coupling ground technology, which is applied in the lightning protection field of 10kV overhead lines, can solve the problem of reducing the lightning resistance level of the line, and achieve the effect of reducing overvoltage and solving the reduction of lightning resistance level.

Active Publication Date: 2022-07-29
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0007] The invention provides a lightning protection method for a 10kV overhead line that is used in conjunction with a coupling ground wire and a lightning arrester, to solve the application method of the coupling ground wire in a 10kV overhead line, and proposes to install MOA at the section of the coupling ground wire The method is used to solve the problem of the reduction of the line lightning resistance level caused by the coupled ground wire segment

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  • Lightning protection method of 10kv overhead line used with coupled ground wire and arrester
  • Lightning protection method of 10kv overhead line used with coupled ground wire and arrester
  • Lightning protection method of 10kv overhead line used with coupled ground wire and arrester

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Embodiment Construction

[0054] Embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0055] 1. The lightning protection method of the 10kV overhead line used in conjunction with the coupling ground wire and the arrester includes the following steps:

[0056] 1.1 Calculate the applicability of the installation of the coupled ground wire according to the mechanical influence on the load-bearing of the line tower after the installation of the coupled ground wire, and obtain the installation quantity of the coupled ground wire.

[0057] According to formula (1) and formula (2), the vertical load value and vertical load design value of single- and double-circuit bare conductors and insulated conductors with different numbers of coupled ground wires can be obtained. The calculation results are shown in Table 1.

[0058] Table 1 Vertical loads ...

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Abstract

The invention discloses a lightning protection method for a 10kV overhead line which is used in conjunction with a coupled ground wire and a lightning arrester. The method includes the following steps: firstly considering the impact on mechanics such as the load bearing of a line tower after adding a coupled ground wire, calculating its applicability, and obtaining Installed number of coupled ground wires. Secondly, under various extreme conditions (icing and wind deflection), it should be ensured that no discharge occurs between the coupled ground wire and the conductor at the center of the span, so as to determine the installation position of the coupled ground wire, and then propose a 10kV overhead with a coupled ground wire. Test method for lightning resistance level of lines. Aiming at the problem that the lightning resistance level is reduced after the coupled ground wire is erected in sections, a lightning protection method is proposed to use the coupling ground wire section and the arrester. On the condition that no two-phase short circuit occurs in the electrical line, the lightning protection effect of the MOA used in conjunction with the coupling ground wire segment is tested. The invention can further improve the lightning resistance level of the 10kV distribution line on the basis of the existing lightning protection design, and improve the operation reliability of the distribution network.

Description

technical field [0001] The invention relates to the field of lightning protection of overhead lines of 10kV distribution network, in particular to a lightning protection method of 10kV overhead lines used in conjunction with a coupled ground wire and a lightning arrester (MOA). Background technique [0002] The 10kV distribution line is an important connection part between the transmission line and the user end, and the safe and stable operation of the distribution line is very important. At present, most of the 10kV overhead lines adopt typical designs. Due to their large insulation margin and relatively low tower height, most overhead lines do not need lightning protection measures. Take measures such as installing MOA and reducing grounding resistance. This measure can meet the lightning protection needs of most areas, but in some areas with strong lightning activities, the lightning resistance level still cannot meet the requirements. [0003] In mountainous areas, min...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G7/22
CPCH02G7/22
Inventor 杨鑫王延夫蒋凌峰雷佳成姚铮祝欢欢
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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