10kV overhead line lightning protection method using coupling ground wire and lightning arrester cooperatively

Abstract

The invention discloses a 10kV overhead line lightning protection method using a coupling ground wire and a lightning arrester cooperatively. The method comprises the steps of firstly considering the impact on the bearing of a line tower and other mechanical aspects after the coupling ground wire is additionally installed, calculating the applicability, and obtaining the installation number of the coupling ground wires, secondly, under various extreme conditions (icing and windage yaw), ensuring that no discharge occurs between the coupling ground wire and the wire at the center of the span, so as to determine the installation position of the coupling ground wire, and further provide the method for testing the lightning resistance level of the 10kV overhead line containing the coupling ground wire. Aiming at the problem that the lightning resistance level is reduced after a coupling ground wire is erected in a segmented manner, the invention provides a lightning protection method matched with a lightning arrester for use at the segment of the coupling ground wire, and a 10kV overhead line lightning overvoltage simulation calculation model is established by utilizing simulation software, with the condition that a distribution line is not subjected to two-phase short circuit, the lightning protection effect of the segmented part of the coupling ground wire matched with the MOA is tested. On the basis of the existing lightning protection design, the lightning resistance level of the 10kV distribution line is further improved, and the operation reliability of the distribution network is improved.

Description

technical field [0001] The invention relates to the field of lightning protection for overhead lines of 10kV distribution network, in particular to a lightning protection method for 10kV overhead lines used in conjunction with coupled ground wires and lightning arresters (MOA). Background technique [0002] The 10kV distribution line is an important connection 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 a typical design. Due to their large insulation margin and relatively low tower height, most overhead lines do not need to take lightning protection measures, and only in distribution transformers, load switches and other distribution equipment Take measures such as installing MOA and reducing grounding resistance. This measure can meet the lightning protection needs in most areas, but in some areas with strong lightning activities, the lightnin...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a lightning protection method for 10kV overhead lines in which coupled ground wires and MOA are used in conjunction to solve the application method of coupled ground wires in 10kV overhead lines, and proposes the method of installing MOA at the section of coupled ground wires The method is used to solve the problem that the lightning resistance level of the line is reduced due to the coupling ground wire segment

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