Lightning stroke co-jump tolerance performance test method and system for 110kV power transmission line

Abstract

The invention provides a lightning stroke co-jump tolerance performance test method and system for a 110kV power transmission line. The method comprises the steps of firstly simulating a lightning stroke power transmission line tower top, and carrying out the lightning stroke co-jump tolerance current threshold value test; secondly, changing the number of coupling ground wires to obtain m groups of actually measured lightning stroke co-jump tolerance current thresholds; calculating a theoretical value of the same-tower double-circuit power transmission line lightning stroke co-jump tolerance current threshold; optimizing a theoretical calculation formula of the same-tower double-circuit power transmission line lightning stroke co-jump tolerance current threshold; and finally, calculating a comprehensive evaluation factor of the lightning stroke co-jump tolerance characteristic of the double-circuit transmission line on the same tower. The invention develops a lightning stroke co-jump tolerance performance test platform for the 110kV power transmission line considering the number of the coupling ground wires, and provides the lightning stroke co-jump tolerance performance evaluation method for the 110kV power transmission line considering the number of the coupling ground wires, so that the lightning stroke co-jump tolerance performance of the double-circuit power transmission line on the same tower can be tested and evaluated.

Description

technical field [0001] The present invention relates to the technical field of lightning protection for transmission lines, and more specifically, to a method and system for testing the lightning strike and jump tolerance performance of a 110kV transmission line. Background technique [0002] As a natural discharge phenomenon, lightning is also the core factor that causes the tripping of 110kV transmission lines, which seriously threatens the power supply reliability of the power system. In recent years, in order to reduce the cost of line construction and save land resources, multi-circuit transmission lines on the same tower have been widely used, and preventing lightning strikes and simultaneous jumps on multi-circuit transmission lines on the same tower has also become a research hotspot. In addition, as a commonly used lightning protection measure, the number of coupled ground wires is optional, too many or too few will affect the lightning protection effect. Therefore...

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Problems solved by technology

[0003] Existing research on lightning protection of transmission line systems mainly relies on simulation and single-circuit transmission line systems, but lacks technical protection against lightning strikes and jump faults in the 110kV transmission line simulation test system, and does not consider the number of coupling ground wires on the same tower For the research on the faults of lightning strikes and trips of multiple transmission lines, an evaluation method for lightning strikes and trips of 110kV transmission lines considering the number of coupling ground wires is proposed, and a test platform is built to evaluate the lightning strikes and trips of typical 110kV multi-circuit transmission lines on the same tower. It provides a solid foundation for the performance and lightning protection design of the multi-circuit transmission line system, and also provides an important guarantee for improving the safe operation and stability of the transmission line in the future

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