Lightning stroke co-jump evaluation method and platform considering height of coupling ground wire

Abstract

The invention provides a lightning stroke co-jump evaluation method and platform considering the height of a coupling ground wire. The method comprises the steps: firstly simulating the lightning stroke of a tower top of a power transmission line tower, carrying out lightning stroke co-jump current threshold value test, the method comprises the following steps: firstly, calculating a lightning stroke same-jump withstand current characteristic factor of the power transmission line, calculating a characteristic influence factor considering a coupling ground wire height factor and a coupling ground wire comprehensive characteristic factor, finally obtaining a lightning stroke same-jump withstand performance evaluation factor of the double-circuit power transmission line on the same tower, and carrying out lightning stroke same-jump withstand performance evaluation on the double-circuit power transmission line on the same tower. According to the invention, the power transmission line lightning stroke co-jump test platform considering the coupling ground wire height factor is developed, the power transmission line lightning stroke co-jump evaluation method considering the coupling ground wire height factor is provided, and the lightning stroke co-jump tolerance performance of the same-tower double-circuit power transmission line can be tested and evaluated.

Description

technical field [0001] The present invention relates to the technical field of lightning protection for power transmission lines, and more specifically, to a method and platform for lightning simultaneous jump evaluation taking into account the height of coupling ground wires. Background technique [0002] Under the background of the general trend of global energy Internet, the safe and stable operation of the power system has become the core goal pursued by power grid companies. Although lightning is a natural discharge phenomenon, it seriously affects the power supply reliability of the power system. It not only frequently causes single-circuit transmission lines to trip, but also sometimes causes lightning strikes and trips on multiple transmission lines on the same tower, which is very harmful. In addition, as a commonly used lightning protection measure, the coupling ground wire has a certain degree of selectivity in its erection height. If it is too high or too low, it...

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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 a simulation test system for the lightning resistance performance of transmission line systems and technical prevention of lightning strike and jump faults, and does not take into account coupling ground wires Under the influence of height, the research on lightning strike and tripping faults of multi-circuit transmission lines on the same tower is proposed. Therefore, an evaluation method for lightning strikes and tripping of transmission lines considering the height factor of coupling ground wires is proposed, and a test platform is built to evaluate multi-circuit transmission lines on the same tower. It provides a solid foundation for the lightning strike and jump tolerance characteristics and the 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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