Abstract
To reduce the damage from the power frequency follow current of distribution lines, a multi-fracture compression airflow arc-extinguishing structure is studied. The structure is mainly composed of a compression tube, a metal electrode, and metal connection fittings, and the multi-fracture compression airflow arc-extinguishing body is formed by the combination of packaging and insulation fittings. The body and the air gap are parallel to both ends of the insulator. When lightning strikes, the internal short gap of the main body and the air gap break down, and the lightning arc enters the arc-extinguishing body through the breakdown channel. In the structure, the arc is compressed by force to form internal and external gradients of temperature and to produce jet airflow. The jet airflow acts on the subsequent power frequency follow current arc, which is suppressed and extinguished. In this paper, a model coupling an arc and a compressed jet airflow in a multi-fracture compression airflow arc-extinguishing structure is established theoretically and simulated by simulation software. Finally, a power frequency follow current interruption test is carried out. The simulation results show that a high-speed airflow of 600 m/s is formed around the fracture at approximately 0.99 ms, and the airflow is proportional to the rate of temperature variation. The test results show that the power frequency follow current of 1.289 kA is cut off within approximately 3 ms without a reburning phenomenon. The effect of power frequency follow current interruption is obvious in the structure.
Highlights
Distribution lines have become links between power networks and users, and the safe and stable operation of these lines directly affects the power supply reliability of the power grid.1 Due to the low insulation level of distribution lines, the probability of influences from direct lightning and induced lightning is high, which makes lightning flashover occur
The jet airflow acts on the subsequent power frequency follow current arc, which is suppressed and extinguished
At present, installing a metal oxide arrester (MOA) to limit the potential difference between the ends of an insulator is a main lightning protection measure used for distribution lines
Summary
Distribution lines have become links between power networks and users, and the safe and stable operation of these lines directly affects the power supply reliability of the power grid. Due to the low insulation level of distribution lines, the probability of influences from direct lightning and induced lightning is high, which makes lightning flashover occur. Advanced lightning protection for distribution lines provided by long flashover arresters (LFAs) and multichamber insulator arresters (MCIAs) has been introduced in Refs. The effect of a multi-fracture compression airflow arc-extinguishing structure on interrupting the power frequency follow current is studied. A circuit is built for power frequency follow current experiments to verify the model characteristics. The trial circuit of the power frequency follow current is built to carry out the test and its test effect is analyzed. These experiments provide a theoretical and experimental reference for the study of multi-fracture compression airflow arc-extinguishing lightning protection products in the future
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