Abstract
Since conventional lightning protection measures do not effectively extinguish subsequent arcs of electrical frequency after the passage of lightning, it is impossible to prevent lightning-related accidents on the distribution lines. To solve this problem, a 10 kV multi-chamber arc-quenching arrester (MCAA) applicable to transmission lines of different voltage levels is developed. In order to research the arc-quenching characteristics of the MCAA, COMSOL software was used to simulate and analyze the high-speed airflow coupled arc process. Under the action of a strong airflow at high speed, the arc is segmented, the temperature of the arc falls sharply, and eventually, the arc is extinguished. In the simulation process, the conductivity of the arc and the clouds of change of air speed were achieved. It may be concluded that arc segmentation time and airflow generation time are at a subtle level. Meanwhile, an experimental circuit was established to conduct the arc-quenching experiment. A high-speed camera was used to observe the experimental process and the oscilloscope was used to record the arc-quenching waveform. The experimental results show that the MCAA had a good arc-extinguishing effect and that the arc was extinguished within 0.35 ms. The current amplitude of the frequency arc was 1.2 kA.
Highlights
In the current power system, the number of trips caused by lightning strikes on transmission lines accounts for 40% to 70% of the total number of trips [1,2,3,4]
12 countries, including the United States and the former Soviet Union, for three consecutive years showed that the number of lightning strikes accounted for 60% of the total number of trips in transmission lines with voltage levels of 275 kV to 500 kV and a total length of
The actual operation data show that the current traditional “Blocking type” lightning protection measures against lightning are not ideal. This is due to the line’s lightning resistance level, ground network resistance, lightning steepness, insulation level, and lightning strike mode factors, lightning intensity exceeds the probability of lightning resistance level, which are uncontrollable factors, resulting in a high probability of insulation impact flashover, and no measures to inhibit the electric frequency arc, resulting in increases in the lightning accident rate, lightning trip rate, and lightning disconnection rate
Summary
In the current power system, the number of trips caused by lightning strikes on transmission lines accounts for 40% to 70% of the total number of trips [1,2,3,4]. The actual operation data show that the current traditional “Blocking type” lightning protection measures against lightning are not ideal. This is due to the line’s lightning resistance level, ground network resistance, lightning steepness, insulation level, and lightning strike mode factors, lightning intensity exceeds the probability of lightning resistance level, which are uncontrollable factors, resulting in a high probability of insulation impact flashover, and no measures to inhibit the electric frequency arc, resulting in increases in the lightning accident rate, lightning trip rate, and lightning disconnection rate. The application effect of MCAA is analyzed, verifying the validity and reliability of MCAA
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