基于電氣場耦合的雷電誘導固相爆炸氣流滅弧機理研究
[Abstract]:Lightning damage is the first killer of power grid. Large-scale power outage seriously endangers all fields of national economy and all aspects of people's life. Lightning protection is a world-class problem. With the increasing scale of power grid and the rising of voltage level in recent years, the lightning activity is becoming more and more intense because of the abnormal climate change. Under the complicated climate and geographical conditions, the probability of lightning strike will be higher. The power loss, equipment damage and maintenance work caused by lightning strike cause great direct and indirect economic losses. Therefore, the lightning protection of transmission line is the key to avoid the accident and improve the reliability of power supply. In order to solve the above problems, this paper studies the general law of lightning pulse group arc construction by means of theoretical modeling, simulation and scientific experiment, including the superposition of lightning pulse current. The general law of energy superposition and the truncation of power-frequency continuous flow under the action of arc-extinguishing airflow, and the residual pressure characteristics of superimposed lightning pulse groups in high altitude, high temperature and high salt areas, etc. The general law of lightning reignition and power frequency reignition is studied. The energy and distribution characteristics of arc extinguishing gas flow, such as pressure, temperature and velocity, as well as the elastic recovery mechanism of arc extinguishing gas flow and the key factors affecting the mechanism are studied. The accumulation effect of superimposed lightning pulse in arc extinguishing pipeline and the dynamic characteristics, model and effect of arc under the action of strong gas flow are studied. This paper studies the process of dredging blocking under the action of pulse-coupled power-frequency energy, including the recovery of repeated thermal ionization breakdown in the gap, the discrete strong gas-flow coupling arc, and the energy accumulation in the arc-quenching channel, and so on. In this paper, the dredging blocking process under the coupling of lightning pulse and power frequency energy is studied, and the different coordination in space, time and intensity between the arc suppression and the arc suppression in discrete strong airflow under superimposed pulse-like pulses is studied.
【學位授予單位】:廣西大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM863
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