基于电气场耦合的雷电诱导固相爆炸气流灭弧机理研究

发布时间：2019-03-28 11:11

【摘要】：雷害是电网第一杀手,大范围的停电事故严重危及国民经济所有领域和人民生活的所有方面,雷电防护是世界级难题。随着近年来电网规模的日益扩大、电压等级的不断升高,加上气候变化异常使雷电活动日益剧烈,在复杂的气候和地理条件下,线路遭受雷击的概率会更高。由雷击造成的断电、设备损害以及维修工作造成了重大的直接和间接经济损失,因此输电线路防雷保护是避免电网遭受事故和提高供电可靠性的关键。针对上述问题,本文通过理论建模、仿真与科学实验相结合的方法,研究雷电脉冲群建弧的一般规律,包括雷电脉冲的电流叠加、能量叠加以及在灭弧气流作用下的工频续流截断的一般规律,在高海拔地区、高温地区、高盐地区叠加性雷电脉冲群的残压特性等。研究雷击性重燃和工频性重燃的一般规律。研究灭弧气流的压强、温度、速度等能量特性与分布特性及影响灭弧气流的弹性恢复机制以及影响该机制的关键制约因素。研究叠加性雷脉冲在灭弧管道中的积累效应以及电弧在强气流作用下的动态特性及模型和效果。研究脉冲耦合工频能量作用下的疏导阻塞过程,包括间隙的重复热电离击穿恢复、离散型强气流耦合电弧、灭弧通道内的能量积累等过程的模型建立。研究雷电脉冲耦合工频能量作用下的疏导阻塞过程,研究叠加性类脉冲下,离散强气流灭弧与灭弧之间在空间、时间、强度上的不同配合。
[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.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM863

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