真空断路器投切并联电抗器的过电压限制

发布时间：2018-05-16 16:27

本文选题：无功补偿 + 电抗器　；参考：《东南大学》2016年硕士论文

【摘要】：随着电力电子等科学技术的飞速发展,工矿企业大量使用大功率电力电子设备对大型、冲击型负载供电,使得电能质量问题越来越突出、特别是无功不足的问题。如果不进行无功补偿,负载的无功功率将在大范围内波动,系统中的电气设备容量无法得到充分利用,网络传输能力降低、损耗增加。因此需要在电网中采取相应的措施来进行无功补偿。参照长距离架空线路无功补偿的方式,10kV～35kV配电系统中一般采用就地并联电抗器进行无功补偿,通过电压无功控制系统,并根据电网系统状态决定电抗器投入的数量,由真空断路器负责电抗器的投入或退出。真空断路器灭弧能力强,往往在投切过程中会产生截流过电压、重燃过电压。近几年国内已多次发生因投切电抗器产生操作过电压,导致所用变、开关柜闪络等故障,甚至引发开关柜烧毁的事故,严重影响了变电所的安全运行。本文针对真空断路器投切电抗器的过电压进行理论分析和试验研究,从理论上分析过电压产生机理,以及影响过电压大小的因素。2011年至2013年期间,南京电网曾发生多起因真空断路器投切电抗器而导致设备损坏的故障实例,结合故障实例对这些故障原因进行了分析,并模拟事故发生过程,在现场进行了投切电抗器过电压测试工作。并以现场得到的试验数据为基础,结合在试验室内投切电抗器的过电压研究工作,提出过电压防护措施,并在电网系统内现场应用,验证该防护措施的效果,根据验证结果确定推广方案。做到完全消除因真空断路器投切电抗器而产生的过电压。
[Abstract]:With the rapid development of power electronics and other science and technology, industrial and mining enterprises use large power electronic equipment to supply power to large and impact load, which makes the power quality problem more and more prominent, especially the problem of insufficient reactive power. If reactive power compensation is not carried out, the reactive power of the load will fluctuate in a wide range, the capacity of the electrical equipment in the system will not be fully utilized, the transmission capacity of the network will be reduced and the loss will be increased. Therefore, it is necessary to take appropriate measures to compensate reactive power in the power grid. Referring to the way of reactive power compensation of long distance overhead lines, the reactive power compensation of 10kV / 35kV distribution system is generally carried out by using local parallel reactor, and the quantity of reactor input is determined by the voltage and reactive power control system, and according to the state of the power system, the quantity of reactor input is determined according to the state of power network system. The vacuum circuit breaker is responsible for the input or exit of the reactor. Vacuum circuit breaker has strong arc extinguishing ability, it often produces overvoltage and reburning overvoltage in switching process. In recent years, the operation overvoltage caused by the switching reactor has occurred many times in China, resulting in the use of changes, switchgear flashover and even caused the accident of switchgear burning, which seriously affected the safe operation of the substation. In this paper, the overvoltage of vacuum circuit breaker switching reactor is analyzed theoretically and experimentally, and the mechanism of overvoltage and the factors influencing overvoltage are analyzed theoretically. There have been many failure cases of equipment damage caused by vacuum circuit breaker switching reactor in Nanjing Power Grid. The causes of these failures have been analyzed and the accident process has been simulated. The overvoltage test of switching reactor is carried out in the field. Based on the test data obtained in the field, combined with the overvoltage research work of switching reactor in the test room, the overvoltage protection measures are put forward and applied in the power system to verify the effectiveness of the protective measures. According to the result of verification, the extension scheme is determined. Achieve complete elimination of vacuum circuit breaker switching reactor and the generation of overvoltage.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM561.2;TM472

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