35kV高压并联电容器组运行状态监测装置的研究及应用

发布时间：2018-11-05 17:18

【摘要】：高压并联电容器组年事故率高,时不时会有“群爆群伤”的大型事故的发生,对电力系统的安全稳定运行及运行、检修人员的人身安全都构成了较大的威胁。由于高压并联电容器装置故障类型较多,但是高压并联电容器装置缺少有效的监测设备,并且目前国内电力部门缺少500kV变电站35kV高压并联电容器组故障的第一手资料,所以仅根据故障现场掌握的情况难以准确判定故障原因和提出有针对性的改进措施。500kV变电站35kV电容器组是由多台电容器串并联构成的,通常不会发生突发性的全部电容器损坏事故。需采取在线监测单台电容器的电流及电容器组的电压情况,并进行分析判断,实现电容器状态的实时评估和故障、异常的及时报警,可以及时发现电容器缺陷,避免长时间带病运行而产生故障,可以方便地调出波形、数据,直观地找出电容器故障的原因,为电容器的运行维护提供明确的指引。基于此,本文对一种35kV高压并联电容器组状态监测装置展开了研究工作:首先,通过分析高压并联电容器组的运行情况及目前的检测手段引出35kV高压并联电容器组设备故障前预防、故障中控制、故障后反馈的一种专用的运行状态监测装置的构思。其次,从合闸、分闸和运行三个阶段具体分析导致电容器故障的主要因素,通过理论分析得出结论:合闸、分闸两个阶段电容器故障主要是由涌流和过电压等因素造成,运行阶段电容器的故障主要有过电压、谐波等因素造成。然后,介绍此种运行状态监测装置的硬件及软件设计,硬件部分主要包括数据采集传输系统和高电位电源供给系统,其中高电位电源供给系统是本文的一大难点。最后,通过试验模型验证理论分析结果,并将此分析结果与现场安装运行一段时间后的实际数据进行对比得出最终结论并逐一提出有效的改进措施,以期提高电力设备的安全系数和电力系统的稳定运行。
[Abstract]:The annual accident rate of high voltage shunt capacitor bank is high and there will be a large accident of "group explosion group injury" from time to time, which poses a great threat to the safe and stable operation and operation of power system and the personal safety of overhaul personnel. Because there are many fault types of HV shunt capacitor devices, but the HV shunt capacitor devices lack effective monitoring equipment, and at present the domestic power department lacks the first-hand information of 35kV HV shunt capacitor bank faults in 500kV substation. Therefore, it is difficult to determine the cause of the fault accurately only according to the situation at the fault site. The 35kV capacitor bank in 500kV substation is composed of series and parallel of several capacitors. There is usually no sudden failure of all capacitors. It is necessary to on-line monitor the current of a single capacitor and the voltage of the capacitor bank, and to analyze and judge, to realize the real-time evaluation and fault of the state of the capacitor, to alarm the abnormal state in time, and to discover the defect of the capacitor in time. In order to avoid the trouble caused by long time operation, the waveform and data can be easily sent out, the cause of capacitor fault can be found out intuitively, and the clear guidance can be provided for the operation and maintenance of capacitor. Based on this, this paper studies a state monitoring device for 35kV high voltage shunt capacitor banks. By analyzing the operation situation of HV shunt capacitor banks and the current detection methods, the conception of a special operation state monitoring device for 35kV high voltage shunt capacitor banks is proposed, which is pre-fault prevention, fault control and post-fault feedback. Secondly, from the three stages of closing, opening and running, the main factors causing capacitor fault are analyzed, and the conclusion is drawn through theoretical analysis: the fault of capacitor in two stages is mainly caused by inrush current and overvoltage, etc. The fault of capacitor in operation stage is mainly caused by overvoltage, harmonic and other factors. Then, the hardware and software design of the device are introduced. The hardware mainly includes data acquisition and transmission system and high potential power supply system, among which the high potential power supply system is a big difficulty in this paper. Finally, the experimental model is used to verify the theoretical analysis results, and the analysis results are compared with the actual data after a period of installation and operation on the spot. Finally, the final conclusions are drawn and effective improvement measures are put forward one by one. In order to improve the safety factor of power equipment and the stable operation of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM53

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