一种交流叠加脉冲振荡高压试验设备研制

发布时间：2018-12-18 15:26

【摘要】：干式空心并联电抗器能起到提高远距离输电线路传输能力,改善沿线电压分布和减小系统过电压等作用,在电力系统中占有重要的地位。近些年干式空心并联电抗器经常烧毁,相关研究表明,投切过电压是主要原因之一,这种过电压主要是一种在交流电压的峰值处叠加脉冲振荡的电压波形,为了研究这种过电压对干式空心并联电抗器匝间绝缘的破坏性,首先需要研制出一套产生这种特殊过电压波形的试验设备。本文应用理论分析和仿真验证的方法对投切过程中出现的截流过电压和复燃过电压进行了分析,给出了具体的电压波形;为了模拟实际电抗器匝间绝缘,制作了干式空心并联电抗器匝间绝缘试样模型,通过试验研究分别确定了试样在交流电压和脉冲振荡电压下的击穿电压水平;以电路理论为基础,提出了一种并联叠加电路和一种串联叠加电路,分别对电路原理进行了数学分析与仿真验证,确定了电路的具体参数。为了使脉冲振荡电压在交流电压的峰值处叠加和球隙一秒钟放电两次,本文还设计了一套球隙放电控制电路,并用Altium Designer仿真软件布线,将其制作成PCB电路板,通过试验验证了其可行性。在此基础上,设计相关高压部件和设备整体控制系统,组建了一套高压试验设备,用示波器观察其产生的电压波形。研究结果表明,截流过电压是一种脉冲振荡电压波形,复燃过电压是一种在交流电压的峰值处叠加脉冲振荡电压波形;在交流电压和脉冲振荡电压下干式空心并联电抗器匝间绝缘试样的击穿电压水平均为30k V;串联叠加电路产生的叠加电压波形与投切过电压更接近,交流电压和脉冲振荡电压也便于调节;通过试验发现脉冲振荡电压在交流电压的峰值附近实现了叠加,交流电压和脉冲振荡电压都能在0~30k V范围内连续调节,球隙一秒钟放电两次。最终证实本文提出的交流叠加脉冲振荡电压产生方法可行,该叠加设备可为后续干式空心并联电抗器匝间绝缘击穿试验研究打下基础。
[Abstract]:The dry-type hollow parallel reactor plays an important role in the power system because it can improve the transmission capacity of long-distance transmission lines, improve the voltage distribution along the line and reduce the system overvoltage. In recent years, dry hollow shunt reactors often burn down. Related studies show that switching overvoltage is one of the main reasons, and this overvoltage is mainly a voltage waveform superimposing pulse oscillation at the peak of AC voltage. In order to study the damage of the overvoltage to the inter-turn insulation of the dry hollow parallel reactor, a set of test equipment to produce this special overvoltage waveform should be developed. In this paper, the method of theoretical analysis and simulation verification is used to analyze the overvoltage and reburning overvoltage in the switching process, and the specific voltage waveforms are given. In order to simulate the actual interturn insulation of reactor, a sample model of interturn insulation of dry hollow parallel reactor is made, and the breakdown voltage level of the sample under AC voltage and pulse oscillation voltage is determined by experimental study. Based on the circuit theory, a parallel superposition circuit and a series superposition circuit are proposed. The principle of the circuit is analyzed and verified by simulation, and the specific parameters of the circuit are determined. In order to stack the pulse oscillation voltage at the peak value of the AC voltage and discharge the spherical gap twice in one second, this paper also designs a control circuit of the ball-gap discharge. The circuit is wired by Altium Designer simulation software, and the circuit board is made into a PCB circuit board. The feasibility is verified by experiments. On this basis, the whole control system of related high voltage components and equipment is designed, and a set of high voltage test equipment is constructed. The voltage waveform generated by it is observed by oscilloscope. The results show that the cut-off overvoltage is a pulse oscillation voltage waveform, and the reburning overvoltage is a superimposed pulse oscillation voltage waveform at the peak value of the AC voltage. The breakdown voltage level of the interturn insulation sample of dry hollow parallel reactor is 30 kV under AC voltage and pulse oscillation voltage. The superposition voltage waveform generated by the series superposition circuit is closer to the switching overvoltage, and the AC voltage and the pulse oscillation voltage are also easy to adjust. It is found that the pulse oscillation voltage can be superimposed near the peak value of the AC voltage, the AC voltage and the pulse oscillation voltage can be adjusted continuously in the range of 0 ~ 30 kV, and the spherical gap is discharged twice a second. Finally, it is proved that the method proposed in this paper is feasible for the generation of AC superposition pulse oscillation voltage, and this superposition device can lay a foundation for the subsequent test study of inter-turn insulation breakdown of dry-type parallel reactor.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM83

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