交流特高压系统过电压问题研究

发布时间：2018-04-27 15:22

本文选题：特高压 + 单相接地故障过电压　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：我国第一条特高压交流输电线路在2009年投入运行,虽然在这几年在特高压交流输电方面积累了很多经验,然而对于特高压系统的认识仍然有很多的不足,尤其是因为特高压交流输电线路故障过电压问题比超高压系统更为严重,所以此论文将主要研究特高压交流系统单相接地故障过电压和快速暂态过电压的相关问题。论文主要工作及成果包括三个方面:一是计算得出特高压交流长线路单相接地故障过电压,利用某软件仿真系统,对单相接地故障过电压进行模拟计算,综合各种影响因素后,求出特高压线路单相接地故障过电压的最大值。二是在求取其最大值后,深入探讨相应过电压限制方法。研究发现,采用避雷器(metal oxide arrester简称MOA)和高抗联合作用是一种有效的方法,论文详细研究了线路合理的分段方式,从而得出不同的限制水平和线路所能达到的最大长度和合理的分段方式,并为实际运行提供有效的参考。三是重点研究对入侵特高压变压器的快速暂态过电压(Very Fast Transient Over-voltage简称VFTO)波前陡度的限制措施,以对主变纵绝缘进行保护为出发点,制定套管与架空线长度、波前陡度之间的相关参数,提出了如何才能确保过电压的安全距离。最后一部分针对特高压气体绝缘金属封闭开关设备(Gas Insulated Switchgear简称GIS)变电站与开关场部分存在的部分差异,对两者的区别进行探讨,并对两者的GIS的主绝缘、主变的主绝缘和纵绝缘以上三方面进行分析研究,最后提出一些实用性较强的建议。
[Abstract]:The first UHV AC transmission line in China was put into operation in 2009. Although a lot of experience has been accumulated in UHV AC transmission in recent years, there are still many deficiencies in the understanding of UHV system. Especially because the problem of fault overvoltage in UHV AC transmission line is more serious than that in UHV system, this paper will mainly study the overvoltage and fast transient overvoltage in UHV AC system. The main work and achievements of this paper include three aspects: first, the over-voltage of single-phase grounding fault of UHV AC long line is calculated. By using a software simulation system, the over-voltage of single-phase grounding fault is simulated and calculated. The maximum overvoltage of single-phase grounding fault in UHV transmission line is obtained. Second, after the maximum value is obtained, the corresponding overvoltage limiting method is discussed in depth. It is found that the combination of metal oxide arrester (MOA) and high resistance is an effective method. The maximum length and reasonable segmenting mode of different limiting levels and circuits are obtained, and effective reference is provided for practical operation. The third is to focus on the limitation measures for the fast transient overvoltage of intrusive UHV transformers, very Fast Transient Over-voltage (VFTO) wavefront steepness, in order to protect the longitudinal insulation of the main transformer, the length of bushing and overhead line is determined. The relative parameters between wavefront steepness are proposed to ensure the safe distance of overvoltage. The last part discusses the difference between the gas Insulated Switchgear substation and the switch field, and discusses the main insulation of the two GIS. The main insulation and longitudinal insulation of main transformer are analyzed and studied. Finally, some practical suggestions are put forward.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM86

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