输电线路高阻接地故障检测装置的研究与设计

发布时间：2018-02-08 11:47

本文关键词： 输电线路高阻接地行波电流 Rogowski线圈感应取电　出处：《南昌大学》2015年硕士论文　论文类型：学位论文

【摘要】：输电线路故障跳闸事故是电力系统最频发的事故之一,威胁着电力系统的稳定运行,给系统供电可靠性带来了极大的影响。目前,随着智能电网的建设与发展,根据输电线路故障行波电流特征,基于行波定位理论诊断出输电线路故障位置和故障原因对于电力系统运行维护及制定有效的抢修措施具有重要的意义。输电线路发生高阻接地故障时,由于闪络回路的过渡电阻比较大,行波电流幅值衰减较快,使变电站内继电保护装置难以检测到行波电流波形,给故障诊断带来了极大的难题,而高阻接地故障隐患不及时排除往往导致大面积范围的长时间停电事故。基于此,在当前国内科研成果的基础上,本文开展了输电线路高阻接地故障检测装置的相关研究工作,应用于输电线路行波故障测距及故障诊断系统,该举措的实施将有效降低智能电网跳闸率、提高供电可靠性和减少运行维护成本。本文的研究工作主要包含以下几个方面：首先,介绍了行波传输的基本理论和高阻接地故障的主要特征,对高阻接地故障行波特征进行了仿真分析,研究高阻接地故障行波线上检测的可行性。其次,分析了Rogowski线圈的工作原理,根据频谱特性分析,设计了一种宽范围且具备校正功能的Rogowski线圈,用于输电线路高阻接地故障行波电流的检测。接着,提出了输电线路高阻接地故障检测装置的硬件总体设计方案,着重研究了增强感应取能电源系统工作可靠性和降低最小启动电流的方法；根据行波数据量较大的特点,创新性地设计了一种高可靠性数据通信冗余方案,可有效解决行波数据在传输过程中丢失的问题。最后,对本装置挂网测试中采集到的树闪类高阻接地故障行波电流的应用做了进一步分析。
[Abstract]:The fault tripping of transmission line is one of the most frequent accidents in power system, which threatens the stable operation of power system and has a great impact on the reliability of power supply. At present, with the construction and development of smart grid, According to the characteristics of traveling wave current of transmission line fault, It is of great significance to diagnose the fault location and cause of transmission line based on traveling wave location theory for power system operation and maintenance and to establish effective emergency repair measures. Because the transition resistance of the flashover circuit is relatively large and the amplitude of traveling wave current attenuates rapidly, it is difficult for the relay protection device in the substation to detect the traveling wave current waveform, which brings great difficulties to the fault diagnosis. However, if the hidden trouble of high resistance grounding fault is not eliminated in time, it will lead to a long time blackout accident in a large area. Based on this, based on the current domestic scientific research results, this paper has carried out the relevant research work of the transmission line high resistance grounding fault detection device. Applied to the traveling wave fault location and fault diagnosis system of transmission line, the implementation of this measure will effectively reduce the tripping rate of smart grid. The research work of this paper mainly includes the following aspects: firstly, the basic theory of traveling wave transmission and the main characteristics of high resistance grounding fault are introduced. The characteristics of traveling wave of high resistance grounding fault are simulated and analyzed, and the feasibility of detecting traveling wave line of high resistance ground fault is studied. Secondly, the working principle of Rogowski coil is analyzed, and the frequency spectrum characteristic is analyzed. A wide range of Rogowski coil with correction function is designed, which can be used to detect the traveling wave current of high resistance grounding fault of transmission line. Then, the overall hardware design scheme of high resistance grounding fault detection device for transmission line is proposed. The methods of enhancing the reliability of induction power supply system and reducing the minimum starting current are studied emphatically, and a high reliability data communication redundancy scheme is innovatively designed according to the characteristics of large traveling wave data. It can effectively solve the problem of the traveling wave data lost in the transmission process. Finally, the application of the tree-flicker high resistance earth fault traveling wave current collected in the test of the hanging network of this device is further analyzed.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM75

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