中性点经消弧线圈接地系统分析研究

发布时间：2018-01-29 04:54

本文关键词： 中性点消弧线圈接地配电网 MATLAB　出处：《吉林大学》2014年硕士论文　论文类型：学位论文

【摘要】：中性点接地方式是电网系统中的一项重要技术，并随着我国电网事业的不断发展应用愈加广泛。现今我国城市配电网的发展速度日益加快，在城市配电网中电缆的广泛应用，使得城市电网系统的接地电容量不断增加，使得单相瞬间接地故障电流增多，致使接地电流不能自行熄灭，导致单相瞬间接地故障不能被解除，如何解决这个问题。现今大多是利用中性点经消弧线圈接地系统来解决。采用中性点经消弧线圈接地系统可以降低通过故障点的电容电流，实现降低电压，便于电弧的熄灭，从而提高电网系统供电的可靠性，并具有良好的电磁兼容效果。可是这种消除电弧方式现今还存在一些不足，，例如故障选线保护的配置难度大等，值得进一步研究与完善。本文首先阐述中性点接地方式在国内外的发展情况，并指出中线点接地方式中存在的问题及其发展趋势，并进一步对中性点经消弧线圈接地系统的原理进行分析与比较，深入研究三种重要接地方式的优缺点，同时对用户供电可靠性、通信系统、人身安全、电气设备绝缘水平的各方面影响简单分析。其次，用MATLAB中的电力仿真工具对简单的配电网络进行单相接地故障仿真，并分析研究三种主要的接地方式。最后，综述中性点经消弧线圈接地系统的优点，并对中性点经消弧线圈接地方式进行相关问题的探讨。
[Abstract]:Neutral grounding mode is an important technology in the grid system, and with the application of electric power industry in our country develops more and more widely. The development speed of our country's city distribution network is accelerating, widely used in cable distribution network in the city, the city power system grounding capacity increasing, the single moment ground fault current increases, resulting in the grounding current cannot extinguish, resulting in single-phase transient grounding fault cannot be released, how to solve this problem. The most is the use of neutral grounding via arc suppression coil system to solve.
The neutral grounding via arc suppression coil system can reduce the capacitance current of fault point, lower voltage, easy to extinguish the arc, so as to improve the reliability of power supply system, and has a good electromagnetic compatibility effect. But this way the eliminate arc also has some shortcomings, such as fault line protection configuration is difficult so, worthy of further research and improvement.
This paper expounds the development situation of neutral grounding mode at home and abroad, and points out the existing line grounding in the problems and development trend, and further to the neutral principle of arc suppression coil grounding system were analyzed and compared, in-depth study of the advantages and disadvantages of three kinds of important grounding type, at the same time to the user the reliability of power supply, communication system, personal safety, the insulation level of electrical equipment of simple analysis.
Secondly, the power simulation tools in MATLAB are used to simulate the single phase grounding fault of a simple distribution network, and three main grounding methods are analyzed and studied.
At last, the advantages of neutral point through arc suppression coil grounding system are summarized, and the related problems of neutral point through arc suppression coil grounding mode are discussed.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM862

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