电力系统短路电流计算与分析
摘 要
短路电流将引起下列严重后果：短路电流往往会有电弧产生，它不仅能烧坏故障元件本身，也可能烧坏周围设备和伤害周围人员。巨大的短路电流通过导体时，一方面会使导体大量发热，造成导体过热甚至熔化，以及绝缘损坏；另一方面巨大的短路电流还将产生很大的电动力作用于导体，是导体变形或损坏。电力系统正常运行的破坏多半是由短路故障引起的。发生短路时，系统从一种状态剧变到另一种状态，并伴随产生复杂的暂态现象。所谓短路，是指一切不正常的相与相之间或相与地发生通路的情况。在三相系统中，可能发生的短路有：三相短路、两相短路、两相短路接地和单相接地短路。
【关键词】 短路、对称短路、不对称短路
Calculation and analysis of short circuit current in power system
Abstract
Short circuit current will cause the following serious consequences: short circuit current tend to produce arc, which can not only burn out fault element itself may also burn the surrounding equipment and harm the surrounding personnel. A huge short-circuit current through a conductor, on the one hand will make a lot of heat conductor, caused by conductor overheat and melt, and insulation damage; another huge short-circuit current will also produce great role electric power to the conductor, conductor deformation or damage. The destruction of the normal operation of the power system is mostly caused by short circuit fault. When a short circuit occurs, the system changes from one state to another, and is accompanied by a complex transient phenomenon. The so-called short, refers to the occurrence or pathway and all abnormal phase condition. In the three phase system, the short circuit is likely to occur: Three - phase short circuit, two phase short circuit, two phase short circuit and single phase to ground fault.
[Key words] short circuit, symmetrical short circuit, asymmetrical short circuit
目 录
1 设计任务 1
2 设计原理 2
2.1 两相短路 2
2.1.1 两相短路各序网络的制定 2
2.1.2 不对称三相量的分解 3
2.2 三相短路 4
3 计算过程及步骤 6
3.1 系统C的正序电抗计算 6
3.2 K点发生两相短路时故障点电流计算 7
3.3 K点发生abc三相短路时故障点电流 8
3.4 K点发生bc相间短路时发电机G和系统C分别提供故障电流计算 9
3.4.1 K点发生bc相间短路时系统C提供故障电流计算 9
3.4.2 K点发生bc相间短路时发电机G提供故障电流计算 10
3.5 K点发生abc三相短路时发电机G和系统C分别提供的故障电流 11
4 仿真实验 12
4.1基于公用资源的交直流电力系统分析程序包有以下应用功能 12
4.2仿真结果部分截图 13
结果分析 17
总 结 18
致 谢 19
参考文献 20
参考文献
[1] 李庚银.电力系统分析基础[M].北京：机械工业出版社，2011.8
[2] 中国电力科学研究院.短路计算用户手册[M].2010.6；
[3] 中国电力科学研究院.潮流计算用户手册[M].2010.6：
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