110kV及以下电压等级智能变电站系统的过电压防护研究
2018-01-03温立清韩小勇
温立清 韩小勇
摘 要:防护工作在各地变电站中非常重要,当前110kV及以下电压等级智能变电站影响范围大,防护水平也有待提升。基于此,文章以110kV及以下电压等级智能变电站系统的过电压类型以及原因作为切入点,给予简述,并以此为基础,论述过电压防护措施,给出防护系统化、防护智能化等建议,最后以模拟实验方式对相关理论作系统论证,以期通过分析为后续具体工作提供必要参考。
关键词:智能变电站;过电压;降维训练;防护系统化
中图分类号:TM63 文献标志码:A 文章编号:2095-2945(2018)32-0112-02
Abstract: Protection work is very important in various substations. The current 110kV and below voltage level intelligent substation has a wide range of influence, and the level of protection also needs to be improved. Based on this, the paper takes the overvoltage type and reason of 110kV and below voltage level intelligent substation system as the breakthrough point, gives the brief introduction. Then, taking this as the foundation, it discusses the over-voltage protection measure, and gives the protection systematization, the protection intelligence and so on the suggestion. Finally, the simulation experiment is used to make a systematic demonstration of the relevant theory, in order to provide the necessary reference for the follow-up specific work through the analysis.
Keywords: intelligent substation; overvoltage; dimensionality reduction training; protection systematization
前言
过电压(over voltage)是指工频下交流电压均方根值升高,超过额定值的10%,并且持续时间大于1分钟的长时间电压变动现象,是负荷投切的瞬间的结果,正常使用时在感性或容性负载接通或断开情况下发生。我国各地110kV及以下电压等级智能变电站的建设工程较多,这也对防护工作提出了较高要求,针对过电压类型以及原因展开分析,并探讨防护措施,具有较为突出的现实意义。
1 110kV及以下电压等级智能变电站系统的过电压类型以及原因
1.1 变电站系统的过电压类型
就110kV及以下电压等級智能变电站系统而言,其过电压类型可大致分为两种,即外部过电压和内部过电压。外部过电压的发生率较低,也被称为大气过电压、雷电过电压,在变电站的工作中,直击雷和感应雷均有可能造成过电压,此时变电站可看做一个整体性的导体,雷电经变电站的避雷系统被导入地下[1]。……
