变电站地网工频接地电阻安全允许值评估  

Evaluation of Allowable Value of Power-frequency Grounding Resistance of Substation Grid

作　　者：沈文光[1] 兰静[1] 

机构地区：[1]广东省电力设计研究院,广州510663

出　　处：《电气技术》2009年第11期94-96,共3页Electrical Engineering

摘　　要：本文介绍变电站接地网设计和施工中接地网接地电阻确定的程序、事项和限制性因素。以一个110kV变电站为例,考虑接触电势、冲击反击电压、工频反击电压等分别计算接地电阻安全允许值,结果表明允许值最高的是由接触电势计算出的变电站工频接地电阻值,选择接地电阻安全允许值应该以此值作为限制值。The paper introduces programs, particulars and some limiting factors in the design and construction of the grounding resistance of grounding grid in substation. As exampled for a 110kV substation, the allowable safe value of power-frequency grounding resistance is calculated considering contact potential, impulse/ AC breackback voltage etc., the results show the highest safe allowable value is due to contact potential, so the contact potential should be considered when choosing allowable safe value of power...

关 键 词：变电站 接地网 接地电阻 接触电势 

分 类 号：TM862[电气工程—高电压与绝缘技术]