变电站接地网的精确测量探讨  

Discussion on Precision Measurement for the Grounding Grid of Substation

作　　者：徐华[1] 刘黎[1] 陈斌[2] 

机构地区：[1]浙江省电力试验研究院,杭州310014 [2]绍兴电力局,绍兴312000

出　　处：《高电压技术》2008年第10期2205-2208,共4页High Voltage Engineering

摘　　要：变电所接地网接地电阻测量的理论基础是电位降法,最常用的测量方法是三极法,这些当前测量接地网接地电阻的多数方法只测出其电阻或者模值,为此提出了串联电阻法和改进的瓦特表法,用这2种方法可很方便获得接地网接地阻抗的阻性和感性分量。在测量过程中,电压和电流引线间的互感不能忽略,尤其是大型变电站接地网。电位线中感应电势与电流线中的电流非正交,测量引线间的互感中存在阻性分量。测量得到的接地阻抗减掉测量引线间的互感,就可得到接地网的真实接地阻抗。The theory foundation of the grounding resistance measurement of the substation is a fall-of-potential method, and the all-purpose measurement method is a three-electrode method. The current many methods of the grounding grids measurement only pay attention to the resistance component or the magnitude of the grounding impedance, therefore, this paper proposes two kinds of improvement methods： series resistance and the improved wattmeter methods, by the two methods, the resistance and reactance component of the grounding grid＇s grounding impedance can be obtained very conveniently. During the measurement, the mutual- inductance between voltage and current leading wires can not be neglected, particularly in large substation grounding grid. The induced voltage in the voltage leading wire caused by the current of the current lead wire is non-orthogonal, mutual-inductance between the measurement lead wires has the resistance component. , the ground impedance by measurement minus the mutual-inductance between the measurement lead wires, the real ground impedance can be obtained.

关 键 词：电位降法 接地网 接地阻抗倒相 电压引线 电流引线 测量 互感 

分 类 号：TM862[电气工程—高电压与绝缘技术]