消除引线互感影响的地网接地阻抗测量方法  

Measuring Method of Grounding Impedance in Grounding Grid with Eliminating Influence of Mutual Inductance Between Leads

作　　者：马御棠 张博成[2] 周仿荣 翟兵 张凯军[2] 汪祥[2] 胡志坚[2] 

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]武汉大学电气工程学院,武汉430072

出　　处：《电瓷避雷器》2017年第4期73-77,共5页Insulators and Surge Arresters

摘　　要：在地网接地阻抗测量时,电压和电压测量引线之间存在互感,从而影响接地阻抗测量结果的准确性,因此有必要开展消除测试引线互感对接地阻抗测量影响的研究。提出了一种电流极和电压极同方向布置,通过改变电极位置,两次注入异频电流,测量对应的电压和电流,联立方程消除测试引线互感的新型接地阻抗测量方法。利用PSCAD对典型接地装置进行了仿真,在实际独立接地装置上进一步对该方法进行了测量验证,仿真和实测结果均表明,在不同的引线间距下,所提方法基本都能消除引线间互感的影响,得到更准确的地网接地阻抗值。In the measurement of grounding resistance of grounding grid, because of the presence of mutual inductance between the measuring leads, the accuracy of the measurement results will be affected. Therefore, it is necessary to carry out the research on eliminating the effect of the mutual inductance between the measuring leads. A novel method for measuring grounding impedance is presented. For this method, the current and voltage electrode are arranged in the same direction, injecting non-power frequency current to the current lead and measuring the corresponding voltage and current, the effect of the mutual inductance between the measuring leads is eliminated by solving the simultaneous equations using measured data. The influence of mutual inductance between the measuring leads of typical grounding device is simulated by using PSCAD, and this method is carried out on the actual independent grounding device. Both the simulation and the measured results show that the proposed method can effectively eliminate the influence of the mutual inductance between the leads and obtain a more accurate value of ground impedance with different lead spacing.

关 键 词：地网 接地阻抗 互感 异频法 直线法 

分 类 号：TM934.7[电气工程—电力电子与电力传动]