摘要
深井接地极因占地面积小,选址容易的优点,具有很高的工程实用价值。由于单根深井接地极最大对角线距离不到1 m,明显不宜直接采用规程推荐的5倍对角线距离人工布线测量接地电阻。为此,文中建立了直流深井接地极模型,仿真计算了其接地电阻和地表电位分布,基于之提出了电流极距离要求;建立了深井接地极注流、电流极回流的模型,研究了接地电阻测量过程中深井接地极和电流极共同作用下的地表电位分布规律;结合深井接地极接地电阻的仿真计算值,分析获得了电压极的布置要求。改变电流极和电压极的位置,研究了测量误差与布线距离之间的关系,提出了深井接地极接地电阻测量的电流极和电压极布置方案。采用研究获得的方案对深井接地极接地电阻进行了实测,验证了方案的有效性和准确性。最后,分析了深井接地极与水平及垂直接地极接地电阻测量的异同,为类似深井接地极接地电阻测量以及相关标准修订提供了参考。
DC deep well grounding electrode has high engineering value due to it's small footprint and easy site selection. Because a single deep well grounding electrode's maximum diagonal distance is less than one meter, it is obviously not appropriate to measure the grounding resistance directly by using the manual recommended 5 times diagonal distance from the manual wiring. Therefore, we built a DC deep well grounding electrode model and calculated its grounding resistance. And studied the law of the surface potential distribution under the action of current field created by current electrode, combining the calculated grounding resistance value, we analyzed the layout requirements for voltage electrode. By changing the position of current and voltage electrode, we studied the relationship between measurement error and wiring distance, and put forward a scheme of current and voltage electrode layout for the measurement of the grounding resistance. The scheme of the research was used to measure the grounding resistance of the deep well grounding electrode, which verified it's validity and accuracy. Finally,we analyzed the similarities and differences of resistance measurement between deep well grounding electrode and horizontal and vertical grounding, which provides a reference for the measurement of deep grounding resistance and related standards revision.
作者
陈家峰
胡上茂
蔡汉生
李少东
贾磊
刘刚
鲁海亮
CHEN Jiafeng;HU Shangmao;CAI Hansheng;LI Shaodong;JIA Lei;LIU Gang;LU Hailiang(School of Electrical Engineering, Wuhan University, Wuhan 430072, China;State Key Laboratory of HVDC, Electric Power Research Institute, CSG, Guangzhou 510663, China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第5期69-74,共6页
High Voltage Apparatus
关键词
直流深井接地极
接地电阻测量
人工布线
地表电位分布
补偿法
DC deep well grounding electrode
measurement of grounding resistance
manual wiring
surface potential distribution
compensation method
