基于组合波工程化测量消除引线互感的接地阻抗测量方法  

Ground Impedance Measurement Method based on Combined Wave Field Measurement to Eliminate Mutual Inductance

作　　者：张云 李谦 胡晓晖 肖云 ZHANG Yun;LI Qian;HU Xiaohui;XIAO Yun(Huizhou Power Supply Bureau of Guangdong Power Gird,Huizhou 516003,China;Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;Wuhan Kangda Electric Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]广东电网有限责任公司惠州供电局,广东惠州516003 [2]广东电网有限责任公司电力科学研究院,广州510080 [3]武汉市康达电气有限公司,武汉430070

出　　处：《计算机测量与控制》2022年第3期74-80,共7页Computer Measurement &Control

基　　金：广东电网有限责任公司科技项目(GDKJXM20185511)。

摘　　要：以正弦波电流为激励信号测量接地网接地阻抗时,由于电压线、电流线之间不可避免的存在平行共线,由此产生的互感耦合会导致接地阻抗测量结果偏高,影响接地网安全性能评估;为解决此问题,提出了一种基于组合波工程化测量消除引线互感的接地阻抗测量方法,用方波电流测量接地阻抗电阻分量,用正弦波测量接地阻抗模值,在测量现场通过改变平行共线距离获得不同互感耦合强度的测量值,解析剔除互感耦合分量后,获得准确的接地阻抗测量值;在110 kV变电站现场通过夹角法、反向法测量,并与土壤分层的接地网模型仿真结果对比,组合波工程化测量结果与接地阻抗仿真值误差仅为1%。Due to the inevitable parallel co-linearity between voltage lines and current lines,sine wave current signal is excited to measure the grounding impedance of grounding grid,the resulting mutual inductance will lead to the high grounding impedance,and the safety performance evaluation of grounding grid is affected.In order to solve this problem,a grounding impedance measurement method based on combined the wave measurement to eliminate the lead mutual inductance is proposed.The grounding impedance resistance component is measured with the square wave current,and the grounding impedance modulus is measured with the sine wave current.The measured values of different mutual inductance coupling strength are obtained by changing the parallel col-linear distance for the field measurement.After the mutual inductance coupling component is analytically eliminated,the accurate grounding impedance measurements can be obtained.Comparing the grounding grid measurement results at the 110 kV substation site by the angle method,and the reverse method with the simulation results based on the layered soil model,the error between the combined wave method measurement results and the simulation value of grounding impedance is only 1%.

关 键 词：接地网 接地阻抗 互感耦合 组合波 

分 类 号：TP242.2[自动化与计算机技术—检测技术与自动化装置] TP311.1[自动化与计算机技术—控制科学与工程]