基于局部电场的零值绝缘子检测技术研究  

Zero-value insulator detection technology based on local electric field

作　　者：张东东 常泽中 万武艺 张志劲[2] 陈久林 ZHANG Dongdong;CHANG Zezhong;WAN Wuyi;ZHANG Zhijin;CHEN Jiulin(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China;State Key Laboratory of Power Transmission Equipment Technology(Chongqing University),Chongqing 400044,China;State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]输变电装备技术全国重点实验室(重庆大学),重庆400044 [3]国网江苏省电力有限公司电力科学研究院,江苏南京211103

出　　处：《电力工程技术》2024年第4期193-201,共9页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52077018);国家电网有限公司总部科技项目“输电线路通道资源保护利用与通道扩容技术研究”(5500-202118138A-0-0-00)。

摘　　要：采用电场法可检测出绝缘子串零值片,而现有技术通常通过扫测整串绝缘子的电场分布曲线来找出绝缘子串零值片,这一方法操作难度大、效率低。文中提出通过探测绝缘子局部电场的方法来识别零值绝缘子,首先建立零值绝缘子检测仿真模型,得到含检测装置的绝缘子串电场畸变特性;然后,通过该特性获得零值片的局部电场识别判据;最后,通过设计传感器、探测装置验证仿真结果,并实现零值绝缘子的点测识别。研究结果表明,采用三阵列电场法可以实现零值绝缘子检测。装置长度应大于电场的畸变区间长度,对于文中研究对象可取130 mm;识别判据为探头1、3变化率小于10%,探头2偏差率小于50%。检测时,对于高压端和中压端,检测装置应为正对钢脚,在低压端应为正对伞裙。研究结果可为输配电外绝缘智慧运维提供理论支撑。The zero-value piece of insulator string can be detected by measuring its electric field strength.The traditional way is always by measuring the electric field distribution curve of the whole string to judge out the zero-value piece position,which is inefficient and difficult to operate in field.In this paper,an improved method of identifying zero-value insulator by just measuring the partial electric field of insulator unit is proposed.Firstly,the simulation model of insulator string zero-value unit detection is established,and the partial electric field distortion characteristic caused by zero-value piece is analysed.Then the partial electric field variation criterion for zero-value identifying is obtained basing on the simulation result.Finally,the identification method is verified by designing the detection device and carrying out the point to point zero-value piece evaluating experiments.The results show that the point to point zero-value insulator detection can be realized using the three-array-probe electric field measuring method.The length of the array should be larger than the length of the electric field distortion interval,which can be taken as 130 mm for the research object in this paper.The identification criteria is that the deviation between probe 1 and 3 is less than 10%,and the deviation between probe 2 and the average is less than 50%at the same time.When detecting zero-value piece at the high-voltage and medium-voltage end,the best position for the sensor device identification is directly facing the steel foot,while for the low-voltage end,the best position is facing the shed edge.The results of the study can provide theoretical support for the intelligent operation and maintenance of external insulation in power transmission and distribution.

关 键 词：带电检测 绝缘子 零值 电场 阵列传感器 有限元 

分 类 号：TM216.1[一般工业技术—材料科学与工程]