便携式接地网腐蚀电化学检测系统及其应用  

DEVELOPMENT AND APPLICATION OF A PORTABLE ELECTROCHEMICAL DEVICE FOR DIAGNOSE OF GROUNDING GRID CORROSION

作　　者：韩磊[1] 宋诗哲[1,2] 张秀丽[3] 李永立[3] 邱志刚[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]金属腐蚀与防护国家重点实验室,沈阳110016 [3]华北电力科学研究院有限责任公司,北京100045

出　　处：《腐蚀科学与防护技术》2009年第3期337-340,共4页Corrosion Science and Protection Technology

摘　　要：提出了接地网腐蚀状态检测的电化学方法,开发了适合现场应用的便携式快速检测系统.系统由限流探头、恒电位仪、数据采集卡、笔记本电脑以及相应数据处理软件构成.限流探头解决了电流分布的问题,数据的滤波和拟合处理可以消除噪声干扰以及土壤电阻的影响.使用时将探头插入待测地网上方土壤,施加恒电流极化,通过解析充电曲线得到表征接地网腐蚀状态的极化阻力值Rp.利用该系统在一些发电厂和变电站进行了检测,取得了良好的结果.The galvanostatic technique was adopted to diagnose the corrosion situation of grounding grid for electric substation. A portable computerized system was constructed to implement the in-field measurement, which consists of current limiting probe, potentiostat, data acquisition card, laptop and data processing software. The probe was designed to solve the current distribution problem, the data processing software was developed to eliminate the noise and the IR drop by wavelet filtering and Levenberg-Marquardt fitting respectively. The measurement procedure involve inserting the probe into the soil right above the target grounding grid, detecting the galvanostatic charge curve and finally obtaining the polarization resistance Rp as an evaluating parameter. The system was applied at several electric substations and showed good performance in these practical applications.

关 键 词：接地网 极化阻力 LABVIEW dx波变换 LEVENBERG-MARQUARDT算法 

分 类 号：TG174.3[金属学及工艺—金属表面处理]