直流绝缘双桥臂不平衡桥差流检测方法  

Differential Current Method of Unbalanced Bridge with Double Bridge Arm for DC Insulation Detection

作　　者：黄煜炜 秦金飞 刘妮妮 黄海宏[1] HUANG Yuwei;QIN Jinfei;LIU Nini;HUANG Haihong(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Anhui Electric Power Research Institute of State Grid,Hefei 230022,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]国网安徽省电力有限公司电力科学研究院,安徽合肥230022

出　　处：《电器与能效管理技术》2019年第11期57-61,共5页Electrical & Energy Management Technology

基　　金：国家自然科学基金资助项目(51177037)

摘　　要：绝缘监察装置是变电站和发电厂用直流操作电源系统必备的检测装置。对传统的绝缘监测方法的原理进行了分析,并指出其存在的问题。目前基于不平衡桥的差流法需要结合使用直流漏电流传感器来检测分支回路的漏电流,因此漏电流传感器的精度对于差流法测量的准确性至关重要。由于直流漏电流传感器的零漂不可避免,会增加检测误差,故提出推导了能够抵消漏电流传感器零漂的双桥臂不平衡桥差流检测新算法,通过试验证明其可行性。Insulation monitoring device is a necessary detecting device of DC operation power supply system in substations and power plants.The principle of conventional insulation supervision and measurement method was analyzed,and the existing problems were discussed.Now the differential current method based on unbalanced bridge needs to detect the leakage current of the branch circuit by using DC leakage current sensor,so the accuracy of leakage current sensor is very important for the accuracy of the differential current method.Since the zero drift of the DC leakage current sensor will inevitably increase the detection error,a new algorithm of double unbalanced bridge arm which can cancel the zero drift of leakage current sensor was proposed and deduced,and the feasibility was proved by experiment.

关 键 词：直流电源系统 绝缘检测 不平衡桥 差流 直流漏电流传感器 双桥臂 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM855