电缆外护层接地电流校准及不确定度评定  

Ground current calibration and uncertainty evaluation of cable outer sheath

作　　者：江翼[1] 冯振新 周玮 曹文彬 付济良 王先培[3] Jiang Yi;Feng Zhenxin;Zhou Wei;Cao Wenbin;Fu Jiliang;Wang Xianpei(Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute,Wuhan 430074,China;School of Electronic Information,Wuhan University,Wuhan 430072 China;China Electric Power Research Institute Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [2]中国电力科学研究院有限公司,武汉430074 [3]武汉大学电子信息学院,武汉430072

出　　处：《电测与仪表》2018年第23期71-76,共6页Electrical Measurement & Instrumentation

基　　金：国网科技项目《变电运维策略及装置智能化、自动化提升技术研究与应用》(524625160017)。

摘　　要：鉴于传统电缆外护层接地电流监测仪主要是在实验室对比环境下校准的,未考虑现场环境中存在背景渗出电流的干扰,设计了一种基于磁平衡式霍尔原理和消隐输入标准信号的在线校准方法。通过在线校准方法消除了背景渗出电流对校准过程的影响,提高了测量数据的准确性和可靠性。在阐述一种电缆外护层接地电流计量标准装置及设计原理的基础上,对监测仪校准结果的不确定度进行详细的评定,基于监测仪的工作原理和测试方法,通过量值传递法,验证了校准结果的可信度和不确定度的合理性。In view of the calibration process of the traditional cable outer layer grounding current monitor,which is mainly in the laboratory contrast environment,without considering the interference of background leakage current in the field environment,a zero-flux principle and post-vacuation injection standard are designed.An online calibration method that combines signals.The online calibration method eliminates the influence of background leakage current on the calibration process and improves the accuracy and reliability of the measurement data.Based on the description of a cable grounding current measurement standard device and design principle of the cable outer sheath,the uncertainty of the calibration result of the monitor is analyzed and evaluated in detail.Based on the working principle and test method of the monitor,the comparison method is adopted.The reliability and uncertainty of the calibration results are verified.

关 键 词：带电检测 电缆外护层 接地电流 校准方法 不确定度 量值传递 

分 类 号：TM472[电气工程—电器]