基于改进型两次平衡对检法的感应分压器自校准方法  

Self-calibration Method of Inductive Voltage Divider Based on Improved Incremental Buildup Method

作　　者：冯建[1] 孙健[1] 潘洋[1] FENG Jian;SUN Jian;PAN Yang(Shanghai Key Laboratory of On-line Testing and Control Technology,Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China)

机构地区：[1]上海市计量测试技术研究院上海市在线检测与控制技术重点实验室,上海201203

出　　处：《计量学报》2022年第5期643-648,共6页Acta Metrologica Sinica

基　　金：国家重点研发计划(2016YFF0201201,2017YFF0205703);上海市市场监督管理局科研项目(2019-03)。

摘　　要：介绍了参考电势变压器和指零仪变压器设计原理,分析了屏蔽间泄漏对测量结果的影响;对常规两次平衡参考电势对检法进行了改进,使零平衡和段平衡测量过程中,参考电势和测差电路均可实现等电位保护;对自校准方法进行了推导,校准结果仅与段平衡和零平衡时锁相放大器测量的电压差值相关,与参考电势变压器、指零仪变压器、辅助变压器等的误差无关,屏蔽间泄漏的影响也得到消除。对1 kV感应分压器进行了校准实验,并对校准结果进行了测量不确定度分析,其相对扩展不确定度的评估结果为5.4×10^(-8)(k=2)。The design method of reference voltage transformer and null detection transformer was introduced.The influence of leakage current between shielding of the transformers was analyzed.The classic incremental buildup calibration method was improved.Both the reference voltage and voltage difference measurement circuit got equipotential protection in zero balance and section voltage balance measurement procedures.The process of self-calibration method was derived.Calibration result was only related to the voltage difference measured by the lock-in amplifier during two balance procedures.The influences of reference voltage transformer,null detection transformer,auxiliary transformer and leakage current between shielding were removed.The calibration results of 1 kV inductive voltage divider was presented,and the measurement uncertainty was evaluated,the relative expanded uncertainty was 5.4×10^(-8)(k=2).

关 键 词：计量学 感应分压器 两次平衡对检法 自校准 参考电势 屏蔽泄漏 不确定度 

分 类 号：TB971[一般工业技术—计量学]