摘要
介绍一种新型高准确度电流比较仪的结构及工作原理,提出了“屏蔽定向引流”线路结构。该结构可基本消除二次绕组容性泄漏误差,并可消除二次绕组各段组合使用时引入的附加误差,提高了电流比较仪的准确度。在电流比率5 A/5 A~5000 A/5 A范围内,达到的技术指标优于1×10-6。结合“屏蔽定向引流”线路结构的特点,进一步提出了多比率电流比较仪自校准方法,其校准不确定度优于2×10^(-7)。该校准方法准确度高,稳定性好,操作简单,耗时短,可有效解决过去长期困扰的互感器长途运输送检问题。
The structure and working principle of a new type of high accuracy current comparator are introduced,and the circuit structure of"shielded directional drainage"is proposed.The structure can basically eliminate the secondary winding capacitive leakage error,and eliminate the additional error introduced in the combination of the secondary winding,and improve the accuracy of the current comparator.In the range of current ratio 5 A/5 A~5000 A/5 A,the technical index achieved is better than 1×10-6.According to the characteristics of the"shielded directional drainage"circuit structure,the self-calibration method of multi-ratio current comparator is further proposed,and its calibration uncertainty is better than 2×10^(-7).This method has the advantages of high accuracy,good stability,simple operation and short time operation,which can effectively solve the long distance transportation and inspection problems of transformers in the past.
作者
王维
刘夏
黄璐
杨雁
WANG Wei;LIU Xia;HUANG Lu;YANG Yan(National Institute of Metrology,Beijing 100029,China;Key Laboratory of Electrical Quantum Standards,State Administration for Market Regulation,Beijing 100029,China)
出处
《计量学报》
北大核心
2025年第1期112-118,共7页
Acta Metrologica Sinica
基金
国家市场监管总局质量技术基础能力建设专项(ANL2303)。
关键词
电学计量
电流比例
电流比较仪
屏蔽定向引流
自校准方法
electrical metrology
current ratio
current comparator
shielded directional drainage
self-calibration method
