电信号有效值测量综合误差分析与模型  

Composite Measurement Error Analysis and Model Research of Electrical Signals RMS

作　　者：胡华波[1] 武建文[1] 张路明 廉世军 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100083 [2]珠海可利电气有限公司,珠海519015

出　　处：《电工技术学报》2012年第12期172-177,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50877002);高等学校博士学科点专项科研基金(2000800060004)资助项目

摘　　要：在电信号测量系统设计过程中,合理分配各误差源的误差比重能有效地降低系统的总误差。本文分别分析了电信号的频率变化、电信号的测量范围,传感器的精度、A-D的精度及数据移位处理的影响,推导出电信号有效值测量综合误差的数学模型,通过仿真验证了误差模型。同时在设计的继电保护样机上应用该模型,实现了在小电流1A下测量误差不超过0.4%,电流5A及以上测量误差不超过0.2%。此误差模型为测量系统误差分配最优设计提供了理论依据。The total error of the system can be reduced effectively by a reasonable distribution proportion of the error sources when the electrical signal measurement system was designed.The effect of the signal frequency change,the signal measurement range,the transducer precision,the A/D precision,and the data shifting were analyzed in this paper.Moreover,an integrated measurement error of electrical signals RMS（root-mean-square） mathematical model was deduced,and the error model was verified by the calculation results.Meanwhile,the error model was applied to the relay protection prototype.1A low current with the measurement error low then 0.4% and 5A（or above） current with the measurement error low then 0.2% were achieved in this paper.The model of error calculation provides the basis for the best design of Error distribution on measurement system.

关 键 词：有效值 频率变化 误差分析 误差模型 误差分配 

分 类 号：TM561[电气工程—电器]