摘要
针对空气间隙电气绝缘试验涉及的正态模型参数统计问题,分析了最小二乘法、加权平均法和规程法的不同特点,分别求取了空气间隙50%放电电压U_(50)和标准偏差σ的估计值,对比三种方法统计结果的差异,提出适用于大尺度空气间隙放电电压及标准偏差参数统计的方法。研究结果表明,加权平均法具有更优的估计准确度,适用于长间隙多级法试验参数统计;估计值?_(50)较■有更小的置信宽度,更易获得较为准确的估计值。
According to the parameter statistical problems related to air-gaps insulation characteristics test,this paper analyzes the different characteristics of least square method,weighted average method and procedure method.The air-gaps 50%discharge voltage and the standard deviation were estimated from test results by the three methods.The difference of statistical results from three methods were compared.One method is proposed,which is suitable for large scale air-gaps discharge voltage and standard deviation statistical parameter.Results show that the weighted average method has better estimation accuracy,and is suitable for long air-gaps multistage test parameter statistics;Estimated value 50 has smaller confidence width,and it is easier to obtain more accurate estimation value than.
作者
商豪
王学宗
SHANG Hao;HUANG Daochun(Hubei University of Technology,Wuhan 430068,China;Wuhan University,Wuhan 430072,China)
出处
《电工技术》
2018年第5期27-30,78,共5页
Electric Engineering
基金
湖北省教育厅科学技术研究项目(编号Q20141407)
湖北工业大学博士科研启动基金项目(编号BSQD12076)
关键词
参数估计
50%放电电压
标准偏差
置信宽度
parameter estimation
50%discharge voltage
standard deviation
confidence width
