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电网技术  2014 

模拟量输入合并单元计量性能测试研究

DOI: 10.13335/j.1000-3673.pst.2014.12.040, PP. 3522-3527

Keywords: 模拟量输入合并单元,数字化电能计量系统,计量性能测试,测试规范

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Abstract:

目前对模拟量输入合并单元的计量性能研究较少,现有合并单元测试规范中与误差相关的部分均参照电子式互感器标准制定,难以满足计量性能测试的要求,限制了数字化电能计量技术的发展。为研究模拟量输入合并单元的计量特性,从信号流程角度,分析了模拟量输入合并单元的误差环节,比较了模拟量输入合并单元与电子式互感器和电子式电能表的结构异同,总结了计量特性误差影响因素。并以基本误差为例,按照不同标准对2台不同厂家生产的标称0.2S级准确度的合并单元进行了单相和三相误差测试。测试数据显示单相测试和三相同时测试的结果有差异,说明各通道相互之间有影响,且输入信号越小,相互影响越大。针对现有合并单元测试规范不能正确反映计量性能的问题,提出评价模拟量输入合并单元计量性能时,不能仅仅参考电子式互感器标准,还应参考电子式电能表检定规程增加计量性能相关测试项目,完善计量用合并单元的相关测试规范。

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