宽负荷范围内电能准确计量方法研究  

Research on Accuracy Measurement of Electric Energy in Wide Load

作　　者：杨华云[1] 姜南希[1] 张嘉岷[1] 

机构地区：[1]四川电力试验研究院,成都610072

出　　处：《电测与仪表》2009年第8期22-25,共4页Electrical Measurement & Instrumentation

摘　　要：分析了负荷电流宽幅变化时对计量用电流互感器准确度的影响,给出了负荷电流宽幅变化时影响计量用电流互感器准确度的解决方法。一种是直接采用s级电流互感器。另一种采用基于带抽头的多变比非s级电流互感器计量方法,并给出了其工作原理,对其提高在低负荷电流条件下电能计量准确度作了分析,并通过实验研究进行了验证。实验结果表明,这两种方法都能够保证在1%到120%的负荷范围内保证电能计量的准确度,而且避免了多变比电流互感器的人工倒换接线,提高了效率。The accuracy of current transformer is analyzed when its primary current is changed within a large range. The method of improving the accuracy of current transformer is given out when the power load is changed within a large range. A method is that the s-class current transformer is used directly. Another method is a novel measurement system based on multi-transformation ratio current transformer. The operation principle of the power energy metering system is discussed in detail. Then how to improve the accuracy of the electric energy measurement is analyzed in low load, and the experiment is given out in this paper. The experiment results show that the accuracy of the power energy metering can be ensured when the load is changed in 1% to 120% of the rated load.

关 键 词：电能计量 电流互感器 准确度 误差 

分 类 号：TM933[电气工程—电力电子与电力传动]