电流互感器对电能计量的影响

Effect of CT on electric energy measurement

论述了电流互感器的工作原理,建立了电流互感器的数学模型,并利用暂态仿真软件PSCAD/EMTDC对电流互感器的运行特性进行了详细分析,揭示了暂态饱和是电流互感器产生误差的主要原因。基于ADE7758计量芯片的工作原理,建立了电子式电能表的仿真模型,并对某牵引变电站的实测数据进行了计量仿真研究。仿真结果表明,电流互感器的误差导致电能计量产生较大的偏差,此结论与理论分析一致。

The working principle of CT（Current Transducer） is introduced. Its mathematical model is built and its operating characteristics are analyzed with PSCAD/EMTDC,showing that the transient saturation is the main cause of CT error. According to the working principle of metering chip ADE7758,a simulation model of electronic energy meter is built and its simulative study is carried out based on the data mea- sured in a traction substation,showing that the CT error induces larger energy measurement error,consistent with the theoretical analysis.