电压-频率转换器在电子式互感器中的应用

The Application Study of Voltage-Frequency Converter in Electronic Current Transducer

由电压-频率转换器(VFC)特性的理论分析和数据计算结果的分析表明,VFC因原理性误差会遗失一些频率分量,但对于保护用信号转换,特别是对基于特定谐波分量而言,由于可以简化互感器的信号处理电路,便于实现各装置间采样信号的同步,非常适用于基于微分型传感原理的电子式互感器在电力系统的保护和控制领域的应用.

The characteristics of vohage-frequency converter（VFC）through theoretical analysis and data computations are introduced in this paper. It is shown that VFC has obvious advantages for use of protective relay, especially for the uses of some special harmonic based protection compared with the common ADC, although it may miss some values of frequency components and induce definite principle error. The signal processing circuit and the interface between the electronic instrument transformer and the CPU of the following processing unit are simplified. Moreover, it can make the signal sampling synchronization easy for different measuring apparatuses. This converting mode is especially suitable for the application of differential type sensing principle based electronic instrumental transducer in the protective relaying and control field of electric power system.