【摘要】 对电子式互感器信号转换中的两种模 数转换方法的特性进行了比较研究。理论分析和计算仿真结果表明:电压 频率转换器VFC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,特别适用于电力系统的保护和控制领域;直接模 数转换式ADC具有转换精度不受系统谐波分量变化及频率波动的影响的特点,但信号处理电路和数据同步的实现稍显复杂,是一种适合于测量和保护控制通用目的的电子式互感器信号处理方案。更多还原

【Abstract】 By theoretical analysis and data computations, this paper compares the characteristics of voltage-frequency converter (VFC) and successive-approximation analog-to-digital converter (ADC). The computer simulation and experiment study results show that VFC can simplify the signal processing circuit and realize the signal sampling synchronization of different measuring apparatures easily. This converting mode is especially suitable for the protective relaying and control field of electric power system. ADC has the characteristic of the transforming accuracy not influenced by the fluctuation of frequency and the variety of harmonics of the power system. This kind of transformation design can be used for universal purpose of measurement and protective relays. Its demerit is the signal processing circuit and the realization of data synchronization are more complicated than VFC′s. This project is supported by the 33th China Postdoctoral Science Foundation.更多还原