基于C8051F040单片机的介质损耗变频测量仪设计

分析介质损耗传统测量方法和常用现代测量方法,现场测量时受工频电网强电场干扰的问题比较突出,介质损耗变频测量方法成为解决问题的有效方法。在用变频法进行介质损耗现场测量时,让试验电压偏离工频50Hz,使工频干扰成为异频干扰。基于这种变频法思想,结合傅里叶变换频谱分析法推导了介质损耗参数的工频等效计算公式和算法。该方案以MAX197交流数据采集芯片和C8051F040单片机为数据采集和控制处理核心,给出了系统应用中的硬件设计及数据处理方法。

Design of variable frequency dielectric loss meter based on C8051F040 MCU

Based on the analysis of conventional and modern dielectric loss measurement methods,the variable frequency measurement of dielectric loss is an effective method to suppress the interference of strong electric field of power grid on site.By setting the frequency of test voltage far away from 50 Hz,the interference of power frequency becomes bias-frequency interference.Applying Fourier transform frequency spectrum analysis,the equivalent formula and arithmetic for calculating the dielectric loss at power frequency are deduced.With MAX197 and C8051F 040 as cores of data acquisition and control processing,the system hardware design and principle of data processing are expounded.