Research of measurement of capacitive current based on DSP

Firstly, this article analyzed the principle of capacitive current measurement by injecting signal method, then expatiated the project that the measurement of capacitive current by digital signal processor (TMS320F2812). This article Using DSP to measure the capacitive current. The method is that measuring capacitive current by injecting constant current changes frequency-signal to the secondary side of Petersen coil and finding the resonance frequency of the distribution power network system. The realization of this method is good to integration of distribution network parameters and to the choice of arc-suppression device. Experiments show that the method is accurate, convenient, and security for measuring capacitive current.