Design of Grounding Resistance Measurement System Based on DSP

The Grounding system is very important for the normal operation of the power system and the safety of the equipment and human. The Grounding resistance is the main parameter of the Grounding system, and the measurement of which is the important reference for judging whether the Grounding system is efficient. The paper firstly introduces the concept of the grounding system and its alien frequencies measuring method, then expatiates the hardware design project of the measurement system based on DSP (Digital Signal Processors), offers some reference circuits and design principle of the system, finally, puts forward the software disposal processing. Since the system adopts alien frequencies measuring method and digital signal processing technology, it has the characters of high measuring accuracy, lower test current, high interference killing feature, lighter equipment and convenient operation. Otherwise, in the memory expansion of the DSP system design, using the CPLD (Complex Programmable Logic Device) as the system decode device and assorting the XF node of the DSP, the system realizes the switching of the data memory after the DSP boot loader, then the data memory space of the DSP has been used more appropriate.