Study of Fault detection device based on ARM in distribution networks

Since currently in China the power supply distribution system adopts low current grounding system with indirect grounding of neutral, so the fault of single phase grounding in the system takes place frequently. With reference of actual conditions for single phase grounding fault, the paper designs a new real-time monitoring and fault diagnosis device based on ARM (S3C2410). On the one hand, the device can measure some elementary power parameters, such as the three-phase voltages, current, power, frequency etc. On the other hand, it can really monitor system status. Results of operation show that this device computing speed quickly, strong anti-jamming capability, stable operation, has the good performance-to-price ratio, is very practical in the small current grounding and the grid.