Abstract: This paper describes a microcomputer automatic monitoring system of 6kV live wire entangglement which is based on AC sampling.It uses Fourier series in expanding calculus, to achieve the measuring and calculation of volt,current, power factor and quantity of electricity.Software is taken to achieve multiple functions instead of much more hardware, and has saved much investment in hardware,and minimised daily maintenance.The application of the system is of great significance in improving benefits of power distribution system operation and ensuring the safety of power supply. 更多