Remote real-time power system harmonics detection and monitoring via the Internet

Traditional methods to measure power system harmonics employ either the power harmonic analyser or the software package such as Matlab. They, however, usually have limited capability in the Internet connection and/or human graphical interface. In this paper, a PC-based virtual instrument (VI) that can carry out a remote detection and monitoring using LabVIEW and the microprocessor (Intel 8051) for power system harmonics is proposed. The nearby PC (server) can collect real-time waveform data that is transmitted to remote PCs (clients) for on line harmonic analysis and monitoring via the Internet. The history of total harmonic distortion (THD) in the waveform signal can be also recorded and tracked in the data base by clients. Experimental results have testified its well performance and remote capability.