摘要: The frequency, current, and phase of the transmission of high-voltage power lines are important measures of the quality of the power transmission. Therefore, it is very important to monitor the power transmission quality in real t... 展开 The frequency, current, and phase of the transmission of high-voltage power lines are important measures of the quality of the power transmission. Therefore, it is very important to monitor the power transmission quality in real time. This thesis designs a portable non-contact online monitoring system for power quality of tramsmission lines. Using electromagnetic inductionprinciple to collect the induced current of AC high-voltage trasmission lines. The signal processing circuit converts the collected current signal into a stable voltage signal and displays the output. The current waverforms in the transmission lines can be monitored in real time. Experimental result show that the system can obtain current amplitude of instantaneous high-voltage transmission line, waveform quality, frequency fluctuations and other information. 收起