Wireless Transmission System For On-line Monitoring Of Partial Discharge

Under temperature/lightning strike and internal voltage for long time, insulation of power equipment becomes aged, which leads to partial discharge. If the messures cannot be adopted, insulation breakdown may come along. The development of on-line monitoring makes it possible to find these faults. It can make sure the safe of power system by messuring the state of power equipment monitored.Based on the special merits of wireless communication, wireless transmission is pointed out for monitoring system. We choose nRF9E5 to avoid wireless interference. By studying the inner structure of nRF9E5, the software support is programmed for point-to-point communication system.This paper creates four relevant PD models upon the peculiar PD patterns of power equipment. PD experiment is done and the data is transmitted by system of data acquisition and point-to-point communication. The information received by controller center is treated and made a comparison with the primary signal of PD and we get a good result.On the basis of experiment on four relevant PD midels, the received data is treated. The characteristic of phase (φ) is got by the signal of power frequency voltage and the characteristic of PD magnitude (q) is got by the signal of PD.φ-q-n of PD is numbered in 20 millisecond. Andφ-q-n 3-D plots are made for four PD models by data treated. The results are analyzed and compared based on the plots.