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It takes so long time to investigate the cause of the fault occurred on power transmission line, because of no method to decide it except the survey of the outage place. Therefore, a lot of studies to predict the cause of fault based on current and voltage waveforms have been carried out. Moreover, it is necessary to measure not only the lightning current waveforms, but also voltage waveforms for minimization of lightning outage on transmission lines. Whereas various attempts have been made to measure the surge voltage on power lines, no system has been successful in practical applications, because of many problems such as sensor output fluctuation due to the weather or measurement calibration. From these backgrounds, we have devised a new method based upon electric field measurement in wide band frequency and tried to make the measuring system of surge voltage waveforms on power line. Further, we obtained the waveforms of surge voltage arisen on power system at transmission tower and substation by this system.

Study on Practical Approach to Measure the Surge Voltage Arisen on Power Transmission Line Using Wide-band Frequency Electric Field Detection Method