開閉インパルスの発生とその放電特性

概要

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The great increase of electrical power demand in Japan has been requiring a great amount of electric power transmission. To cope with that, the power transmission line voltage trends to rise from the extra-high voltage (EHV) to the ultra-high voltage (UHV).　In UHV transmission systems, the performance of system insulations under switching impulses becomes the most important factor in the insulation design of the systems because the reduced insulation is adopted in such systems from the economical point of view. Therefore, it is necessary to investigate the switching impulse wave-forms for the most adequate insulation design of the UHV transmission systems, and to clarify the switching impulse flashover characteristics.　As the results, it was clarified that the switching impulse waveforms which occur in the UHV transmission systems vary from 1000μs to 5000 μs, and moreover, the V-t characteristic curves for positive polarity seem to reach the minimum at about 300-500 μs. It has been found from this test that the duration of wave-front at which the flashover voltage reaches the minimum value becomes larger as the gap spacing is longer, and the 50% flashover voltage curves decrease when the duration of wave-front decreases from 5000μs to 1800μs.
山形大学の論文
1974-07-20