Abstract
The authors investigated the characteristics of the electromagnetic spectrum caused by partial discharges (PDs) in air at three different types of high-voltage substations. From the measured results, they characterized the electromagnetic noise spectrum depending on the type of substation. They also measured the long-term change of the average gain of the noise spectrum and discussed the influence of atmospheric conditions on the results. Moreover, they introduced the "equivalent charge (q/sub e/)" which was derived by converting the electric field strength estimated from the average gain into the charge magnitude of PD. They also proposed a "phase gate control method" for better understanding the electromagnetic noise spectrum characteristics and the mechanism causing electromagnetic waves from PDs.
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