Abstract
Electromagnetic-activity signals that arise in an air discharge gap under the action of an alternating voltage at a frequency of 50 Hz were studied using an omnidirectional antenna, a measuring pulse transformer, and an oscilloscope. The frequency range with the maximum signal-to-noise ratio for partial discharge signals was determined. Partial discharges that cause a breakdown in the air discharge gap and that are identical in the apparent-discharge value to partial discharges in the polymer insulation were simulated using a system of surface-needle electrodes. Corona discharges were modeled. Amplitude-phase diagrams were constructed for distinguishing corona signals from partial-discharge signals. Model discharges made it possible to investigate the specific features of a polymer-insulation breakdown.
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