Study of corona induced vibro-acoustic signals in UHV AC transmission lines

摘要

In the present paper results are described of laboratory studies of noise and vibration as well RF interference generated by corona effects in Ultra High Voltage (UHV) transmission lines. The research has been carried out in laboratory conditions, where conductors of original sizes have been subject to ultra high voltage, thus causing the occurrence of intensive corona effects. The studies included both tensioned and free-hanging conductors. Several quantities were registered in parallel, i.e. acoustic signal, vibration velocities and RF interference levels, for various voltage values, covering the range from a weak to intensive corona effect The main purpose of the study was the identification of characteristic features of the measured signals and determination of their mutual correlation's. High correlation has been shown between the acoustic noise component and the RF interference level and also the dominating velocity components of the conductor vibrations. Unexpectedly weak correlation has been found between the tonal components of the acoustic signal and both the RF interference levels and characteristic velocity components of the conductor vibrations. The above features have been even more noticeable for the tensioned conductors.