With the progress in power electronics, ac voltages with various harmonic components are often applied to insulating materials of power apparatus. Water treeing is the most-observed degradation pattern in polyethylene-insulated power cables, and much work has been done. Nevertheless little is known about their dielectric properties under above-mentioned particular ac voltages. In this paper, the authors examine the influence of superposition of a low-frequency ac voltage (0.1 to 5 Hz) and a high-frequency 2-kHz ac voltage on the growth of water trees in polyethylene. It has become clear that the number of consecutive voltage zero-crossings in the instant of the polarity reversal of the low-frequency voltage plays an important role in the length and shape of water trees.
|出版ステータス||Published - 2003|
|イベント||Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials - Nagoya, Japan|
継続期間: 2003 6月 1 → 2003 6月 5
|Conference||Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials|
|Period||03/6/1 → 03/6/5|
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