Abstract
The insulation property at high voltage frequencies has become a tough challenge with the rapid development of high-voltage and high-frequency power electronics. In this paper, the electrical treeing behavior of silicone rubber (SIR) is examined and determined at various voltage frequencies, ranging from 50 Hz to 130 kHz. The results show that the initiation voltage of electrical trees decreased by 27.9% monotonically, and they became denser when the voltage frequency increased. A bubble-shaped deterioration phenomenon was observed when the voltage frequency exceeded 100 kHz. We analyze the typical treeing growth pattern at 50 Hz (including pine-like treeing growth and bush-like treeing growth) and the bubble-growing pattern at 130 kHz. Bubbles grew exponentially within several seconds. Moreover, bubble cavities were detected in electrical tree channels at 50 Hz. Combined with the bubble-growing characteristics at 130 kHz, a potential growing model for electrical trees and bubbles in SIR is proposed to explain the growing patterns at various voltage frequencies.
Highlights
Electrical trees are pre-breakdown phenomena that accelerate the occurrence of insulation failure [1,2,3,4,5,6,7]
Owing to the harsh working conditions of power electrical equipment, there have been many investigations to determine the influence of temperature, voltage type, voltage frequency, thermal aging, and moisture on electrical treeing characteristics [8,9,10,11,12,13,14,15]
Both of them cause the initiation of denser electrical trees with increasing voltage frequency
Summary
Electrical trees are pre-breakdown phenomena that accelerate the occurrence of insulation failure [1,2,3,4,5,6,7]. Most experiments were carried out below 10 kHz, and 2there remain uncertainties to determine the mechanisms responsible for electrical treeing development under high voltage frequencies. The processes of the initiation and development of electrical trees were automatically to 130 kHz. Electrical treeing initiation and growing patterns of SIR samples were systematically recorded via a digital microscopic imaging system at various voltage frequencies that range from analyzed. 50 Hz to 130 kHz. Electrical treeing initiation and growing patterns of SIR samples were systematically been observed at lower voltage frequencies, occurred at 130 kHz. the bubble-growing analyzed. A potential growing model for electrical trees in SIR was observed at lower voltage frequencies, occurred at 130 kHz. the bubble-growing characteristics proposed to provide a reasonable explanation for the different tree-growing patterns at different were evaluated. A reasonable explanation for the different tree-growing patterns at different voltage frequencies
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