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Energies 2018, 11(2), 327; https://doi.org/10.3390/en11020327

Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

1
State Key Lab of Electrical Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
3
AC Project Construction Branch, State Grid Corporation of China, Beijing 100052, China
*
Author to whom correspondence should be addressed.
Received: 28 December 2017 / Revised: 25 January 2018 / Accepted: 26 January 2018 / Published: 2 February 2018
(This article belongs to the Section Electrical Power and Energy System)
Full-Text   |   PDF [7065 KB, uploaded 2 February 2018]   |  

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. View Full-Text
Keywords: silicone rubber; electrical tree; bubble; high frequency; initiation voltage; growing model silicone rubber; electrical tree; bubble; high frequency; initiation voltage; growing model
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Zhang, Y.; Zhou, Y.; Zhang, L.; Zhou, Z.; Nie, Q. Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies. Energies 2018, 11, 327.

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