5–9 Jul 2016
<a href=http://www.sfpalace.com/>Palace Hotel San Francisco</a>
America/Los_Angeles timezone

Effect of hydrostatic pressure on the impulse breakdown characteristics of transformer oil

6 Jul 2016, 13:30
1h 30m
Marina

Marina

Poster Presentation Dielectrics, Insulation, and Breakdown Poster 1-C

Speaker

Mr Tonglei Wang (Xi'an Jiaotong University)

Description

The aim of this study was to clarify the hydrostatic pressure effect on the initiation and propagation process of oil streamers under the application of pulsed voltage with different polarities. The statistical characteristics of the impulse breakdown voltage and time lag in transformer oil were studied over a wide range of hydrostatic pressure, and the statistical discharge time lag and the discharge formation time lag were calculated by the Laue’s pattern. The breakdown voltage distribution can be well fitted by 3 parameter Weibull distribution. The results show that the breakdown voltage increases with the hydrostatic pressure for both positive and negative polarity. However, the increase trend is different, linear for the positive polarity and saturated for the negative polarity. At a fixed voltage, when the pressure is increased, the breakdown time lag increases slightly for the negative polarity, but remarkably for the positive polarity. The statistical time lag for negative polarity is much larger than positive polarity, and the hydrostatic pressure has greater influence for negative polarity. The characteristics of formation time lag are quite different: for negative polarity it decreases very slightly with the hydrostatic pressure, but increases remarkably for positive polarity. These differences are due to different initiation and propagation mechanisms, which are also discussed in the paper.

Primary author

Mr Tonglei Wang (Xi'an Jiaotong University)

Co-authors

Mr Heli Ni (Xi'an Jiaotong University) Meng Gao (Xian Jiaotong university) Prof. Qiaogen Zhang (Xi'an Jiaotong University) Mr Weixiong Yuan (Xi'an Jiaotong University) Mr Yuan Li (Xi'an Jiaotong University) Mr Yuqin Ding (Xi'an Jiaotong University)

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