Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents

WU Guangning; ZHOU Peng; GAO Bo; YU Rui; HU Guangcai

doi:10.3969/j.issn.0258-2724.20190210

Volume 55 Issue 3

Jun. 2020

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Journal of Southwest Jiaotong University > 2020 > 55(3): 552-560.

WU Guangning, ZHOU Peng, GAO Bo, YU Rui, HU Guangcai. Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210

Citation:

WU Guangning, ZHOU Peng, GAO Bo, YU Rui, HU Guangcai. Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210

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Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents

doi: 10.3969/j.issn.0258-2724.20190210

Received Date: 02 Apr 2019
Rev Recd Date: 09 Jun 2019

Available Online: 16 Sep 2019

Publish Date: 01 Jun 2020

Abstract

Abstract

The increase of moisture content in power transformer will seriously affect the insulation performance of oil-paper, more easily resulting in the surface discharge fault of insulated pressboard. In order to study the discharge characteristics of insulated pressboard with different moisture contents under AC condition, a typical model of needle board surface discharge was established. Based on the pulse current method, the characteristic charts of the surface discharge model were measured in real time, and a high-speed camera was used to record the formation and development of white mark on insulated pressboard. The variation trend of initial discharge voltage and flashover voltage under different moisture contents of pressboard was analyzed, and then that of the related discharge characteristic parameters was analyzed. The results show that the increase of moisture content in pressboard significantly reduces the onset voltage. The process of surface discharge and white mark formation and development on pressboard with different moisture contents can be divided into four stages. There is a one-to-one relationship between the four stages of surface discharge and white mark formation and development. By observing and analyzing the microstructure of insulated pressboard, it is found that the fibers of the pressboard were severely broken after tests. The higher the moisture content of the pressboard before tests, the more serious the damage to the surface of the pressboard. When the moisture content of pressboard increases from less than 0.5% to 3.8%, the initial discharge voltage decreases by 61.3%.
- surface discharge,
- moisture content,
- discharge characteristics,
- white mark,
- microstructure

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References(23)

References

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