[Oral Presentation]Study on Relationship between Cumulative Discharge Energy and Discharge Marks on Pressboard under High Field Strength

Study on Relationship between Cumulative Discharge Energy and Discharge Marks on Pressboard under High Field Strength

ID：7 Submission ID：1729 View Protection：ATTENDEE Updated Time：2020-10-15 14:05:52 Hits：323 Oral Presentation

Start Time：2020-11-02 15:30 （Asia/Shanghai）

Duration：15min

Session：[D] High Voltage and Insulation Technology » [D1] Session 4 and Session 9

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Abstract

The insulation field strength of the UHV transformer is close to the design limit, which leads to the continuous increase of the working field strength of the oil-paper insulation structure. In order to explore the correlation between the development of PD and surface discharge marks on pressboard under high field strength, this paper used an extremely uneven electric field with a strong vertical component to study the development process of discharge marks and PD parameters under high field strength. The research found that PD under high field strength could cause serious damage to pressboard, resulted in white marks, spark discharge channels and carbonized marks. Based on the discharge repetition rate and discharge energy, the PD could be divided into three stages named the generation, fast extension and near breakdown stage respectively. The development of cumulative discharge energy and the growth of carbonized mark have the same law in three stages.

Keywords

Extremely uneven electric field,Carbonized marks,Discharge repetition rate,Development stages,Cumulative discharge energy

Speaker

Yiheng Wei

State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology Chongqing University

Zhiren Xu

State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University)

Yiheng Wei

Chongqing university

Submission Author

Yiheng Wei Chongqing university

Yiheng Wei State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology Chongqing University

Zhiren Xu State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University)

Huanchao Cheng China Electric Power Research Institute Beijing

Lijun Yang State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology Chongqing University

Xiangdi Meng State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology Chongqing University