Development Processes of Surface Trucking and Partial Discharge of Pressboards Immersed in Mineral Oil: Effect of Tip Curvatures

Bo Gao, Rui Yu, Guangcai Hu, Cheng Liu, Xin Zhuang and Peng Zhou
Additional contact information
Bo Gao: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Rui Yu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Guangcai Hu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Cheng Liu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Xin Zhuang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Peng Zhou: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China

Energies, 2019, vol. 12, issue 3, 1-14

Abstract: The pressboard surface is the electric weak link of the oil-paper insulation in transformers, and long-term partial discharge (PD) erosion is the dominant cause of degradation in pressboard. To explore the development processes of surface tracking under the effect of tip curvature, the typical needle-plate model was selected to initiate an electric field with a high tangential component on pressboard surface under needle tip curvature of 4~42 μm. With the help of a high-speed camera and a PD detecting system, the development processes of surface tracking and PD were recorded under a sustained AC voltage. A profound difference between surface tracking under different curvatures was discussed. Pressboard surfaces after tests were observed under a scanning electron microscope (SEM), and the damage degree of cellulose fibers was dependent on the tip curvature.

Keywords: surface tracking; PD; mineral oil; needle tip curvature; AC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/3/554/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/3/554/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:3:p:554-:d:204847

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().