Peng Xiangyang

Air-gap discharge energy change characteristics in oil-paper insulation and the research on the correlation with the variation of gas

A test platform was built for the research on airgap discharge and its development characteristics which based on the air-gap discharge model in oil-paper insulation, and repeated carried out 36 hours partial discharge experiments using constant voltage method under the same conditions. Calculated the maximum discharge energy Wmax and the average discharge energy Wavg of the different discharge time. At the same time, average discharge energy per second Wasec was proposed as a new feature in which the discharge repetition was considered, the analysis showed that Wasec can characterize the the development characteristics of partial discharge very well. One the other hand, the dissolved gases in the oil were analyzed, the correlation analysis between six kinds of characteristic gas and Wasec showed that the content of H2 has the highest correlation with Wasec during the development of air-gap discharge in oil-paper insulation, followed by CO and CH4. The changes in the contents of these three gases can roughly reflect the variation of the Wasec. It has great significance in engineering practice.

An improved partial discharge location method in substations: Error reduction based on Monte-Carlo simulation

Partial discharge location can find insulation defects to avoid insulation deterioration and dielectric breakdown. Most of current PD location is implemented based on TDOA principle and the location accuracy is improved through multiple measurements. In this article, a novel location method is proposed using Monte-Carlo simulation to reduce error of TDOA which only need carry out one measurement. Result shows that located angle of PD source within 1.5 degree error can be achieved when the time difference error bound is less than 3ns by using an array of 4 UHF sensors arranged in the shape of 30m×20m rectangle.

The surface structure and hydrophobic recovery of poly-dimethylsioxane insulator after ar plasma treatment

Feng Zheng1, Chunqing He1, Pengfei Fang1,∗, Zhe Chen2, Shaojie Wang1,∗, Jianguo Wang3, Xiangyang Peng4, and Zhihai Xu4 1Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China 2Department of Material Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, China 3School of Electrical Engineering, Wuhan University, Wuhan 430072, China 4Guangdong Electric Power Research Institute, Guangzhou 510080, China