The Study of VFTO Distribution in the Insulation System of IOCT Used in Traction Network

Zhonghuan Su, Longfu Luo, Jun Liu, Zhongxiang Li, Hu Luo and Haonan Bai
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Zhonghuan Su: College of Electrical and Information Engineering, Hunan University, Changsha 410000, China
Longfu Luo: College of Electrical and Information Engineering, Hunan University, Changsha 410000, China
Jun Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410000, China
Zhongxiang Li: College of Electrical and Information Engineering, Hunan University, Changsha 410000, China
Hu Luo: College of Electrical and Information Engineering, Hunan University, Changsha 410000, China
Haonan Bai: Key Laboratory of Special Motors and High Voltage Electrical Appliances, Ministry of Education Shenyang University of Technology, Shenyang 110870, China

Energies, 2022, vol. 15, issue 2, 1-13

Abstract: The FDS (Frequency-domain Dielectric Spectroscopy) of oil-immersed insulation paper, and semi-conductive paper with different moisture content, has been measured. The data measured are fitted as a function of frequency and moisture content using the amendatory Cole–Cole model utilizing the least square technique. Then, the broadband MTL model of the insulation system of IOCT (Inverted-type Oil-immersed Current Transformer) is established considering the capacitive electrodes thin layer, and the distribution parameters consider the moisture and frequency dependence. A new method for VFTO (Very Fast Transient Overvoltage) distribution calculation of insulation systems is proposed.

Keywords: inverted-type oil-immersed current transformer; insulation system; very fast transient overvoltage; multiconductor transmission line; frequency-domain dielectric spectroscopy (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: 2022
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