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Time and space transition characteristics of DC electric field stress in oil‐pressboard composite insulation systems
Author(s) -
Nakane Ryuichi,
Kato Katsumi,
Hayakawa Naoki,
Okubo Hitoshi
Publication year - 2020
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.12243
Subject(s) - pressboard , electric field , space charge , materials science , insulation system , stress (linguistics) , transformer , composite number , electrical engineering , condensed matter physics , voltage , composite material , physics , engineering , linguistics , philosophy , quantum mechanics , electron
Abstract In AC/DC converter transformers under DC application, the electric field distributions are distorted due to the accumulated charge on pressboard. However, the time‐dependent characteristics of DC electric field stress in oil has not yet been clarified in detail. In this paper, we investigated the time and electric field space transition characteristics of DC electric field distributions in oil‐pressboard composite insulation systems. As a result, we quantitatively clarified that DC electric field stress strongly depends on the elapsed time and the location in the electric field space in oil. In particular, it was found that the most severe electric field stress in oil may emerge during the time transition process.