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Effect of partial discharges on thermal breakdown of oil‐impregnated paper
Author(s) -
Niasar Mohamad Ghaffarian,
Kiiza Respicius Clemence,
Taylor Nathaniel,
Edin Hans
Publication year - 2015
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22159
Subject(s) - multiphysics , dielectric , materials science , partial discharge , stack (abstract data type) , composite material , permittivity , thermal , voltage , high voltage , electrical engineering , analytical chemistry (journal) , finite element method , optoelectronics , thermodynamics , chemistry , engineering , computer science , physics , chromatography , programming language
In this paper, we investigate the effect of partial discharges (PDs) on the thermal breakdown voltage of oil‐impregnated paper (OIP). A disk‐shaped cavity in a stack of paper sheets formed the PD source. The paper sample was exposed to PDs for 18 h. Dielectric spectroscopy measurements were performed on the samples before and after exposure to PD activity. The dielectric spectroscopy results showed a big change in the real and imaginary part of the permittivity. These results were used to calculate the activation energy and heat losses inside the insulation. In order to investigate the possibility of thermal breakdown in the system, the OIP system was simulated by using the FEM software COMSOL Multiphysics. The heat produced by PD pulses and dielectric losses was considered in the simulation. The results show that for the OIP insulation, PD activity can reduce the thermal breakdown voltage by a factor up to 4 times. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.