Open AccessStudy of the Dielectric Properties of Condenser Material Used in SF6 Insulated RIP Bushing
Author(s) -
Shiling Zhang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/733/1/012013
Subject(s) - bushing , dielectric , arrhenius equation , atmospheric temperature range , relaxation (psychology) , materials science , condenser (optics) , range (aeronautics) , cole–cole equation , thermodynamics , thermal conduction , conductivity , analytical chemistry (journal) , composite material , chemistry , physics , optics , activation energy , optoelectronics , psychology , social psychology , light source , organic chemistry , chromatography
All In the frequency range of 10 −1 ∼10 6 Hz and the temperature range of -100∼200°C, the experimental dielectric spectrum of the condenser material used in UHVDC RIP bushing has been measured by Novocontrol broadband dielectric spectroscopy. The measured data has been fitted applied to nonlinear numerical calculation of the Havriliak-Negami (HN) equation, by which the characteristic parameters of HN mathematical model have been got. The studies show that the genetic algorithm combining with the least-square curve fitting method can ensure the uniqueness and accuracy of the fitting parameters. In the frequency range of 10 −1 ∼10 6 Hz and the temperature range of -40∼60°C, β relaxation process mainly takes place in the condenser material. In temperature range of 70∼150°C, α and β relaxation processes can be observed. In the temperature range of 160∼200°C, the α relaxation and DC conduction processes are obvious. The DC conductivity and relaxation time have significant temperature dependence which can be fitted well with Arrhenius equation.