How the three modes of dielectric relaxation are linked to the degradation of insulation materials ?

Hi Youcef

Two instruments were employed to measure complex permittivity of the polymers. The first one is a Novocontrol Spectrometer, which is capable of measurement over frequency range from 1 µHz to 3 GHz. A temperature-controlled sample cell also permits measurements at temperatures from -200 °C to 500 °C. The other one is an Agilent E4980A LCR meter coupled with a 16451 dielectric test fixture, which is available from 20 Hz to 2 MHz at room temperature.

The interfacial polarization, also known as Maxwell-Wagner-Sillars (MWS) relaxation, has been widely observed experimentally. Since the MWS, α- and β-relaxations of the nanocomposite material are merged together, a theoretical function is necessary for separate analysis of the frequency dependence of the three relaxations. Four classical dielectric relaxation functions have been developed and widely applied: Debye, Cole-Cole, Davidson-Cole, and Havriliak-Negami (HN) functions.

Good Luck,

Omar

Gyorgy Banhegyi

Please find attached some links which may prove to be useful

http://www.jeffjournal.org/papers/Volume8/JEFF8-03-16.E.Suljovrujic.pdf

https://www.researchgate.net/publication/267029875_Radiation-induced_modification_of_dielectric_relaxation_spectra_of_polyolefins_Polyethylenes_vs_polypropylene

http://docslide.us/documents/effect-of-ageing-on-the-dielectric-relaxation-of-oriented-and-gamma-irradiated.html

http://ieeexplore.ieee.org/document/506208/

http://ieeexplore.ieee.org/document/1024427/

http://ieeexplore.ieee.org/document/753928/

http://www.ieeeexplore.ws/document/414116/?reload=true

http://cds.cern.ch/record/776482?ln=zh_CN

https://www.researchgate.net/publication/4049849_Comparative_study_of_dielectric_relaxation_spectra_of_electrically_and_thermally_aged_low_density_polyethylene

http://www.univ-tebessa.dz/fichiers/laghouat/179-E0042.pdf

http://link.springer.com/article/10.1007/s00289-014-1279-y

http://search.proquest.com/openview/80a3aa520fb9c8f3f332e4f283b3b25e/1?pq-origsite=gscholar

http://www.freepatentsonline.com/article/Polymer-Engineering-Science/18442943.html

https://www.scribd.com/document/261978695/Conductivity-and-Dielectric-Loss-of-Crosslinked-Polyethylene-Modified-After-Referees-Comments

http://www.aei.tuke.sk/papers/2015/3/03_%20Cimbala.pdf

https://cyberleninka.ru/article/n/relaxations-losses-in-polyethylene-insulation-of-coaxial-cable-structure-during-aging-in-high-humidity-conditions.pdf

Article Radiation-induced modification of dielectric relaxation spec...

Conference Paper Comparative study of dielectric relaxation spectra of electr...

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