NDLI: Electrical condition monitoring techniques for low-voltage cables used in nuclear power plants

Content Provider	IEEE Xplore Digital Library
Author	Verardi, L. Fabiani, D. Montanari, G.C. Zak, P.
Copyright Year	2013
Description	Author affiliation: UJV Rez, a.s., Husinec, Czech Republic (Zak, P.) \|\| Dept. of Electr., Electron. & Inf. Eng., Univ. di Bologna, Bologna, Italy (Verardi, L.; Fabiani, D.; Montanari, G.C.)
Abstract	In this paper, dielectric spectroscopy is adapted to investigate the dielectric response, in the frequency range $10^{-2}-10^{6}$ Hz, of a low-voltage cable for nuclear power plants. Cable samples were aged under accelerated stress conditions up to an equivalent aging time of 60 years. The aging procedure consisted of two phases: thermal aging by means of high temperature followed by gamma-irradiation at room temperature. Dielectric spectroscopy has been adapted to measure the dissipation factor Tan(δ) of inner insulation and outer sheath. A significant reduction of Tan(δ) can be observed in the frequency range $10^{1}-10^{4}$ Hz, indicating that accelerated aging process mainly affects the dipolar polarization. Furthermore, the shape of the dielectric response presents a global minimum which shifts to lower frequency as the aging time increases. Experimental results show that the frequency in correspondence of this minimum value, as well as Tan(δ) at the reference frequency of 100 Hz, can be used as aging indicators.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	504
Ending Page	508
File Size	311670
Page Count	5
File Format	PDF
ISBN	9781467347389
e-ISBN	9781467347440
e-ISBN	9781467347396
DOI	10.1109/EIC.2013.6554299
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-02
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cable insulation Dielectrics Materials Accelerated aging Cable shielding
Content Type	Text
Resource Type	Article

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