This paper presents some preliminary test results of electrical property measurements on XLPE insulations used at NPPs. These cables were aged under thermal and radiation stresses: in order to obtain significant results in a reasonable time, the dose rate and the temperature chosen were higher than the values usually found inside NPPs. Electrical measurements have been performed through dielectric spectroscopy and polarization/depolarization current. First results show significant variations of the electrical properties of aged cables that can be correlated to insulation aging. In particular, the real part of the permittivity increases noticeably with aging along the entire frequency range and the imaginary part of the permittivity shows polarization peaks at the lower frequency considered for the analysis.
Electrical Aging Markers for Low-Voltage Cable Insulation Wiring Nuclear Power Plants / L. Verardi; D. Fabiani; G. C. Montanari; V. Placek. - ELETTRONICO. - (2012), pp. 6318966.1-6318966.4. (Intervento presentato al convegno 2012 IEEE Int. Conference on Properties and Application of Dielectric Materials (ICPADM) tenutosi a Bangalore, India nel July 2012).
Electrical Aging Markers for Low-Voltage Cable Insulation Wiring Nuclear Power Plants
FABIANI, DAVIDE;MONTANARI, GIAN CARLO;
2012
Abstract
This paper presents some preliminary test results of electrical property measurements on XLPE insulations used at NPPs. These cables were aged under thermal and radiation stresses: in order to obtain significant results in a reasonable time, the dose rate and the temperature chosen were higher than the values usually found inside NPPs. Electrical measurements have been performed through dielectric spectroscopy and polarization/depolarization current. First results show significant variations of the electrical properties of aged cables that can be correlated to insulation aging. In particular, the real part of the permittivity increases noticeably with aging along the entire frequency range and the imaginary part of the permittivity shows polarization peaks at the lower frequency considered for the analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
