Polarization behaviour of cross-linked polyethylene (XLPE)

Author

Sanzi, P. ; Monti, F. ; Montanari, G.C. ; Das-Gupta, D.K.

Author_Institution

Dipt. di Ingegneria Elettrica, Bologna Univ., Italy

fYear

1999

fDate

1999

Firstpage

47

Lastpage

50

Abstract

Cross-linked polyethylene (XLPE) has low dieletric permittivity, loss factor, good dimensional stability and solvent resistance. Because of these inherent and desirable properties XLPE cables are extensively used in power distribution applications. Dielectric properties of polymers may change irreversibly with continued electric stress because of injection of electrical charges and their subsequent localisation. As a result the polymer may suffer electrical degradation and studies of dielectric relaxation behaviour over a wide frequency range and determination of polarisation distribution by laser intensity modulation method (LIMM) are useful to detect ageing. The present work reports the results of a study of the polarisation behaviour in unaged, heat treated and DC aged XLPE by (i) the dielectric spectroscopy in the frequency range of 10^-5 to 10⁶ and (ii) LIMM. Moreover, space charge investigation by pulse electroacoustic (PEA) method is also carried out

Keywords

XLPE insulation; acoustoelectric effects; dielectric polarisation; dielectric relaxation; permittivity; space charge; 1E-5 to 1E6 Hz; cross-linked polyethylene; dielectric relaxation; dielectric spectroscopy; electrical degradation; good dimensional stability; laser intensity modulation method; loss factor; low dieletric permittivity; polarization behaviour; pulse electroacoustic method; solvent resistance; space charge; Aging; Dielectrics; Electric resistance; Frequency; Permittivity; Polarization; Polyethylene; Polymers; Solvents; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on

Conference_Location

Athens

Print_ISBN

0-7803-5025-1

Type

conf

DOI

10.1109/ISE.1999.831818

Filename

831818