Title :
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
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;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.831818
