Diagnostic of water trees using DC and AC voltages

Author

Romero, Pedro ; Puerta, Julio

Author_Institution

INTEVEP SA, Caracas, Venezuela

Volume

1

fYear

1996

fDate

16-19 Jun 1996

Firstpage

159

Abstract

Electric tools for nondestructive water tree diagnostics in XLPE medium voltage power cables, by means of DC and AC voltages, are presented. The DC method is related to the determination of a nonlinear dependence of the polarization current on the applied DC step voltage, in contrast to a linear dependence found in nonwater tree-damaged cables. In both cases, the current follows the Curie-von Schweidler empirical law. The AC method is based on the measurement of the dispersion relation of both the loss factor and the capacitance in the low and very low frequency ranges by means of Fourier transform techniques. The devised measuring instrumentation is also presented

Keywords

XLPE insulation; electric breakdown; insulation testing; nondestructive testing; power cable insulation; power cable testing; trees (electrical); AC method; Curie-von Schweidler empirical law; DC method; Fourier transform techniques; XLPE MV power cables; applied DC step voltage; capacitance; dispersion relation; loss factor; measuring instrumentation; nondestructive water tree diagnostics; polarization current; Capacitance measurement; Dispersion; Fourier transforms; Frequency measurement; Instruments; Loss measurement; Medium voltage; Polarization; Power cables; Trees - insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on

Conference_Location

Montreal, Que.

ISSN

1089-084X

Print_ISBN

0-7803-3531-7

Type

conf

DOI

10.1109/ELINSL.1996.549307

Filename

549307