Analysis of PD phase-resolved images at low frequency of testing voltage

Author

Florkowska, Barbara ; Zydron, Pawel ; Florkowski, Marek

Author_Institution

Dept. of Electr. Power, Univ. of Sci. & Technol., Krakow, Poland

fYear

2004

fDate

19-22 Sept. 2004

Firstpage

143

Lastpage

146

Abstract

Reliable operation of high voltage insulation systems is still one of the main issues of electric power systems, allowing for uninterrupted power delivery. High voltage tests on large capacitance objects like cables are carried out mainly using DC, oscillating or AC voltage at lower frequency, due to required power of supply source. That fact leads to combine simultaneously low frequency test with partial discharge (PD) measurement. However, the verification of diagnostic usefulness of this approach should be confirmed by laboratory investigations. This paper presents influence of testing voltage frequency on registered phase-resolved PD images occurring in high voltage insulation. Both method and specialized measurement system for PD patterns registration in wide frequency range of testing voltage are described. Results of measurements at frequencies from 0.1 Hz up to 50 Hz performed on different objects are presented. Changes of selected discharge parameters and their analysis based on equivalent circuit models are discussed.

Keywords

equivalent circuits; fault location; image registration; insulation testing; partial discharge measurement; power cable insulation; power cable testing; uninterruptible power supplies; 0.1 to 50 Hz; PD measurement; capacitive objectives; diagnostic method; discharge parameter; electric power system; equivalent circuit; high voltage insulation system; image registration; partial discharge measurement; phase-resolved image; power cables; reliable operation; uninterrupted power delivery; Cables; Capacitance; Dielectrics and electrical insulation; Frequency measurement; Image analysis; Partial discharge measurement; Partial discharges; Power system reliability; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2004. Conference Record of the 2004 IEEE International Symposium on

ISSN

1089-084X

Print_ISBN

0-7803-8447-4

Type

conf

DOI

10.1109/ELINSL.2004.1380493

Filename

1380493