Electrical strength of paper-oil insulation subjected to composite voltages

Author

Mosinski, Franciszek ; Wodzinski, Jerzy ; Sikorski, Lukasz ; Ziencikiewicz, Jozef

Author_Institution

High Voltage Dept., Lodz Tech. Univ., Poland

Volume

1

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

615

Lastpage

623

Abstract

The results of a composite voltage, ac with lightning impulse (LI) tests of a paper-oil insulation model are presented. It was demonstrated that the presence of the background ac voltage leads to a decrease in LI breakdown voltage. This is particularly conspicuous at opposite polarities. The dispersion of LI breakdown voltages decreases save for the case when the LI is superimposed on the opposite polarities. The dispersion of LI breakdown voltages decreases save for the case, when the LI is superimposed on the opposite polarity peak value of the ac sinusoid. In this critical case the combined breakdown voltage (ac+LI) may be even lower than the ac one

Keywords

electric strength; impulse testing; insulating oils; insulation testing; life testing; paper; background ac voltage; breakdown voltages; composite voltages; electrical strength; lightning impulse; opposite polarity peak value; paper-oil insulation; Circuit testing; Control systems; Dielectrics and electrical insulation; Impulse testing; Insulation testing; Lightning; Oscilloscopes; Power transformer insulation; System testing; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.311704

Filename

311704