Breakdown characteristics of liquid nitrogen under composite voltages

Author

Sahu, R.K. ; Pradhan, M.K. ; Sarathi, R.

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol., Madras, India

fYear

2005

fDate

16-19 Oct. 2005

Firstpage

349

Lastpage

352

Abstract

In the present work, a carefully designed experimental set up has been used to measure breakdown voltages (BDV) of LN₂ under realistic conditions which are likely to be encountered in the complex electrical systems in the field. Different electrode profiles viz. sphere-sphere, needle-plane has been used to simulate various practical conditions. The Authors particularly focuses on the breakdown characteristics of LN₂ under composite voltages viz. AC superimposed with positive DC, AC superimposed with negative DC. It is observed that DC bias reduces the AC breakdown voltage considerably.

Keywords

electric breakdown; electrodes; nitrogen; voltage measurement; AC superimposed negative DC; AC superimposed positive DC; breakdown characteristic; breakdown voltage measurement; complex electrical system; composite voltage; liquid nitrogen; needle-plane electrode; sphere-sphere electrode; Breakdown voltage; Cryogenics; Dielectrics and electrical insulation; Electrodes; Needles; Nitrogen; Power transformer insulation; Temperature; Testing; Thermal stresses;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2005. CEIDP '05. 2005 Annual Report Conference on

Print_ISBN

0-7803-9257-4

Type

conf

DOI

10.1109/CEIDP.2005.1560693

Filename

1560693