A study of voltage withstand of various gases under AC voltage

Author

Tiamkatok, W. ; Chotigo, Supakit

Author_Institution

Dept. of Electr. Eng., King Mongkut´s Univ. of Technol. Thonburi, Bangkok, Thailand

fYear

2011

fDate

6-10 Sept. 2011

Firstpage

425

Lastpage

428

Abstract

At present, equipments in Gas Insulated Substation(GIS) such as circuit breaker, ground switch, busbar and transformer use SF₆ as its insulation because of its better electrical withstand, less area for installation and arc quenching for circuit breaker. However, SF₆ has high cost. Furthermore, it causes green house effect and poisonous environment. In this research, the voltage withstand of Ar, He, O₂, CO₂, Air, and N₂ was studied to compare with that of SF₆. The voltage withstand of each gas under 50 Hz AC voltage was studied using a chamber designed following ASTM D 2477-96 which consists of rod-plane and sphere-plane gap made of stainless steel. Gap distances in this experiment were 5, 10, 15 and 20 mm while the gas pressures were varied to 1, 2 and 3 bars. The results show that He has the lowest voltage withstand compared to other gases at the same gap distance and pressure.

Keywords

SF₆ insulation; argon; carbon compounds; electric breakdown; electric strength; gas insulated substations; helium; nitrogen; oxygen; AC voltage; ASTM D 2477-96 chamber; Ar; CO₂; He; N₂; O₂; SF₆; busbar; circuit breaker; frequency 50 Hz; gas insulated substation; gas pressures; ground switch; pressure 1 bar to 3 bar; rod-plane gap; sphere-plane gap; stainless steel; transformer; voltage withstand; Circuit breakers; Conference proceedings; Electrodes; Gases; Power transformer insulation; Sulfur hexafluoride; Breakdown voltage; Characteristic; Dielectric Strengths; Gases; Insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials (ISEIM), Proceedings of 2011 International Conference on

Conference_Location

Kyoto

Print_ISBN

978-4-88686-074-3

Type

conf

DOI

10.1109/ISEIM.2011.6826360

Filename

6826360