DC Current Interruption in HVDC SF6 Gas MRTB by Means of Self-Excitation

Author

Nakao, Hayato ; Nakagoshi, Y. ; Hatano, M. ; Koshizuka, T. ; Nishiwaki, Shiro ; Kobayashi, Akihiro ; Murao, Toshiyuki ; Yanabu, Satoru

Author_Institution

The Kansai Electric Power Co. Inc.; Shikoku Electric Power Co.; Toshiba Corporation, Japan

Volume

21

Issue

8

fYear

2001

Firstpage

62

Lastpage

62

Abstract

The Kii-Channel HVDC link under construction in Japan is equipped with metallic return transfer breakers (MRTBs) in one converter station. A new MRTB for an interrupting current of 3500 A dc was developed. To interrupt a dc current, a method that produces a current zero point by superimposing a self-excited oscillatory current on a dc arc current was employed. For this purpose, an LC circuit was coupled in parallel to an SF6 gas circuit breaker. Developing an SF6 gas circuit breaker that has a large arc voltage drop gradient against currents permitted a large oscillatory current to be generated. A modified Mayr-type dynamic arc equation was newly presented. The dc interruption limits calculated using this equation agreed with the measured values.

Keywords

Circuit breakers; Equations; HVDC transmission; Load flow; Load flow control; Power electronics; Power system harmonics; Power system modeling; Sulfur hexafluoride; Voltage control; HVDC transmission; MRTB; Mayr-type dynamic arc equation; SF6 gas circuit breaker; arc voltage; dc circuit breaker; self-excited oscillation;

fLanguage

English

Journal_Title

Power Engineering Review, IEEE

Publisher

ieee

ISSN

0272-1724

Type

jour

DOI

10.1109/MPER.2001.4311571

Filename

4311571