Title :
DC current interruption in HVDC SF6 gas MRTB by means of self-excited oscillation superimposition
Author :
Nakao, Hiroyuki ; Nakagoshi, Yoshihiko ; Hatano, Masayuki ; Koshizuka, Tadashi ; Nishiwaki, Susumu ; Kobayashi, Akio ; Murao, Takeru ; Yanabu, Satoru
Author_Institution :
Kansai Electr. Power Co. Inc., Osaka, Japan
fDate :
10/1/2001 12:00:00 AM
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, a LC circuit was coupled in parallel to a SF 6 gas circuit breaker. Developing a 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 :
HVDC power convertors; HVDC power transmission; SF6 insulation; circuit-breaking arcs; gas blast circuit breakers; substations; 3500 A; DC arc current; DC current interruption; Japan; Kii-Channel HVDC Link; SF6; SF6 metallic return transfer breakers; arc voltage drop gradient; converter station; current interruption; current zero point; metallic return transfer breakers; modified Mayr-type dynamic arc equation; oscillatory current; self-excited oscillatory current; Circuit breakers; Circuit faults; Coupling circuits; Distributed parameter circuits; Equations; HVDC transmission; Power transmission lines; Sulfur hexafluoride; Voltage; Voltage-controlled oscillators;
Journal_Title :
Power Delivery, IEEE Transactions on
