Company Filing History:
Years Active: 1980-1998
Title: Innovations by Yoshihito Asai
Introduction
Yoshihito Asai is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of circuit breakers. With a total of 7 patents to his name, Asai's work has had a substantial impact on the efficiency and safety of electrical power transmission systems.
Latest Patents
One of Asai's latest patents is a method of controlling transient recovery voltage and gas insulation. This innovation addresses the steep initial rate of rise of the transient recovery voltage across the poles of a circuit breaker immediately after a fault current break. By utilizing a saturable reactor with a capacitor connected in parallel, the breaking performance during short-circuit faults is significantly improved. The self-inductance of the saturable reactor increases gradually, producing an LC resonance that allows for better control of the current flowing from the reactor, thus managing the initial rate of rise of the transient recovery voltage.
Another notable patent is the puffer type gas circuit breaker. This design includes a guide section at the coupler between the puffer cylinder and the dielectric operating rod. This guide helps to maintain alignment between movable and fixed components, ensuring a constant gap between the dielectric nozzle and the fixed arc contact. Such an arrangement guarantees uniformity in the gap, even with increased pole-to-pole distances, thereby providing stable insulation characteristics during current interruption operations.
Career Highlights
Yoshihito Asai is associated with Hitachi, Ltd., a leading company in the field of technology and engineering. His work has been instrumental in advancing the capabilities of circuit breakers, making them safer and more efficient for use in electrical power systems.
Collaborations
Asai has collaborated with notable colleagues such as Osamu Koyanagi and Yukio Kurosawa. Their combined expertise has contributed to the successful development of innovative technologies in the electrical engineering sector.
Conclusion
Yoshihito Asai's contributions to electrical engineering through his patents and innovations have significantly enhanced the performance and safety of circuit breakers. His work continues to influence the industry and pave the way for future advancements.