Company Filing History:
Years Active: 1981-1983
Title: Mizuho Yamashita: Innovator in Lightning Protection Technology
Introduction
Mizuho Yamashita is a prominent inventor based in Yokohama, Japan. She has made significant contributions to the field of lightning protection technology, holding two patents that showcase her innovative spirit and technical expertise.
Latest Patents
Yamashita's latest patents include a lightning arrester and an apparatus for detecting degradation of characteristics of arresters. The lightning arrester features at least two stacks of non-linear resistors connected in series, along with an arcing gap device designed to shunt one stack of resistors when the gap means sparks over. This device is housed in a hermetically sealed enclosure filled with sulfur hexafluoride gas, maintaining a gauge pressure of not less than 2 kg/cm². The impedance of one resistor stack is designed to be between 15% and 35% of the total impedance when the arcing gap sparks over, with a rated voltage of not less than 50 KV.
The second patent, an apparatus for detecting degradation of characteristics of arresters, includes a characteristic element made up of a stack of metal oxide resistors. A parallelly connected capacitor and a linear resistor are linked between the characteristic element and ground. The voltage drop across the linear resistor is utilized to light a neon lamp or operate an alarm device to detect deterioration of the characteristic element. To protect the capacitor and linear resistor during operation, a nonlinear resistor may be connected in parallel.
Career Highlights
Yamashita is currently employed at Tokyo Shibaura Denki Kabushiki Kaisha, where she continues to develop innovative solutions in electrical engineering. Her work has significantly advanced the safety and reliability of electrical systems.
Collaborations
Throughout her career, Mizuho Yamashita has collaborated with notable colleagues, including Shigeru Takahashi and Iwao Ohshima. These partnerships have fostered a creative environment that encourages the development of groundbreaking technologies.
Conclusion
Mizuho Yamashita's contributions to lightning protection technology exemplify her dedication to innovation and safety in electrical engineering. Her patents reflect a deep understanding of the complexities involved in protecting electrical systems from lightning strikes.
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