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Hirooka Y.,Otowa Electrical Co.
2011 7th Asia-Pacific International Conference on Lightning, APL2011 | Year: 2011

The automatic breaker re-closing device automatically distinguishes between mull operation of the breaker caused by a lightning surge and operation from an abnormal an overcurrent or a ground fault and automatically re-close only mull breaker operation caused by a lightning surge. © 2011 IEEE. Source


Matsumoto S.,Shibaura Institute of Technology | Sato T.,Tohoku Electric Power Co. | Koga Y.,Otowa Electrical Co. | Yokoyama S.,Japan Central Research Institute of Electric Power Industry
IEEJ Transactions on Power and Energy | Year: 2014

To establish an optimal lightning protection method for power distribution lines, factors such as the mechanism behind lightning surges as well as power distribution network and insulation level of power distribution lines should be taken into consideration. This study experimentally clarifies the voltage-time (V-t) characteristics of currently used 6.6-kV power distribution insulators having higher lightning impulse withstand voltage (LIWV) by considering the differences in polarity and the presence or absence of slurry. Furthermore, in this paper we propose approximation formulas based on the sparkover model for calculating the flashover characteristics of 6.6-kV power distribution insulators, which can contribute to insulation coordination throughout the power distribution system. © 2014 The Institute of Electrical Engineers of Japan. Source


Patent
OTOWA Electrical CO. | Date: 2013-03-28

Provided is a non-linear resistive element which improves the degree of freedom of design of its mounting space. A ceramic sheet


Trademark
OTOWA Electrical CO. | Date: 2006-01-10

Lightning arresters; voltage surge protectors.


Trademark
OTOWA Electrical CO. | Date: 2006-01-10

Lightning arresters; voltage surge protectors.

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