Kabushiki Kaisha Toshiba

Tohoku University

Takaaki Ohnari

Katsuhiko Sekiguchi

Shogo Miura

Tomoyuki Kawasaki

Masayuki Kawamata

A protection relay device includes: an analog-to-digital converter that samples an analog signal inputted from an analog input unit and converts the analog signal into digital data; a variable filter that filters and outputs the digital data, the variable filter having a filter coefficient that is varied by external control; and an adaptive controller that variably controls the filter coefficient of the variable filter so that a difference between the digital data filtered by the variable filter and a target signal decreases.

Growing community of inventors

Fuchu, Japan

Takaaki Ohnari