Kabushiki Kaisha Toshiba

Tohoku University

Nagoya Institute of Technology

Toshiba Energy Systems & Solutions Corporation

National University Corporation Nagoya Institute of Technology

Shogo Miura

Katsuhiko Sekiguchi

Satoshi Hirano

Daiju Itagaki

Tomoyuki Kawasaki

Takaaki Ohnari

Masayuki Kawamata

According to one embodiment, the A/D conversion unit includes a &#x394;&#x3a3; modulating device which samples the analog electric quantity provided by the electric power system with a predetermined modulation frequency and outputs a bit stream changing over time of single bit obtained by performing &#x394;&#x3a3; modulation, and the digital operation processing unit includes one or more digital filters which inputs the bit stream from the &#x394;&#x3a3; modulating device and of which frequency characteristics differ according to a type of protection control operation, and one or more operation processing elements which perform different kinds of protection control operation processing, based on the bit stream provided by the digital filter.

Control system, transformer, protection control apparatus, and bit stream storage unit

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.

Protection relay device and protection relay method

Growing community of inventors

Tokyo, Japan

Shogo Miura