Kabushiki Kaisha Toshiba

Michihiko Inukai

Takahiro Mori

Kazuo Watabe

Osamu Nishimura

Yutaka Saita

Masao Hori

Tomonori Nishida

Hideaki Sugiura

Keiichiro Someda

Akira Kawarada

According to one embodiment, a method is used for diagnosing a deterioration of a utility pole having at least one bolt and a plurality of holes provided for attaching the bolt. In the method, an impact is applied to the bolt. Elastic waves generated due to the impact are detected by a sensor shaped like a bolt. The sensor is attached to at least one of the holes. A propagation situation of the elastic waves in the utility pole is derived, based on the elastic waves detected, and each position of the bolt and the sensor.

Deterioration diagnosis method, a deterioration diagnosis system, and a sensor

A protective relay system includes plural protective relay devices protecting a power system based on electrical quantity data from the power system, and a communication between the protective power devices is performed via a network. The protective relay device includes a clock unit periodically clocking a timing at which sampling is performed on an electrical quantity of the power system, a relay computing unit performing a relay computation based on the electrical quantity data having undergone the sampling and electrical quantity data received via the network, a random-number creating unit creating a random number, and a synchronization-frame processing unit setting a timing of sending a synchronization frame to another protective relay device via the network based on the random number created by the random-number creating unit.

Protective relay system and protective relay device

Growing community of inventors

Kanagawa, Japan

Michihiko Inukai