Kabushiki Kaisha Toshiba

Hachidai Ito

Minoru Saito

Takashi Nakajima

Junichi Inagaki

Shiro Maruyama

Mitsuru Yamaura

Masao Takahashi

Yoshito Sameda

Itsuo Shuto

Hideaki Sugiura

Noriyoshi Suga

Masamichi Saga

Tatsuji Tanaka

Setsuo Tamura

Masayuki Kosakada

Toshiyuki Saida

Yuuji Minami

Hiromi Nagasaki

Koichi Hamamatsu

Tokuo Ito

The present invention relates to a system for protecting and controlling main-circuit components of an electricity transmission substation. The system includes devices for digital data output, protection-and-controlling, component controlling-and-monitoring, and communication. The digital data output devices input analogue AC electric values and output digital data. The protection-and-controlling devices input the data from the digital data output devices, and further control, monitor, and protect the substation main-circuit components. The component controlling-and-monitoring devices receive commands from the protection-and-controlling devices or from the substation controlling-and-monitoring equipment, and further control and monitor the substation main-circuit components. The devices for digital data output, the protection-and-controlling, and component controlling-and-monitoring are disposed near or within their corresponding substation main-circuit components.

System for protecting and controlling substation main circuit components

A digital protective relay system is capable of making sampling timing the same among plural protective relay device which operate independent from each other by using a signal from a GPS satellite. The sampling timing is made the same regardless of the time lag from which it is sent downstream with the concomitant transmission delay time in the case of data communications, or regardless of the time lag from which it is sent upstream.

Digital protective relay system

In a digital protective relay system for protecting an electric power system, a first digital operation device receives digital data on the electrical quantities of the power system and performs an operation on the digital data to produce an intermediate result, which is then stored in a memory unit. A second digital operation device reads the intermediate result from the memory unit and performs an operation on the intermediate result to produce a final result. The memory unit is so connected as to permit writing by the first operation device only, and to permit reading by the second operation device only.

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Tokyo, Japan

Hachidai Ito