Kabushiki Kaisha Toshiba

Hideyuki Takani

Katsuhiko Sekiguchi

Hideaki Sugiura

Yasuhiro Kurosawa

Hidenari Amo

The present invention provides a wide area protection control measurement system and method which excels in economy, reliability and expandability, in which applied arithmetic operation functions for protection, control and measurement can be freely added and changed, without adding or changing power monitoring terminals to be installed in the electric-supply station. The wide area protection control measurement system is configured from N number of power monitoring terminalsinstalled in an electric-supply station in a target range, one electric quantity aggregation deviceconnected with these power monitoring terminalsvia a communication network, and M number of applied arithmetic operation devicesconnected with the electric aggregation devicethrough an inter-device connection. Each power monitoring terminaltransmits electric quantity data to the electric quantity aggregation devicevia the communication network. The electric quantity aggregation deviceaggregates received electric quantity data to generate aggregated electric quantity data and outputs it to each applied arithmetic operation devices. Each applied arithmetic operation devicesperforms applied arithmetic operation for protection, control or management, using the aggregated electric quantity data acquired from the electric quantity aggregation device

Wide area protection control measurement system and method

A protection relay for determining whether or not a fault point of a power system exists in a predetermined range including a filter section for inputting sampling data of a voltage and a current in the power system to a digital filter having a predetermined transfer function and outputting a first voltage data and a first current data, and a second voltage data and a second current data normal to the first voltage data and the first current data, respectively, a calculator for calculating a predetermined measurement value based on the first and second voltage data, and the first and second current data at a first time and the first and second voltage data, and the first and second current data at a second time different from the first time, and an operation decision section for performing an operation decision based on the predetermined measurement value obtained by the calculator.

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Kawagoe, Japan

Hideyuki Takani