The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2009
Filed:
Mar. 16, 2004
Ken Yanagihashi, Tokyo, JP;
Mamoru Suzuki, Tokyo, JP;
Takafumi Maeda, Tokyo, JP;
Akira Ishibashi, Tokyo, JP;
Yasuchika Nishitani, Tokyo, JP;
Ken Yanagihashi, Tokyo, JP;
Mamoru Suzuki, Tokyo, JP;
Takafumi Maeda, Tokyo, JP;
Akira Ishibashi, Tokyo, JP;
Yasuchika Nishitani, Tokyo, JP;
The Tokyo Electric Power Company, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A power system protection system prevents a voltage drop resulting from the reactive power characteristic of a power system. A main device for acquiring a system electric quantity of one or a plurality of upper substations detects a voltage drop resulting from the reactive power characteristic of the power system and transmits a detection signal of the voltage drop to a terminal device for acquiring a system electric quantity of one or a plurality of lower substations. Each terminal device sequentially sheds loads starting from those suffering more from the influence of the voltage drop resulting from the reactive power characteristic based on the load voltage and load current of a load bus.