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:
Sep. 15, 1998
Filed:
May. 31, 1996
Yoshiyuki Hirayama, Ohara, JP;
Nobuhiro Kuroda, Yokohama, JP;
Takaaki Kai, Omiya, JP;
Toshiaki Fujimoto, Omiya, JP;
Haruo Sasaki, Tokorozawa, JP;
Yasutomo Imai, Yono, JP;
Jun Motohashi, Kawasaki, JP;
Hirotoshi Kaneda, Machida, JP;
Kabushiki Kaisha Meidensha, Tokyo, JP;
The Tokyo Electric Power Company, Tokyo, JP;
Abstract
A method for detecting islanding operation of a rotating-machine type dispersed generator. The dispersed generator is interconnected with a main electric source through a circuit breaker to constitute an electric power system. The estimating method is implemented as follows: (a) changing electric power of the electric power system; (b) detecting frequency component of the electric power; and (c) deciding that an islanding operation of the dispersed generator is executed if the change of the frequency component becomes greater than a predetermined value. With this method, it becomes possible to detect the islanding operation of the dispersed generator even if the power flow at the interconnecting circuit breaker is generally zero.