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:
Jun. 04, 1996
Filed:
Mar. 22, 1994
Yasuhiro Kurosawa, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A frequency detecting method for detecting a frequency of an AC electric parameter of an electric power system. The frequency detecting method comprises a sampling step of sampling the AC electric parameter of the electric power system at a predetermined sampling period, an adding step of adding a sampling value v.sub.m sampled at a sampling time m and a sampling value v.sub.m-n sampled at a sampling time (m-n), thereby obtaining a sum w.sub.m of the sampling values, a first RMS value calculating step of calculating a first electric parameter E1 corresponding to a RMS value of the sum w.sub.m, a second RMS value calculating step of calculating a second electric parameter E2 corresponding to a RMS value of a time-differential value u.sub.m of the sum w.sub.m, a dividing step of dividing the second electric parameter E2 by the first electric parameter E1, and a frequency detecting step of detecting the frequency of the AC electric parameter from a division result (E2/E1).