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. 10, 2014
Filed:
Jan. 31, 2011
Tadashi Koshizuka, Saitamashi, JP;
Minoru Saito, Kamakurashi, JP;
Hiroyuki Maehara, Tokyo, JP;
Yoshimasa Sato, Kasawakishi, JP;
Tadashi Koshizuka, Saitamashi, JP;
Minoru Saito, Kamakurashi, JP;
Hiroyuki Maehara, Tokyo, JP;
Yoshimasa Sato, Kasawakishi, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In some embodiments, a method is disclosed that includes measuring a waveform of a power source side voltage of a circuit breaker; measuring a waveform of a transmission line side voltage of the circuit breaker; calculating a waveform of a voltage between contacts of the circuit breaker that is a difference between the waveform of the power source side voltage and the waveform of the transmission line side voltage; calculating a waveform of an absolute value of the waveform of the voltage between contacts; extracting a waveform of a component in a frequency band which is lower than a frequency of the power source and higher than a frequency of a DC component from the waveform of the absolute value; detecting a cycle of the extracted waveform; and closing the circuit breaker based on the cycle.