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. 04, 1998
Filed:
Oct. 04, 1996
Gerald W Bottrell, La Crescenta, CA (US);
Luke Y Yu, San Marino, CA (US);
Other;
Abstract
A conversion of a three-phase, four-wire power system to divert all zero-sequence current from the power system grounded-neutral source transformer and its phase and neutral conductors. A zero-sequence filter transformer such as a zig-zag transformer is installed, and the system neutral conductor and ground point are relocated from the neutral terminal of the source transformer to that of the zero-sequence filter transformer. A protection scheme operates to trip a main circuit breaker for zero-sequence filter transformer overloads or short circuits. The source transformer and its neutral circuit are thereby protected from the ill effects of zero-sequence currents.