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. 07, 2004
Filed:
Mar. 04, 2003
Claes Hillberg, Möhlin, CH;
Peter Daehler, Remigen, CH;
ABB Schweiz AG, Baden, CH;
Abstract
A method is specified for operating a transformer ( ) from a drivable voltage source ( ), in which the voltage source, ( ) produces an output voltage (u ) for feeding active power and/or a reactive component via the transformer ( ) into an electrical AC voltage supply network ( ), and an output current (i ) from the voltage source ( ) is monitored for a maximum permissible value (i ) in which the magnetic flux (&phgr;) of the transformer ( ) is determined continuously, and, when the maximum permissible value (i ) of the output current (i ) is exceeded, the voltage source ( ) is disconnected from the transformer ( ). In response to a start signal (S ), an output voltage (u ) is formed as a function of a transformer voltage (u ), which was determined most recently before the maximum permissible value (i ) of the output current (i ) was exceeded, and as a function of a first magnetic flux (&phgr; ), which was determined most recently before the maximum permissible value (i ) of the output current (i ) was exceeded, and of a second magnetic flux (&phgr; ) determined at the time of the start signal (S ), the output voltage (u ) being applied to the transformer ( ) for an adjustable time period (T ) after an adjustable switching time (t ). An apparatus is also specified for carrying out the method.