Process and arrangement for recognizing defects in power converters
CA 2114543 A1 · Owner: Siemens Aktiengesellschaft · Inventors: Schmidt, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to detect discharge faults early in converter arrangements (2, 2a), in particular highvoltage direct current transmission systems which could, result in a fire, it is proposed that a signal (S) obtained from the converter arrangement (2 2a) be, subjected to a frequency analysis. A fault signal is generated when a change in the frequency spectrum of the signal (S) caused by a fault is detected. Noncharacteristic harmonic signal components or interharmonic signal components in the frequency spectrum (FS) of the signal (S) are preferably examined here. The frequency analysis may also be performed with the aid of fuzzy logic. FIG 1
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.