Apparatus and method for detecting and calculating ground fault resistance
CA 2436800 A1 · Owner: Gerritsen, Bruce Allen · Inventors: Sinha, Gautam; Saleh, Mohammed Kassem; Sanderson, Harold Copeland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The field ground fault detector (100, 200 500) of the present invention , detects a ground fault that occurs in the field circuit and in any associated circuits galvanically connected to the field. The field ground fault detector discerns the ground resistance so that it can be monitored to detect gradual degradation of the ground resistance. The detector estimates the resistance of the ground fault and the location of the ground fault. The detector is able to estimate the location of the ground fault during system operation and during periods of non-operation. The invention utilizes a low frequency square wave oscillator (104) to permit measurement of the ground fault resistance …
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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 November 8, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2023.
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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.