Protection system for a three-phase distribution transformer immersed inan insulating fluid
CA 2201770 A1 · Owner: Gec Alsthom T & D Sa · Inventors: De Sedouy, Thomas; Folliot, Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
System for protecting a three-phase distribution transformer immersed in an insulating fluid contained in a reservoir (6). At least two (3 4) of the three phases (3, 4, 5) are fitted on the high-voltage side of the transformer with a current limiting fuse (19, 20). The high-voltage supply is insulated from the reservoir. Each of the phases (3 4) fitted with a current limiting fuse (19 20) is also fitted, in series, with a protective micro-fuse (21 22) which is faster acting than the current limiting fuse and is connected to a striker (23 24). The invention further comprises at least one detector (32 33) for at least one of the following two factors: pressure in the reservoir and the level …
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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 April 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2019.
- 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
Timeline From CIPO dates
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.