Ground fault protective apparatus of field windings
CA 1099782 A · Owner: Tokyo Shibaura Denki Kabushiki Kaisha · Inventors: Nagura, Yukihiro; Toda, Yoshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A resistor a DC source and a current converter are connected in series between one terminal of the field winding and the ground. When a ground fault occurs on the field winding it is detected by the output of a, voltage detector connected across the resistor or the output of the current converter, and an alarm device is operated. At the same time another re-, sistor is connected between the other terminal of the field winding and the current converter through a switch, and the magnitude of the ground fault IS calculated by the outputs of the voltage detector and of the current converter before and after closure of the switch. According to this invention the operation of the generator is …
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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
- Granted April 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 1998.
- 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.