Circuit for measuring the ground resistance of an ungrounded power circuit
CA 1067580 A · Owner: Siemens Aktiengesellschaft · Inventors: Rumold, Gerhard; Russ, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A measuring circuit for measuring the ground resistance of an ungrounded power circuit, particularly a d-c system supplied from a converter circuit in which a series circuit including an a-c voltage generator, a measuring resistor and a coupling member is connected between the object of the measurement and ground and an evaluation circuit including a phase sensitive rectifier circuit forms the unknown ground resistance by dividing the active component of the current driven by the generator voltage through the series circuit into the voltage between the measurement object and ground.
Read the whole patent
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 December 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 4, 1996.
- 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.