Patent · US Active

Protective device and method for its operation

US8243409B2 · kind B2 · utility

0Cited by

3References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Bardo Koppmann · Feldkirchen-Westerham, DE
Siegfried Neumann · Amberg, DE
Ludwig Niebler · Hemau, DE
Bernhard Streich · Amberg, DE
Alf Wabner · Amberg, DE
Norbert Zimmermann · Sulzbach-Rosenberg, DE

Key dates

Filing date	Feb 7, 2007
Grant date	Aug 14, 2012
Priority date	—
Expiry date	Nov 22, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH01H71/125
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A protective device is disclosed for combination with an electrical switching device including a main current line or for integration in such a switching device. In at least one embodiment, the protective device includes a switching element and a switching apparatus, which is provided for the actuation of the switching element and is influenced by a current flow through the main current line. In at least one embodiment, in order to influence the switching apparatus, a current transformer is integrated in the main current line and an electrical resistance of a secondary winding surrounded by the current transformer can be measured. A method for operating a protective device is also disclosed wherein the switching apparatus is triggered so as to actuate the switching element if the measured resistance reaches or exceeds a predetermined or predeterminable threshold value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.