Patent · US Expired

Protective device, in particular a fault current protective device

US6650523B1 · kind B1 · utility

8Cited by

2References

21Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Manfred Kleemeier · Neutraubling, DE
Gerald J. Lehner · Obertraubling, DE
Reinhard Schmid · Regensburg, DE

Key dates

Filing date	Feb 25, 2002
Grant date	Nov 18, 2003
Priority date	—
Expiry date	Apr 18, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH02H3/33
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Two detection systems are provided for a protective device, in particular an FI protective device, having a core balance transformer whose secondary winding is followed by a tripping relay for operating a switching mechanism, which switches a conductor network. In this case, a first detection system carries out the tripping function for fault currents at a fault current frequency below a changeover frequency. The second detection system carries out the tripping function for fault currents above the changeover frequency. The changeover frequency is in this case preferably not less than 1 kHz.

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