Patent · US Expired

Three- or four-pole low-voltage power switch with Rogowski coils operating as current sensors

US7309993B2 · kind B2 · utility

17Cited by

2References

2Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Thomas Driehorn · Berlin, DE
Andreas Krauss · Lörrach, DE
Andreas Pancke · Berlin, DE
Ilka Redmann · Falkensee, DE
Wolfgang Rohl · Berlin, DE

Key dates

Filing date	Mar 2, 2005
Grant date	Dec 18, 2007
Priority date	—
Expiry date	Mar 2, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH02H1/0007
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A three or four pole low-voltage power switch is disclosed wherein the switch is partly provided with a device for detecting ground faults. For this purpose, the current vectorial sum must be produced in the three or four conductors of a monitored network. For the switches of this type, output signals received from Rogowski coils are directed via resistances to an integration capacitor whose voltage forms an input signal of another measuring amplifier representing the current sum of a monitored network. The output signal of the measuring amplifier is, afterwards processed in a known manner in the microprocessor of an excess-current trip.

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