Patent · US Active

Electrical device and method for determining a phase failure in the electrical device

US8698439B2 · kind B2 · utility

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0References

19Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Dirk Hertz · Fichtenhof, DE
Marco Schönenberg · Amberg, DE
Johann Seitz · Amberg, DE
Stefan Zitzler · Schwandorf, DE

Key dates

Filing date	Nov 17, 2010
Grant date	Apr 15, 2014
Priority date	—
Expiry date	Nov 17, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG01R29/18
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method is disclosed for determining a phase failure in an electrical device for driving or monitoring a three-phase AC motor, wherein the electrical device comprises a first, a second and a third line. In order to detect a phase failure in a line in the three-phase electrical device, in particular in a soft starter, the phase failure in the third line is determined by analysing the first and second lines, wherein the analysis includes: determining a value which characterizes a phase shift between a current in the first and second lines, and outputting a signal if the value which has been determined is in a range of values which characterizes a phase failure in the third line.

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