Patent · US Active

Frequency converter and method for identifying and blocking a fault current in a frequency converter

US9007790B2 · kind B2 · utility

4Cited by

15References

7Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Reinhold Dillig · Memmelsdorf, DE
Bernd Herrmann · Ehningen, DE
Hubert Schierling · Erlangen, DE
Benno Weis · Hemhofen, DE

Key dates

Filing date	Sep 6, 2012
Grant date	Apr 14, 2015
Priority date	—
Expiry date	Apr 1, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH02M1/32
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In a frequency converter operated for safety of personnel and/or fire protection via a ground fault interrupter is frequently not able to distinguish between an actual fault current and an operationally generated leakage current. The proposed method addresses this problem by determining a course of a magnitude of a current flowing through the frequency converter, predefining a signal portion which is independent of switching processes within the frequency converter while the frequency converter operates fault-free, checking whether the determined course satisfies a criterion that is predetermined depending on the signal portion, and interrupting the current the determined course fails to satisfy the predetermined criterion.

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