Method for determining asymmetric vibrations in an electric device

Patent metadata

Field	Value
Publication number	US-12019102-B2
Application number	US-202017613177-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	May 20, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A method for determining a direct current component in an electric device that is connected to a high-voltage supply network. The method includes the following steps: acquiring operating noises of the electric device with the aid of acoustic sensors that are part of a portable unit and that provide acoustic signals at the output; breaking the acoustic signals down into their frequency components by a Fourier transformation, yielding a frequency spectrum; determining odd and even frequency components of the frequency spectrum in dependence upon a basic frequency of the high-voltage supply network and setting them in a ratio to one another; concluding that a direct current component is present if the ratio exceeds a predefined threshold value.

First claim

The invention claimed is:

1. A method for identifying a DC current component in an electrical device that is connected to a high-voltage supply grid, the method comprising:
providing a portable unit with at least one acoustic sensor;
acquiring acoustic signals at different locations in a vicinity of the electrical device with the at least one acoustic sensor, wherein a software interactively guides a user during the acquiring step and wherein the acoustic signals capture operating noise of the electrical device;
breaking down the acoustic signals into frequency components by way of a Fourier transformation to obtain a frequency spectrum;
ascertaining even and odd frequency components of the frequency spectrum based on a fundamental frequency of the high-voltage supply grid and determining a ratio R between the odd and even frequency components; and
when the ratio R exceeds a predetermined threshold value, concluding that a DC current component is present in the electrical device.

2. The method according to claim 1 , wherein the portable unit is a mobile telephone.

3. The method according to claim 2 , wherein the mobile telephone has a storage unit, and the method further comprises storing the acoustic signals or the frequency spectrum in the storage unit.

4. The method according to claim 1 , which comprises performing the entire method on a mobile telephone.

5. The method according to claim 1 , which comprises acquiring the acoustic signals over a predefined duration.

6. The method according to claim 1 , wherein the portable unit is configured for connection to a cloud via a long-range communication connection.

Assignees

• Siemens Energy Global Gmbh & Co Kg

Inventors

• Herterich Holger
• Klammler Franz
• Kutzner Ruediger
• Mayer Harald
• Scala Mario
• Weber Marc

Classifications

• H04W4/38

  for collecting sensor information · CPC title

• G01R19/0015 Primary

  separating AC and DC · CPC title

• Y02E40/40

  Arrangements for reducing harmonics · CPC title

• H02J3/01 Primary

  Arrangements for reducing harmonics or ripples · CPC title