US 12,480,837 B2
Monitoring of a power device
Niklas Gustavsson, Ludvika (SE); Tommy Larsson, Ludvika (SE); Nilanga Abeywickrama, Västerås (SE); and Joachim Schiessling, Enköping (SE)
Assigned to Hitachi Energy Ltd, Zürich (CH)
Appl. No. 18/697,766
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Oct. 5, 2022, PCT No. PCT/EP2022/077701
§ 371(c)(1), (2) Date Apr. 2, 2024,
PCT Pub. No. WO2023/057514, PCT Pub. Date Apr. 13, 2023.
Claims priority of application No. 21201245 (EP), filed on Oct. 6, 2021.
Prior Publication US 2024/0328894 A1, Oct. 3, 2024
Int. Cl. G01M 7/02 (2006.01)
CPC G01M 7/025 (2013.01) 16 Claims
OG exemplary drawing
 
1. A method for monitoring a power device, the method comprising:
obtaining a first frequency spectrum for a first physical component of the power device and a second frequency spectrum for a second physical component of the power device, wherein the first frequency spectrum comprises at least one eigenfrequency of the first physical component and the second frequency spectrum comprises at least one eigenfrequency of the second physical component, and wherein the obtained first frequency spectrum and the obtained second frequency spectrum are obtained prior to assembly of the power device;
measuring, using at least one sensor, a vibroacoustic signal of the power device; and
determining a signal contribution for each of the first physical component and the second physical component of the power device to the vibroacoustic signal based on the obtained first frequency spectrum and the obtained second frequency spectrum.