US 12,078,669 B2
Method for detecting an electrical discharge in an electrical apparatus and system therefor
Kai Hencken, Lörrach (DE); Holger Kaul, Mannheim (DE); Jörg Gebhardt, Mainz (DE); Yannick Maret, Dättwil (CH); and Andrej Krivda, Wettingen (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Jun. 30, 2023, as Appl. No. 18/345,009.
Application 18/345,009 is a division of application No. 17/380,313, filed on Jul. 20, 2021, granted, now 11,726,131.
Claims priority of application No. 20186742 (EP), filed on Jul. 20, 2020.
Prior Publication US 2023/0341453 A1, Oct. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/327 (2006.01); G01R 31/12 (2020.01); G01S 11/16 (2006.01)
CPC G01R 31/1209 (2013.01) [G01R 31/3271 (2013.01); G01S 11/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for detecting an electrical discharge in an electrical apparatus, comprising:
sensing an acoustic wave and an electromagnetic wave using a first sensing device and generating a first combined signal, wherein the first combined signal is a single signal including a component corresponding to the acoustic wave and a component corresponding to the electromagnetic wave; and
processing the first combined signal to determine the occurrence and/or properties of an electrical discharge, wherein the processing comprises:
generating a first electromagnetic signal from a component of the first combined signal corresponding to the electromagnetic wave;
generating a first acoustic signal from a component of the first combined signal corresponding to the acoustic wave; and
categorizing the electrical discharge based on the first electromagnetic signal and the first acoustic signal to determine whether the electrical discharge corresponds to an internal partial discharge, a surface partial discharge, or an external disturbance.