公开(公告)号：US11500033B2

公开(公告)日：2022-11-15

申请号：US16736353

申请日：2020-01-07

Applicant: ABB Schweiz AG

Inventor： Daniel Aggeler ,  Esa-Kai Paatero ,  Ivan Furlan ,  Nicola Notari ,  Yannick Maret

IPC: G01R31/52 ,  H02J9/06 ,  G01R31/385 ,  G01R31/389

Abstract: The present invention provides a method for detecting a ground fault in a battery of a uninterrupted power supply, the battery includes at least one string with multiple battery cells, the method including the steps of defining multiple individual battery blocks of battery cells along the at least one string, performing an reference impedance measurement for the multiple individual battery blocks at a first point of time, performing a verification impedance measurement for the multiple individual battery blocks at a second point of time, evaluating a change of measured impedance between the reference impedance and the verification impedance for the multiple individual battery blocks of the at least one string, and identifying a ground fault based on a correlated change of measured impedance of the multiple individual battery blocks along the at least one string. The present invention also provides a battery management system for managing a battery of a uninterrupted power supply, which is adapted to perform the above method. The present invention further provides a UPS device and a UPS system, each of which including an above battery management system.