公开(公告)号：WO2022029498A8

公开(公告)日：2022-02-10

申请号：PCT/IB2021/000546

申请日：2021-08-05

Applicant: ABB SCHWEIZ AG

Inventor： KENDZIA III, Thomas ,  BOSE, Veerakumar

IPC: H02H3/16 ,  H02H9/08 ,  H02H3/38 ,  H02H3/165 ,  H02H3/167 ,  H02H3/325 ,  H02H3/385

Abstract: Systems, methods, techniques and apparatuses of ground fault protection are disclosed. One exemplary embodiment is a power switch being structured to receive a load current from a power source at a source-side and selectively output the load current from a load-side to a load; a first voltage measuring device structured to measure a first voltage of the source-side while the power switch is conducting the load current; a second voltage measuring device structured to measure a second voltage of the load-side while the first voltage measuring device is measuring the first voltage; and a controller structured to determine a source-side-to-ground voltage based on the first voltage, determine a load-side- to-ground voltage based on the second voltage, determine a ground fault is occurring, and determine a direction of the ground fault relative to the power switch by comparing the source-side-to-ground voltage and the load-side-to-ground voltage.