公开(公告)号：US20240331958A1

公开(公告)日：2024-10-03

申请号：US18440540

申请日：2024-02-13

Applicant: ABB Schweiz AG

Inventor： Elisabeth Lindell ,  Stefan Halen

IPC: H01H9/56 ,  H01H33/59

CPC classification number: H01H9/56 ,  H01H33/59 ,  H01H2009/566

Abstract: A method of performing a circuit opening and closing operation in a power system including three phases, a three-phase transformer, and a circuit breaker system, the method including a) opening all three phases simultaneously such that a reference current of a reference phase is interrupted first at a first current zero crossing after the opening; and b) closing all three phases simultaneously at a phase to ground voltage of the phase lagging the reference phase by 120°, in a time range of ±90° from a negative peak of said phase to ground voltage if the current zero crossing is a positive current zero crossing, or in a time range of ±90° from a positive peak of said phase to ground voltage if the current zero crossing is a negative current zero crossing.

公开(公告)号：US20240329606A1

公开(公告)日：2024-10-03

申请号：US18588555

申请日：2024-02-27

Applicant: ABB Schweiz AG

Inventor： Elisabeth Lindell ,  Stefan Halen

IPC: G05B11/36

CPC classification number: G05B11/36

Abstract: A method of performing a circuit opening and closing operation in a power system having a first phase, a second phase), and a third phase, the method including a) opening only a reference phase among the first phase, the second phase and the third phase such that a reference current of the reference phase is interrupted at a first current zero crossing after the opening; b) opening the remaining phases after step a); c) closing only the reference phase and a phase lagging the reference phase by 120° simultaneously or essentially simultaneously at a closing phase angle of a phase to ground voltage of the reference phase of 320°±70° when the current zero crossing is a positive current zero crossing, or of 140°±70° when the current zero crossing is a negative current zero crossing; and d) closing the phase lagging the reference phase by 240° after step c).