公开(公告)号：US20190190254A1

公开(公告)日：2019-06-20

申请号：US16327809

申请日：2016-08-23

Applicant: ABB Schweiz AG

Inventor： Urmil PARIKH ,  Michael STANEK

IPC: H02H9/00 ,  H02H1/00 ,  H02H7/04 ,  H01F27/42 ,  H01H9/56

CPC classification number: H02H9/002 ,  H01F27/42 ,  H01H9/56 ,  H02H1/0092 ,  H02H3/06 ,  H02H7/04

Abstract: In aspects, the present invention provides a method for phase controlled energizing of a power transformer (130). The method comprises acquiring electrical voltage signal from a voltage sensing device (160, 170) connected to the power transformer when a circuit breaker (140) disconnects the power transformer from a power source (110). Determining a first characterizing data in the voltage signal within a pre-determined set of cycles at about an opening operation of the circuit breaker and determining a second characterizing data within the pre-determined set of cycles in the voltage signal subsequent to the opening operation of the circuit breaker. Estimating a level of magnetization of the core of the power transformer based on at least one of second characterizing data, and the first characterizing data and the second characterizing data. Operating the circuit breaker at a determined instant of switching based on the estimated level of magnetization for a phase controlled energizing of the power transformer by the circuit breaker.

公开(公告)号：US20180012711A1

公开(公告)日：2018-01-11

申请号：US15539649

申请日：2015-12-24

Applicant: ABB Schweiz AG

Inventor： Anil TALLURI ,  Anoop PARAPURATH ,  Urmil PARIKH

IPC: H01H9/56 ,  H02H7/26

CPC classification number: H01H9/56 ,  H02H3/06 ,  H02H7/04 ,  H02H7/26 ,  H02H9/002

Abstract: In aspects, the present invention provides a method for controlled energizing of a transformer (150) being connected to a first electrical subsystem (110) through a first circuit breaker (140). The method comprises acquiring electrical current waveform in a first phase of the transformer during a closing operation of the first circuit breaker at an instance for switching determined by a controller (130), determining a first peak (310) in the current in the first phase within a first predetermined time window (Tpw), calculating a first correction factor for adjusting the instance for switching in the first phase, and adjusting the instance for switching based on the calculated first correction factor for performing a next controlled energization at the adjusted instance of switching in the first phase.