公开(公告)号：US10309995B2

公开(公告)日：2019-06-04

申请号：US15766718

申请日：2016-10-05

Applicant: ABB Schweiz AG

Inventor： Nilanga Abeywickrama ,  Robert Saers ,  Tord Bengtsson ,  Jonas Hedberg

IPC: G01R23/167 ,  G06F17/14 ,  H02H1/00 ,  G01R19/25

Abstract: A method of determining phasor components of a periodic waveform, wherein the method includes: a) sampling the periodic waveform, b) determining a frequency spectrum of the sampled periodic waveform by means of a frequency transform utilizing a Gaussian window function, wherein a ratio np defined by the duration of the sampling of the periodic waveform divided by the width parameter of the Gaussian window function is at least 5, c) selecting a region of the frequency spectrum containing a frequency peak defined by a group of consecutive frequency bins each being defined by a frequency value and a magnitude value, and d) determining phasor components of the periodic waveform based on the group of consecutive frequency bins.

公开(公告)号：US20180321290A1

公开(公告)日：2018-11-08

申请号：US15766718

申请日：2016-10-05

Applicant: ABB Schweiz AG

Inventor： Nilanga Abeywickrama ,  Robert Saers ,  Tord Bengtsson ,  Jonas Hedberg

IPC: G01R23/167 ,  H02H1/00 ,  G01R19/25 ,  G06F17/14

CPC classification number: G01R23/167 ,  G01R19/2506 ,  G01R19/2513 ,  G06F17/142 ,  H02H1/0092

Abstract: A method of determining phasor components of a periodic waveform, wherein the method includes: a) sampling the periodic waveform, b) determining a frequency spectrum of the sampled periodic waveform by means of a frequency transform utilizing a Gaussian window function, wherein a ratio np defined by the duration of the sampling of the periodic waveform divided by the width parameter of the Gaussian window function is at least 5, c) selecting a region of the frequency spectrum containing a frequency peak defined by a group of consecutive frequency bins each being defined by a frequency value and a magnitude value, and d) determining phasor components of the periodic waveform based on the group of consecutive frequency bins.

公开(公告)号：US10809289B2

公开(公告)日：2020-10-20

申请号：US16489519

申请日：2018-02-21

Applicant: ABB Schweiz AG

Inventor： Nilanga Abeywickrama ,  Tord Bengtsson ,  Jonas Hedberg

IPC: G01R27/26 ,  G01R31/62 ,  H01F27/40

Abstract: A method of determining the capacitance and loss-factor of each of a plurality of capacitive components of an electrical power device, wherein the method includes: a) obtaining for each capacitive component a respective capacitance value and loss-factor value, and b) processing the capacitance values and the loss-factor values, wherein the processing involves removing a common influence of temperature on the capacitance values from the capacitance values and removing a common influence of temperature on the loss-factor values from the loss-factor values to obtain for each capacitive component a temperature-compensated capacitance value and a temperature-compensated loss-factor value.