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公开(公告)号：US10416209B2
公开(公告)日：2019-09-17
申请号：US16075858
申请日：2017-02-13
Applicant: ABB Schweiz AG
Inventor： Nilanga Abeywickrama , Svante Karlsson , Tord Bengtsson
IPC: G01R21/133 , G01R19/25 , G01R31/02 , G01R29/20
Abstract: A system and a method for determining the power loss of a transformer. The method includes measuring voltage and current at the primary side of the transformer, calculating input power by multiplying the measured current and voltage on the primary side of the transformer; measuring voltage and current at the secondary side of the transformer, calculate a nominal error ratio, calculating output power by multiplying the measured current and voltage on the secondary side of the transformer. The method further involves calculating a first corrected power loss by means of multiplying the input power with the nominal error ratio and subtract the output power.
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公开(公告)号：US10473707B2
公开(公告)日：2019-11-12
申请号：US16328482
申请日：2017-08-25
Applicant: ABB Schweiz AG
Inventor： Tord Bengtsson , Nilanga Abeywickrama
Abstract: The invention is concerned with a monitoring device, method and computer program product for monitoring a transformer having a tap changer. The transformer has at least two magnetically coupled windings and a tap changer having impedance elements and a changeover switch configured to gradually pass the impedance elements when changing between two tap changer positions during a tap change operation. The method is performed in the monitoring device and including: obtaining waveforms of measured power transmission properties recorded at the first and second transformer sides, processing the recorded waveforms for obtaining at least one waveform (Ploss) representing a tap change operation, and extracting information indicative of the performance of the tap change from the at least one waveform that represents the tap change operation.
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公开(公告)号：US10389107B1
公开(公告)日：2019-08-20
申请号：US16326020
申请日：2017-08-15
Applicant: ABB Schweiz AG
Inventor： Tord Bengtsson , Nilanga Abeywickrama
Abstract: The invention is concerned with a protection device, method and computer program product for protecting a transformer including a tap changer and a transformer arrangement including a transformer and a protection device. The transformer has at least two magnetically coupled windings with terminals (MT1, MT2, MT3, MT4) at which power enters and exits the transformer and a tap changer having impedance elements and a switch configured to gradually connect the impedance elements when changing between two tap changer positions during a tap changing operation. The method is performed in the protection device and includes: obtaining measurements of power transmission properties (Iin, Uin, Iout, Uout) at the magnetically coupled windings, estimating energy deposited in the impedance elements during a tap changing operation based on the measured physical properties, comparing the estimated deposited energy with a failure threshold, and protecting the transformer in case the threshold is exceeded, wherein the estimating of the deposited energy includes determining the power loss of the transformer between the terminals (MT1, MT2) where power enters and the terminals (MT3, MT4) where power leaves the transformer and integrating the power loss.
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公开(公告)号：US20190252874A1
公开(公告)日：2019-08-15
申请号：US16326020
申请日：2017-08-15
Applicant: ABB Schweiz AG
Inventor： Tord Bengtsson , Nilanga Abeywickrama
IPC: H02H7/055
CPC classification number: H02H7/055
Abstract: The invention is concerned with a protection device, method and computer program product for protecting a transformer including a tap changer and a transformer arrangement including a transformer and a protection device. The transformer has at least two magnetically coupled windings with terminals (MT1, MT2, MT3, MT4) at which power enters and exits the transformer and a tap changer having impedance elements and a switch configured to gradually connect the impedance elements when changing between two tap changer positions during a tap changing operation. The method is performed in the protection device and includes: obtaining measurements of power transmission properties (Iin, Uin, Iout, Uout) at the magnetically coupled windings, estimating energy deposited in the impedance elements during a tap changing operation based on the measured physical properties, comparing the estimated deposited energy with a failure threshold, and protecting the transformer in case the threshold is exceeded, wherein the estimating of the deposited energy includes determining the power loss of the transformer between the terminals (MT1, MT2) where power enters and the terminals (MT3, MT4) where power leaves the transformer and integrating the power loss.
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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
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.
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Patent Agency Ranking
公开(公告)号：US20180113164A1
公开(公告)日：2018-04-26
申请号：US15559317
申请日：2016-03-17
Applicant: ABB Schweiz AG
Inventor： Nilanga Abeywickrama
CPC classification number: G01R31/1245 , G01R27/2688 , G01R27/2694 , G01R31/027
Abstract: A system for monitoring transformer bushings sensors, wherein first and second bushing sensors are connected to a common first phase of a high voltage source, and the third and fourth bushing sensors are connected to a common second phase of the high voltage source. A first time series is generated from the first and second bushing sensors during a predetermined time interval. A second time series, is generated from the third and fourth bushing sensors during the predetermined time interval. A correlation model for the first and second time series for determining a difference between a measured signal and an estimated signal, and generating a signal indicative of a bushing problem the difference is larger than a threshold.
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公开(公告)号：US10345366B2
公开(公告)日：2019-07-09
申请号：US15559317
申请日：2016-03-17
Applicant: ABB Schweiz AG
Inventor： Nilanga Abeywickrama
Abstract: A system for monitoring transformer bushings sensors, wherein first and second bushing sensors are connected to a common first phase of a high voltage source, and the third and fourth bushing sensors are connected to a common second phase of the high voltage source. A first time series is generated from the first and second bushing sensors during a predetermined time interval. A second time series, is generated from the third and fourth bushing sensors during the predetermined time interval. A correlation model for the first and second time series for determining a difference between a measured signal and an estimated signal, and generating a signal indicative of a bushing problem the difference is larger than a threshold.
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公开(公告)号：US20190195933A1
公开(公告)日：2019-06-27
申请号：US16328482
申请日：2017-08-25
Applicant: ABB Schweiz AG
Inventor： Tord Bengtsson , Nilanga Abeywickrama
CPC classification number: G01R31/027 , H01F29/02 , H01F38/14 , H02H7/055
Abstract: The invention is concerned with a monitoring device, method and computer program product for monitoring a transformer having a tap changer. The transformer has at least two magnetically coupled windings and a tap changer having impedance elements and a changeover switch configured to gradually pass the impedance elements when changing between two tap changer positions during a tap change operation. The method is performed in the monitoring device and including: obtaining waveforms of measured power transmission properties recorded at the first and second transformer sides, processing the recorded waveforms for obtaining at least one waveform (Ploss) representing a tap change operation, and extracting information indicative of the performance of the tap change from the at least one waveform that represents the tap change operation.
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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.
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公开(公告)号：US20190041437A1
公开(公告)日：2019-02-07
申请号：US16075858
申请日：2017-02-13
Applicant: ABB Schweiz AG
Inventor： Nilanga Abeywickrama , Svante Karlsson , Tord Bengtsson
IPC: G01R21/133 , G01R19/25 , G01R31/02
CPC classification number: G01R21/1331 , G01R19/2513 , G01R21/133 , G01R29/20 , G01R31/027
Abstract: A system and a method for determining the power loss of a transformer. The method includes measuring voltage and current at the primary side of the transformer, calculating input power by multiplying the measured current and voltage on the primary side of the transformer; measuring voltage and current at the secondary side of the transformer, calculate a nominal error ratio, calculating output power by multiplying the measured current and voltage on the secondary side of the transformer. The method further involves calculating a first corrected power loss by means of multiplying the input power with the nominal error ratio and subtract the output power.
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