Effect of CT transient characteristics on transfer of inrush

During the inrush period, multiple misoperation accidents of differential protection of transformers happened, which seriously threatened the safe and stable operation of power grid. In the traditional malfunction analysis, only the inrush current process is considered, and the electromagnetic trans...

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Main Authors: Wei Liu, Yuanlin Pan, Yuxue Wang, Xianggen Yin, Zengchao Wang, Wenbin Cao
Format: Article
Language:English
Published: Wiley 2019-01-01
Series:The Journal of Engineering
Subjects:
Online Access:https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8441
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spelling doaj-2ae61407cfbd489e8f4f8e0cdf0024b62021-04-02T13:27:08ZengWileyThe Journal of Engineering2051-33052019-01-0110.1049/joe.2018.8441JOE.2018.8441Effect of CT transient characteristics on transfer of inrushWei Liu0Yuanlin Pan1Yuxue Wang2Xianggen Yin3Zengchao Wang4Wenbin Cao5Power Dispatching Control Center of Guangdong Power GridState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and TechnologyPower Dispatching Control Center of Guangdong Power GridState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and TechnologyPower Dispatching Control Center of Guangdong Power GridState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and TechnologyDuring the inrush period, multiple misoperation accidents of differential protection of transformers happened, which seriously threatened the safe and stable operation of power grid. In the traditional malfunction analysis, only the inrush current process is considered, and the electromagnetic transient interaction between the transformer and other non-linear ferromagnetic components such as CT is hardly considered. Here, the variation rule of inrush current waveform characteristic is analysed, and the influence rule of secondary load and type of CT on inrush current second harmonic proportion and dead angle is simulated by using the simulation Lucas model of industrial practical CT (P/PR). The results show that the second harmonic proportion of the inrush current and the dead angle of the waveform depend on the saturation angle of the transformer core. The larger the saturation angle is, the smaller the second harmonic proportion is, and the larger the dead angle of the waveform is. The second harmonic proportion of the inrush current becomes larger, and the dead angle of sympathetic inrush becomes smaller after CT transfer. The dead angle of magnetising inrush waveform depends on the secondary load resistance. It may increase or decrease..https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8441power transformer protectiontransformer coresferromagnetic materialscurrent transformerstransformer coreCT transferdifferential protectionCT transient characteristicsmultiple misoperation accidentspower componentsadjacent transmission linespower gridelectromagnetic transient interactionsimulation Lucas modelindustrial practical CTmalfunction analysisinrush transfer periodtransformer transient inrush current processinrush current second harmonic proportionP-PRmultiple nonlinear ferromagnetic components
collection DOAJ
language English
format Article
sources DOAJ
author Wei Liu
Yuanlin Pan
Yuxue Wang
Xianggen Yin
Zengchao Wang
Wenbin Cao
spellingShingle Wei Liu
Yuanlin Pan
Yuxue Wang
Xianggen Yin
Zengchao Wang
Wenbin Cao
Effect of CT transient characteristics on transfer of inrush
The Journal of Engineering
power transformer protection
transformer cores
ferromagnetic materials
current transformers
transformer core
CT transfer
differential protection
CT transient characteristics
multiple misoperation accidents
power components
adjacent transmission lines
power grid
electromagnetic transient interaction
simulation Lucas model
industrial practical CT
malfunction analysis
inrush transfer period
transformer transient inrush current process
inrush current second harmonic proportion
P-PR
multiple nonlinear ferromagnetic components
author_facet Wei Liu
Yuanlin Pan
Yuxue Wang
Xianggen Yin
Zengchao Wang
Wenbin Cao
author_sort Wei Liu
title Effect of CT transient characteristics on transfer of inrush
title_short Effect of CT transient characteristics on transfer of inrush
title_full Effect of CT transient characteristics on transfer of inrush
title_fullStr Effect of CT transient characteristics on transfer of inrush
title_full_unstemmed Effect of CT transient characteristics on transfer of inrush
title_sort effect of ct transient characteristics on transfer of inrush
publisher Wiley
series The Journal of Engineering
issn 2051-3305
publishDate 2019-01-01
description During the inrush period, multiple misoperation accidents of differential protection of transformers happened, which seriously threatened the safe and stable operation of power grid. In the traditional malfunction analysis, only the inrush current process is considered, and the electromagnetic transient interaction between the transformer and other non-linear ferromagnetic components such as CT is hardly considered. Here, the variation rule of inrush current waveform characteristic is analysed, and the influence rule of secondary load and type of CT on inrush current second harmonic proportion and dead angle is simulated by using the simulation Lucas model of industrial practical CT (P/PR). The results show that the second harmonic proportion of the inrush current and the dead angle of the waveform depend on the saturation angle of the transformer core. The larger the saturation angle is, the smaller the second harmonic proportion is, and the larger the dead angle of the waveform is. The second harmonic proportion of the inrush current becomes larger, and the dead angle of sympathetic inrush becomes smaller after CT transfer. The dead angle of magnetising inrush waveform depends on the secondary load resistance. It may increase or decrease..
topic power transformer protection
transformer cores
ferromagnetic materials
current transformers
transformer core
CT transfer
differential protection
CT transient characteristics
multiple misoperation accidents
power components
adjacent transmission lines
power grid
electromagnetic transient interaction
simulation Lucas model
industrial practical CT
malfunction analysis
inrush transfer period
transformer transient inrush current process
inrush current second harmonic proportion
P-PR
multiple nonlinear ferromagnetic components
url https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8441
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AT yuanlinpan effectofcttransientcharacteristicsontransferofinrush
AT yuxuewang effectofcttransientcharacteristicsontransferofinrush
AT xianggenyin effectofcttransientcharacteristicsontransferofinrush
AT zengchaowang effectofcttransientcharacteristicsontransferofinrush
AT wenbincao effectofcttransientcharacteristicsontransferofinrush
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