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...
Main Authors: | , , , , , |
---|---|
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 |
id |
doaj-2ae61407cfbd489e8f4f8e0cdf0024b6 |
---|---|
record_format |
Article |
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 |
work_keys_str_mv |
AT weiliu effectofcttransientcharacteristicsontransferofinrush AT yuanlinpan effectofcttransientcharacteristicsontransferofinrush AT yuxuewang effectofcttransientcharacteristicsontransferofinrush AT xianggenyin effectofcttransientcharacteristicsontransferofinrush AT zengchaowang effectofcttransientcharacteristicsontransferofinrush AT wenbincao effectofcttransientcharacteristicsontransferofinrush |
_version_ |
1721564995145170944 |