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Transformer magnetizing inrush currents
Electrical Engineering, 1951THERE ARE formulas available by which it is possible to calculate the peak of the first cycle of magnetizing inrush current for a transformer. There have been no convenient formulas available for determining the maximum values of successive cycles of current.
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Transformer inrush - Harmonics in the current
2018 19th International Scientific Conference on Electric Power Engineering (EPE), 2018When transformer is energized, a transient current up to 10 to 15 times larger than the rated transformer current can flow for several cycles. The differential protections are mainly sensitive during this time, as the inrush current flows just on one site of the transformer and so it creates false differential current.
Bermann Jiri, Prochazka Martin
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2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC), 2016
Magnetizing inrush current will occur when the transformer is energized without load, which will cause that the already energized neighboring transformers generate sympathetic inrush current. The currents have influence on the operation of HVDC system if they occur in the converter transformers due to their characteristics.
null Rui Li +6 more
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Magnetizing inrush current will occur when the transformer is energized without load, which will cause that the already energized neighboring transformers generate sympathetic inrush current. The currents have influence on the operation of HVDC system if they occur in the converter transformers due to their characteristics.
null Rui Li +6 more
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The Inrush Current Eliminator of Transformer
2012In the power industry, transformers are key components for electrical energy transfer. However, the transformer always is affected by inrush current problems of itself. The inrush currents will cause power system network with voltage dip, harmonic, over-voltage, sympathetic current and mal-trip of protective relay and so on.
Li-Cheng Wu, Chih-Wen Liu
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Analysis on performance of inrush current identification algorithms under sympathetic inrush
7th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2006), 2006This paper is concerned with sympathetic interaction between two transformers caused by inrush transients in order to discuss whether the existing inrush current identification algorithms are applicable to sympathetic inrush. Based on models of two transformers in parallel and in series operation, the influencing factors such as system resistance ...
null Sun Xiangfei +2 more
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Capacitive current switching of Vacuum Interrupters and inrush currents
2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2012Capacitive current switching has become increasingly necessary for power factor correction in distribution systems. However, Restrikes are potentially dangerous as they could cause overvoltage which can be harmful to the power system. The dielectric strength of the Vacuum Interrupter (VI) in a capacitive current switching is strongly determined by a ...
He Yang, Yingsan Geng, Zhiyuan Liu
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The Effect of Inrush Current on Transformer Protection
2006 38th North American Power Symposium, 2006Transformers are key components for electrical energy transfer in power system. Stability and security of transformer protection are important to system operation; we found that many mal-trip cases of transformer protection are caused by inrush current problems.
Li-Cheng Wu +3 more
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Inrush currents and their effect on protective relays
2013 66th Annual Conference for Protective Relay Engineers, 2013This paper explains in detail the phenomena of inrush in single-phase transformers during three conditions: transformer energization, external fault clearing and sympathetic inrush. It then focuses on the inrush in three-phase transformers, explaining the phenomena that occurs when there is a delta winding and analyzing the types of transformer ...
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Water and mud inrush hazard in underground engineering: Genesis, evolution and prevention
Tunnelling and Underground Space Technology, 2021Yiguo XUE, Zhiqiang Li, Shucai Li
exaly
A state-of-the-art review on rock seepage mechanism of water inrush disaster in coal mines
International Journal of Coal Science and Technology, 2022Hongyu Duan
exaly