Results 161 to 170 of about 577 (206)
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Suppressing overvoltage on carbodies of a highspeed EMU
2013 15th European Conference on Power Electronics and Applications (EPE), 2013Overvoltage is created on carbodies of a highspeed electric multiple unit (EMU) when the train raises its pantograph or when its main circuit breaker is switched. This paper outlines the mechanism behind the phenomenon of overvoltage generation on carbodies of the highspeed train, proposing suppressing method, and the results of verification of the ...
S. Hatsukade, K. Fujino, S. Kanno
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Overvoltage suppression for UHV transmission lines
Transactions of Tianjin University, 2008The overvoltage phenomena of ultra high voltage (UHV) transmission lines are analyzed and verified by EMTDC/PSCAD simulation. Referring to the theoretical analyses and operating experiences of extra high voltage (EHV) transmission lines in China and UHV transmission lines in Russia and Japan, the methods to suppress the internal overvoltage in UHV ...
Yongli Li +5 more
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Research on Overvoltage Suppression of the Battery Discharging in Electromagnetic Launch
2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019This paper introduces a discharging circuit of batteries in hybrid energy storage system for electromagnetic launch. The main switch, integrated gate bipolar thyristor(IGBT), has a high overvoltage at turn-off time in the discharging process. This paper analyzes the causes of the overvoltage based on the circuit structure and the timing discharging ...
Ren Zhou +5 more
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Overvoltages in reactive circuits due to current suppression
Electric Power Systems Research, 1991Abstract Serious overvoltages may be generated by current suppression (or current chopping) when switching out shunt reactors or unloaded transformers. Normalized overvoltage profiles are determined using (a) a single concentrated resistor and (b) a distributed resistance network to simulate eddy current loss in the magnetic core.
D. O'Kelly, A.R.M. Salih, B. Benson
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A hybrid active filter implementation of an overvoltage suppression scheme
2004 IEEE International Symposium on Industrial Electronics, 2004In several practical applications actuators are interconnected to a controlled plant through long cables. If the actuator operates at a fast sampling rate (with respect to the propagation delay of the cable) and its impedance cannot be neglected, wave reflections occur and the transmitted pulse are deformed-degrading the control quality.
R. Ortega +3 more
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A low-loss motor terminal filter for overvoltage suppression
2010 IEEE Energy Conversion Congress and Exposition, 2010Inverter-fed motor drive systems are widely used because of their benefits for energy efficiency and for flexible control of machinery using maintenance-free induction motors. As the inverter produces fast-switching voltage pulses, the transmission-line effects of the motor cable and motor stator windings become significant, and may lead to a doubling ...
Kuen-Faat Yuen, Henry Shu-Hung Chung
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Suppression of Transient Overvoltages on Instrumentation Wiring Systems
IEEE Transactions on Industry Applications, 1985Modern electronic analog instrumentation equipment is vulnerable to damage by transient overvoltages appearing on signal and power supply wiring. Experience with overvoltages and relatively simple techniques to avoid damage are discussed.
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Suppression of abnormal overvoltages on an HVDC transmission system
Electrical Engineering in Japan, 1978The abnormal overvoltage characteristics of an HVDC transmission system consisting of overhead and cable power conductors and a neutral return wire are analyzed. A dc transient network analyzer is used for the analysis. Measures proposed and discussed for suppressing overvoltages are the use of reverse biased diodes and damping circuits.
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Overvoltage suppression filter design methods based on voltage reflection theory
IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03., 2003To reduce voltage overshoot at the motor terminal, RLC filters are used at the inverter side with an objective of increasing the rise time, while RC filters are used at the motor side as a means of reducing the load impedance at high frequency. However, no clear optimal method for determining the filter parameters has appeared. In this work, we propose
Lee, S, Nam, K
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A Normalized Quantitative Method for GaN HEMT Turn-ON Overvoltage Modeling and Suppressing
IEEE Transactions on Industrial Electronics, 2019Gallium nitride high electron mobility transistor has been seen as a power semiconductor devices with lots of potential since it has been commercialized. However, the advantages of fast switching speed with low conduction resistance always have to compromise to the fast switching on evoked overvoltage.
Xiao Long +3 more
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