Results 171 to 180 of about 1,432 (200)

Overvoltages caused by switching unloaded cable lines by a vacuum switch

Electrical Engineering, 2004
The paper presents results of the studies on overvoltages generated while switching unloaded medium voltage (MV) power cable lines by a vacuum switch. The studies were carried out while switching real MV cable lines and their physical models. It has been found that overvoltages and overcurrents are generated during switching, and that under certain ...
Ryszard Batura, Władysław Opydo
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A new simulation method of switching overvoltage on shunt capacitors

The 2014 2nd International Conference on Systems and Informatics (ICSAI 2014), 2014
Shunt capacitor banks are widely used in reactive power compensation, but the operating over voltage caused by the frequent operation of shunt capacitors would damage the insulated equipment and affect the reliability of power system. For simulating the switching off over voltage of shunt capacitors by vacuum circuit breakers, the model by adding a ...
Liqun Shang, Senfeng Zhang
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Vacuum breaker simulation for switching overvoltage study

2016 Electric Power Quality and Supply Reliability (PQ), 2016
Overvoltage is one of the most common types of electrical interferences in power supply systems. Significant part of overvoltages is caused by switching off the high inductive load, such as transformers, reactors and electrical machines. This paper is dedicated to vacuum circuit breakers switching off process modeling in Simulink MATLAB for the purpose
Daniil I. Ivanchenko, Nikita G. Novozhylov   +1 more
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Switching Overvoltages, Substations

2018
This chapter aims to present switching overvoltage insulation coordination methods for substations. As for transmission lines, switching overvoltages only become important for systems whose nominal system voltage is equal to or greater than 345 kV.
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Overvoltages in power transformers caused by no-load switching

IEEE Transactions on Power Delivery, 1995
When an unloaded power transformer is switched on via a relatively long cable, sometimes extreme high voltages appear at the secondary side of the transformer. These overvoltages are caused by a resonant phenomenon that occurs when the resonant frequencies of the transformer and the cable match.
Paap, G.C. (author), Alkema, A.A. (author), Van der Sluis, L. (author)   +2 more
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Harmonics and transient overvoltages due to capacitor switching

[Proceedings] 1992 Rural Electric Power Conference. Papers presented at the 36th Annual Conference, 1993
This work presents a study of the steady-state and transient effects of power factor correction capacitors on the utility and on the customer. In the presence of harmonic-producing loads, capacitors used for power factor correction can cause parallel or series resonance problems which tend to increase the total harmonic distortion (THD) of the voltage ...
A.A. Girgis, C.M. Fallon, J.C.P. Rubino, R.C. Catoe   +3 more
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Mitigation of microgrid's switching overvoltages using supercapacitor

2017 Nineteenth International Middle East Power Systems Conference (MEPCON), 2017
The mitigation of the switching overvoltages on microgrid systems is investigated in this paper using the supercapacitor. A comparison between a traditional switching overvoltages mitigation method, such as surge arrester, and the proposed supercapacitor-based mitigation method is studied.
Eman A. Awad, Ebrahim A. Badran, Fathi M. H. Youssef   +2 more
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Influence of Shunt Reactor Switching on Overvoltages in 400 kV Substation

2020 9th Mediterranean Conference on Embedded Computing (MECO), 2020
Different types of transient phenomena are found in power systems. Switching transients in power systems have always been a matter of concern in insulation coordination studies. The reactors in power system are widely used elements which purpose is to provide stable power flow in normal conditions and to reduce dynamical and thermal stresses during ...
Selma Grebovic, Nermin Oprasic, Adis Balota   +2 more
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Reduction of switching overvoltages by means of controlled switching

2020
122
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Reduction of Switching Overvoltages in EHV and UHV Systems

IEEE Transactions on Power Apparatus and Systems, 1971
The reduction of switching overvoltages by means of synchronized circuit-breakers with pre-insertion resistors is studied. The influence of system and breaker parameters is ascertained. The study shows that the reduction obtainable in a shunt-compensated system is sufficient for future UHV applications.
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