Results 161 to 170 of about 426,824 (203)

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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Mitigation of switching overvoltages in transmission lines via controlled switching

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008
The goal of this work is to present a controlled switching strategy to reduce overvoltages due to transmission line closing and re-closing. Controlled closing and re-closing of transmission lines eliminates the need of pre-insertion resistors, reducing in this way the costs of transmission line circuit breakers.
Karcius M. C. Dantas, Damsio Fernandes, L. A. Neves, Benemar A. Souza, Luiz C. A. Fonseca   +4 more
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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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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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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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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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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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Reduction of switching overvoltages by means of controlled switching

2020
122
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Simulation of switching overvoltage in mine production unit

2017 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus), 2017
The problem of overvoltage is particularly important for underground coal mine electric power supply systems as degradation of insulation may lead to electric faults, power outages, fire and explosion of methane and coal dust. This paper is dedicated to simulation of overvoltage in vacuum circuit breaker caused by emergency deenergization of mine ...
Daniil I. Ivanchenko, Emiliia V. Iakovleva   +1 more
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Switching overvoltages in motor circuits for petrochemical applications

Record of Conference Papers. Industry Applications Society Forty-Seventh Annual Conference. 2000 Petroleum and Chemical Industry Technical Conference (Cat. No.00CH37112), 2002
The switching of HV motor circuits in the MW range can cause large overvoltages on motor terminals. The amplitude of the resulting voltage spikes depends on breaker and circuit characteristics. If the amplitude of switching overvoltages exceeds the BIL (basic insulation level) of the motor, overvoltage protection circuitry should be installed to ...
M. Berth, L. Kung, E.F.D.E. Limbeek
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