Results 181 to 190 of about 10,256 (232)

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
openaire   +1 more source

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.
openaire   +1 more source

Switching overvoltages in a three-phase transformer

[1992] Proceedings of the 35th Midwest Symposium on Circuits and Systems, 2003
Switching operations to energize or isolate a transformer result in voltages and currents of complex waveshapes in the transformer windings. The surges transferred to the coupled nonenergized windings when one winding of the transformer is energized are discussed.
C.S. Indulkar, M.S. Thomas, P.R. Bijwe
openaire   +1 more source

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
openaire   +1 more source

Protecting High-Voltage Motors Against Switching Overvoltages

2007 4th European Conference on Electrical and Instrumentation Applications in the Petroleum & Chemical Industry, 2007
In an industrial plant equipped with HV motors, several severe stator failures occurred in spite of the installation of MOA (metal-oxide arrester) surge arresters. All of these motors were switched with vacuum circuit breakers. The purpose of this paper is to demonstrate the necessity of complementary protection against overvoltages by adding C-R ...
Caroline Vollet, Benoit de Metz Noblat
openaire   +1 more source

Simulation of Switching Overvoltages and Validation With Field Tests

IEEE Transactions on Power Delivery, 2018
On transmission lines where switching surges are not mitigated with closing resistors and/or surge arresters, high-speed reclosing on a line with trapped charge will produce high overvoltages that have been measured above 3 p.u. Careful simulations of these switching events using available electromagnetic transient (EMT) programs consistently produce ...
M. Cervantes, A. Ametani, C. Martin, I. Kocar, A. Montenegro, D. Goldsworthy, T. Tobin, J. Mahseredjian, R. Ramos, J. Marti, T. Noda   +10 more
openaire   +2 more sources

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
openaire   +1 more source

Phase-Phase Switching Overvoltages, Transmission Lines

2018
Phase-phase insulation naturally occurs in stations—between buses and from one piece of equipment to another. Therefore the phase-phase strike distance and SSFOR should always be considered in station insulation coordination studies. A phase-phase insulation always exists with a phase-to-ground insulation.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source