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Insulation co-ordination for continuous operating voltages and temporary overvoltages
Electrical Engineering, 2005This paper presents an approach to the insulation co-ordination of electric-power installations in the scope of the continuous operating voltages and temporary overvoltages; this approach opens the possibility to calculate the necessary required withstand voltages of unit insulations for short-duration (1 min) power-frequency test voltage, with respect
Zlatoje Zdravković +2 more
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Temporary overvoltage mitigation in symmetrical monopole VSC-MMC HVDC links
2017 AEIT International Annual Conference, 2017Symmetrical monopolar HVDC links, based on Modular Multilevel Converters (MMCs) represent the state of the art for submarine and underground cable interconnections over long distances. MMCs exhibit significant advantages if compared to other converter topologies, such as lower losses, footprint and harmonic distortion.
F. Palone, M. Marzinotto, L. Buono
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Temporary overvoltage suppression in half-wavelength transmission lines during asymmetric faults
Electric Power Systems Research, 2020Abstract This paper approaches the principal electric characteristics of half-wavelength transmission lines and possible voltage transients resulted from asymmetric faults. Although this non-conventional AC transmission technique presents some attractive advances for electric power transmission through long distances, when compared to the well ...
Felipe Proença Albuquerque +3 more
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Ground Fault Temporary Overvoltages in MV Networks: Evaluation and Experimental Tests
IEEE Transactions on Power Delivery, 2012Single-phase-to-ground faults may cause substantial temporary overvoltages (TOVs) in large radial medium-voltage networks with isolated neutral, even over 3-p.u. phase to ground. Resonant neutral earthing limits these overvoltages to 1.8 p.u. but credible earthing apparatus failures might trigger TOVs up to 2.4 p.u. This paper presents the ground fault
Alberto Cerretti +5 more
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Temporary Overvoltage and GPR Characteristics of Distribution Feeders With Multigrounded Neutral
IEEE Transactions on Power Delivery, 2010Three-phase four-wire multigrounded neutral (MGN) is the preferred distribution line configuration in North America. Its performance characteristics, such as temporary overvoltage (voltage swell) and ground potential rise (GPR), are difficult to understand and assess due to the presence of a neutral conductor and the conductor's multiple grounding ...
Janak R. Acharya, Yunfei Wang, Wilsun Xu
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Temporary overvoltage capability of surge arresters for 1000 kV power systems
Electrical Engineering in Japan, 1996AbstractInsulation level (LIWV 2250 kV) of 1000 kV gas insulated switchgear will be adopted by installing high performance 1000 kV surge arresters. But when temporary overvoltage (TOV) is generated in power systems at line faults and load rejection including Ferranti effects, high performance surge arresters flow discharge current according to the ...
Yasuhiko Nakada +3 more
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Energy stresses of station surge arresters due to temporary overvoltages
2009Usually the voltage rating of station surge arresters is chosen higher than the amplitude of the temporary overvoltages (TOV) which can occur in the power system. This approach leads to the use of arresters with a high protection levels, especially if the system is not solidly grounded, which do not reduce the level of slow-front and fast-front ...
Pavić, Ivica +2 more
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Analytical prediction of abnormal temporary overvoltages due to ground faults in MV networks
Electric Power Systems Research, 2007Abstract The paper deals with the temporary overvoltages that build up in radial MV distribution networks following the inception of a 1-phase-to-ground fault. It will be demonstrated that, for extended cable/overhead MV distribution networks with ungrounded neutral, in case of low resistance faults at critical locations along overhead lines, the ...
GATTA, Fabio Massimo +3 more
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A Mitigation Strategy for Temporary Overvoltages Caused by Grid-Connected Photovoltaic Systems
IEEE Transactions on Energy Conversion, 2015Widespread penetration of distributed generators (DGs) into the power system has aggravated the problem of temporary overvoltages (TOVs), which can inflict substantial damages on the DGs, equipment, and other customers. Through slight modifications to the power-electronic circuit and its control, this paper proposes a strategy for limiting the TOVs ...
Hamidreza Ghoddami, Amirnaser Yazdani
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Special methods for the calculation of temporary overvoltages due to transformer saturation
2001 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.01CH37194), 2002Summary form only given as follows. During power restoration, the energization of a no load transformer can lead to high overvoltages, the amplitude being sensible to initial conditions. This document describes an approach based on the AUTO program, which is a complementary tool to EMTP, and may help the understanding of the behaviour of the electrical
M. Rioual, C. Sicre, K.B. Driss
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