Results 161 to 170 of about 1,696 (209)

Transient overvoltages on power systems

IEE Proceedings C Generation, Transmission and Distribution, 1986
Power systems are subjected to many forms of transient phenomena brought about essentially by sudden changes in the steady state values of voltages or currents. Such changes may be the result of a lightning stroke, some malfunction of the system or be brought about by the switching of a circuit either to clear a fault or as a normal operational ...
J.P. Bickford, A.G. Heaton
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Galvanostatic transients and crystallization overvoltage

Canadian Journal of Chemistry, 1978
The theory of galvanostatic transients is extended to include the formation of a three-dimensional crystalline layer. The mechanism of formation of this layer is assumed to be one of nucleation and subsequent growth of randomly distributed nuclei on the electrode surface.
Stephen Fletcher, Arthur Smith
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Transient overvoltages and power-line terminations

Proceedings of the Institution of Electrical Engineers, 1966
The paper outlines an investigation which was initiated to obtain an understanding of the mechanism by which overvoltages, of sufficient magnitude to cause flashover, are produced on a line section which forms part of a 132kV system. The line is terminated at one end with a series-connected inductor; the overvoltage occurs when the line is initially ...
A.G. Heaton, I.A. Reid
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Calculation of energy in transient overvoltages

National Symposium on Electromagnetic Compatibility, 2003
It is argued that the calculation of the energy in a transient overvoltage using the time integral of V/sup 2/(t)/Z, where Z has the default value of 50 Omega and the voltage, V(t), is that between the hot conductor in the AC line and ground, is inaccurate. A quantitative error analysis is presented that uses an artificial AC line network to simulate a
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Very first transient overvoltages in GIS

POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002
A differentiating/integrating (D/I) system which does not change GIS (gas insulated substation) configuration is developed for the measurement of very fast transient overvoltages (VFTO) occurring in GIS. Then the numerical computation of VFTO is studied on the base of field measurement results.
null Zhang Wenyuan, null Shi Baozhuang, null Qiu Yuchang   +2 more
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Research on Transient model of Transient Enclosure Overvoltage in UHV GIS

2019 Chinese Automation Congress (CAC), 2019
With the increase of voltage grade, the effects of electromagnetic transient process of power system should not be ignored. In order to provide the theoretical reference for UHV substation, continuous optimization models is very important. In this thesis, we do some calculations and analysis of the TEV which occurs in 1100kV substation of south ...
Qiang Zhang, Debin Han, Hui Zeng, Junjie Sun, Yao Fu, Jiabin Zhang, Yang Liu   +6 more
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Computation of Very Fast Transient Overvoltages in Transformer Windings

IEEE Power Engineering Review, 2002
The paper deals with the computation of very fast transient overvoltages (VFTO) in transformer windings. For this purpose an algorithm is developed. The applied algorithm uses a hybrid model, which is a combination of the multi-conductor transmission line model (MTLM) and the single-transmission line model (STLM).
Popov, M. (author), van der Sluis, L. (author), Paap, G.C. (author), De Herdt, H. (author)   +3 more
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Transient overvoltages in mine power systems

2022
 This thesis investigates the nature and magnitude of switching transient overvoltages that can be expected in inductively grounded underground coal mines. Computer models of power system equipment have been developed to analyse single-phase fault isolations; motor starts (including prestriking) and motor turn offs.
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Measuring transient overvoltage on instrument feeders

Radio and Electronic Engineer, 1964
The problem of obtaining information on unwanted transient voltages which may damage semiconductors is considered in relation to electricity generating and switching stations. It is concluded that the collection of data from actual sites by an unattended monitoring instrument would yield valuable information with the minimum effort.
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Transient overvoltage protection for UPS applications

2011 IEEE Trondheim PowerTech, 2011
Uninterruptible Power Supplies (UPS) are used to ensure a continuous and reliable supply to critical loads. Different UPS technologies are available, offering different levels of load protection and power conditioning. This paper discusses various UPS topologies and operating modes, identifying the paths over which a surge or transient voltage may ...
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