Results 181 to 190 of about 9,833 (209)

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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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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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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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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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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Equations for some transient overvoltage test waveforms

IEEE Transactions on Electromagnetic Compatibility, 1988
Simple equations are provided that satisfy the definitions of five of the most common transient overvoltage test waveforms: the ringwave specified in ANSI C62.41-1980, the fast transient specified in IEC 801, and the 8/20- mu s 1.2/50- mu s, and 10/1000- mu s waveforms.
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Factors affecting transient overvoltages of electric submersible pumps

IEEE Potentials, 2006
This article presents a theoretical simulation and analysis of all possible factors due to transient overvoltages (TOVs) that could contribute to electrical failures of electric submersible pump (ESP) motors used in oil fields. A transient calculations software package PSCAD is used to simulate a single cable-fed, 3.3-kV induction motor including the ...
I.A. Metwally, A. Gastli
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Very Fast Transient Overvoltage of UHVAC System

2017
Compared with 500 kV EHV GIS substation, 1000 kV UHV GIS/HGIS substation has different characteristics in terms of switchgear, system structure, insulation margin, requirements on safety and stability and importance. And the hazardness of very fast transient overvoltage (VFTO) on UHV GIS is much heavier than that in 500 kV power system.
Yang Li, Guoming Ma, Hao Zhou
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Transient overvoltages in a railway system during braking

2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA), 2010
This paper presents an overvoltage analysis in the dc catenary of The Metro de Medellin railway system. The main objective is to study the sources of damages of motors in the trains. It was achieved a detailed study beginning with the direct measurement of variables and then the construction of a digital model in PSCAD-EMTDC.
Mario A. Suarez, Jorge W. Gonzalez, Israel Celis   +2 more
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Very Fast Transient Overvoltage Measurement With Dielectric Window

IEEE Transactions on Power Delivery, 2014
The method of using the electrode inserted into gas-insulated switchgear (GIS) to form a capacitor sensor has the best bandwidth to measure the very fast transient overvoltage. However, the power in the GIS conductor has to be cut off during the repair and replacement of the sensor.
Guo-Ming Ma, Cheng-Rong Li, Wei-Jiang Chen, Min Chen, Ze-Lai Sun, Wei-Dong Ding, Zhi-Bing Li   +6 more
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