Overvoltages

Overvoltagesin PowerSystems

Chapter 4-3 •Examination of overvoltages on the power system includes a study of their magnitudes, shapes, durations, and frequency of occurrence.

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LIGHTNING AND SWITCHING TRANSIENT OVERVOLTAGES IN POWER ...

LIGHTNING AND SWITCHING TRANSIENT OVERVOLTAGES IN POWER DISTRIBUTION SYSTEMS FEEDING DC ELECTRIFIED RAILWAYS G.B. Gharehpetian 1, Farhad Shahnia 2 1 Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran 2 Eastern Azarbayjan Electric Power Distribution Company ...

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Investigation of Transmission Line Overvoltages and their ...

Abstract —The two significant overvoltages in power system, switching overvoltage and lightning overvoltage, are investigated in this paper. Firstly, the effect of various power system parameters on Line Energization overvoltages is evaluated by simulation in ATP.

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OVERVOLTAGES DUE TO CAPACITORS BANK SWITCHING IN A 60kV SYSTEM

OVERVOLTAGES DUE TO CAPACITORS BANK SWITCHING IN A 60kV SYSTEM José M. R. Baptista Departamento de Engenharias Universidade de Trás-os-Montes e Alto Douro, 5000 Vila Real, PORTUGAL Manuel R. Cordeiro Departamento de Engenharias Universidade de Trás-os-Montes e Alto Douro, 5000 Vila Real ...

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Ferroresonant Overvoltage Investigation in Wye-Wye ...

To limit the damage to the distribution system, sustained overvoltages should be limited to 1.1 pu across transformer windings and 1.25 pu across the metal oxide lightning arresters [6].

www.aedie.org

Losses, audible noise and overvoltages in induction motor drives

Losses, audible noise and overvoltages in induction motor drives S. Van Haute, A. Malfait, R. Reekmans, R. Belmans Katholieke Universiteit Leuven Dept. E.E. (ESAT) - ELEN Belgium Abstract __Experiments are performed to analyse the influence of the Volt/Hz ratio and the switching frequency on ...

www.esat.kuleuven.be

Temporary Overvoltage Equipment Limits - Summary Report

2 12/17/04 TOV Limit Recommendations Executive Summary: The effects of temporary overvoltages (TOVs) on the transmission system have been reviewed and surge arresters were determined to be the limiting element.

www.ct.gov

Overvoltage Protection

Representation of the various disturbances on electrical networks Temporary phenomenon Duration > 200ms Harmonics Micro breaks Operating overvoltages Indirect lightning strikes Direct lightning strikes General points on lightning and its risks Causes of transient overvoltages Transient phenomenon ...

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Calculation of Lightning-Induced Overvoltages using MODELS

Calculation of Lightning-Induced Overvoltages using MODELS H. K. Høidalen SINTEF Energy Research 7034 Trondheim, NORWAY hans.hoidalen@energy.sintef.no Abstract - The paper presents a method for calculation of lightning-induced overvoltages (LIO).

www.elkraft.ntnu.no

Program ATP/EMTP in overvoltage education

Introduction Characteristic feature of present electric and electronic devices and systems is a small resistance for different types of overvoltages.

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