Simulation of transformer behaviour subject to fast transients using a tesla transformer

Sels, Tom; Craenenbroeck, Thierry Van; Brouwers, Barbara; Dommelen, Daniel Van; Ceuster, J. De

doi:10.1049/cp:20000521

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…As explained in [10], the high-frequency impedance has a direct link with the demagnetization of permanent magnet synchronous motors. Tests of lightning impulse conferring the norms using a standardized 1.2/50 μs waveform failure tests through using a large dv/dt impulse voltage like 250/2500 μs transient are popularly done [49,50].…”

Section: Discussionmentioning

confidence: 99%

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Pannila

Edirisinghe

2021

Journal of Electrical and Computer Engineering

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Electrical equipment and supply cables demand a better quality of supply, with the recent advancements in integrated sensitive solid-state controls. Divergently, proliferated heavy inductive motors and some performance additions based on power electronics have introduced power quality issues to the network. Thus, this study mainly investigates the impact of switching transients generated by electromechanical machines in industrial power systems on insulation deterioration while taking transient overvoltages due to capacitor bank switching also to support. Transients with a high rate of rise are likely to catalyze the degradation of the insulation quality and break down the insulating material through ionization. These steeply passing overvoltage stresses let partial discharges ensue, which can attack the insulation over long service. To unveil this danger, 314 common-mode transient waveforms were measured in the electrical machines of five tea factories in Sri Lanka, in a 50 ms measurement window, taken in 55 measuring attempts. Most of the transients observed are in the form of a damped oscillatory waveform tailed by fast exponential collapse. That correlates to insulation degradation having a very steep rise as 30.04 V/ns, the highest at the withering section. When machines are heavily loaded, situations tend to generate transients with high amplitudes. There were transient bursts that spread as 426.3 ms, while 14 ns fast rise times were recorded from withering motors. Unlike electrical resonance and power-frequency overvoltages, electromagnetic switching transients last even less than 100 ms. To underline this, an analysis of the frequency domain of transients was also presented, which proves high density of high-frequency components reaching 107 kHz range. Accepting the fact that frequency and amplitude are always under the influences of innumerable dynamics, the observational evidence of the study endorses that electrical stress built by the transient nature of the factories reduces the life expectancy of electrical insulation.

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Section: Discussionmentioning

confidence: 99%

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Pannila

Edirisinghe

2021

Journal of Electrical and Computer Engineering

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“…By adding the nano-fillers it is proposed that the mechanical strength as well as the thermal strength of the insulator increases. Increase in the aforementioned two properties ensures durability of the insulator i.e., even with less volume the insulator can with stand very high transmission voltages [8]. Hence, detailed studies and substantial analysis of insulation system comprising nano-fillers may provide innovative solutions to insulation system in a variety of applications such as outdoor insulators, switchgears, DC cables, electrochemical capacitors, and insulation for inverter-fed motors etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of SiO2 and TiO2 Nano Fillers in Enhancing the Insulation Breakdown Strength of Epoxy Nano Composite Dielectric under Divergent Electric Fields

Ghouse¹,

Venkatesh²,

Rajesh³

et al. 2013

ijeei

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The proper mixing of nanoscale fillers in conventional dielectric materials leads to an enhancement in the breakdown strength and voltage endurance. In this study experimental investigations are carried out to compare the breakdown characteristics of epoxy nano-composites with that of a base epoxy resin under the influence of divergent electric fields so as to obtain inferences on its breakdown performances. This would in turn enable providing solutions to acquire more effective electrical insulation systems and explore the prospect of tapping the merits of utilizing the rapid strides made in field of fabrication of nano-dielectrics. The main objective is such studies are to enhance the electrical properties of the epoxy dielectric by employing nano-fillers such as SiO 2 , TiO 2 etc. This research envisages the use of epoxy resin mixed with nano-fillers for ascertaining the ability of the nano-composite to be utilized as a dielectric/ insulator in power apparatus. The epoxy resin is mixed with appropriate proportion of SiO 2 and TiO 2 and experimentation is carried out under the influence of divergent electric fields. Classical breakdown voltage withstand tests such as AC power frequency, DC voltage, lightning impulse and switching impulse test is carried out on epoxy dielectrics (with and without nano-fillers) and the results are compared. In addition, a non-classical breakdown voltage test (high frequency high voltage) is also devised to analyze and ascertain the breakdown characteristics due to varying frequencies so as to investigate the possibility of utilizing such nano-composites in applications related to high speed switching devices.

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Fast transients and their effect on transformer insulation: simulation and measurements

Herdt¹,

Declercq²,

SeIs³

et al. 2001

16th International Conference and Exhibition on Electricity Distribution (CIRED 2001)

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Simulation of transformer behaviour subject to fast transients using a tesla transformer

Cited by 4 publications

References 3 publications

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Effects of SiO2 and TiO2 Nano Fillers in Enhancing the Insulation Breakdown Strength of Epoxy Nano Composite Dielectric under Divergent Electric Fields

Fast transients and their effect on transformer insulation: simulation and measurements

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