Effects of voltage harmonic on losses and temperature rise in distribution transformers

Dao, Thinh; Phung, B.T.

doi:10.1049/iet-gtd.2017.0498

Cited by 35 publications

(16 citation statements)

References 22 publications

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“…In the case of a line-to-line voltage THD of about 12%, the no-load losses and no-load current increase in about 3.46% and 37.3% compared to a sinusoidal voltage. The work in [10] analyzes the effect of grid voltage harmonics on the distribution transformer performance. Some results show that the core losses increase by about 21% when the voltage harmonics are given by the worst-case scenario of the harmonics limits given by IEC 61000-3-6.…”

Section: Losses In Distribution Transformersmentioning

confidence: 99%

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Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

et al. 2021

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Distribution systems are under constant stress due to their highly variable operating conditions, which jeopardize distribution transformers and lines, degrading the end-user service. Due to transformer regulation, variable loads can generate voltage profiles out of the acceptable bands recommended by grid codes, affecting the quality of service. At the same time, nonlinear loads, such as diode bridge rectifiers without power factor correction systems, generate nonlinear currents that affect the distribution transformer operation, reducing its lifetime. Variable loads can be commonly found at domiciliary levels due to the random operation of home appliances, but recently also due to electric vehicle charging stations, where the distribution transformer can cyclically vary between no-load, rated and overrated load. Thus, the distribution transformer can not safely operate under highly-dynamic and stressful conditions, requiring the support of alternative systems. Among the existing solutions, hybrid transformers, which are composed of a conventional transformer and a power converter, are an interesting alternative to cope with several power quality problems. This article is a review of the available literature about hybrid distribution transformers.

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Section: Losses In Distribution Transformersmentioning

confidence: 99%

“…Distribution transformers can be subject to different power quality problems in distribution grids when supplying nonlinear currents and nonlinear voltages [9,10]. Industrial applications, such as elevators, rolling mills, arc furnaces, among others, consume high amounts of current in shorts periods, worsening distribution grid operation.…”

Section: Introductionmentioning

confidence: 99%

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

et al. 2021

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“…3, a copper plate is used for the engineering-oriented modelling of the stray-field loss in nonmagnetic structural components of large converter transformers. The loss evaluation based on measurement can be achieved according to (3).…”

Section: Modelling Of Stray-field Loss In Copper Shieldingmentioning

confidence: 99%

“…In normal operation of the converter transformer, there are rich harmonics in a wide-frequency range in excitation current of the windings [2]. The consequently generated harmonic leakage magnetic field leads to a significant increase of stray-field loss in structural components and then causes local overheating in converter transformers [3,4]. Therefore, it is quite important and urgent to explore the mechanism and influence of stray-field loss caused by three-dimensional (3D) multi-harmonic excitations, with the increasing demand for safe and reliable converter transformers in the HVDC transmission system [5].…”

Section: Introductionmentioning

confidence: 99%

Calculation and validation of stray‐field loss in magnetic and non‐magnetic components under harmonic magnetizations based on TEAM Problem 21

Zhao

Wang

Liu³

et al. 2020

IET Electric Power Applications

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On the basis of the TEAM problem 21 benchmark model, a modelling method to predict stray-field loss under real working conditions is presented and validated to investigate the influence of harmonic excitation on stray-field loss of shielding structural components of converter transformers in high-voltage direct current systematically. An improved method is adapted to determine stray-field loss of magnetic and non-magnetic component based on the experimental measurement and numerical simulation. An experimental platform is established to measure magnetic properties and loss characteristics of the grainoriented silicon steel sheets, aiming at parameter identification and verification of the loss modelling applicable for laminated sheets under harmonic magnetisation. Meanwhile, the additional iron loss caused by perpendicular flux penetration is obtained by special treatment of material properties and analysed to observe its contribution to the stray-field loss under threedimensional harmonic magnetisation. Field and loss comparison between measurement and simulation verifies the validation of the proposed modelling method.

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“…2a, it is observed that on application of AC voltage, irrespective of the sample, the presence of harmonics degrades the SDIV, this degradation is more when the %THD and frequency content of harmonics is increased. Dao and Phung [14] have reported that the presence of waveform distortion adversely affects the reliability and life of insulation.…”

Section: Surface Discharge Inception Voltage Analysis Adopting Uhf Tementioning

confidence: 99%

Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard

Thakur

Sarathi

2019

IET Science, Measurement & Technology

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Effects of voltage harmonic on losses and temperature rise in distribution transformers

Cited by 35 publications

References 22 publications

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

Calculation and validation of stray‐field loss in magnetic and non‐magnetic components under harmonic magnetizations based on TEAM Problem 21

Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard

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