Analysis of transformer loss of life driving nonlinear industrial loads by the finite elements approach

Samesima, M.I.; Resende, J.W.; Araujo, S.C.N.

doi:10.1109/ias.1995.530579

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Transformer losses and heat [15] Current harmonics induce heat, causing thermal stress. 50% of transformer loss of life attributed to nonlinear loads.…”

Section: Harmonics Findings Impact On Transformermentioning

confidence: 99%

Harmonics Emissions and Power System Grid Resilience in Electric Vehicle Charging

Diab Hraiz,

Andrés Martín García

2024

Power Quality - New Insights [Working Title]

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This chapter focuses on the harmonics emissions and power system grid resilience in electric vehicle (EV) charging. With the increasing demand for EVs, understanding the effects of harmonics on grid stability is critical. Converters in EV charging operations can contribute to high harmonics levels, causing disturbances and stressing the power system. The scope of the chapter encompasses challenges related to harmonics and emphasizes the need to ensure grid resilience. It also highlights the importance of understanding the correlations between harmonics emissions, operational parameters, and the increasing adoption of electric vehicle charging. This chapter also aims to discuss and present various harmonic mitigation techniques that can enhance power quality in electric vehicle integration.

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“…Transformer losses and heat [15] Current harmonics induce heat, causing thermal stress. 50% of transformer loss of life attributed to nonlinear loads.…”

Section: Harmonics Findings Impact On Transformermentioning

confidence: 99%

Harmonics Emissions and Power System Grid Resilience in Electric Vehicle Charging

Diab Hraiz,

Andrés Martín García

2024

Power Quality - New Insights [Working Title]

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“…Thermal stresses arise due to heat in the system introduced by transformer losses resulting from current harmonics. A total of 50% of transformer lifetime reduction is due to thermal tensions produced by non-linear loads [20]. The top-oil-rise over ambient temperature of a transformer, θ TO , is proportional to the total losses to the 0.8 exponents, and is expressed in • C, as follows [21]:…”

Section: Transformer Temperature Rise Modelingmentioning

confidence: 99%

Assessing and Mitigating Impacts of Electric Vehicle Harmonic Currents on Distribution Systems

2020

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Harmonic currents of electric vehicle (EV) chargers could jeopardize the power quality of distribution systems and add to the transformer’s losses, thus degrading its lifetime. This paper assesses and mitigates the impacts of different EV chargers on distribution transformers and the voltage quality of distribution systems. The effect of state-of-charge (SOC) of the EV battery is considered through applying weighted arithmetic mean to accurately assess the impacts of EV harmonic currents on aging and losses of the EV interfacing transformer. The voltage quality of the IEEE 33-bus distribution system, supplying several EV parking lots, is also assessed at different charging levels using a fast-decoupled harmonic power flow. A new optimal harmonic power flow algorithm—that incorporates photovoltaic-based distribution generation units (DGs)—is developed to enhance the voltage quality of distribution systems, and elongate the lifetime of the substation transformer. The effectiveness of the proposed mitigation method is confirmed using the IEEE 33-bus distribution system, hosting several EV charging stations and photovoltaic-based DGs.

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“…About 50% of a transformer loss of life is caused by thermal stresses which are produced by the non-linear load current [10]. The hottest spot winding temperature is [14];…”

Section: Transformer's Loss Of Life Calculationmentioning

confidence: 99%

“…Therefore the influence of the current harmonics is more important. Many works have been developed about the harmonic effect on power transformer loss of life [4,[8][9][10][11][12]. However, these works did not take in consideration the standards of harmonics.…”

Section: Introductionmentioning

confidence: 97%

Simulation of the impact of harmonics on distribution transformers

Said

Nor

2008

2008 IEEE 2nd International Power and Energy Conference

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The harmonic power losses cause increased operational costs and additional heating in power system components, which will reduce their expected lifetime. This is especially in the commercial building, where the usage of power is very high as there are many large scale types of equipment being used. This paper presents the effect of harmonic current distortion on the transformer useful life, K-factor calculation and using Malaysian standard to be compared in these finding. In this paper the impact of harmonic distortion on the selected distribution transformer in Universiti Teknologi Malaysia are discussed. For this research, the harmonic problem can be analyzed with the simulations, real measurements and assessments. The results show that an increase in the current harmonic distortion can increase the transformer losses and decreased it life expectancy.

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Analysis of transformer loss of life driving nonlinear industrial loads by the finite elements approach

Cited by 12 publications

References 9 publications

Harmonics Emissions and Power System Grid Resilience in Electric Vehicle Charging

Harmonics Emissions and Power System Grid Resilience in Electric Vehicle Charging

Assessing and Mitigating Impacts of Electric Vehicle Harmonic Currents on Distribution Systems

Simulation of the impact of harmonics on distribution transformers

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