The effect of harmonics on power transformers loss of life

Delaiba, Antônio Carlos; Oliveira, José Carlos de; Vilaca, A.L.A.; Cardoso, José Roberto

doi:10.1109/mwscas.1995.510243

Cited by 17 publications

(12 citation statements)

References 6 publications

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“…How these losses will increase will depend on the value of each harmonic voltage associated with the harmonic order of each component. Hysteresis and eddy current losses are obtained by (6) and (7) respectively [2], where PH is the hysteresis losses and PEC is the eddy current losses, considering harmonic distortion at the voltage:…”

Section: A Effects O/voltage Distortion In the No-load Lossesmentioning

confidence: 99%

Evaluation of power transformers design for feeding nonlinear loads - comparison between theory and practice tests

Parentoni

Abreu

Belchior

2010

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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The a im of this paper is to evaluate the design of transformers for feeding non-linear loads. The first analysis is obtained in a theoretical way through the traditional calculations of electrical losses. After that, in an experimental analysis, the addition of losses is obtained for the same condition of current harmonic distortion by measuring the temperature in a transformer prototype. Finally the results obtained, either from theoretical calculations on the basis of laboratory tests are compared, revealing two different ways of approaching the same problem.

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Section: A Effects O/voltage Distortion In the No-load Lossesmentioning

confidence: 99%

Evaluation of power transformers design for feeding nonlinear loads - comparison between theory and practice tests

Parentoni

Abreu

Belchior

2010

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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“…The proposed expansion provides a useful tool in specifying properly designed dry-type power distribution transformers for operation in a non-sinusoidal load environment. Reference [56] is concerned with the effect of both harmonic voltage and current distortion on power transformer loss of life. The influence of possible dc current components is also taken into account.…”

Section: Effects Of Harmonicmentioning

confidence: 99%

Power system harmonics research: a survey

Singh

2007

Int Trans Elec Energy Syst

147

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SUMMARYThe increased use of power electronic controlled equipment, such as variable speed drives, automated production lines, personal computers and non-linear electronic devices in power systems has given rise to a type of voltage and current waveform distortion called as 'harmonics'. Harmonic can be defined as the undesirable components of a distorted periodic waveform whose frequencies are the integer multiples (non-integer multiples in case of inter-harmonics, and the frequency less than fundamental frequency in case of sub-harmonics) of the fundamental frequency. Presence of these harmonics results in increased losses, equipment heating and loss-of-life, and interference with protection, control and communication circuits as well as customer loads. The research has been underway since very beginning for control of power system harmonics and to supply consumers with reliable and 'clean' fundamental-frequency sinusoidal electric power that does not represent a damaging threat to their equipment. This paper, therefore, reviews the progress made in power system harmonics research and development since its inception. Attempts are also made to highlight the current and future issues involved in the development of quality and reliable electric power technology for future applications. A list of 145 research publications on the subject is also appended for a quick reference.

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“…In recent works [2,4,5], distribution single phase transformer's declassification in a peak hourly interval is evaluated based on fundamental current and its harmonics. To prevent isolation damage of single-phase transformers, a measure of fundamental currents and its harmonics in a work cycle are necessary [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Procedure to Evaluate the Impact in Distribution Single Phase Transformers Due to Insertion of New Nonlinear Load Which Changes Daily Demand Graphs

et al. 2019

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Power electronic development determines the introduction of nonlinear devices in electric power systems. Introduction of nonlinear devices increase current harmonics in transmission and distribution power systems. Distribution transformers and feeders increase power losses and their nominal parameters are reduced. The present work introduces a procedure to evaluate maximum permissible load in single phase distribution transformers with the introduction of a new type of nonlinear load which changes daily demand graphs.

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The effect of harmonics on power transformers loss of life

Cited by 17 publications

References 6 publications

Evaluation of power transformers design for feeding nonlinear loads - comparison between theory and practice tests

Evaluation of power transformers design for feeding nonlinear loads - comparison between theory and practice tests

Power system harmonics research: a survey

Procedure to Evaluate the Impact in Distribution Single Phase Transformers Due to Insertion of New Nonlinear Load Which Changes Daily Demand Graphs

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