Transformer Harmonics and Their Distribution

Dahl, Ola

doi:10.1109/t-aiee.1925.5061167

Cited by 12 publications

(2 citation statements)

References 23 publications

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“…In early power networks harmonics typically came from the generator or saturation of magnetic components such as transformers [55], [56]. These issues were mostly overcome by the machine design methods described in Section 2.…”

Section: Harmonic Reduction For Distributed Generation and Renewablesmentioning

confidence: 99%

Harmonic reduction methods for electrical generation: a review

Fallows

Nuzzo

Costabeber

et al. 2018

IET Generation, Transmission & Distribution

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This paper provides a comprehensive literature review of techniques for harmonic related power quality improvement of electrical generation systems. An increasing interest in these aspects is due to the ever more stringent power quality requirements, deriving from new grid codes and compliancy standards, aimed at limiting waveform harmonic distortion at all points of the distribution network. Although a wealth of literature is available for such techniques, it has never been compiled into a handbook incorporating all the solutions aimed at both electrical machine and power systems engineers. IntroductionIn the world of electrical power generation, a main point of consideration has always been to achieve adequate performance in terms of power quality. In this context, an important factor is the generation, management and reduction/compensation of spatial and time harmonics throughout the whole power system. From the first developments in the mid-1800s of electrical power generation and distribution systems, harmonic content improvement and reduction has evolved from a localised generator design problem to an internationally regulated supply characteristic that must be considered at all points of the power distribution network.This paper is thus aimed to be a review of harmonic improvement techniques and methodologies, organised to follow and indicate the development timeline of these methods. Distribution level generation has been chosen as the focus to align with recent changes in grid topology caused by distributed and renewable generation. In this section, the paper begins by detailing the changing nature of power quality in distribution networks followed by a description of the main types of power quality issues and an overview of the key standards governing network limits. The focus then shifts to harmonic reduction procedures and methodologies. A review of harmonic reduction methods based around the design of rotating electrical generators is developed, followed by a review of modern methods applied to new generation systems, such as renewable sources.

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Section: Harmonic Reduction For Distributed Generation and Renewablesmentioning

confidence: 99%

Harmonic reduction methods for electrical generation: a review

Fallows

Nuzzo

Costabeber

et al. 2018

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…Conventionally, two winding delta-star transformers are used for electric power distribution. The primary delta winding of the transformer provides a closed circulating path for the harmonic currents which are injected due to the non-linear loading of the transformer secondary [1]. These circulating harmonics result in loss of energy as heat and eventually reduce the transformer life [2]- [5].…”

Section: Introductionmentioning

confidence: 99%

Modified Distribution Transformer for Enhancing Power Quality in Distribution Systems

Preetha¹,

Nair²

2016

IJPEDS

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<p>The percentage of non-linear loads in the power distribution sector is increasing day by day. Harmonics injected by these non-linear loads circulate in the delta windings of the conventional distribution transformer thereby increasing the temperature and losses. This reduces the efficiency and life of the transformers. In a modified distribution transformer configuration proposed recently, called star-star-delta_utilized configuration (YYD_utilized), the harmonics circulating in the delta winding was utilized and the drainage power thus recovered was used to power auxiliary loads. This paper presents the experimental studies conducted on YYD_utilized distribution transformer. When compared to conventional star-star, delta-star and star-star-delta transformers, the new configuration of YYD_utilized transformer has shown considerable improvement in transformer efficiency. The results obtained show that when the power from the circulating harmonics is recovered and utilized, it not only improves transformer efficiency but also improves the power factor and reduces the harmonic distortions at the primary side of the transformer. The results obtained also suggest the existence of maximum power point or an optimum loading for the recovered harmonic power.</p>

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Magnetische Sättigung in ruhenden Stromkreise

Rüdenberg

1953

Elektrische Schaltvorgänge in Geschlossenen Stromkreisen Von Starkstromanlagen

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Transformer Harmonics and Their Distribution

Cited by 12 publications

References 23 publications

Harmonic reduction methods for electrical generation: a review

Harmonic reduction methods for electrical generation: a review

Modified Distribution Transformer for Enhancing Power Quality in Distribution Systems

Magnetische Sättigung in ruhenden Stromkreise

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