上海意蘭可電力電子設備有限公司shanghai(編輯修改稿)
2025-07-20 04:59 本頁面
【文章內(nèi)容簡介】 lar to the leakage fluxfield. At the ends of the winding the flux field bends and the larger dimension of the rectangular conductoris perpendicular to a vector ponent of the leakage flux field. Equalizing the height of die primary andsecondary windings, which can be achieved with any winding design, reduces the concentrated eddy lossat the winding ends. Using Foil windings or multiple strands per winding reduces both eddy current loss.Stray loss occurs due to the stray flux which introduces losses in the core, clamps, tank and other iron parts.Stray loss may raise the temperatures of the structural parts of the transformer. For drytype transformersincreased temperatures in these regions do not contribute to an increase in the winding hot spot temperature. Stray losses are difficult to calculate and it is mon to assume that the losses will vary as the square of the current times the frequency (harmonic order), as shown by:C). Transformers and KfactorThere are different approaches to accounting for additional losses in selecting a transformer. Here we would suggest the way applied by transformer manufacturers in conjunction with Underwriters Laboratories in the United States, it is to calculate the factor increase in eddy current loss and specify a transformer designed to cope。 this is known as the ‘Kfactor’.Where:h = harmonic numberIh = the fraction of total rms load current at harmonic number hMany power quality meters read the Kfactor of the load current directly. Once the Kfactor of the load isknown, it is a simple
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