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A study of the current transformers with particular reference to iron loss (eBook)

by NIST Research Library(Author)

• 13,192 Words

It is shown that while the transformation ratio of current transformers usually decreases with increasing current, it may increase in individual cases or even attain a maximum. This ratio and the phase-angle at various loads can be accurately computed from the magnetic data of the core. The slope of the ratio curve can in general be qualitatively predicted from the value of the Steinmetz coefficient. But the iron losses, especially at low flux densities, cannot be accurately- represented by a simple Steinmetz formula, and so the errors are appreciable. Tho slope of the ratio curve can be accurately computed from the slope of the curve obtained by plotting the core loss against

It is shown that while the transformation ratio of current transformers usually decreases with increasing current, it may increase in individual cases or even attain a maximum. This ratio and the phase-angle at various loads can be accurately computed from the magnetic data of the core. The slope of the ratio curve can in general be qualitatively predicted from the value of the Steinmetz coefficient. But the iron losses, especially at low flux densities, cannot be accurately- represented by a simple Steinmetz formula, and so the errors are appreciable. Tho slope of the ratio curve can be accurately computed from the slope of the curve obtained by plotting the core loss against

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