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Transformer Core Building Factor: From Sheet Loss to Core Loss
Resumo técnico
Material certificate loss and finished-core loss describe different conditions. This video explains how joints, flux direction, cutting stress and clamping enter the transformer core building factor. Core comparisons need a common grade, thickness, loss-test method, design flux density and a stated basis for the selected factor.
Transcrição
Certificate specific loss times core mass is only a starting point. Sheet tests do not reproduce production joints and assembled clamping. At corners, flux crosses gaps and transfers between laminations. At a three-phase T-joint, its direction changes. Cutting and clamping also change the stress state. A building factor connects material performance to the finished core. The article gives about one point one to one point three for three-phase step-lap cores, depending on design and manufacture. It is not a universal constant. Compare quotations using material grade, thickness, the named loss-test method, and the building factor with its basis. Then compare calculated loss at the design flux density.