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Inrush Current During The Transition Of Star-delta ?


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It's not possible to do this without having motor current and torque vs speed curves and load torque vs speed curve for the driven machine.


Worst case conditions will be:


2 x current drawn just prior to transition

4 x torque produced just prior to transition.


The values are determined by motor and load characteristics and can vary quite considerably between installations.


Hoper that helps,






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