Answer Posted / ramesh ravichandran

in case you want to calculate induction motor winding resistance..
to get accurate value of DC resistance, firstly do block rotor test so winding of the motor get heated up at rated current..
immediately remove AC supply lines and connect DC lines across any two phase and apply 50 percent of the rated current of the IM to get the accurate DC resistance

convert the DC resistance into AC resistance by a factor of 1.2..

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