940 B
940 B
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Find the $Z_{motor}$(normal operation)
Z_{motor}={V\over FLA}={480V\over 21A}\ 22.86\Omega<31.79^\circ -
Find the
Z_{motor}(locked rotor)Z_{motor}={V\over LRA}={480V\over 116A}\ 22.86\Omega<31.79^\circ -
Find the
R_{motor}and $X_{motor}$(normal operation)
R_{motor}=22.86\Omegacos(31.79^\circ)\ R_{motor}=19.43\Omega\ jX_{motor}=j22.86\Omegasin(31.79^\circ)\ jX_{motor}=j12.04\Omega -
Find the
R_{motor}and $X_{motor}$(locked rotor)R_{motor}=19.43\Omega -
Find the
X\over Rfor locked and normal operation{X\over R}={12.04\Omega\over 19.43\Omega}=0.6197\ {X\over R}={X\over19.43\Omega}= -
Determine base power (
S) like we did for per unit calculations on transformers -
Find the impedance base value
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Find the %impedance