Routine test of induction motor<\/h3>\n\n\n\nThe following Tests are related specifically to three-phase induction motors.Most of the necessary data are obtained from the no-load and short-circuit tests.<\/p>\n\n\n\n
No load: <\/strong>The motor is run on no load at rated voltage and frequency, and the current and power input are measured. <\/p>\n\n\n\n
The input power supplies core and mechanical losses plus the stator I2<\/sup>R loss; the rotor I2<\/sup>R loss on no load can be neglected.<\/p>\n\n\n\n
Short circuit (locked rotor):<\/strong> The short-circuit current and power are measured by holding the rotor stationary and applying a low voltage to the stator, it being usual to adjust the voltage to obtain full-load current. <\/p>\n\n\n\n
In the case of a cage motor the starting torque may also be measured. <\/p>\n\n\n\n
If the motor is connected for star-delta starting, the actual starting current and torque may be measured direct. <\/p>\n\n\n\n
The short circuit current at full voltage is calculated by assuming the current to be proportional to voltage, although on some machines the short-circuit current is actually higher because
the leakage. <\/p>\n","protected":false},"excerpt":{"rendered":"
Testing of Three Phase Induction motor after manufacture or after installation on site are made in accordance with standard Specifications. … <\/p>\n