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INDUCTION MOTOR No-load and blocked rotor tests

SEE 3433 MESIN ELEKTRIK. INDUCTION MOTOR No-load and blocked rotor tests. NO-LOAD AND BLOCKED ROTOR TESTS. Tests performed to determine the per phase equivalent circuit. - conducted in SEE 3742. Equivalent to open circuit and short circuit tests in transformers. T. Operation at no-load,

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INDUCTION MOTOR No-load and blocked rotor tests

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  1. SEE 3433 MESIN ELEKTRIK INDUCTION MOTORNo-load and blocked rotor tests

  2. NO-LOAD AND BLOCKED ROTOR TESTS Tests performed to determine the per phase equivalent circuit - conducted in SEE 3742 Equivalent to open circuit and short circuit tests in transformers

  3. T Operation at no-load, s very small  NO-LOAD AND BLOCKED ROTOR TESTS No-load test - No mechanical load applied - Machine run at rated voltage and frequency - Power and current measured

  4. NO-LOAD AND BLOCKED ROTOR TESTS No-load test - No mechanical load applied - Machine run at rated voltage and frequency - Power and current measured Operation at no-load, s very small R2’/s >> Xm Losses is only due to rotational

  5. NO-LOAD AND BLOCKED ROTOR TESTS No-load test INL + VNL  RNL jXls jXm ZNL obtained from VNL and INL RNL obtained from measured power Therefore Xls + Xm can be calculated

  6. NO-LOAD AND BLOCKED ROTOR TESTS Blocked-rotor test • - Rotor is locked or blocked (does not move, m = 0) • Voltage at Frequency at reduced frequency applied so that • rated current flows • - Power measured

  7. NO-LOAD AND BLOCKED ROTOR TESTS Blocked-rotor test IBR X’ls X’lr + VBR  Rs R’r RBR = R1+R2’obtained from measured power,, hence R2’ determined ZBR calculated and XBR = Xls + Xlr’ can be determined Assuming Xls = Xlr’ , Xm can be calculated

  8. NO-LOAD AND BLOCKED ROTOR TESTS SEE EXAMPLE 5.3

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