1. INDUCTION MOTOR No-load and blocked rotor tests
SEE 3433
MESIN ELEKTRIK
INDUCTION MOTOR No-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. NO-LOAD AND BLOCKED ROTOR TESTS
No-load test
- No mechanical load applied
- Machine run at rated voltage and frequency
- Power and current measured T
Operation at no-load,
s very small 

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
- 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
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