EE1304 Electrical Machines Laboratory – II Syllabus

EE 1304 ELECTRICAL MACHINES LABORATORY – II 0 0 3 100

AIM
To expose the students to the operation of synchronous machines and induction motors
and give them experimental skill.

1. Regulation of three phase alternator by emf and mmf methods
2. Regulation of three phase alternator by ZPF and ASA methods
3. Regulation of three phase salient pole alternator by slip test
4. Measurements of negative sequence and zero sequence impedance of alternators.
5. V and Inverted V curves of Three Phase Synchronous Motor.
6. Load test on three-phase induction motor.
7. No load and blocked rotor test on three-phase induction motor.
8. Separation of No-load losses of three-phase
induction motor.
9. Load test on single-phase induction motor

10. No load and blocked rotor test on single-phase induction motor.
P = 45 Total = 45

Detailed Syllabus

1. Regulation of three phase alternator by EMF and MMF methods
Aim
To predetermine the voltage regulation of given three phase alternator by emf and mmf methods.

Exercise
1. Obtain the open circuit and short circuit characteristics of a three phase alternator.

3. Calculate synchronous impedance from the open circuit characteristics and short circuit characteristics

4. Predetermine the full load regulation at different power factor by EMF and MMF methods and draw the graph between regulation Vs Power factor.

5. Draw the phasor diagram for EMF and MMF method.


2. Regulation of three-phase alternator by ZPF and ASA methods
Aim
To predetermine the voltage regulation of given three phase alternator by ZPF
and ASA method.


Exercise

a. Obtain the open circuit, short circuit and zero power factor lagging load characteristics.

b. To construct the Potier triangle.

c. Draw the phasor diagram for ZPF and ASA method.

d. Predetermine the full load regulation at different power factor by ZPF and ASA methods.

3. Regulation of three-phase salient pole alternator by slip test
Aim
To predetermine the voltage regulation of a given three phase salient pole
alternator.

Exercise
a. Determine the Xd and Xq of the salient pole alternator.
b. To draw the phasor diagram.
c. To predetermine full load regulation at different power factor.
4. Measurements of negative sequence and zero sequence impedances of alternators
Aim
To determine the positive, negative and zero sequence impedance of alternator.

Exercise
a. Determine the positive and negative sequence impedance by suitable test.

b. Determine the zero sequence impedance by suitable test.


5. V And Inverted V Curves Of Three Phase Synchronous Motor
Aim
To determine the V and inverted V curves of three phase synchronous motor.

Exercise
1. Synchronize the synchronous motor to the bus bar.

2. Obtain the V and inverted V curves of the synchronous motor at no load, constant input and constant output.


6. Load Test On Three Phase Induction Motor
Aim
To obtain the load characteristics of three phase induction motor.
Exercise
1. Conduct the load test on a given three-phase induction motor and draw the following curves.

1. Output Vs % η
2. Output Vs Speed

2. Output Vs Line current

3. Output Vs Slip

4. Output Vs Power factor

5. T Vs N (on separate graph sheet)


7. No Load And Blocked Rotor Test On Three-Phase Induction Motor
Aim
To conduct no load and blocked rotor test and to draw the equivalent circuit and predetermine the performance.

Exercise
1. Determine the equivalent circuit parameters.

2. Draw the circle diagram and predetermine the efficiency, torque, power factor, slip and line current for three load condition.

3. Predetermine the performance characteristics using the equivalent circuit for three load condition.

8. Separation Of No-Load Losses Of Three Phase Induction Motor
Aim
To separate the constant loss of a three phase induction motor and separate into iron loss and mechanical losses.

Exercise
1. Draw the curve voltage Vs Input and separate the constant losses into iron and mechanical loss.

2. Study the star / delta and autotransformer starters internal circuitry arrangements.


9. Load Test On Single Phase Induction Motor

Aim
To obtain the load characteristics of single phase motor by load test.
Exercise
1. Conduct the load test on given single-phase induction motor and draw the following curves.

1. Output Vs % η
2. Output Vs Speed
3. Output Vs Line current IB
4. Output Vs Slip
5. Output Vs Power factor

10. No Load And Blocked Rotor Test On Single Phase Induction Motor

Aim
To conduct no load and blocked rotor test on single phase induction motor and predetermine the performance using equivalent circuit.

Exercise
1. Determine the equivalent circuit parameters from no load and blocked rotor test.
2. To predetermine the efficiency, torque, power factor and line current using the equivalent circuit parameters.


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