ELECTRICAL MACHINES LABORATORY - 1 (18EEL37)

ELECTRICAL MACHINES LABORATORY - 1

Subject Code 18EEL37 CIE Marks 40
Number of Practical Hours/Week 0:2:2 SEE Marks 60
Credits 02 Exam Hours 03

Course Learning Objectives:

· Conducting different tests on transformers and synchronous machines and evaluating of their performance.
· Verify the parallel operation of two single phase transformer.
· Study the connection of single-phase transformers for three phase operation and phase conversion.
· Study of synchronous generator connected to infinite bus.

1 Open Circuit and Short circuit tests on single phase step up or step down transformer and predetermination of (i) Efficiency and regulation (ii) Calculation of parameters of the equivalent circuit.

2 Sumpner’s test on similar transformers and determination of combined and individual transformer
efficiency.

3 Parallel operation of two dissimilar single-phase transformers of different kVA and determination of
load sharing and analytical verification given the Short 

4 Polarity test and connection of 3 single-phase tran scfiorrcmuietrtseisnt dsatatra.– delta and determination of efficiency and regulation under balanced resistive load.

5 Comparison of performance of 3 single-phase transformers in delta – delta and V – V (open delta)
connection under load.

6 Scott connection with balanced and unbalanced loads.

7 Separation of hysteresis and eddy current losses in single phase transformer.

8 Voltage regulation of an alternator by EMF and MMF methods.

9 Voltage regulation of an alternator by ZPF method.

10 Power angle curve of synchronous generator or Direct load test on three phase synchrous
generator to determine efficiency and regulation

11 Slip test – Measurement of direct and quadrature axis reactance and predetermination of
regulation of salient pole synchronous machines.

12 Performance of synchronous generator connected to infinite bus, under constant power and variable
excitation & vice - versa.

Course Outcomes: At the end of the course the student will be able to:

· Evaluate the performance of transformers from the test data obtained.
· Connect and operate two single phase transformers of different KVA rating in parallel.
· Connect single phase transformers for three phase operation and phase conversion.
· Compute the voltage regulation of synchronous generator using the test data obtained in the
laboratory.
· Evaluate the performance of synchronous generators from the test data and assess the
performance of synchronous generator connected to infinite bus.

Conduct of Practical Examination:

1. All laboratory experiments are to be included for practical examination.
2. Breakup of marks and the instructions printed on the cover page of answer script to be strictly adhered
by the examiners.
3. Students can pick one experiment from the questions lot prepared by the examiners.
4. Change of experiment is allowed only once and 15% Marks allotted to the procedure part to be made zero.