JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Electrical Machines – I & Electrical Machines – II

Course Objectives:

• To understand the operation of synchronous machines
• To understand the analysis of power angle curve of a synchronous machine
• To understand the equivalent circuit of a single phase transformer and single phase induction motor
• To understand the circle diagram of an induction motor by conducting a blocked rotor test.

Course Outcomes

After the completion of this laboratory course, the student will be able

• Assess the performance of different machines using different testing methods
• To convert the Phase from three phase to two phase and vice versa
• Compensate the changes in terminal voltages of synchronous generator after estimating the change by different methods
• Control the active and reactive power flows in synchronous machines
• Start different machines and control the speed and power factor The following experiments are required to be conducted as compulsory experiments
• 1. O.C. & S.C. Tests on Single phase Transformer
• 2. Sumpner’s test on a pair of single phase transformers
• 3. No-load & Blocked rotor tests on three phase Induction motor
• 4. Regulation of a three –phase alternator by synchronous impedance &m.m.f. methods
• 5. V and Inverted V curves of a three—phase synchronous motor.
• 6. Equivalent Circuit of a single phase induction motor
• 7. Determination of Xd and Xq of a salient pole synchronous machine
• 8. Load test on three phase Induction Motor In addition to the above experiments, at least any two of the following experiments are required to be conducted from the following list
• 1. Separation of core losses of a single phase transformer
• 2. Efficiency of a three-phase alternator
• 3. Parallel operation of Single phase Transformers
• 4. Regulation of three-phase alternator by Z.P.F. and A.S.A methods
• 5. Heat run test on a bank of 3 Nos. of single phase Delta connected transformers
• 6. Measurement of sequence impedance of a three-phase alternator.
• 7. Vector grouping of Three Transformer
• 8. Scott Connection of transformer

TEXT BOOKS:

• 1. A. E. Fitzgerald and C. Kingsley, "Electric Machinery”, McGraw Hill Education, 2013.
• 2. M. G. Say, “Performance and design of AC machines”, CBS Publishers, 2002.

REFERENCES:

• 1. P. S. Bimbhra, “Electrical Machinery”, Khanna Publishers, 2011.
• 2. I. J. Nagrath and D. P. Kothari, “Electric Machines”, McGraw Hill Education, 2010.
• 3. A. S. Langsdorf, “Alternating current machines”, McGraw Hill Education, 1984.
• 4. P. C. Sen, “Principles of Electric Machines and Power Electronics”, John Wiley & Sons, 2007. R18 B.TECH EEE