POWER QUALITY, ELECTROMAGNETIC COMPATIBILITY AND ...

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EJM – 054

*EJM054*

III Semester M.E. (Power and Energy Systems) Degree Examination, January 2013 (2K8 Scheme) PSEL-34 : POWER QUALITY, ELECTROMAGNETIC COMPATIBILITY AND RELIABILITY Time : 3 Hours

Max. Marks : 100

Instruction : Answer any five full questions. 1. a) How are power quality problems evaluated ?

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b) Discuss long term voltage variations which cause PQ problems.

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2. a) Define active power, reactive power, apparent power, power factor and displacement power factor under non-sinusoidal conditions.

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b) Discuss the CBMA and IITC curves used to define PQ acceptability. What is the significance of these curves ?

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3. a) Why do harmonics occur ? What is the effect of harmonics on equipment ? b) Briefly discuss how harmonics can be reduced.

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4. a) Describe the process of bench marking. Why is it necessary ?

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b) Explain the function and purpose of harmonic analyzers and spectrum analyzers.

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5. a) PQ data is voluminous. Discuss how this data can be assessed ?

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b) How can expert systems be used in PQ monitoring ? What are the key features of expert system development ?

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6. a) Briefly discuss the transducers available for PQ monitoring. What dictates the choice of transducers ?

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b) Why do flickers occur ? How are they different from notches ? How can they be measured ?

10 P.T.O.

*EJM054*

EJM – 054

7. a) Briefly discuss the indices used to quantify harmonics. Compare the merit of the indices.

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b) What are the transient types which occur ? What are the causes for transients ?

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8. a) How is power system adequacy assessed at different hierarchical levels ?

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b) Discuss the indices used to quantify reliability at the HLI (Generation) level. 10 _______________________