IPQ Question Bank of Unit 1 & 2

Vision Institute Of Technology
INTRODUCTION TO POWER QUALITY AND FACTS
UNIT 1
(INTRODUCTION TO POWER QUALITY)

1. With reference to power quality explain drop out and flicker.
2. Classify the long duration voltage variations and explain them.
3. Explain short duration voltage variations and with reference to them
explain interruption, sags and swells in details.
4. Explain – Inter harmonics, notching and fluctuations.
5. Explain Active power, reactive power and apparent power.
6. Define DC offset.
7. What are the major quality issues? Explain in details.
8. Define the Following term-
a. Inrush Current
b. Power Factor
c. Non linear loads
d. Voltage imbalance.
                                                     

Vision Institute Of Technology

                  UNIT 2
                                           (Voltage Sag)

1. Differentiate between voltage sags and voltage swells.
2. What is voltage sag? Explain voltage sag and voltage swell.
3. What are the principles of voltage sag performance? Give solution at end
user level.
4. Explain fault indicators.
5. What are the sources of voltage sag? Explain in detail.
6. Explain the fundamental principle of protection to reduce the voltage sag in
detail.
7. Explain the working of different uninterruptable power supplies.
8. State and explain different mitigation methods and operational measures
to minimize the voltage disturbances of customer site.
9. Briefly explain the uses of isolations transformer, voltage regulator and
active series compensator.
10. With a typical ferro-resonant circuit diagram discuss, how a ferrousresonant transformers hands voltage sag conditions.