TAGORE ENGINEERING COLLEGE Rathanamangalam, Chennai-48

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

HIGH VOLTAGE DIRECT CURRENT TRANSMISSION

VIII SEM / IV YEAR

UNIT 2 QUESTION BANK

PART A

1. Define “valve utilization factor” of a converter.

2. State the constraints that can be applied for determining the boundary conditions in the

detailed analysis of converters.

3. Draw the output voltage Vs firing angle characteristics of a three phase rectifier.

4. What is the twelve pulse converter?

5. Sate the effect of source reactance on a twelve pulse converter without AC filters.

6. What is pulse number of a converter?

PART B

1. Explain the complete analysis of six pulse gratez converter circuit with overlap for two

value and three valve conduction mode.

2. Describe the six pulse converter bridge characteristics as rectifier and explain the

difference modes of operation of a 12 pulse converter for rectification.

3. With a neat diagram and waveforms explain the 6 pulse Gratez’s circuit.

4. Discuss about the selection of converters for any HVDC system.

5. Draw and explain the characteristics of a twelve pulse converter.

6. Explain why the gratez circuit is considered to be the best circuit for a six pulse converter.

7. Describe the rectifier characteristics of a six pulse converter bridge.

8. State the assumptions made in the simplified analysis of gratez circuit. Explain the analysis

of two valve and three valve conduction modes of gratez circuit.