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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.