No. of Pages:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER SEMESTER M. TECH DEGREE EXAMNATION, DECEMBER 2017

Electrical and Electronics Engineering

Power Systems

OIEE7411: EHVAC and DC Transmission /
Answer any twofull questions from each part
Limit answers to the required points.

Max. Marks: 60 Duration: 3 hours
PARTA

1. 3. Explain the schematic diagram ofa typical HVDC converter station and derive 6the

expression for power at rectifier end, inverter end and power loss in the 60 circuit.

b. Give the economic comparison of HVAC and HVDC beansmission system 3
2. ചു. With necessary diagrams explain the operation of 12 pulse bridge converter 6 with
overlap angle.

b. Explainthe constant current control method used with HVDC converters with 3 a
schematic diagram

3. ദ. Discuss constant minimum ignition angle control in HVDC converters 4

‎With schematic diagrams, explain different types of HVDC transmission 5 systems and‏ .م
‎discuss their relative merits and demerits‏

‎PART B

‎4. 2. Drawand explain configuration of sea electrode. Compare the sea electrode 6 with
shore electrode

‎b. Write notes on DC lightning arresters. 3
5. a. Write short notes on DC harmonic filter. 3
b. Discuss reactive power requirements in HVDC substayons 6

‎6. a. Explain the significance of Short Circuit Ratio whi.le planning HVDC links. 5 0. Discuss
the Uoubles caused by ear&l currents in HVDC systems. Also explain 4 remedial
measures

‎PART C