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State and explain the importance of considering complex power flow (P+jQ) for planning an EHV transmission link. Why intermediate substations are necessary for long AC transmission.
Discuss the phenomenon of corona and its formation in detail.
What are the different FACT devices which are commonly used? Explain briefly the difference between series and shunt controllers.
State the significance of reactive power compensation and its influence on voltage' stability and voltage profile.
Explain the Graetz Circuit operation and derive the output dc voltage. Support your answer with appropriate diagrams/waveforms.
Write the short notes on (a) Energisation and De-energisation of a bridge, (b) control system for HVDC converters, (c) Firing angle control.
Mention the various sources of harmonic generation in HVDC systems and suggest the methods to eliminate them.
Explain various kind of DC links with their characteristic support your answer with appropriate diagram.
(a) Compare EHV AC and HVDC transmission system.
(b) What are the different parameters on which selection of high voltage of transmission line depends?
(c) Explain Sphere gaps for high voltage measurement.
(d) Briefly explain the power converter circuits associated with HVDC systern.
(e) What are the advantages of homopolar HVDC link over other type of links?
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