No. of Pages:2 SLOTA

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

THIRD SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 201 8
Branch: Electrical and Electronics Engineering Stream(s)

1.۲۱۷۷۲۲ Systems

2. Power System and Control
3. Power Control and Drives
4. Electrical Machines

OIEE7411 EHV AC 8 DC Transmission Answer any
two full questions from each part

Limit answers to the required points.

Max. Marks: 60 Duration: 3 hours
PARTA

1. 2. Give a typical configuration of an EHC AC transmission line and explain the

various parts. (6marks)

b. State the merits of HVDC as compared to EHVAC for bulk power transmission
(3marks)
2. a. A bipolar two terminal HVDC link is delivering LOOOMW at + 500 kV at the receiving
end. Total losses in the DC circuit are 60MW. Calculate the following. (i) Sending end

power. (ii) Power in the middle of the line. (iii) Sending end voltage (iv) voltage at
middle of line(v)Total resistance of the DC Circuit (Smarks)

b. What are the different types of links used in HVDC transmission system
(4marks)

3. a.Whatare the advantages of system interconnections? (3 marks)

b. Explain the technical advantages of using HVDC for system interconnections
over EHV-AC interconnections (6 marks)

PART B
a. What are the problems associated with injection of harmonics in the AC
System by HVDC Converters. (4 marks)

b. Sketch a single line diagram of an HVDC substation indicating DC smoothing
reactor, damping circuit, DC shunt filter and DC surge capacitors. Explain the
function of these equipment (5 marks)

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