Dr.A.P.J.Abdul Kalam University BE VII SEM ALL BRANCH HVDC Transmission [EX-702] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Seventh Semester Main Examination, Dec-2020

HVDC Transmission [EX-702]

Branch: EX

Time: 3:00 Hrs Max Marks 70

Note : 1. Attempt any five questions out of eight.

2. All question carry equal marks.

Q.1 (a) What are the Modern trends in D.C. Transmission? Discuss in brief.

(b) Discuss the Application of DC Transmission System.

Q.2 (a) What are the characterstics of characteristics of 6 Pulse & 12 Pulse converters?

(b) What are the Cases of two 3 phase converters in star–star mode?

Q.3 (a) What are the operations of Graetz circuit and derive expression for output

 voltages?

 (b) What are the Effect of source inductance on the system? Explain in detail.

Q4 (a) Explain various kinds of DC link?

(b) Explain typical HVDC converter station with schematic diagram?

Q.5 (a)What are the protection against over current and over voltage in converter station?

(b)Explain in detail: surge arresters, smoothing reactors. Corona effects on DC lines.

Q.6 (a)What are the causes of harmonics in HVDC system? Explain the adverse effects in HVDC

system.

(b) Explain in detail-Design of Single tuned filters, Design of High pass filters?

Q.7 (a) What is the effect of Pulse number on harmonics? Explain in detail?

(b)Explain: -Simultaneous method and Sequential method.

Q.8 Write a short note on (any 3)

Comparison of AC &DC Transmission

Types of HVDC Links

Firing angle control

Current and extinction angle control

Attachment & Scanned Copies:

Share This