Download AKTU B-Tech 8th Sem 2016-17 Ehv Ac And Dc Transmission Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2016-17 Ehv Ac And Dc Transmission Question Paper

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T ime :
Note :
B. TECH.
THEORY EXAMINATION (SEM?VIII) 2016-17
EHV AC& DC TRANSMISSION
3 Hours Max. Marks : 100
Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
Attempt all of the following questions: 10 x 2 = 20
(a) Define audible noise.
(b) Define corona.
(c) Write standard transmission voltage.
(d) Why HVDC system is best for EHV AC system?
(e) Write the names of filters used in the HVDC system.
(1) What do you understand by surface voltage gradient?
(g) Define impulse generator.
(h) Define the significance of impulse tests.
(i) Define ?ash over and 50% ?ash over voltage.
(j) What are the causes of over currents?
SECTION ? B
Attempt any ?ve of the following questions: 5 x 10 = 50
(a) What are the causes of over voltage in converter station? How would you protect the
converter station equipment from these over voltage?
(b) Derive an equation for calculating the maximum electric intensity on the conductor
surface of a three phase single circuit horizontal con?guration line with two sub
conductor per phase.
(c) Explain mechanical consideration in transmission line.
(d) What are the methods are used reducing the switching surge in EHV line?
(e) Explain the Damper and Spacers EHV AC-DC system.
(1) Discuss the design aspect of EHV lines, design factor under steady state condition.
(g) For r=lcm, H=5m, f=50Hz, calculate corona loss PC according to peek's formula when
E=1.1E0 and 5:1
(h) Discuss corona pulses, their generation and properties
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
What do you meant by MTDC system? What are the different types of MTDC system? Explain
and compare each type of MTDC system.
What are Explain the voltage multiplier circuits. Also explain the cascade connection of
transformer for producing very high ac voltages
Discuss method of measuring high impulse currents. Discuss in detail about Sphere Gap
measurements. What are its advantages and limitations for high voltage measurement?
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