University of Mumbai 2008-8th Sem B.E Electrical and Electronics Engineering Static Var System Old - Question Paper

Static Var System Old Course Sem VIII May 2008

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c/ Con. 2981-08.    {OLD COURSE)    CO-3692

vS    (3 Hours)    [Total Marks: 100

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N.B. :{1) Question No. 1 is compulsory.    rlr-

(2)    Attempt any four questions from the remaining six questions.

(3)    Assume suitable data if necessary.

1.    Explain the following

(a)    Mid-point Compensation.    5

(b)    Operation, Configuration and V-l Characteristic of Combined 5 TCR/TSC Compensator.

(c)    Concept of Unified Power Flow Controller.    10

2.    (a) Explain load balancing using compensators, in a three phase system. 10 (b) Explain the importance of symmetrical transmission line with specific reference 10

to mid-point compensation.

3.    (a) Explain the behaviour of an open circuited line connected with a shunt 10

reactor at the open end.

(b) Explain Flicker control and reactive power compensation in arc furnaces. 10

4.    (a) Draw the ideal compensator characteristic and explain the following 10

terms

(i)    Knee-point voltage; V_k

(ii)    Max. or rated reactive power; Q_rmax

(iii)    Compensator gain; k_r

(iv)    Stiff-system.

(b) Define voltage sensitivity and derive an expression for voltage sensitivity 10 in terms of system shortcircuit level and compensator gain.

5.    Explain different types protection schemes and cooling systems for thyristors 20 used in various types of compensators arid controllers.

6.    (a) Explain the sources and effects of harmonics on the performance of electrical 10

systems.

(b) Explain the following terms

(i)    Surge impedance loading    5

(ii)    Synchronous voltage source.    5

1

Explain the following

(a)    Dynamic Compensation    8

(b)    Reactive power bias    6 (c Ferranti-effect.    6

Attachment: university-of-mumbai-2008-b-e-electrical-and-electronics-engineering-51124-1.pdf

Earning:   Approval pending.