Categories: 7th Semester

1/2

Seat No.: ________ Enrolment No.______________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE- VII

SEMESTER ?EXAMINATION ? SUMMER 2018

Subject code:170807 Date: 28-04-2018

Subject Name: POWER SYSTEM ANALYSIS

Time: 02:30 pm to 05:00 pm Total Marks: 70

Instructions

1. Make suitable assumptions wherever necessary.

2. Figures to the right indicate full marks.

3. Each question carry equal marks (14 marks)

Q.1

(a) Derive the per unit model of a single phase transformer. 7

(b) Define per unit system. Derive the formulae of per unit impedance with

usual notations.

7

Q.2 (a) Derive the formulae for peak to peak value of symmetrical short circuit

current for the transmission line subjected to short circuit under no load

condition.

7

(b) (b)Draw the oscillogram of an alternator subjected to symmetrical fault.

Describe the various terminology used for it.

OR

Discuss the factors affecting the selection of circuit breaker.

7

7

Q.3 (a) State the percentage occurrence of unsymmetrical fault. What is a ? With

usual notations prove that 1+ a+a

2

=0.

7

(b) Briefly explain the significance of positive sequence impedance and

positive sequence network model of alternator for fault analysis.

7

OR

Q.3 (a) (b)With usual notations prove that [Vp] = [A] [Vs].

Explain the various configuration of zero sequence networks of

transformers.

7

7

Q.4

(a) Derive the formulae for positive sequence current Ia1 when 3 phase

transmission line is subjected to double line to ground fault.

7

(b) Draw the connection of sequence network for the following cases of open

conductor fault. (i) one conductor open (ii) two conductor open

OR

7

Q.4 (a) (b)State the comparisons for various methods of load flow solutions.

Explain the fast decoupled load flow solution method .

7

7

Q.5 (a) Derive the equation of per unit value of moment of inertia for the

synchronous machine subjected to acceleration due to input feed of

mechanical energy.

7

(b) Describe equal area criterion with. Usual notations. 7 1/2

Seat No.: ________ Enrolment No.______________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE- VII

SEMESTER ?EXAMINATION ? SUMMER 2018

Subject code:170807 Date: 28-04-2018

Subject Name: POWER SYSTEM ANALYSIS

Time: 02:30 pm to 05:00 pm Total Marks: 70

Instructions

1. Make suitable assumptions wherever necessary.

2. Figures to the right indicate full marks.

3. Each question carry equal marks (14 marks)

Q.1

(a) Derive the per unit model of a single phase transformer. 7

(b) Define per unit system. Derive the formulae of per unit impedance with

usual notations.

7

Q.2 (a) Derive the formulae for peak to peak value of symmetrical short circuit

current for the transmission line subjected to short circuit under no load

condition.

7

(b) (b)Draw the oscillogram of an alternator subjected to symmetrical fault.

Describe the various terminology used for it.

OR

Discuss the factors affecting the selection of circuit breaker.

7

7

Q.3 (a) State the percentage occurrence of unsymmetrical fault. What is a ? With

usual notations prove that 1+ a+a

2

=0.

7

(b) Briefly explain the significance of positive sequence impedance and

positive sequence network model of alternator for fault analysis.

7

OR

Q.3 (a) (b)With usual notations prove that [Vp] = [A] [Vs].

Explain the various configuration of zero sequence networks of

transformers.

7

7

Q.4

(a) Derive the formulae for positive sequence current Ia1 when 3 phase

transmission line is subjected to double line to ground fault.

7

(b) Draw the connection of sequence network for the following cases of open

conductor fault. (i) one conductor open (ii) two conductor open

OR

7

Q.4 (a) (b)State the comparisons for various methods of load flow solutions.

Explain the fast decoupled load flow solution method .

7

7

Q.5 (a) Derive the equation of per unit value of moment of inertia for the

synchronous machine subjected to acceleration due to input feed of

mechanical energy.

7

(b) Describe equal area criterion with. Usual notations. 7

2/2

OR

Q.5 (a) (b) Derive the swing equation describing the rotor dynamics for synchronous

machines.

Discuss the conditions for parallel operation of generators.

7

7

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