### Amie electrical engineering power system performance winter 2017 question paper

Amie electrical engineering winter 2017 question paper power system performance.

Iei winter 2017 power system performance question paper.

Ieindia winter 2017 power system performance question paper.

To download question paper in pdf

Click here.

Question paper

Write short notes on:

a pilot wire protection

b primary and backup protection.

Iei winter 2017 power system performance question paper.

Ieindia winter 2017 power system performance question paper.

To download question paper in pdf

Click here.

Question paper

W17:2 FN 414 (1472)

POWER SYSTEM PERFORMANCE

Time Three hours

Micimum Micros: 200

ver questions, aking ANY TWO from Group A,

го Grap B and Arom Group с.

il parts of a question 4 h etc. should be

amanvered at one place.

enver should be and the point and be supple

mented with rear sketches unnecessary long answer may

Any missing or wrong distuu be assumed suitably

getting proper justification

Figures on the right-hand side margin indicate full marks

Group A

Discuss the need to express electrical quantities in

per unit system. Explain how are the importances in

DIL are converted in one systems of buses (MVA old system) to new system (MVA new, kV new).

Compute the pe values for a given power system

comprising

Generator Gl:20 MINA 6.6KV, Xel=0.t pi

Transformer. Tn;8 MVA, 66kV/132kV, XG

0.08 pu

Transmission line LLV=1324V, impedance is

3+12)

Assume the MVA base is 50, compute the new pu

POWER SYSTEM PERFORMANCE

Time Three hours

Micimum Micros: 200

ver questions, aking ANY TWO from Group A,

го Grap B and Arom Group с.

il parts of a question 4 h etc. should be

amanvered at one place.

enver should be and the point and be supple

mented with rear sketches unnecessary long answer may

Any missing or wrong distuu be assumed suitably

getting proper justification

Figures on the right-hand side margin indicate full marks

Group A

Discuss the need to express electrical quantities in

per unit system. Explain how are the importances in

DIL are converted in one systems of buses (MVA old system) to new system (MVA new, kV new).

Compute the pe values for a given power system

comprising

Generator Gl:20 MINA 6.6KV, Xel=0.t pi

Transformer. Tn;8 MVA, 66kV/132kV, XG

0.08 pu

Transmission line LLV=1324V, impedance is

3+12)

Assume the MVA base is 50, compute the new pu

EL 42

impedance values for the above mentioned compo

nents

(c) A three phase, 20 MVA, 10kV alternator has inter

nal reactance of 5% with negligible resistance. Find

the external reactance to be connected in series with

the alternator so that the steady state current on

short circuit does not exceed 8 times the full load

current value.

2. (a) Explain the need for symmetrical component trans

formation for three phase voltages and currents.

(6) Consider a L-L fault on phases and c through a

fault impedance Zf. Calculate the expression for

fault current

(e) A three phase, four wire system has three phase

currents (RYB) as Ir= 230°, ly = 502300°

and b= 30Z180°, find the positive, negative and

zero sequence current components along with the

current in the neutral wire.

3. (a) For a 4 bus system having line reactances (and

negligible line resistances) mentioned in the Table-1,

draw the power system network and compute

S. No.

Bus (from-to) Reactance

1-3 0.15j

14 0.1)

1-2 0.2j

2-3 0.1j

24 0.15j

(0) Formulate the load flow problem and discuss how

Ybus matrix Table-I

the voltage at the oth bus is iteratively calculated

using Gauss-Siedel Method.

v7:2N: EL. 414 (1472) (Continued)

impedance values for the above mentioned compo

nents

(c) A three phase, 20 MVA, 10kV alternator has inter

nal reactance of 5% with negligible resistance. Find

the external reactance to be connected in series with

the alternator so that the steady state current on

short circuit does not exceed 8 times the full load

current value.

2. (a) Explain the need for symmetrical component trans

formation for three phase voltages and currents.

(6) Consider a L-L fault on phases and c through a

fault impedance Zf. Calculate the expression for

fault current

(e) A three phase, four wire system has three phase

currents (RYB) as Ir= 230°, ly = 502300°

and b= 30Z180°, find the positive, negative and

zero sequence current components along with the

current in the neutral wire.

3. (a) For a 4 bus system having line reactances (and

negligible line resistances) mentioned in the Table-1,

draw the power system network and compute

S. No.

Bus (from-to) Reactance

1-3 0.15j

14 0.1)

1-2 0.2j

2-3 0.1j

24 0.15j

(0) Formulate the load flow problem and discuss how

Ybus matrix Table-I

the voltage at the oth bus is iteratively calculated

using Gauss-Siedel Method.

v7:2N: EL. 414 (1472) (Continued)

(e) Explain the effect of acceleration factor on conver

gence of G-S method.

4. (a) Incremental fuel costs Rs/MWh for a plant com

prising two units is given as:

(df,lar..) -0.008P, +8 and

(af, dr. 0.0096P,+ 6.4.

Determine the saving in fuel cost in Rs/hr for the

economic distribution of load of 900 MW between

two units of plant when unit 1 delivers 400 MW and

unit 2 delivers 500 MW. Compare this with the equal

distribution of the same total load)

(6) For a plant with three generating units with outputs

Pg1, Pg2 and Pg3 and penalty factors L1, L2 and

L3 indicate how the load should be economically

distributed among these units. Derive a suitable

expression for the same.

(C) Explain briefly:

(1) Plot of input output curve for a generating unit

showing fuel input vs power output.

(ii) Penalty factor for ith plant and list the various

factors it depends on.

Group B

5. (a) Discuss the block diagram representation of

HVDC system and list the components used.

(b) Show how power flow through HVDC system can

sion for the same.

be effectively controlled. Derive a suitable express

w17:2 FN: EL 414 (1472)

(3)

(Turn Over)

gence of G-S method.

4. (a) Incremental fuel costs Rs/MWh for a plant com

prising two units is given as:

(df,lar..) -0.008P, +8 and

(af, dr. 0.0096P,+ 6.4.

Determine the saving in fuel cost in Rs/hr for the

economic distribution of load of 900 MW between

two units of plant when unit 1 delivers 400 MW and

unit 2 delivers 500 MW. Compare this with the equal

distribution of the same total load)

(6) For a plant with three generating units with outputs

Pg1, Pg2 and Pg3 and penalty factors L1, L2 and

L3 indicate how the load should be economically

distributed among these units. Derive a suitable

expression for the same.

(C) Explain briefly:

(1) Plot of input output curve for a generating unit

showing fuel input vs power output.

(ii) Penalty factor for ith plant and list the various

factors it depends on.

Group B

5. (a) Discuss the block diagram representation of

HVDC system and list the components used.

(b) Show how power flow through HVDC system can

sion for the same.

be effectively controlled. Derive a suitable express

w17:2 FN: EL 414 (1472)

(3)

(Turn Over)

to generators are rated 200 MW and 400 MW

une operating in parallel. The droop character

Neces of the governors are 4% and 3% respec

vey from no load to full load. Assuming that the

generator are operating at 50Hz at no load condi

is calculate how a load of 500 MW would be

shared between them. Calculate the system

tiequency for this loud

Determine the time of operation of a 5A, 3 sec

overcurrent relay having a current setting of 125%

supply circuit through a 400/5 Ct when the circuit

anda time setting multiplier of 0.8 connected to

curries a fault current of 4KA. Use the time vs PSM

characteristics of the relay from Table-ll below:

Table-ll

Tre 58 4.4 3.5 3 2.7 2.5 2.3

PSM 2 6 8 10 12 14 16

Daw and discuss the characteristics of reactance,

Discuss the distance protection scheme for trans

mission lines

1. Explain the Swing equation. Discuss a suitable

method for its solution

(2) Explain using suitable diagram equal area criteria

for power system stability.

(0) Asynchronous machine is connected to an infinite

bus through a double circuit line. A fault occurs at

the middle of one of the double circuit line. Draw

the power angle curves for the generator for pre

fint, during fault and post fault conditions and

comment on the system stability.

wn:2BN: EL (1472)

(Continued)

une operating in parallel. The droop character

Neces of the governors are 4% and 3% respec

vey from no load to full load. Assuming that the

generator are operating at 50Hz at no load condi

is calculate how a load of 500 MW would be

shared between them. Calculate the system

tiequency for this loud

Determine the time of operation of a 5A, 3 sec

overcurrent relay having a current setting of 125%

supply circuit through a 400/5 Ct when the circuit

anda time setting multiplier of 0.8 connected to

curries a fault current of 4KA. Use the time vs PSM

characteristics of the relay from Table-ll below:

Table-ll

Tre 58 4.4 3.5 3 2.7 2.5 2.3

PSM 2 6 8 10 12 14 16

Daw and discuss the characteristics of reactance,

Discuss the distance protection scheme for trans

mission lines

1. Explain the Swing equation. Discuss a suitable

method for its solution

(2) Explain using suitable diagram equal area criteria

for power system stability.

(0) Asynchronous machine is connected to an infinite

bus through a double circuit line. A fault occurs at

the middle of one of the double circuit line. Draw

the power angle curves for the generator for pre

fint, during fault and post fault conditions and

comment on the system stability.

wn:2BN: EL (1472)

(Continued)

Write short notes on:

a pilot wire protection

b primary and backup protection.

c arcing faults.

9. We short notes on the following

1 Single line representation of powers system

2 Unsymmetrical faults

3 Back back HVDC systems

4 Automatic voltage regulator

5 Differential protection.

9. We short notes on the following

1 Single line representation of powers system

2 Unsymmetrical faults

3 Back back HVDC systems

4 Automatic voltage regulator

5 Differential protection.

6 relay coordination

7 Calculation of circuit breaker capacity

7 Calculation of circuit breaker capacity

8 Transient stability

9 Three Zone protection

10 Different types of HVDC link.

9 Three Zone protection

10 Different types of HVDC link.

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