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Experiment 3

The document outlines Experiment No. 3, which focuses on simulating short circuit faults in a power line using PSPICE. It provides a detailed circuit file and simulation steps to study the behavior of the circuit, including observations on the fault current. The report should discuss the presence of a DC component in the fault current and the absence of high-frequency oscillations.

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abedul.hadi
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11 views2 pages

Experiment 3

The document outlines Experiment No. 3, which focuses on simulating short circuit faults in a power line using PSPICE. It provides a detailed circuit file and simulation steps to study the behavior of the circuit, including observations on the fault current. The report should discuss the presence of a DC component in the fault current and the absence of high-frequency oscillations.

Uploaded by

abedul.hadi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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Experiment No: 3

EXPERIMENT NAME: SHORT CIRCUIT FAULT SIMULATION

Objective: Study the behavior of a power line at short circuit faults.

A short distance power line may be represented by simple R-L series impedance. The short
circuit is caused by switch U2 as shown below.

Write down the PSPICE circuit file as follows. Then simulate it and study its behavior.

PSPICE circuit file:

* Circuit file description


V_V1 $N_0001 0 DC 0 AC 0
+SIN 0 240 50 0 0 90deg
L_L1 $N_0002 $N_0003 1mH IC=0
R_R3 0 $N_0004 0.01
K_CT1 L1_CT1 L2_CT1 1
L1_CT1 $N_0005 $N_0006 1
L2_CT1 $N_0004 0 100
R_R1 $N_0005 $N_0002 0.01
X_U2 0 $N_0003 Sw_tClose PARAMS: tClose=37ms ttran=1u Rclosed=0.01
+ Ropen=1Meg
X_U1 $N_0001 $N_0006 Sw_tClose PARAMS: tClose=1ms ttran=1u Rclosed=0.01
+ Ropen=1Meg
R_R2 $N_0003 0 10
.tran .002us 180ms
.OP
.lib nom.lib
.probe
.END
Simulation Steps:
1. Run PSPICE text editor
2. Write the PSPICE codes

Experiments developed by Rajib Baran Roy & Md. Ruhul Amin Page 1
3. Save them (Default extension is *.cir)
4. Run PSPICE.EXE (or PSPICE_AD.EXE)
5. Open the *.cir file
6. Start simulation (After simulation is over, the probe window will be open)
7. Or, Run probe.exe from the design manager. The probe window will be open.
8. Add the following traces on the probe plot
 I(R3)
 I(R1)
Change the R, L values and also the fault time and see the behavior of the circuit.

Points to note:
 There is a dc component in the fault current that decays with time.
 There is no high frequency oscillation in the fault current

Discuss in Report:

Why the dc component is coming in the fault current?


Why there is no high frequency oscillation in the fault current?

Experiments developed by Rajib Baran Roy & Md. Ruhul Amin Page 2

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