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Power Systems
Z-Bus Building Algorithm
The pre-fault...
Question

The pre-fault voltage are 1.0 p.u. at all buses. The system was unloaded prior to the fault.
A solid 3 phase fault takes place at bus 2.
The post fault voltages at buses 1 and 3 in per unit respectively are

A
0.24, 0.63
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B
0.31, 0.76
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C
0.33, 0.67
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D
0.67,0.33
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Solution

The correct option is D 0.67,0.33
0.67, 0.33

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Q. Statement:
For a power system the admittance and impedance matrices for the fault studies are follows.

Ybus=⎡⎢⎣−j8.75j1.25j2.50j1.25−j6.25j2.50j2.50j2.50−j5.00⎤⎥⎦

Zbus=⎡⎢⎣j0.16j0.08j0.12j0.08j0.24j0.16j0.12j0.16j0.34⎤⎥⎦

The pre-fault voltages are 1.0 p.u. at all the buses.
The system was unloaded prior to the fault. A solid 3 phase fault takes place at bus 2.

Q: The post fault voltages at buses 1 and 3 in per unit respectively are
Q. A power system has a circuit breaker connecting a large system, (initially open) to other system between bus 2 and bus 3. The system B three-phase fault level at bus 3 under the condition is unknown. After closing circuit breaker, the 3−ϕ fault level at bus 1 was found to be 6 pu. The new 3−ϕ fault level at system bus 3 after interconnection will be _______pu.(Assume prefault voltages to be 1 pu at all buses).


Q. For the configuration shown in figure the breaker connecting a large system to bus 2 is initially open. The system 3-phase fault level at bus 3 under this condition is not known. After closing the system breaker, the 3-phase fault level at bus 1 was found to be 5.0 p.u. What will be the new 3-phase fault level at system bus 3 after the interconnection? All per unit values are on common base. Prefault load currents are neglected and prefault voltage are assumed to be 1.0 p.u. at all buses.

Eg = 1.0 p.u., XT = 0.2 p.u., XLine = 0.3 p.u., Xd = 0.2 p.u.
Q. A 3ϕ SC occurs at BUS -4. The SC current flowing between buses 1 and 2 is ___
Assume that the pre fault voltage at all the buses is 1.0 Pu.

Zbus=j⎡⎢ ⎢ ⎢⎣0.150.080.040.070.080.150.060.090.040.060.130.050.070.090.050.12⎤⎥ ⎥ ⎥⎦
Q. If all the sequence voltages at the fault point in a power system are equal, then the fault is a
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