Analyze power system as shown in Fig. 3 subject to (a) Line to Ground bolted fault (b) Line to Line Bolted Fault occurred at bus 2. Compare values of symmetrical and unsymmetrical values of fault currents and fault voltage at fault bus under (a) Line to Ground Bolted Fault (b) Line to Line Bolted Fault. Pre-fault voltages can be assumed as 1+ 0j =1< 0° per unit. Transformers T1 and T2 have 345 Y / 20 A KV Transformation Ratio. Power Plant – I Power Plant – II (2) 3) Generator Generator Transmission Line 1

Analyze power system as shown in Fig. 3 subject to (a) Line to Ground bolted fault (b) Line to Line Bolted Fault occurred at bus 2. Compare values of symmetrical and unsymmetrical values of fault currents and fault voltage at fault bus under (a) Line to Ground Bolted Fault (b) Line to Line Bolted Fault. Pre-fault voltages can be assumed as 1+ 0j =1< 0° per unit. Transformers T1 and T2 have 345 Y / 20 A KV Transformation Ratio. Power Plant – I Power Plant – II (2) 3) Generator Generator Transmission Line 1

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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4.In a double line-to-ground fault we can expect thatImmersive reader A) There are currents in the ground connections. B) The current values in the ground connections are zero. C) Short-circuit currents exist in all three phases. D) The currents in the faulted phases are equal. E) N. A.
What type of fault is Single phase to ground fault in power system.(Symmetrical or Unsymmetrical). Discuss the chance of occurrence of the above-mentioned type of fault.
Given the network shown, for a solid three-phase fault on bus 2 (a) find the sub transient current in per unit from generator 1 and in line 1-2; (b) find the voltages at bus 1 and bus 3. Assume that no current is flowing prior to the fault and that the pre fault voltage at bus 2 is 1.0 per unit. Show your solution.
True or false 1. Three phase fault is the most commonly occurring fault than other types of faults. 2. The range of generator rotor angle for stable operation is 0°< s < 180°. 3. The infinite bus in power system is a large system with infinite voltage. 4. At value of (s= 90°) the maximum power transfer takes place. 5. Per unit system (PU) is a ratio of actual value in any units to the base or reference value in the same units.
If the source impedance at a 13.2 kV distribution substation bus is (0:5 + 1:5) Q per phase, compute the RMS and maximum peak instantaneous value of the fault current, for a balanced three-phase fault. For the system (X/R) ratio of 3.0, the asymmetrical factor is 1.9495 and the time of peak is 7.1 ms (see Problem 1). Comment on the withstanding peak current capability to which all substation electrical equipment need to be designed. Problem 1 Consider the expression for i(f) given by i(t) = v21ms [sin(@t-0-)+ sin 0,.eR/X)] where ez = tan-1 (WL/R). (a) For (X/R) equal to zero and infinity, plot i(f) as a function of (wf). (b) Comment on the DC offset of the fault current waveforms. (c) Find the asymmetrical current factor and the time of peak, tp, in milliseconds, for (X/R) ratios of zero and infinity.
[3 2 11 BUS ZBus=j|2 4 2 Ω L1 2 3]
1- Which of the following is true in decoupled load flow method a- Jacobians J1 and J2 are considered b-Jacobians J2 and J3 are considered c-Jacobians J2 and J3 are neglected d- Jacobians J1 and J2 are neglected 2-If all the three sequence currents at the fault point in a power system are equal, then the type of the fault is a.Line to line fault b.Three phase fault c.Double line to ground fault d.Single line to ground fault
Q2 (1). In Figure 2-1, two curves represent fault currents supplied by two sources in case of phase faults at different corresponding locations. Overcurrent protection 1 and 2 are designed to protect line A- B. If there is no directional element, please explain how the setting values for overcurrent protection 1 and 2 could be calculated? (2). If only one directional element is available, please explain how the setting values for overcurrent protection 1 and 2 could be calculated? A B K1 IK1 g K2 Figure 2-1 IK2
Power system analysis