3. A three-phase fault occurs at bus 2 of the two-bus power system given below. Determine total fault current by using Z-bus (bus impedance) matrix method and fault current supplied by each generator. Please ignore pre-fault loading conditions and choose base power as 15 MVA and base voltage at the generators side as 11 kV (.

3. A three-phase fault occurs at bus 2 of the two-bus power system given below. Determine total fault current by using Z-bus (bus impedance) matrix method and fault current supplied by each generator. Please ignore pre-fault loading conditions and choose base power as 15 MVA and base voltage at the generators side as 11 kV (.

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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A hydro powered 50 MVA generator, with a synchronous reactance 0.33 p.u., delivers 40 MW over a transmission line of 0.15 p.u. reactance to an infinite system. A 3-phase short circuit transient fault occurs on the busbar between the generator and transmission line. Given that the generator emf is 1.4 p.u. prior to and during the fault and all reactances are to a 50 MVA base: Sketch the single line schematic diagram of the system. Determine the maximum load angle the generator can swing to without losing stability. i) ii) iii) iv) Sketch the corresponding power-angle curve for the system showing the accelerating and decelerating areas. Calculate the critical clearing angle of the system to keep its stability.
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.
At a 220 kV substation of apowersystem, it is given that the three-phase fault level is 4000 MVA and single-line toground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances ofthe system The positive sequence driving pointeactance at the bus is:
The positive sequence reactance for the power system shown in Figure below are in per unit on a common MVA base. Resistances are neglected and the negative sequence impedances are assumed to be the same as the positive sequence impedances. A bolted line to line fault occurs between phase 'b' and phase 'c' at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. (i) Obtain the positive sequence bus impedance matrix. (ii) Find the fault current, the three phase bus voltages during fault at all the buses. (iii) Find the three phase currents through the transformer T1 during the fault. 2 3 XL1 X= j0.05 (G1 X= j0.05 G2 XT1 XT2 XL2 4 XT1 XL1 X12 XT2 jo.15 jo.25 jo.5 jo.15
In symmetrical fault occurs at bus-4 without fault impedance, and it is found that the phase fault current is same in all the phases. According to you is this statement true or false?
Subtransient fault current in per-unit and in kA, per-unit L-G Voltage at bus 1?
During fault between two phases, the voltage drops across zero sequence impedance is Select one: O a. Independent of positive and negative sequence voltages O b. Equal to Negative sequence voltage O c. Equal to Positive sequence voltage O d. Equal to Positive sequence voltage, and negative sequence voltage
At a 220 kV substation of apowersystem, it is given that the three-phase fault level is 4000 MVA and single-line toground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances ofthe system The positive sequence driving pointeactance at the bus is:
the positive , negative and zero sequence reactance of a 20mva,13.8kv synchrounous generator are 0.3pu, 0.2pu,and 0.1 pu respectively. the generator is solidly grounded and is not loaded. a line to ground fault occurs on phase a. neglect all resistance,detirmine the fault current.
True Or Fulse ???
Given Zo = 0.199290° pu, Z, = 0.175/90° pu, Z₂ = 0.175290° pu, compute the fault current and voltages for a Single line-to-ground fault. Note that the sequence impedances are in per-unit. This means that the results for current and voltage will be in per-unit.
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