Figure 1 shows a generating station feeding power to a system. This line is 200 km long.What is the total fault current when the system experiences three-phase symmetrical fault at the receiving end of the bus? Usethese base values: 126 MVA, 19 kV at the generator side, and 149 kV for the feeder sideGenerator 1 ratings:126 MVA, 19 kV, jo.19Generator 2 ratings:90 MVA, 19 kV, jo.12Transformer 1 ratings:126 MVA, 19/149 kV, jo.1Transformer 2 ratings:90 MVA, 19/149 kV, jo.09Transmission line 1 rating:0.2 ohm per phase per kmTransmission line 2 rating:0.7 ohm per phase per km ...T1XLT(GIXL2TzG23

Answered: Image /qna-images/answer/2c8690ca-03a1-46cb-840c-b204db9a1633.jpg

Answered: Figure 1 shows a generating station…

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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j0.2 For the following power system the impedance matrix is given below. Initially all bus voltages are 1 pu. Then a three-phase fault occurs at bus (2). j0.25 j0.2 (3) (1) j0.1 : (a) What is the fault current? (2) j0.125 j0.1 (b) What are the post-fault bus voltages? 3. 0.0625 0.02083 0.02083' Zbus 0.02083 0.07044 0.02282 0.02083 0.02282 0.06091
8
For the following single line diagram of a three-phase system, a three-phase fault occurs at point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault current in pu and original value at point P. Take, the given kVA and kV of the G1 as the new base. [hint: the transient and sub-transient reactances of the synchronous generators are assumed to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient reactance.] 20,000 KV A 6.9KV I5メ G1 yo00 KVA 14% 5KV M Tz (G2 11/33KV 33/69 AV lond 5+j8 2 20000KVA 15070 KVA 10% 12% 25,000 KVA 6.9KV [AH the mpedances are given per-unit values) 8% as orebtraen sient ww
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.
Q2\ The one-line diagram of a simple power system is shown in figure below. All impedances are expressed in per unit (pu) on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage. A three-phase fault occurs at bus 1 through a fault impedance of Zf = j0.08 per unit. Using Thevenin's theorem obtain the impedance to the point of fault and the fault current in per unit. Determine the bus voltages and line currents of generators during fault. X₁ = = 0.1 XT-0.1 3 1 to ojo XL=0.2 2 040 X₁ = 0.1
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.
(b) A 30000 kVA, 13.8 kV generator with X = 18% is connected to a bus which supplies two identical motors as shown in the Figure 2. The subtransient reactance X of each motor is 25% on a base of 6000 kVA, 7 kV. The bus voltage at the motors is 7 kV when a three phase fault occurs at the point P. For the fault specified, determine (a) the subtransient current in the fault (b) the subtransient current in breaker A and (c) the symmetrical short circuit interrupting current in the fault and in breaker A. юю DO A P 0-0 Gen. Figure 2 Motors

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