Q. when a three-phase fault occurs at 75% of the distance from bus G.This fault has 10 arc resistance.100 MVA, 115 KV Line GHa-Assume that the angle of the mho characteristic is 70°.Determine if thezone I mho unit at H set for 90% of the line GH can operate for this fault.b-Determine the apparent impedance seen by the distance relays at Hfor this fault.GZ, = 0.365 Z83° -80%l6 = 1.96 Z–31.42°4 = 2.60 Z–47.76°ķ = 4.51 Z-40.68°All values in per unit on 100 MVA, 115 kV.

A three-phase fault occurs at 75% of the distance from bus G as shown in figure The fault has 10 arc…

Answered: Q. when a three-phase fault occurs at…

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
The LLLG fault occurs at bus-8with pre-fault voltage as 1.02 p.u. If the positive sequence impedance at bus-8 is j0.15 and positive sequence current is -j1.125. which one of the following values will be the value of zero sequence voltage at bus 8? Select one: a. 1.3125 O b. 0 O c. 0.7587 O d. 0.3125
Please solve Q1(C) ONLY. Q1(A) is for reference.
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.
(Q.2) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF.) in pu and in kA, and fault MVA (ie. short-circuit level) at the indicated locations. Internal reactance of generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side. 113.3 kV 4 MVA, 7% j0.5 2 j0.4 2 300 A 200 A 11 KV 250 MVA
Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence current in phase 'c' is
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?
B1
Explain the concept of fault analysis in power systems. What are the different types of faults, and how are they analyzed and mitigated?
The negative sequence current of a solidly grounded generator for single line to ground fault is j 2.5 p.u. Then the positive sequence current during the fault is equal to o j7.5 pu o jo.75 pu o j2.5 pu o jo.25p.u
The series fault is equal to : -open conductor fault -Line-to-Line fault -Double Line-to-Ground fault -Line-to-ground fault
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.

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