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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Similar questions

Single line to ground fault is one type of the symmetrical fault. Select one: True False
A 3-phase, 3-wire system has a normal voltage of 10.4 kV between the lines. It is supplied by a generator having positive, negative and zero sequence reactances of 0-6, 0.5 and 0.2 per phase respectively. Calculate the fault current which flows when a line-to-line fault occurs at the generator terminals.
D3.
Consider the single-line diagram of a power system shown below. The transient reactance of cach part of the system is as shown in table and expressed in p.u. on a common 100 MVA base. A three-phase fault with impedance of 0.16 p. occurs at bus (5). Determine short- circuit capacity (fault level) and short circuit current? Assume the fault voltage at bus (5) equal 112 KV
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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?
The 60 mile, 115 kV line GH (Figure P12.8) is operating with the voltages ateach end 30° out of phase when a three-phase fault occurs at 80% of the distance from bus G. This fault has 12 Ω arc resistance. The currents flowing tothe fault are as shown and are in per unit at 100 MVA, 115 kV.d. Determine if the zone 1 mho unit at H set for 90% of the line GH can operate for this fault. Assume that the angle of the mho characteristic is 75°.e. Describe how this three-phase fault can be cleared by the line distance relays.
8
The speed of circuit breaker is defined as the time between the occurrences of the fault to the extinction of the arc. True False
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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.

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