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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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.
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
A 50 MVA, 11 KV three-phase alternator was subjected to a different types of faults. The fault current REN Art (1) 1870 A. for three-phase fault. (ii) 2590 A. for L-L fault. *VE ve. -Ve AV19 (iii)4130 A. for L-G fault. The alternator neutral is solidly grounded. Find the three sequence reactance's of the alternator. X., X., X +V., -ve, ve
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.
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(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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