l10answer 7 and 8 7. A system operates at 220 KVA and 11 kV. Using thesequantities as base values, find the base impedance for thesystem.a. 200b. 100nc. 5500d. 34.6408. Three 6.6 kv, 12 MVA, 3-phase alternators are connected toa common bus bars. Each has reactance to positive sequencecurrent of 15%. The reactance to negative and zero sequencecurrent are 75% and 30% of the positive sequence value. Ifan earth fault occurs on one of bus bar, determine thefault current when one of the alternator neutral is earthedthrough a resistance of 0.25 ohm and the others areisolated.a. 30,813 Ab. 18,625 Ac. 23,717 Ad. 12,844 A

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7. A system operates at 220 kVA and 11 kV. Using these quantities as base values, find the base impedance for the system. a. 200 b. 100n c. 5500 d. 34.640 8. Three6.6 kV, 12 MVA, 3-phase alternators are connected to

7. A system operates at 220 kVA and 11 kV. Using these quantities as base values, find the base impedance for the system. a. 200 b. 100n c. 5500 d. 34.640 8. Three6.6 kV, 12 MVA, 3-phase alternators are connected to

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Nodal Analysis

In the analysis of any electric circuit, nodal analysis is the method of determining the potential difference or voltage between different nodes in an electric circuit. A node is a point where two or more branches connect each other. In the nodal analysis, the voltages are determined in the terms of branch currents. The nodal analysis is also known as the node voltage method or branch current method. The nodal analysis method is one of the several applications of Kirchhoff's Current Law (KCL).

Question

l10

answer 7 and 8

7. A system operates at 220 KVA and 11 kV. Using these
quantities as base values, find the base impedance for the
system.
a. 200
b. 100n
c. 5500
d. 34.640
8. Three 6.6 kv, 12 MVA, 3-phase alternators are connected to
a common bus bars. Each has reactance to positive sequence
current of 15%. The reactance to negative and zero sequence
current are 75% and 30% of the positive sequence value. If
an earth fault occurs on one of bus bar, determine the
fault current when one of the alternator neutral is earthed
through a resistance of 0.25 ohm and the others are
isolated.
a. 30,813 A
b. 18,625 A
c. 23,717 A
d. 12,844 A

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