j0.1j0.2 ()j0.1j0.2j0.8FIGURE 9.1j0.4 j0.4The impedance diagram of a simple power system.3产产 The one-line diagram of a simple three-bus power system is shown in Figure9.1. Each generator is represented by an emf behind the transient reactance. Allimpedances are expressed in per unit on a common 100 MVA base, and for sim-plicity, resistances are neglected. The following assumptions are made.(i) Shunt capacitances are neglected and the system is considered on no-load.(ii) All generators are running at their rated voltage and rated frequency withtheir emfs in phase.Determine the fault current, the bus voltages, and the line currents during thefault when a balanced three-phase fault with a fault impedance Zf = 0.16 per unit%3Doccurs on Bus 3.

In a balanced fault i.e. LLL or LLLG fault, the current in each phase will be same. Hence, fault…

Answered: j0.1 j0.2 (O j0.1 j0.8 j0.2 FIGURE 9.1…

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j0.1 j0.2 (O j0.1 j0.8 j0.2 FIGURE 9.1 2 j0.4 j0.4 The impedance diagram of a simple power system. 3

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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Question

j0.1
j0.2 ()
j0.1
j0.2
j0.8
FIGURE 9.1
j0.4 j0.4
The impedance diagram of a simple power system.
3
产产

The one-line diagram of a simple three-bus power system is shown in Figure
9.1. Each generator is represented by an emf behind the transient reactance. All
impedances are expressed in per unit on a common 100 MVA base, and for sim-
plicity, resistances are neglected. The following assumptions are made.
(i) Shunt capacitances are neglected and the system is considered on no-load.
(ii) All generators are running at their rated voltage and rated frequency with
their emfs in phase.
Determine the fault current, the bus voltages, and the line currents during the
fault when a balanced three-phase fault with a fault impedance Zf = 0.16 per unit
%3D
occurs on Bus 3.

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