Power system Inductance Example• Calculate the per phase inductance and reactance ofa balanced 30, 60 Hz, line with horizontal phasespacing of 10m using three conductor bundling witha spacing between conductors in the bundle of0.3m. Assume the line is uniformly transposed andthe conductors have a 1cm radius.lomlom0.3 mAnswer: D = 12.6 m, R,= 0.0889 mInductance = 9.9 x 10-7 H/m, Reactance = 0.6 Q/Milem

Given 3 phase 60 Hz, r=1 cm=10-2 m

Answered: • Calculate the per phase inductance…

Engineering

Electrical Engineering

• Calculate the per phase inductance and reactance of a balanced 30, 60 Hz, line with horizontal phase

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.23P

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Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

Power system

Inductance Example
• Calculate the per phase inductance and reactance of
a balanced 30, 60 Hz, line with horizontal phase
spacing of 10m using three conductor bundling with
a spacing between conductors in the bundle of
0.3m. Assume the line is uniformly transposed and
the conductors have a 1cm radius.
lom
lom
0.3 m
Answer: D = 12.6 m, R,= 0.0889 m
Inductance = 9.9 x 10-7 H/m, Reactance = 0.6 Q/Mile
m

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