Discuss the desirable properties of insulators. Explain the causes of insulator failure due to electrical breakdown.
Discuss the desirable properties of insulators. Explain the causes of insulator failure due to electrical breakdown.
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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Transcribed Image Text:Discuss the desirable
properties of insulators. Explain
the causes of insulator failure due
to electrical breakdown.
Each line of a three-phase
system is suspended by a string
of three identical insulators of
self-capacitance C farad. The
shunt capacitance of connecting
metal work of each insulator to
earth is 20.7 % of C while for line
it is 13.8 % of C.
Calculate the string efficiency of
the system if a guard ring
increases the capacitance to the
line of metal work of the lowest
insulator to 0.25
C.
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