Discuss the desirableproperties of insulators. Explainthe causes of insulator failure dueto electrical breakdown.Each line of a three-phasesystem is suspended by a stringof three identical insulators ofself-capacitance C farad. Theshunt capacitance of connectingmetal work of each insulator toearth is 20.7 % of C while for lineit is 13.8 % of C.Calculate the string efficiency ofthe system if a guard ringincreases the capacitance to theline of metal work of the lowestinsulator to 0.25C.

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Discuss the desirable properties of insulators. Explain the causes of insulator failure due to electrical breakdown.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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Question

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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