8. Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0:3 C. Calculate the string efficiency of the arrangement : (1) with the guard ring. (ifi) without guard ring. [) 95% (ii) 86-13%]

8. Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0:3 C. Calculate the string efficiency of the arrangement : (1) with the guard ring. (ifi) without guard ring. [) 95% (ii) 86-13%]

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter21: Resistive-capacitive Series Circuits

Section: Chapter Questions

Problem 6RQ: A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating...

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Question

8. Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of
each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the
metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement :
(1) with the guard ring. (ifi) without guard ring.
[) 95% (i) 86-13%]

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