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Q#1 Transmission and Distribution GATE EE 1999 MCQ +2 marks -0.66 marks

In a transmission line each conductor is at 20 kV and is supported by a string of 3 suspension insulators. The air capacitance between each cap-pin junction and tower is one-fifth of the capacitance C of each insulator unit. A guard ring, effective only over the line-end insulator unit is fitted so that the voltages on the two units nearest the line-end are equal                 

(a) Calculate the voltage on the line-end unit

(b) Calculate the value of capacitance  required

(a) 7.05kV
(b) 0.367C

(a) 8.05kV
(b) 0.367C

(a) 5.88kV
(b) 0.567C

(a) 4.56kV
(b) 0.367C

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