1. A 800 kV transmission line has per phase con- ductor inductance of 1.0 mH/km and capaci- tance of 10.5 nF/km. Find the following: (a) The line surge/characteristic impedance. (b) The ideal power transfer capability of the line. (c) Transient overvoltage generated when the line conductor is struck by lightning and a peak impulse current of 30 kA is injected. 2. A circuit breaker (CB) installed on the line in Q.1 opens when a fault occurs. What will be the peak values of the 'switching overvoltages' produced when: (a) The CB opens at the instant of current zero crossing of the power frequency fault current? (b) The CB interrupts a power frequency fault current at its instant magnitude of 10 kA?

1. A 800 kV transmission line has per phase con- ductor inductance of 1.0 mH/km and capaci- tance of 10.5 nF/km. Find the following: (a) The line surge/characteristic impedance. (b) The ideal power transfer capability of the line. (c) Transient overvoltage generated when the line conductor is struck by lightning and a peak impulse current of 30 kA is injected. 2. A circuit breaker (CB) installed on the line in Q.1 opens when a fault occurs. What will be the peak values of the 'switching overvoltages' produced when: (a) The CB opens at the instant of current zero crossing of the power frequency fault current? (b) The CB interrupts a power frequency fault current at its instant magnitude of 10 kA?

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 4.10MCQ: Transmission line conductance is usually neglected in power system studies. True False

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