5.1 Determine the three zone settings for the relay Rab in the system shown in Figure 5.26. Thesystem nominal voltage is 138 kV, and the positive sequence impedances for the variouselements are given in the figure. The transformer impedance is given in ohms as viewedfrom the 138 kV side. Assume that the maximum load at the relay site is 120 MVA, andselect a CT ratio accordingly. The available distance relay has zone 1 and zone 2 settingsfrom 0.2 to 10 2, and zone 3 settings from 0.5 to 40 2, in increments of 0.1 2. The angleof maximum torque can be adjusted to 75° or 80°. Remember that the zone 3 of the relaymust back up the line BC, as well as the transformer.ARab(3+j40)B(2+ j50)(0+j9)сFuDFigure 5.26 System for problem 5.1

Answered: Image /qna-images/answer/7f9f3951-a9d9-4411-8d9f-4260c21692a2.jpg

Answered: 5.1 Determine the three zone settings…

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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.20MCQ

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