Consider a 220-kV transmission system shown in Figure Q2. The per phase the impedances of the lines LO1 and L02 are 2 + j20 and 2.5 + j25 0, respectively. The outputs of the CT and VT are standardized at 5 A and 110 V, respectively. If the maximum load supplied by the line L01 is 100 MVA with a lagging power factor of 0.9, design a three- zone distance-relaying system for the RO distance relay by determining the following: (a) maximum load current (b) CT ratio; (c) VT ratio; (d) impedance measured by relay; (e) load impedance referred to the output side of the sensors; () Stage 1 setting of relay RO; (g) Stage 2 setting of relay R0;

Consider a 220-kV transmission system shown in Figure Q2. The per phase the impedances of the lines LO1 and L02 are 2 + j20 and 2.5 + j25 0, respectively. The outputs of the CT and VT are standardized at 5 A and 110 V, respectively. If the maximum load supplied by the line L01 is 100 MVA with a lagging power factor of 0.9, design a three- zone distance-relaying system for the RO distance relay by determining the following: (a) maximum load current (b) CT ratio; (c) VT ratio; (d) impedance measured by relay; (e) load impedance referred to the output side of the sensors; () Stage 1 setting of relay RO; (g) Stage 2 setting of relay R0;

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

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.18P

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