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Question 3: For the power system as shown, the line impedance is 4+j 3 ohms (primary) and zone 1 is set to cover 85% of the transmission line. a) At what loading (P+jQ) will the zone 1 relay see it as a fault? Assume that the line loading is at 0.8 pf lagging. b) What is the apparent impedance seen by the relay (secondary ohms)? Rated voltage = 34.64 kV (line-to-line) Rated MVA = 24 MVA A B P+jQ CT ratio = 500:5A VT ratio = 20,000:69.3V 21

Question 3: For the power system as shown, the line impedance is 4+j 3 ohms (primary) and zone 1 is set to cover 85% of the transmission line. a) At what loading (P+jQ) will the zone 1 relay see it as a fault? Assume that the line loading is at 0.8 pf lagging. b) What is the apparent impedance seen by the relay (secondary ohms)? Rated voltage = 34.64 kV (line-to-line) Rated MVA = 24 MVA A B P+jQ CT ratio = 500:5A VT ratio = 20,000:69.3V 21

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Will you please help me to solve part a of this question. thanks

Question 3: For the power system as shown, the line impedance is 4+j 3 ohms (primary) and zone 1 is set to cover 85% of the transmission line. a) At what loading (P+jQ) will the zone 1 relay see it as a fault? Assume that the line loading is at 0.8 pf lagging. b) What is the apparent impedance seen by the relay (secondary ohms)? Rated voltage = 34.64 kV (line-to-line) Rated MVA = 24 MVA A B P+jQ CT ratio = 500:5A VT ratio = 20,000:69.3V 21
Transcribed Image Text:Question 3: For the power system as shown, the line impedance is 4+j 3 ohms (primary) and zone 1 is set to cover 85% of the transmission line. a) At what loading (P+jQ) will the zone 1 relay see it as a fault? Assume that the line loading is at 0.8 pf lagging. b) What is the apparent impedance seen by the relay (secondary ohms)? Rated voltage = 34.64 kV (line-to-line) Rated MVA = 24 MVA A B P+jQ CT ratio = 500:5A VT ratio = 20,000:69.3V 21
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