Problem: A power system is connected in a ring system has three sections. Section A has a 10MVA, 10%X supplies Load A, Section B has a 20MVA, 15%X supplies Load B and Section C has a 20MVA, 15%X supplies Load C. Every section is separated with a reactor along its busbar having 10MVA 5% at section A and B and 8MVA 4%X at section B and section C. The base values given in percent reactances are the ratings of the individual pieces of equipment. If a three phase short circuit occurs at Load A. Determine the a.) fault current and the rupturing capacity of the breaker in KVA if the busbar voltage is 11KV. b.) The circuit breaker and fuse ratings to be installed at Load A.

For the given power system connected in a ring system has three-section, Section A: 10MVA, 10%…

Answered: Problem: A power system is connected in…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN: 9780133923605

Author: Robert L. Boylestad

Publisher: PEARSON

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system …

Question

Please use S_base = 49

Problem: A power system is connected in a ring system has three sections. Section A has a 10MVA, 10%X supplies Load A, Section B has a 20MVA,
15%X supplies Load B and Section C has a 20MVA, 15%X supplies Load C. Every section is separated with a reactor along its busbar having 10MVA
5% at section A and B and 8MVA 4%X at section B and section C. The base values given in percent reactances are the ratings of the individual pieces
of equipment. If a three phase short circuit occurs at Load A. Determine the
a.) fault current and the rupturing capacity of the breaker in KVA if the busbar voltage is 11KV.
b.) The circuit breaker and fuse ratings to be installed at Load A.

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