A single-line diagram of a three-phase balanced system is given below. A bolted threephase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate the rated interrupting current rating of circuit breaker A, D and E, both in per unit and Ampere value

A single-line diagram of a three-phase balanced system is given below. A bolted threephase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate the rated interrupting current rating of circuit breaker A, D and E, both in per unit and Ampere value

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.49P: Consider the single-Line diagram of a power system shown in Figure 3.42 with equipment ratings...

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Concept explainers

Single Phase AC Circuit

Alternating Current (AC) is a type of electric power in which the electric current changes, both in magnitude and direction, at regular intervals. This AC Circuits can deliver power in either a Single Phase system or a Three Phase system.

Question

Answer follow image.

A single-line diagram of a three-phase balanced system is given below. A bolted three-
phase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate
the rated interrupting current rating of circuit breaker A, D and E, both in per unit and
Ampere value.
ic 10% D
8000KVA
12%
(MI)
9KV
22/11 KV
22,000 KVA
A
20%.
Gen
11/22 KX
6000KVA
Mz
It
22/7.33K
11 KV
6KY
15%
22,000 KVA
22,000 KVA
15%
22, 000 KVA
14%
All tue given impedances are su btranslent valuer7

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