For the following single line diagram of a three-phase system, a three-phase fault occurs at point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault current in pu and original value at point P. Take, the given kVA and kV of the G1 as the new base. [hint: the transient and sub-transient reactances of the synchronous generators are assumed to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient reactance.] 20,000 KV A 6.9KV yo00 KVA 5KV '14% G1 Tz 平 33/69 AV 11/33KV 20000 KVA 10% G2 lond 5+j8 2 15070 KVA 12%. 25,000 KVA 6.9KV [AN the mpedarmces are given per- unit values) as orebtraen sien

For the following single line diagram of a three-phase system, a three-phase fault occurs at point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault current in pu and original value at point P. Take, the given kVA and kV of the G1 as the new base. [hint: the transient and sub-transient reactances of the synchronous generators are assumed to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient reactance.] 20,000 KV A 6.9KV yo00 KVA 5KV '14% G1 Tz 平 33/69 AV 11/33KV 20000 KVA 10% G2 lond 5+j8 2 15070 KVA 12%. 25,000 KVA 6.9KV [AN the mpedarmces are given per- unit values) as orebtraen sien

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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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

For the following single line diagram of a three-phase system, a three-phase fault occurs at
point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault
current in pu and original value at point P. Take, the given kVA and kV of the G1 as the
new base.
[hint: the transient and sub-transient reactances of the synchronous generators are assumed
to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient
reactance.]
20,000 KV A
6.9KV
I5メ
G1
yo00 KVA
14%
5KV
M
Tz
(G2
11/33KV
33/69 AV
lond 5+j8 2
20000KVA
15070 KVA
10%
12%
25,000 KVA
6.9KV
[AH the mpedances are given
per-unit values)
8%
as orebtraen sient
ww

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