A 25 MVA, 24.25 kV, 50 Hz, 4 poles, Y- connected synchronous generator has a synchronous reactance of 9 2 and armature resistance of 0.5 2. At 60 Hz, the total mechanical losses are 2 MW. The no-load saturation curve giving the relationship between output phase voltage, E. and excitation current I, is shown as in Fig. Q2. If the excitation is adjusted so that the terminal line voltage remains fixed at 24.25 kV, calculate the following: Open eire sit eharactecietie 20 18 16 14 12 10 Pield ouent (A) Fig. Q2 Exciting field current required at no-load. (i) Required exciting field current for 20 MW of connected load with 0.8 power factor lagging. (i) Efficiency of the generator at condition ii). (AN) on S-d

A 25 MVA, 24.25 kV, 50 Hz, 4 poles, Y- connected synchronous generator has a synchronous reactance of 9 2 and armature resistance of 0.5 2. At 60 Hz, the total mechanical losses are 2 MW. The no-load saturation curve giving the relationship between output phase voltage, E. and excitation current I, is shown as in Fig. Q2. If the excitation is adjusted so that the terminal line voltage remains fixed at 24.25 kV, calculate the following: Open eire sit eharactecietie 20 18 16 14 12 10 Pield ouent (A) Fig. Q2 Exciting field current required at no-load. (i) Required exciting field current for 20 MW of connected load with 0.8 power factor lagging. (i) Efficiency of the generator at condition ii). (AN) on S-d

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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

A 25 MVA, 24.25 KV, 50 Hz, 4 poles, Y- connected synchronous generator has a synchronous
reactance of 9 2 and amature resistance of 0.5 2. At 60 Hz, the total mechanical losses are 2
MW. The no-load saturation curve giving the relationship between output phase voltage, E.
and excitation curent I,is shown as in Fig. Q2. If the excitation is adjusted so that the terminal
line voltage remains fixed at 24.25 kV, calculate the following:
Open cie nit charactecistic
20
18
16
14
12
10
3
Field eurrent (A)
Fig. Q2
Exciting field current required at no-load.
(i) Required exciting field current for 20 MW of connected load with 0.8 power
factor lagging.
(1)
Efficiency of the generator at condition ii).
(iv) Input torque of generator

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Step 2 (i) Exciting field current required at no-load:

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Step 3 (ii) Required exciting field current for 20 MW load with 0.8 power factor lagging:

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Step 4 (iii) Efficiency of the generator at condition in (ii):

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