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A three-phase synchronous generator is rated 60 MVA, 11 kV. It has an armature resistance ra = 0.1 pu and synchronous reactance xS = 1.65 pu. It is feeding into an infinite bus at 11 kV delivering a current 15 kA at 0.9 power factor lagging. (a) Determine internal voltage (E) and power angle (δ). (b)Draw a vector diagram for this operation and state operating mode of the generator. (c) Infinite bus voltage falls to 10 kV while the mechanical power input to generator and its excitation remains unchanged. What is the value of the current, power factor and reactive power delivered to the infinite bus. Per-unit values are given on machine rating as the base.

A three-phase synchronous generator is rated 60 MVA, 11 kV. It has an armature resistance ra = 0.1 pu and synchronous reactance xS = 1.65 pu. It is feeding into an infinite bus at 11 kV delivering a current 15 kA at 0.9 power factor lagging. (a) Determine internal voltage (E) and power angle (δ). (b)Draw a vector diagram for this operation and state operating mode of the generator. (c) Infinite bus voltage falls to 10 kV while the mechanical power input to generator and its excitation remains unchanged. What is the value of the current, power factor and reactive power delivered to the infinite bus. Per-unit values are given on machine rating as the base.

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
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A three-phase synchronous generator is rated 60 MVA, 11 kV. It has an armature resistance ra = 0.1 pu and synchronous reactance xS = 1.65 pu. It is feeding into an infinite bus at 11 kV delivering a current 15 kA at 0.9 power factor lagging.

(a) Determine internal voltage (E) and power angle (δ).

(b)Draw a vector diagram for this operation and state operating mode of the generator.
(c) Infinite bus voltage falls to 10 kV while the mechanical power input to generator and its
excitation remains unchanged. What is the value of the current, power factor and reactive
power delivered to the infinite bus.
Per-unit values are given on machine rating as the base.

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