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.
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
Chapter6: Power Flows
Section: Chapter Questions
Problem 6.47P
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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
(c) Infinite bus voltage falls to 10 kV while the
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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