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Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating parts of a generating unit (including the prime mover) multiplied by the square of the radius of gyration in feet. WR2/32 2 is then the total moment of inertia of the rotating parts in slug-fl2. (a) Determine a formula for the stored kinetic energy in ft-lb of a generating unit in terms of WR2 and rotor angular velocity wm (b) Show that 2.31 x 10 'WR’(rpm)² H = per unit-seconds: Saed where Srated is the voltampere rating of the generator, and rpm is the synchronous speed in r/min. Note that 1 ft-lb = 748/550 = 1.356 joules. (c) Evaluate H for a three-phase generating unit rated 800 MVA, 3600 r/min, with WR2 = 4,000,000 lb-ft2.

Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating parts of a generating unit (including the prime mover) multiplied by the square of the radius of gyration in feet. WR2/32 2 is then the total moment of inertia of the rotating parts in slug-fl2. (a) Determine a formula for the stored kinetic energy in ft-lb of a generating unit in terms of WR2 and rotor angular velocity wm (b) Show that 2.31 x 10 'WR’(rpm)² H = per unit-seconds: Saed where Srated is the voltampere rating of the generator, and rpm is the synchronous speed in r/min. Note that 1 ft-lb = 748/550 = 1.356 joules. (c) Evaluate H for a three-phase generating unit rated 800 MVA, 3600 r/min, with WR2 = 4,000,000 lb-ft2.

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating parts of a generating unit (including the prime mover) multiplied by the square of the radius of gyration in feet. WR2/32.2 is then the total moment of inertia of the rotating parts in slug-fi2. (a) Determine a formula for the stored kinetic energy in ft-lb of a generating unit in terms of WR2 and rotor angular velocity wm. (b) Show that 2.31 x 10 WR (rpm}" H Srated per unit-seconds where Srated is the voltampere rating of the generator, and rpm is the synchronous speed in r/min. Note that 1 ft-lb = 748/550 = 1.356 joules. (c) Evaluate H for a three-phase generating unit rated 800 MVA, 3600 rimin, with WR2 = 4,000,000 lb-ft2.
Transcribed Image Text:Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating parts of a generating unit (including the prime mover) multiplied by the square of the radius of gyration in feet. WR2/32.2 is then the total moment of inertia of the rotating parts in slug-fi2. (a) Determine a formula for the stored kinetic energy in ft-lb of a generating unit in terms of WR2 and rotor angular velocity wm. (b) Show that 2.31 x 10 WR (rpm}" H Srated per unit-seconds where Srated is the voltampere rating of the generator, and rpm is the synchronous speed in r/min. Note that 1 ft-lb = 748/550 = 1.356 joules. (c) Evaluate H for a three-phase generating unit rated 800 MVA, 3600 rimin, with WR2 = 4,000,000 lb-ft2.
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