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Three identical steam-turbine generators G1, G2, and G3z are operating in parallel. Each generator is: 7.2 KV, 21.8 MVA, 50 Hz, 0.8 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 , G2 , and G3 has a characteristic power-frequency slope of 4.2 MW/Hz , 4.5 MW/Hz, and 4.4 MW/Hz, respectively The no-load frequency of each generator is set to 52.8 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur?

Three identical steam-turbine generators G1, G2, and G3z are operating in parallel. Each generator is: 7.2 KV, 21.8 MVA, 50 Hz, 0.8 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 , G2 , and G3 has a characteristic power-frequency slope of 4.2 MW/Hz , 4.5 MW/Hz, and 4.4 MW/Hz, respectively The no-load frequency of each generator is set to 52.8 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 21.8 MVA, 50 Hz, 0.8 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 0 and an armature resistance of 0.05 Q. Each of generators G1 , G2, and G3 has a characteristic power-frequency slope of 4.2 MW/Hz , 4.5 MW/Hz, and 4.4 MW/Hz, respectively The no-load frequency of each generator is set to 52.8 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur? Select one: a. None O b. fsys = 49.1 Hz c. fsys = 47.96 Hz d. fsys = 48.92 Hz O O
Transcribed Image Text:Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 21.8 MVA, 50 Hz, 0.8 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 0 and an armature resistance of 0.05 Q. Each of generators G1 , G2, and G3 has a characteristic power-frequency slope of 4.2 MW/Hz , 4.5 MW/Hz, and 4.4 MW/Hz, respectively The no-load frequency of each generator is set to 52.8 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur? Select one: a. None O b. fsys = 49.1 Hz c. fsys = 47.96 Hz d. fsys = 48.92 Hz O O
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