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?
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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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