Problem 3: A 30KVA, 3-phase, 230V,Y connected synchronous generator has a synchromous reactance of 0.8Q. The armature resistance is negligible. Calculate the percentage voltage regulation and the power angle for each of the following cases: 50% full-load at unity power factor. a) b) 25% full-load at 0.8 lagging power factor.
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- two synchronous generators are connected in parallel, feeding a load together. the frequency of the first generator in the no-load State is 52 Hz and the slope of the characteristic is 1 MW/Hz. the total power of the load fed by these two generators is 2.5 MW and the power coefficient is 0.6 inductive. by drawing the characteristic curve of the system;a) what is the frequency of the system when the load in question is fed, and how do the two generators share the load between themselvesb) if a load of 0.5 MW is added to the system, find the operating frequency of the new system and the powers given by each generatorc) if a second load of 0.5 MW is connected to the system, the idle operating frequency of the second generator is increased by 0.5 Hz, what happens to the operating frequency of the system and the power values given by the generatorssynchronous generator threewThe phases are rated at 1000 kVA and operate at a voltage of 6.6 kV. The product resistance per phase is 0.38 ohms and the leakage reactance is 0.5 ohms per phase. The generator works to provide full load at a power factor of 0.85 delayed and at normal voltages. Find the value of the no-load voltage.A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216 slots, each containing 5 conductors arranged in a full-pitched winding for 3-phase star connection. All the conductors of each phase are in series and the flux per pole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emf induced in each phase winding and the terminal voltage.
- A 1MVA, 11 KV, three phase wye-connected synchronous generator has a synchronous reactance of 5 ohms and a negligible reactance per phase. At a certain field current the generator delivers rated load at 0.9 lagging power factor at 11 KV. For the same excitation, what is the terminal voltage at 0.9 leading power factor full-load?Two 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 42. A synchronous generator is connected to an inductive load, please draw phasor diagram to show the relationship between the internal generated voltage of the generator and the terminal voltage across the load. If the same generator is connected to a capacitive load, please draw phasor diagram to show the relationship between the internal generated voltage of the generator and the terminal voltage cross the load again. Explain the difference of the terminal voltage responses at these two types of loads.
- A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle & (b) Reictive power drawn by the load Carry out calculations in pu form and convert the result to actual values.A long shunt compound generator delivers a current of 10A at 200V and has a series field resistance and shunt field resistance of 1 ohm and 200 ohms respectively. Then line current is a. 2A b. 1A c. 9A d. 10AThree identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 24 MVA, 50 Hz, 0.85 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 5.0 MW/Hz, respectively The no-load frequency of each generator is set to 52.4 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: O a. fsys = 49.2 Hz O b. None O c. fsys = 48.9 Hz O d. fsys = 48.32 Hz Clear my choice
- Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 21 MVA, 50 Hz, 0.85 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 5.2 MW/Hz , 4.5 MW/Hz, and 4.9 MW/Hz, respectively The no-load frequency of each generator is set to 52.4 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: O a. fsys = 48.97 Hz O b. fsys = 48.25 Hz c. fsys = 49.22 Hz O d. NoneThree identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 20 MVA, 50 Hz, 0.85 PF lagging, 4-poles, Y-connected, with a synchronous reactance of 2 N and an armature resistance of 0.05 Q. Each of generators Gj and G2 has a characteristic power-frequency slope of 4.7 MW/Hz, while generator G3 has a slope of 5.0 MW/Hz. If all three generators are supplying a total load of 51.2 MW, and the no-load frequency of each generator is set to 52.4 Hz, what will the system frequency be? How much power is supplied by generator G3? Select one: O a. fsys = 48.84 Hz, PG3 =17.8 MW O b. fsys = 49.05 Hz, PG3 = 16.75 MW c. fsys = 48.95 Hz, PG3 = 17.25 MW d. NoneThree identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 20 MVA, 50 Hz, 0.85 PF lagging, 4-poles, Y-connected, with a synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 and G2 has a characteristic power-frequency slope of 4.7 MW/Hz, while generator G3 has a slope of 5.0 MW/Hz. If all three generators are supplying a total load of 51.2 MW, and the no-load frequency of each generator is set to 52.4 Hz, what will the system frequency be? How much power is supplied by generator G3? Select one: O a. fsys = 48.84 Hz, PG3 = 17.8 MW O b. None O c. fsys = 49.05 Hz, PG3 = 16.75 MW O d. fsys = 48.95 Hz, PG3 = 17.25 MW Clear my choice