(S8.3g) P8.7. A synchronous generator is operating at 89% load at a power-factor of 0.9 leading. The terminal voltage is 4% below its rated value. Find the magnitude of the output current in per-unit.
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- Two alternators rated 400 MW and 600 MW are operating in parallel. The droop characteristics of their governors are 3% and 4% respectively from no load to full load. Assuming that the alternators are operating at 50 Hz at no load, how would a load of 1000 MW be shared between them? What will be the system frequency at this load? [Ans. G1 = 468.132 MW, G2 = 531.669 MW, f= 48.296 Hz]The amplitude of the sinusoidal symmetrical AC component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going through the stages of and periods. Fill in the BlanksA synchronous generator with a synchronous reactance of 1.15 p.u. is connected to an infinite bus whose voltage is one p.u. through an equivalent reactance of 0.15 p.u. The maximum permissible active power output is 1.2 p.u.A. Compute the excitation voltage E.B. The power output is gradually reduced to 0.7 p.u. with fixed field excitation. Find the new current and power angle δ.
- Find Avrage and RMS VALUE?Discussion:- 1. What do you understand by "armature- reaction"? Discuss the effect of armature reaction in an alternator when it is loaded with resistive, inductive and capacitive loads. 2. Give the value of voltage regulation for different power factors at full load current and interpret their values.A 1200 kW,60 Hz synchronous alternator A identical governor droop of 0.0005 Hz/kW.Machine A takes two third of 1000kW bus load at 60 Hz.lf an additional 800 kW load is connected to the bus determine (a) bus frequency (b) load on each machine. is in parallel with a 400 kW,60 Hz alternator B.Both machines have (a) 58.6 Hz (b) 566.67 kW, 433.33 kW. (a) 59.6 Hz (b) 866.67 kW, 133.33 kW (a) 59.8 Hz (b) 666.67 kW, 333.33 kW (a) 58.9 Hz (b) 766.67 kW, 233.33 kW
- Discuss about Generator modeling in transient stability and derive the formula for the real and reactive power supplied by it.What are the conditions in paralleling of these DC Generators:a. Shuntb. Seriesc. CompoundAs seen in the figure, three generators of 800 kW, 900 kW and 1000 kW are connected in parallel. It generators feed 380 kW load. Frequency-active power graphs of generators are shown as given. According to this; a. Calculate the operating frequency for the situation given in the question.b. Calculate the power transferred by the generators to the load.c. A three-phase asynchronous load of 800 kW and 600 kVA with a reverse power coefficient of 0.78 is installed in the system. engine is connected. The new operating frequency of the system and the active power of the alternators. calculate.d. Do you think the generators in this system are suitable for parallel connection as in the figure?
- 8. A 3-phase, star connected alternator is rated 500 KVA, 1.1 KV. Its effective resistance/phase and synchronous reactance/phase are 1.0 Ohms and 1.5 Ohms respectively. Calculate the percentage voltage regulation at full load 0.8 power factor leading condition. Draw the phasor diagram corresponding to leading power factor condition and drive the expression for the induced emf.Two identical 20 MW three-phase alternators operate in parallel. The governor of first machine is such that the frequency drops uniformly from 50 Hz on no-load to 48 Hz on full load. The corresponding uniform speed drop of the second machine is from 50 Hz to 47.5 Hz. How will the two machines share a load of 30 MW?What is voltage stability? How is reactive power linked with the voltage stability in the power system? Write down the effect of ‘Load Tap Changer (LTC)’ on voltage stability and analyze very briefly using P-U (nose) curve.