Differential compound generator has better voltage regulation than that whe it is shunt connected. O True O False
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- The standard practice of synchronous generator construction now a days is to have Cylindrical field Rotating armature Either of the above Rotating field In an alternator, the armature reaction influences the magnitude of No load loss Wave form of generated voltage. Speed of the machine Flux Terminal voltage per phaseTwo 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) 4The type generator field winding is supplied from the external D.C. source. separately excited Compound Shunt Self excited
- READ THE PROBLEM AND JUST DRAW CIRCUIT DIAGRAM. NO NEED TO SOLVE ANYTHING. A short shunt compound generator delivers 150A at a terminal voltage is 230V.The shunt field current is 2.5A. The resistances of the armature, series field and diverterare 0.032 ohm, 0.015 ohm and 0.03 ohm respectively. Calculate the electrical efficiencyof the generator at this load. Modify the circuit diagram on the picture based on the problem. Answer: 95.7%synchronous 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.Duestion. Explain sompound DC :- describe its generator types of also and terminal characteristics compound DC. generator
- The internal characteristics of DC shunt generator can be obtained from *In differential compound DC Generator the shunt field current and the series field current are in opposite direction Select one: True False For lap and wave wound generators the generated power is same. Select one: True Falseand t A common base of 100 MVA and 25 KV is selected. What is the current base (Ig) Select one: O a. 4 KA O b. None of these O c. 6.25 kA O d. 2.309 KA A 100-MVA, 60-kV, three-phase synchronous generator has a synchronous reactance of armature resistance. The generator is operating with an excitation per phase E= 47.116 power before losing synchronism (stability limit). and the armature c Thus, the maximum generated power is Pmax =
- When a generator has terminal a open and the other two terminals are connected to each other with a short circuit from this connection to ground, typical values for the symmetrical components of current in phase a are " - 600/-90' . - 250/90" , and 0 = 350/90: A. Find the current into the ground and the current in each phase of the generator.9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364V10- 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 series field current is a. 10A b. 9A c. 1A d. 2A