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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 phase9.09 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; 364VREAD 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%
- Which of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.The internal characteristics of DC shunt generator can be obtained from *Which of the following is true for the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of a round pole synchronous generator? a) Due to the voltage Efd, the excitation current is equal in capacitive operation and inductive operation b) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in ohmic operation and larger in inductive operation d) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation.
- To improve power factor by static capacitor method. If the capacitance per phase is increases, then current taking from supply is Does not change Increases O Doubled O Decreases In synchronous condenser method to increase power factor, synchronous motor is act as capacitive (Capacitor) nature at O No load, rated excitation condition. Full load under excitation condition O No load, under excitation condition. No load, over excitation condition. 0S の ENG 10/CQ3: a- Compare the excitation of 3-phase induction and synchronous machines. b- Draw the phasor diagram for the alternator at each of the following operating conditions: lagging pf, leading pf, normal excitation, and maximum power. Indicate the kind of excitation and reactive power for each case.Why is it necessary to conduct polarity tests on transformers?
- Sheet no.5 Q1)two dc shunt generators operating in parallel supply a total load current of (200 A ). The terminal voltage of one generator falls uniformly from ( 240 V) to ( 225 V) when delivering (120A) The terminal voltage of the second generator falls uniformly from (230V) to (215 V ) when delivering (100 A). find the load current shared by each generator and the bus-bars voltage ? U chunt generators running in parallel supply a total load4-Why is the fall in the terminal voltage for the external chara. gereater shunt generator than in separately - excited generator?2. 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.