1) Sketch a graph that describes the relation between the field current and the terminal voltage...
24. Synchronous motor delivers reactive power when: a. The terminal voltage leads the induced voltage in armature windings b. The terminal voltage lags the induced voltage in armature windings c. Synchronous motor is an inductive load; it absorbs reactive power. Capacitors deliver reactive power d. The terminal voltage is less than the induced voltage in armature windings e. None of the above. 25. In a synchronous machine, if magnetic field of the rotor lags the stator field by a mechanical...
A 2300 V (terminal voltage), 1000 kVA, 0.8 PF lagging, 60-Hz, two pole, Y connected synchronous generator has a synchronous reactance of 1.1 2 and an armature resistance of 0.15 Ω. At 60Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW The field circuit has a dc voltage of 200 V, and the maximum If Ir is 10 A. The resistance of the field circuit is adjustable over the range from 20 to...
need full solution plz A figure in the following shows a connection between a synchronous generator and a synchronous motor. The rated specifications of each of the two machines are also shown. Pout(G)Pin(M) Synchronous Pin(G) Synchronous Pout(M) C. Generator Motor Sync. Generator Specifications Sync. Motor Specifications Terminal Voltage 480 V | Terminal Voltage Power Factor 0.8 lagging Power Factor 0.8 leading Apparent Power 200-kVA Active Power 40-kW Frequency 50 Hz Frequency Y (wye) Connection 0.30Synch Reactance 0.0 Ω I Armature...
A 3 KVA load is operating at a terminal voltage ? = 380 < 0° ?. It is supplied from a synchronous generator whose synchronous impedance ?? = .5+? 1.5 Ω . Calculate the excitation voltage ?? of the generator, and the armature current ??, if the load is operating at .71 pf lagging. Also draw the phasor diagram corresponding to the question
Questions: 1. What is the difference between a synchronous motor and a synchronous generator? 2. What techniques are available to start a synchronous motor? 3. What is a synchronous capacitor? Why would one be used? 4. What are slip and slip speed in an induction motor? 5. What information is learned in a locked-rotor test? What information is learned in a no-load test?
Power generations 1. The output voltage of a synchronous generator is a function of the a. speed of rotation and polarity of the field current. b. speed of rotation and strength of the field electromagnet. c. speed of rotation and input torque. d. speed of rotation only 2. The equivalent circuit for one phase of a three-phase synchronous generatoir operating at constant speed and fixed field current is a. identical to that of a dc generator b. very similar to...
true or false with explanation a- A separately excited DC generator terminal current increases as a resistive load is applied b- In a separately excited DC generator, a voltage will exist at the terminals for a zero speed c- Doubling the load on the generator will increase the generator voltage by a factor of two. d- The commutator is used for adding a resistor to the rotor. e- A rotating magnetic field is produced around the air gap.
Q1. In a synchronous generator, how to adjust (increase or reduce) the field current so that the generator has lagging power factor? Give your explanation. Q2. In a synchronous motor, how to adjust (increase or reduce) the field current so that the motor has leading power factor? Give your explanation. Q3. In a synchronous motor, is the power input to the field winding is larger than the power input to the armature winding? Give your explanation.
A 12 kV, 300 MVA synchronous generator is tested at a field current of 200 A. The open-circuit voltage was found to be 10 kV and the short-circuit current was 7.5 kA. The stator resistance was measured at 0.1 ohms per phase. i) Find the value of the synchronous reactance in per-unit. [ 2 marks ] ii) The synchronous generator is delivering half rated output at a terminal voltage of 5% below rated voltage and a power factor of 0.7...
2. When the terminal voltage of this motor is 1 pu, compute the starting current RMS and the full load current RMS in pu. Assume that load torque is 1 pu. Compare the real power and reactive power consumption at motor starting and at full lood 2. When the terminal voltage of this motor is 1 pu, compute the starting current RMS and the full load current RMS in pu. Assume that load torque is 1 pu. Compare the real...