Does the change in the dc motor field current mainly affect the real or reactive power...
Does the change in the dc motor field current mainly affect the real or reactive power delivered by the synchronous generator? Explain.
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Does the change in the dc motor field current mainly affect the
real or reactive power...
separately excited series, shunt, compound DC motor: *Describe how does decreasing the field current IF affect...
separately excited series, shunt, compound DC motor: *Describe how does decreasing the field current IF affect the speed versus voltage characteristic and constant K1 of a separately-excited dc motor. K1=(n2-n1)/(E2-E1) *Describe how does decreasing the field current IF affect the torque versus current characteristic and constant K2 of a separately-excited dc motor? k2=(T2-T1)/(I1-I2) *Briefly describe how the speed varies as the mechanical load applied to the series motor increases, i.e. as the motor torque increases.
24. Synchronous motor delivers reactive power when: a. The terminal voltage leads the induced voltage in...
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...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
Enter the value of real power in W and reactive power in VAR A naval in-board...
Enter the value of real power in W and reactive power in
VAR
A naval in-board synchronous generator has an apparent power of 75 kVA and supplies a three-phase network of 310 V. Compute the phase currents, the real power, and the reactive power for a power factor of 0.8 Note: The given value of voltage refers to the phase voltage.
5. Explain the condition for a DC motor to develop the maximum power. If a DC...
5. Explain the condition for a DC motor to develop the maximum power. If a DC machine having an armature resistance of 0.5Ω and the full load current of 20 A. Find the induced emf of machine when it acts as: (i) Motor and (ii) Generator
Explain the shape of both the grid connected motor armature current vs. field current and armatur...
SYNCHRONOUS MACHINES
Explain the shape of both the grid connected motor armature current vs. field current and armature current vs. reactive power plots 7. Grid-connected Motor (larm, PF vs. Ifield) Grid-connected Motor (Q vs. larm) 0.250.50.75 1.25 15 1.75 2000 1000 1000 2000
Explain the shape of both the grid connected motor armature current vs. field current and armature current vs. reactive power plots 7. Grid-connected Motor (larm, PF vs. Ifield) Grid-connected Motor (Q vs. larm) 0.250.50.75 1.25 15 1.75...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our...
Q1. In a synchronous generator, how to adjust (increase or reduce) the field current so that...
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.
Book name # fundamental of electric machines A brushless DC electric motor (BLDC motor or BL...
Book name # fundamental of electric
machines
A brushless DC electric motor (BLDC motor or BL motor), also known as electronically commutated motor (ECM or EC motor) and synchronous DC motors, are synchronous motors powered by direct current (DC) electricity via an inverter or switching power supply which produces electricity in the form of alternating current (AC) to drive each phase of the motor via a closed loop controller. The controller provides pulses of current to the motor windings that...
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field...
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure) (Figure 1)operates from a 135 V DC power line. The resistance of the field windings, Rf, is 203 2. The resistance of the rotor, R is 5.60 ? , when the motor is running, the rotor develops an emf E. The motor draws a current of 4.90 A from the line. Friction losses amount to...
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...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
Enter the value of real power in W and reactive power in
VAR
A naval in-board synchronous generator has an apparent power of 75 kVA and supplies a three-phase network of 310 V. Compute the phase currents, the real power, and the reactive power for a power factor of 0.8 Note: The given value of voltage refers to the phase voltage.
SYNCHRONOUS MACHINES
Explain the shape of both the grid connected motor armature current vs. field current and armature current vs. reactive power plots 7. Grid-connected Motor (larm, PF vs. Ifield) Grid-connected Motor (Q vs. larm) 0.250.50.75 1.25 15 1.75 2000 1000 1000 2000
Explain the shape of both the grid connected motor armature current vs. field current and armature current vs. reactive power plots 7. Grid-connected Motor (larm, PF vs. Ifield) Grid-connected Motor (Q vs. larm) 0.250.50.75 1.25 15 1.75...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our...
Book name # fundamental of electric
machines
A brushless DC electric motor (BLDC motor or BL motor), also known as electronically commutated motor (ECM or EC motor) and synchronous DC motors, are synchronous motors powered by direct current (DC) electricity via an inverter or switching power supply which produces electricity in the form of alternating current (AC) to drive each phase of the motor via a closed loop controller. The controller provides pulses of current to the motor windings that...
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure) (Figure 1)operates from a 135 V DC power line. The resistance of the field windings, Rf, is 203 2. The resistance of the rotor, R is 5.60 ? , when the motor is running, the rotor develops an emf E. The motor draws a current of 4.90 A from the line. Friction losses amount to...
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