Present the single-phase equivalent circuit of a synchronous generator.

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Manojponduru answered 1 year ago

The equivalent synchronous impedance of a 25kVA, 400V three-phase Y-connected synchronous generator is 0.05 + j1.6...

The equivalent synchronous impedance of a 25kVA, 400V three-phase Y-connected synchronous generator is 0.05 + j1.6 ohm. When the rated voltage was output under no load, the rated current flowed by connecting the load. Part a) If the load power factor is 0.8, 1.0 lagging, and 0.8 lagging, calculate the pull-up voltage, load angle, and voltage fluctuation rate for each. Ignore the magnetic saturation. Part b) If the power factor is 0.8, 1.0 lagging and 0.8 leading, when the rated...

A 2000 V single-phase synchronous generator is being used as a backup generator outside a diagnostic...

A 2000 V single-phase synchronous generator is being used as a backup generator outside a diagnostic center. When the generator terminals are short-circuited and a field excitation current of 2.5 A is passed, the ammeter between the terminals read 100 A of full load current. If the terminals of the same generator are opened and the voltage across them is measured using a voltmeter, we get the value of 500 V with the same excitation current. The armature resistance is...

A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of...

A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of 0.95 Ω per phase. Its armature resistance is negligible. Its combined friction and windage losses are 1.3 kW and its core losses are 0.95 kW. The field current is constant at no-load. Its full load armature current is 55 A at 0.9PF lagging. Assume phase voltage is a reference. Determine following: a) Its terminal voltage when it is loaded with the rated current at...

The single-phase equivalent-circuit parameters for a three-phase induction motor in ohms-per-phase are R1=0.17 R2=0.24 X1=1.05 X2=0.87...

The single-phase equivalent-circuit parameters for a three-phase induction motor in ohms-per-phase are R1=0.17 R2=0.24 X1=1.05 X2=0.87 Xm=82.1 Rc=435 For a slip of 5 percent, and a terminal voltage of 460 V, line to line, calculate: A) Calculate the motor phase current and input real and reactive power. B) Calculate the mechanical output power and the power dissipated in the rotor. You might assume that the motor friction and windage losses are 270W C) Calculate the motor core loss and the...

A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0...

A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 Ω. Its full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the I2R losses) can be ignored. The field current has been adjusted such that the no-load terminal voltage is 480 V. a. What is the...

A 3-phase, 20 kVA, 208 V, 4-pole Y-connected synchronous generator has a synchronous reactance of Xs...

A 3-phase, 20 kVA, 208 V, 4-pole Y-connected synchronous generator has a synchronous reactance of Xs = 1.5 W per phase. The resistance of the stator winding is negligible. The machine is connected to a 3-phase 208 V infinite bus. Neglect losses. The field current and the mechanical input power are adjusted so that the synchronous machine delivers 10 kW at 0.8 lagging power factor. Determine the excitation voltage Ef and the power angle d. The mechanical input power is...

QUIESTION 1 A three-phase synchronous generator is connected to an infinite bus. The infinite bus voltage...

QUIESTION 1 A three-phase synchronous generator is connected to an infinite bus. The infinite bus voltage and the generated voltage are o 1.0 pu ∠0 and o 1.0pu ∠42.84 , respectively. The synchronous reactance is 0.85 pu and resistances are neglected. a) Compute power angle (δ), armature current (Is), power factor (pf), real power (P), and reactive power (Q). Draw the phasor diagram. b) If the prime mover torque is kept constant at a value corresponding to P=0.8 pu, compute...

Q4- A 480V, 50Hz, 20KVA Y-connected eight-pole synchronous generator has a per-phase synchronous impedance of 0.15+??1.1...

Q4- A 480V, 50Hz, 20KVA Y-connected eight-pole synchronous generator has a per-phase synchronous impedance of 0.15+??1.1 ?. The total mechanical and stray losses are 1.5kW. The core losses are neglected. Assume that the magnetization curve of the generator is linear. If the generator operates at full load at a unity power factor, calculate the following: a.The speed of rotation of the generator at full load. b.The voltage regulation of the generator. c.The developed torque on the shaft of the generator....

2) A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and...

2) A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging. a)Determine the internal voltage (E_i), the power angle (δ), and the line current of the machine. b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained constant,...

A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has...

A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging. a)Determine the internal voltage (E_i), the power angle (δ), and the line current of the machine. b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained constant, determine...

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