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Calculate a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per phase c. The total reactance of the circuit, per

Calculate a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per phase c. The total reactance of the circuit, per

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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11 State the of excitation constant, the and In 8, if the current is kept SYNCHRONOUS GENERATORS 383 poling of large Calculate les covered here put, efficiency, to all machines. sformers. a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per frequency if the speed is a. 1000 r/min b. 5 r/min phase c. The total reactance of the circuit, per phase d. The line current Intermediate level What is meant by the synchronous reac- tance of a 3-phase generator? Draw the e. The line-to-neutral voltage across the load asing a stationary us generators? nected in wye? plain the meaning of all the parameters. State the advantages of brushless excitation systems over conventional systems. Using a schematic circuit diagram, show how the f. The line voltage across the load g. The power of the turbine driving the alternator h. The phase angle between E, and the voltage across the load 17 A3-phase generator rated 3000 KVA, 20 kV, 900 r/min, 60 Hz delivers power to a 2400 KVA, 16 kV load having a lagging power factor of 0.8. If the synchronous reactance is 100 N, calculate the value of E per phase. The generator in Fig. 2 has a synchronous reactance of 0.4 2, per phase. It is con- nected to an infinite bus having a line volt- age of 14 kV, and the excitation voltage is adjusted to 1.14 pu. petween steam- ent-pole genera- rotor in Fig. 7 is excited. 12 Referring to Fig. 13, calculate the exciting current needed to generate a no-load line put, which of voltage of a. 24.2 kV b. 12.1 kV site, it is found n at close to oupled genera- 18 13 A3-phase generator possesses a synchro- nous reactance of 6 N and the excitation ency of 60 Hz, voltage E, is 3 kV per phase (ref. Fig. 19). Calculate the line-to-neutral voltage E for a resistive load of 8N and draw the phasor diagram. a the rotor ator produces a 2 kV. If a load Calculate a. The torque angle & when the generator a. In Problem 13, draw the curve of E versus I for the following resistive loads: infinity, 24, 12, 6, 3, 0 ohms. b. Calculate the active power P per phase in each case. ctor of 0.8 is delivers 420 MW b. The mechanical displacement angle a c. The linear pole shift (measured along the inside stator circumference) must the excita- ased in order to Itage? corresponding to this displacement angle [in] met before a gener- c. Draw the curve of E versus P. For what value of load resistance is the power output a maximum? 3-phase system? ples on the genera- ormation given. 19 A test taken on the 500 MVA alternator of Fig. 2 yields the following results: 1. Open-circuit line voltage is 15 kV for a de exciting current of 1400 A. 2. Using the same de current, with the armature short-circuited the resulting ac " Refering to Fig. 2, calculate the length of one pole-pitch measured along the internal circumference of the stator. poles on the air- Fig. 11. ing at 1200 r/min ge of 9 kV, 60 Hz. oltage be affected if onnected to its the following characteristics: line current is 21 000 A. E, = 2440 V Calculate X, = 144 0 R = 170 a. The base impedance of the generator, per phase b. The value of the synchronous reactance impedance Z 175 N (resistive) Dee bum wod bo ri ovil
Transcribed Image Text:11 State the of excitation constant, the and In 8, if the current is kept SYNCHRONOUS GENERATORS 383 poling of large Calculate les covered here put, efficiency, to all machines. sformers. a. The synchronous impedance Z, per phase b. The total resistance of the circuit, per frequency if the speed is a. 1000 r/min b. 5 r/min phase c. The total reactance of the circuit, per phase d. The line current Intermediate level What is meant by the synchronous reac- tance of a 3-phase generator? Draw the e. The line-to-neutral voltage across the load asing a stationary us generators? nected in wye? plain the meaning of all the parameters. State the advantages of brushless excitation systems over conventional systems. Using a schematic circuit diagram, show how the f. The line voltage across the load g. The power of the turbine driving the alternator h. The phase angle between E, and the voltage across the load 17 A3-phase generator rated 3000 KVA, 20 kV, 900 r/min, 60 Hz delivers power to a 2400 KVA, 16 kV load having a lagging power factor of 0.8. If the synchronous reactance is 100 N, calculate the value of E per phase. The generator in Fig. 2 has a synchronous reactance of 0.4 2, per phase. It is con- nected to an infinite bus having a line volt- age of 14 kV, and the excitation voltage is adjusted to 1.14 pu. petween steam- ent-pole genera- rotor in Fig. 7 is excited. 12 Referring to Fig. 13, calculate the exciting current needed to generate a no-load line put, which of voltage of a. 24.2 kV b. 12.1 kV site, it is found n at close to oupled genera- 18 13 A3-phase generator possesses a synchro- nous reactance of 6 N and the excitation ency of 60 Hz, voltage E, is 3 kV per phase (ref. Fig. 19). Calculate the line-to-neutral voltage E for a resistive load of 8N and draw the phasor diagram. a the rotor ator produces a 2 kV. If a load Calculate a. The torque angle & when the generator a. In Problem 13, draw the curve of E versus I for the following resistive loads: infinity, 24, 12, 6, 3, 0 ohms. b. Calculate the active power P per phase in each case. ctor of 0.8 is delivers 420 MW b. The mechanical displacement angle a c. The linear pole shift (measured along the inside stator circumference) must the excita- ased in order to Itage? corresponding to this displacement angle [in] met before a gener- c. Draw the curve of E versus P. For what value of load resistance is the power output a maximum? 3-phase system? ples on the genera- ormation given. 19 A test taken on the 500 MVA alternator of Fig. 2 yields the following results: 1. Open-circuit line voltage is 15 kV for a de exciting current of 1400 A. 2. Using the same de current, with the armature short-circuited the resulting ac " Refering to Fig. 2, calculate the length of one pole-pitch measured along the internal circumference of the stator. poles on the air- Fig. 11. ing at 1200 r/min ge of 9 kV, 60 Hz. oltage be affected if onnected to its the following characteristics: line current is 21 000 A. E, = 2440 V Calculate X, = 144 0 R = 170 a. The base impedance of the generator, per phase b. The value of the synchronous reactance impedance Z 175 N (resistive) Dee bum wod bo ri ovil
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