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QUESTION 8 When connecting any electrical AC generator to an electrical grid, the frequency, phase, and...
Variable frequency electronic generation of sinusoids first requires the grid AC to be rectified into DC....
Variable frequency electronic generation of sinusoids first requires the grid AC to be rectified into DC. Next the DC is converted to high f AC by an inverter circuit. The entire process is at 95% efficiency. Below you are required to refresh your understanding of AC to DC rectifiers. Diode rectifiers are non-linear loads so grid power factor and harmonic generation are again a consideration. The total power factor is composed of two parts: the distortion power factor due to...
Voltage levels on an electrical transmission grid system are changed by means of: O generators. alternators....
Voltage levels on an electrical transmission grid system are changed by means of: O generators. alternators. transformers. rectifiers. N Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. very low AC-voltage levels. QUESTION 12 The heat used to power thermal-electric generating stations is obtained from: O fossil fuels such as coal, oil, or natural gas nuclear fusion the sun both...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at:...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. O very low AC-voltage levels. QUESTION 16 Voltage levels on an electrical transmission grid system are changed by means of: generators. O alternators. transformers. rectifiers. QUESTION 20 The generator principle is based on the fact that: O voltage is induced in a conductor whenever it is placed in a...
QUESTION 2 The voltage of an AC generator is controlled by? Increasing or decreasing the field...
QUESTION 2 The voltage of an AC generator is controlled by? Increasing or decreasing the field current Increasing or decreasing the armature current The number of slip rings QUESTION 3 The frequency of an AC generator is unknown. We know the number poles which 6 and we know the speed n which is 1200rpm. What is the frequency? 602. 50Hz 1200HZ QUESTION 4 The frequency of an AC generator is unknown. We know the number poles which 6 and we...
A wind turbine with eight poles, 60 Hz three-phase, Y-connected induction generator is delivering 500 kW...
A wind turbine with eight poles, 60 Hz three-phase, Y-connected induction generator is delivering 500 kW to the grid at 0.7 pf lagging. The terminal voltage of the generator is 690 V The electrical efficiency of the generator is 90% and the mechanical efficiency is 92%. The parameters of the machine are12 3. parameters of the machine are n.'s-0.02candx,-0.1Ω Compute the following: (Total points 17) a. Mechanical power received from wind. (Points 5) b. Developed power. (Points 5) c. Stator...
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-...
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-to- voltage fixed. What is the effect of increasing the excitation current in this case? line), 5500 VA has a synchronous reactance of 8 2 per phase at rated terminal voltage. It is operating as a generator connected to an infinite grid Determine the excitation voltage and the power angle if the...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de supply The ac generator is connected to a 460 V, fixed-voltage, fixed-frequency, three-phase supply. The synchronous reactance of the synchronous generator is 513 Ω/phase. The armature resistance of the de motor is 30 m2. The 4-pole de machine is rated 30 kW at 230 V. All unspecified losses are to be...
QUESTION 1 While connecting a DC system to the AC system using an inverter, the DC...
QUESTION 1 While connecting a DC system to the AC system using an inverter, the DC voltage is lower than the voltage at the AC system O True O False
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose...
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose as base value So.3-30MVA and Vo.Lu-26k V and calculate the per-unit (b) Assume the generator initially runs overexcited with E-1.3 pu and a real power values for the power and grid voltage output of Pe 0.32pu. Compute the reactive power and the apparent power output...
Could you please help solve this question. The following generator supplying rated load into a large...
Could you please help solve this question.
The following generator supplying rated load into a large grid at rated voltage (11kV) and 0.85 PF lagging Generator: 20 MVA, X = j15%. Voltage 11kV i) Determine the internal generator voltage. ii) The load suddenly drops to 50% rated power. If the rotating energy of the generator and its associated turbine is 2.0 p.u-seconds when running at its synchronous speed. It has 2 poles and system frequency is 50 Hz. Determine: (ii-a)...
Voltage levels on an electrical transmission grid system are changed by means of: O generators. alternators. transformers. rectifiers. N Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. very low AC-voltage levels. QUESTION 12 The heat used to power thermal-electric generating stations is obtained from: O fossil fuels such as coal, oil, or natural gas nuclear fusion the sun both...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. O very low AC-voltage levels. QUESTION 16 Voltage levels on an electrical transmission grid system are changed by means of: generators. O alternators. transformers. rectifiers. QUESTION 20 The generator principle is based on the fact that: O voltage is induced in a conductor whenever it is placed in a...
QUESTION 2 The voltage of an AC generator is controlled by? Increasing or decreasing the field current Increasing or decreasing the armature current The number of slip rings QUESTION 3 The frequency of an AC generator is unknown. We know the number poles which 6 and we know the speed n which is 1200rpm. What is the frequency? 602. 50Hz 1200HZ QUESTION 4 The frequency of an AC generator is unknown. We know the number poles which 6 and we...
A wind turbine with eight poles, 60 Hz three-phase, Y-connected induction generator is delivering 500 kW to the grid at 0.7 pf lagging. The terminal voltage of the generator is 690 V The electrical efficiency of the generator is 90% and the mechanical efficiency is 92%. The parameters of the machine are12 3. parameters of the machine are n.'s-0.02candx,-0.1Ω Compute the following: (Total points 17) a. Mechanical power received from wind. (Points 5) b. Developed power. (Points 5) c. Stator...
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-to- voltage fixed. What is the effect of increasing the excitation current in this case? line), 5500 VA has a synchronous reactance of 8 2 per phase at rated terminal voltage. It is operating as a generator connected to an infinite grid Determine the excitation voltage and the power angle if the...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de supply The ac generator is connected to a 460 V, fixed-voltage, fixed-frequency, three-phase supply. The synchronous reactance of the synchronous generator is 513 Ω/phase. The armature resistance of the de motor is 30 m2. The 4-pole de machine is rated 30 kW at 230 V. All unspecified losses are to be...
QUESTION 1 While connecting a DC system to the AC system using an inverter, the DC voltage is lower than the voltage at the AC system O True O False
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose as base value So.3-30MVA and Vo.Lu-26k V and calculate the per-unit (b) Assume the generator initially runs overexcited with E-1.3 pu and a real power values for the power and grid voltage output of Pe 0.32pu. Compute the reactive power and the apparent power output...
Could you please help solve this question.
The following generator supplying rated load into a large grid at rated voltage (11kV) and 0.85 PF lagging Generator: 20 MVA, X = j15%. Voltage 11kV i) Determine the internal generator voltage. ii) The load suddenly drops to 50% rated power. If the rotating energy of the generator and its associated turbine is 2.0 p.u-seconds when running at its synchronous speed. It has 2 poles and system frequency is 50 Hz. Determine: (ii-a)...
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