Explain the following related to AC-DC power transmission: (i) Need of HVDC power Transmission system (any...
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Explain the following related to AC-DC power
transmission:
(i) Need of HVDC power Transmission system (any...
(a) Two three-phase, 400kV (rms), 50Hz, AC networks are connected together via a current-source HVDC link...
(a) Two three-phase, 400kV (rms), 50Hz, AC networks are connected together via a current-source HVDC link made up of a three-phase, 12-pulse full-wave thyristor rectifier and a three-phase, 12-pulse full-wave thyristor inverter. (i) Draw the circuit diagram for this system and explain, for the rectifier stage, how the firing delay angle may be used to control the average DC voltage. (ii) Explain the main advantages of HVDC transmission compared to AC transmission. (b) An H-Bridge converter is to be used...
Q4. Most electronic systems need a dc voltage to work properly. The AC-to-DC power supply system ...
part g
Q4. Most electronic systems need a dc voltage to work properly. The AC-to-DC power supply system is including a transformer, a rectifier and a capacitor input filter. The AC input voltage is 110 Vrms at 60 Hz. (a) Draw the full wave bridge rectifier circuit with transformer which steps down voltage to safer and lower levels that are more suitable for use with diodes (b) Show how the capacitor input filter connects to the rectifier output in the...
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in...
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in power transmission, why not 10, 20, 49, 50, 60 or any other combination of AC systems? b. Mention four factors to control power flow to the load bus. Why two of these are controllable and the other two are not? c. Suppose you need to transmit 300 MW of power between locations A and B, which are 150 km apart. What level of transmission...
Question 2 In order to enhancement student understanding in Electrical Power System course, all students are...
Question 2 In order to enhancement student understanding in Electrical Power System course, all students are need to do experimental work to analyses the performances of transmission lines model. Figure 3 show a single phase representation and connections of medium transmission line with pi-model. TP11 is connected to the power supply and TP16 is connected to the load of 400 VA at power factor 0.9 lagging. Transmission line parameters are consisting of four inductances of 11.46 mH connected in series...
THESE QUESTIONS ARE FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS 14. Explain the following terms with reference...
THESE QUESTIONS ARE FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS 14. Explain the following terms with reference to corona : (i) Critical disruptive voltage (ii) Visual critical voltage (iii) Power loss due to corona 15. Describe the various methods for reducing corona effect in an overhead transmission line. 16. What is a sag in overhead lines ? Discuss the disadvantages of providing too small or too large sag on a line. 17. Deduce an approximate expression for sag in overhead lines...
Please answer question B Expert Q&A The design of any power transmission system is very sensitive to the magnitude...
Please answer question B
Expert Q&A The design of any power transmission system is very sensitive to the magnitude of the current in the lines as determined by the applied loads. Increased current result in increased power losses in the transmission lines due to the resistance of the lines. Every effort must therefore be made to keep current levels at a minimum. The process of introducing reactive elements to bring the power factor closer to unity is called power factor...
Q1. Design a three-phase balanced power system where the load is connected with the power supply...
Q1. Design a three-phase balanced power system where the load is connected with the power supply through a resistive transmission line. Your design needs to meet the following criteria: 1. Phase sequence for the power supply is ACB. You can take any phase or line as reference. 2. For the power supply, the line and phase voltages are related by a factor of V3. Please do not ignore the phase shift between the line and phase voltage or current. 3....
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct seque...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
Solve all questions and submit through blackboard by March 26, 2020 Q. 1 (i) Classify short,...
Solve all questions and submit through blackboard by March 26, 2020 Q. 1 (i) Classify short, medium and long transmission lines based on distance (km). (ii) Classify transmission lines (low, medium, high, extra high) based on voltage levels (kV). (iii) What is commonly used conductor material for overhead transmission lines. Why Aluminum and copper materials are not used for conductors of transmission lines. Q. 2: A 3-phase, 230 kV transmission line having a length of 50 km is composed of...
DC-AC inverters have many commercial and residential applications, including uninterruptible powe...
DC-AC inverters have many commercial and residential applications, including uninterruptible power supply (UPS) units, adjustable speed drives (ASD) for AC motors, and electronic frequency changer circuits. They are also used in solar electrical systems where batteries are charged from solar panels and used as the input DC voltage source. The inverter circuit converts the DC into AC voltage of desired frequency. Most of us are also familiar with HVDC transmission systems, where high voltages are first converted from AC to...
part g
Q4. Most electronic systems need a dc voltage to work properly. The AC-to-DC power supply system is including a transformer, a rectifier and a capacitor input filter. The AC input voltage is 110 Vrms at 60 Hz. (a) Draw the full wave bridge rectifier circuit with transformer which steps down voltage to safer and lower levels that are more suitable for use with diodes (b) Show how the capacitor input filter connects to the rectifier output in the...
6. Short Questions (10 x 5 = 50) a. Why 39 AC system is used in power transmission, why not 10, 20, 49, 50, 60 or any other combination of AC systems? b. Mention four factors to control power flow to the load bus. Why two of these are controllable and the other two are not? c. Suppose you need to transmit 300 MW of power between locations A and B, which are 150 km apart. What level of transmission...
Question 2 In order to enhancement student understanding in Electrical Power System course, all students are need to do experimental work to analyses the performances of transmission lines model. Figure 3 show a single phase representation and connections of medium transmission line with pi-model. TP11 is connected to the power supply and TP16 is connected to the load of 400 VA at power factor 0.9 lagging. Transmission line parameters are consisting of four inductances of 11.46 mH connected in series...
Please answer question B
Expert Q&A The design of any power transmission system is very sensitive to the magnitude of the current in the lines as determined by the applied loads. Increased current result in increased power losses in the transmission lines due to the resistance of the lines. Every effort must therefore be made to keep current levels at a minimum. The process of introducing reactive elements to bring the power factor closer to unity is called power factor...
Q1. Design a three-phase balanced power system where the load is connected with the power supply through a resistive transmission line. Your design needs to meet the following criteria: 1. Phase sequence for the power supply is ACB. You can take any phase or line as reference. 2. For the power supply, the line and phase voltages are related by a factor of V3. Please do not ignore the phase shift between the line and phase voltage or current. 3....
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
Solve all questions and submit through blackboard by March 26, 2020 Q. 1 (i) Classify short, medium and long transmission lines based on distance (km). (ii) Classify transmission lines (low, medium, high, extra high) based on voltage levels (kV). (iii) What is commonly used conductor material for overhead transmission lines. Why Aluminum and copper materials are not used for conductors of transmission lines. Q. 2: A 3-phase, 230 kV transmission line having a length of 50 km is composed of...
DC-AC inverters have many commercial and residential applications, including uninterruptible power supply (UPS) units, adjustable speed drives (ASD) for AC motors, and electronic frequency changer circuits. They are also used in solar electrical systems where batteries are charged from solar panels and used as the input DC voltage source. The inverter circuit converts the DC into AC voltage of desired frequency. Most of us are also familiar with HVDC transmission systems, where high voltages are first converted from AC to...
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