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How Hollow conductor is used to reduce corona loss how does it reduce the loss?
to have large diameter without increasing its weight.
What is the line loss of 4 ACSR when the voltage is 14400 volts?
It doesn't really matter what the distribution voltage is. Line loss is dependant on the current through the conductor. #4 ACSR (aluminum conductor, steel reinforced, used in electrical transmission), has a typical resistance of 0.399 ohms per 1000 feet, and a maximum ampacity of 140. At max load, the I^2 * R loss would be about 7.82kW per 1000 feet of cable, or about 123kW per mile of 3-phase distribution. A 14,400 volt 140A system delivers about 3.48MW at unity power factor, so this represents about a 3.5% loss per mile, which is why 14.4kV is used for distribution, not transmission. Most likely, the cable would reach thermal limit well before 140A, and so would never be loaded to the max ampacity, so this is the theoretical max. At a more reasonable current, line loss would be correspondingly less.
What do you mean by eddy current loss?
Eddy currents are currents induced in conductors to oppose the change in flux that generated them. It is caused when a conductor is exposed to a changing magnetic field due to relative motion of the field source and conductor, or due to variations of the field with time. This can cause a circulating flow of electrons, or a current, within the body of the conductor. These circulating eddies of current create induced magnetic fields that oppose the change of the original magnetic field due to Lenz's law, causing repulsive or drag forces between the conductor and the magnet. The stronger the applied magnetic field, or the greater the electrical conductivity of the conductor, or the faster the field that the conductor is exposed to changes, then the greater the currents that are developed and the greater the opposing field.
What are convection currents associated with electricity?
Convection current is current that is produced when a conductor induces a current in another conductor, and that other conductor is shorted. An example would be a conductor going through a hole in a metal panel. The hole represents a one-turn transformer that is shorted. Convection current (or eddy current) represents a loss of power and it creates heat. To avoid this, you either cut a slot in the panel to the hole, breaking the circuit, or you pass symmetrically opposed or balanced conductors through the same hole. This is also why transformers are made with stacked plates, plates that are insulated from each other, and that individually do not create a circuit.
What are the advantages of OC and SC test compared to load test?
> Predetermination of regulation. > Predetermination of efficiency. > Less power loss.
How Hollow conductor is used to reduce corona loss how does it reduce the loss?
to have large diameter without increasing its weight.
What are the advantages of corona loss?
-it prevents conductor from electrical surges -it increases virtual diameter hence conductor can carry more current -corona discharge is used in photo copier and laser printers
What frequency corona loss is more?
frequency is directly propotional to corona loss... so higher the freq the corona also high..
What is corona effect in electrical?
When the distance between two conductors is more than that of the diameter and the potential difference is increased beyond the certain limit in such a way so that a glow ( seems like violet and shine ) is produced around the conductor and also noise is produced. This kind of effect called the Corona Effect in power systems. As the potential difference is increased, Corona Effect is also increased, and due to Corona Effect, Power loss in power system and disturbance in the nearer communication line is also increased.
What is conductor loss?
Conductor loss refers to the energy dissipated as heat in a material due to the flow of electric current. It is caused by the resistance of the conductor and is proportional to the square of the current flowing through it. This loss results in decreased efficiency in electrical systems and can lead to overheating if not properly managed.
What about the power loss if the area of the conductor size is doubled?
If the area of the conductor is doubled, the resistance of the conductor decreases, since resistance is inversely proportional to the cross-sectional area. This reduction in resistance leads to lower power loss, as power loss in a conductor is given by the formula ( P = I^2 R ), where ( P ) is power loss, ( I ) is the current, and ( R ) is resistance. Therefore, with a smaller resistance from the increased area, the power loss will be significantly reduced for the same current.
What is corona power loss in transmission line hvdc?
A: Transmission lines while there is ceramic insulators providing separation to the phases will have a corona if the insulators are dirty providing small current leakage ionizing the air around it therefore corona effect.
Explain the term corona in transmission line.?
At very high voltages, corona becomes an issue, such as in high power transmission. In effect, if there are any "sharp points", square corners, etc., electrons will tend to build up and this build up begins to damage the structure. this is why in very high voltage subs, you will see rings used instead of bolts or hooks (easiest to see at the top of poles).
Resistance to the flow of electrons in a conductor causes a loss of?
Energy as heat
What is purpose of using bundle conductors in ehv transmission lines?
One reason is that since the electrons travel on the surface of the transmission lines there is more surface area when conductors are bundled thereby reducing resistance to current flow thereby reducing the voltage drop across the transmission path. In extra high voltage line an electrical discharge formed by ionization of fluids surrounded by the conductor which is highly energized , so energized that it creates electrical conduction but not high enough to electrical breaking or arcing surrounding objects. this phenomenon is called corona losses.to prevent this corona loss bundle conductor is used.
What advantages would a coccus shape have over a rod shape for survival in air?
A coccus shape has a lower surface area-to-volume ratio compared to a rod shape, which reduces water loss through evaporation in dry air. Additionally, the round shape of cocci bacteria may have a lower chance of desiccation compared to rod-shaped bacteria, as they have less exposed surface area for water loss.
Why is copper made into electric wire?
Copper is used for electric wire because it is an excellent conductor of electricity due to its low resistance. This property allows electric current to flow easily through the wire with minimal loss of energy as heat. Additionally, copper is ductile and malleable, making it easy to shape into wires for different applications.
