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line losses tend to increase
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∙ 6y ago
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The decrease in effective conductor cross section at high frequencies?
Is called skin effect. The higher the frequency, the worse the issue.
If we increase the current then what about the power factor?
The power factor depends on the phase angle between the voltage and current on a conductor. The amplitude of the current has no effect on it.
How can you increase the conductivity of a semi conductor?
The conductivity of a semi-conductor can be increased by raising the temperature of the semi-conductor .
What causes resistance to increase or decrease?
Voltage, if voltage is increased resistance in the circuit increasesAnswerResistance is determined by the length, cross-sectional area, and resistivity of a conductor. Resistivity is, in turn, affected by temperature -so temperature indirectly affects resistance.These are the only factors that affect resistance. Voltage and current have no direct effect whatsoever on resistance. Current can affect resistance indirectly if it causes the conductor's temperature to increase.For AC circuits, 'skin effect', due to frequency, causes the current to flow towards the surface of a conductor which acts to reduce the effective cross-sectional area of that conductor. So, frequency can also indirectly affect resistance.
What are the possible remedies against corona because of extra high voltage?
increase the size of conductor ,provide the hallow conductor,increase the critical disruptive voltage bv providing shunt capacitors. these capacitors increases the power capacity of the line.
Why does the skin effect in radio frequency caused?
Skin effect is the tendency of an alternating electric current (AC) to distribute itself within a conductor so that the current density near the surface of the conductor is greater than that at its core. That is, the electric current tends to flow at the "skin" of the conductor, at an average depth called the skin depth. The skin effect causes the effective resistance of the conductor to increase with the frequency of the current because much of the conductor does little. Skin effect is due to eddy currents set up by the AC current. At 60 Hz in copper, skin depth is about a centimetre. At high frequencies skin depth is much smaller.
Why skin effect for a conductor is not applicable for DC?
As we know that skin effect occures in ac system.skin effect dependes on frequncy.In case of dc syastem frequncy is zero.So skin effect for conductor is not applicable for dc.
What is skin effect in power system?
DEFINITION: Nonuniform density of current due to its characteristic to flow more at the surface of the conductor than that of the other section of the conductor called Skin Effect in power system.EFFECT: Due to the skin effect, whole section of the conductor can not be utilized properly. Moreover, skin effect causes increment in effective resistance of the conductor and in power loss.
How do skin effect varie with conductor material?
ya
What is skin effect?
<center> # 2 If the conductor is composed of one or more concentric circular elements, then the center portion of the conductor will be enveloped by a greater magnetic flux than those on the outside. Consequently the self induced back-emf will be greater towards the center of the conductor, thus causing the current density to be less at the center than the conductor surface. This extra concentration at the surface is known as skin effect, and results in an increase in the effective resistance of the conductor.
What is difference between skin effect and franty effect?
skin effect that happen because the current pass at the edge of the cable in the ac current because of the frequency but in the dc the current pass throw the whole conductor the franty effect the stray capacitor increase the voltage on the line due to light load and the
Why does moist skin increase the danger of a severe shock?
Because water is a better conductor then skin cells.
What is Skin effect in transmission lines?
when a conductor is carrying a steady DC current,it is uniformly distributed over the whole cross section of the conductor. however, an alternating current flowing through the conductor does not distribute uniformly . Rather it has a tendency to concentrate near the surface of the conductor. This is known as skin effect
What is meant by skin effect?
The skin effect occurs in conductors carrying alternating currents, where the tendency is for the current to flow towards the surface of the conductor. The effect increases with frequency. At radio frequencies, the skin effect is so pronounced, that there is little point in using solid conductors, so tubes are used instead.The skin effect is responsible for the so-called 'AC resistance'. This is because the skin effect acts to reduce the effective cross-sectional area of a conductor, thus increasing its resistance compared to when a DC current passes through the conductor.
What is skin effect of AC current?
The higher the frequency of the current is, the further the travelling electrons are from the center of the conductor section. That's skin effect. In very high frenquencies, such an effect even increases the resistance of the conductor because the current has less place to travel in.
What is the skin effect in electric?
In electricity, this happens with alternating current. It is the tendency for the electrons to flow near thesurface ("skin") of the conductor.
Does electric current flow only on the surface of the copper conductor?
The AC current tend to flow on the surface of the conductor. The higher the frequency, the thinner the skin. This is known as the skin effect. So DC current flow throught the entire conductor but when the signal varies (AC) there is the formation of eddy current in the conductor itself and that pushes the electrons at the surface of the conductor. You can get more information on the skin effect and skin depth on wikipedia : http://en.wikipedia.org/wiki/Skin_effect http://en.wikipedia.org/wiki/Skin_depth
