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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 else can I help you with?
Is three phase transmission line is example of bundle conductor?
'Bundled' conductors describe a line in which two or more conductors are supported from the same insulator chain. In the UK, 275-kV transmission lines typically use two conductors per line, and 400-kV transmission lines typically use four conductors per line. The purpose of bundling conductors is to spread the electric stress on the conductors (e.g. for four conductors, the same amount of electric flux will be 'shared' between the four conductors, rather than concentrated on the surface of one conductor).
What are bundled conductors?
High-voltage transmission line conductors are 'bundled' -that is, each 'line' comprises two or more conductors, rather than a single conductor, suspended from each insulator chain. The reason for bundling is to reduce the intensity of the electric field on the surface of the conductors (the same field is shared between the surfaces of several, rather than just one, conductors), which would otherwise result in a breakdown of the insulating property of the air immediately surrounding a single conductor. In the UK, 400-kV transmission lines use a bundle of four conductors per line, and 275-kV transmission lines use a bundle of two.
What is definition of transmission lines?
Conductors that transmit an electric signal.
What is the difference between bundled conductors and composite conductors?
Bundled conductors are used to reduce the effect of corona. As in place of a single conductor. two conductors are used in parallel the voltage gradient build up is less and thus the ionisation of the surrounding air is decreased. Therefore the effect of corona is reduced.
Why dampers are used at the end of tower in transmission lines?
To 'damp' vibrations in the conductors.
Why do power transmission lines not have neutral conductor?
No neutral is necessary, because the transmission line's line currents are roughly balanced and, so, the phasor sum of those currents will be relatively insignificant, rendering the need for a neutral conductor to be an unnecessary expense. In practise, for most transmission towers, each of the three 'lines' comprises not just a single conductor but, rather, a number of conductors which are bundled together in order to reduce electric stress surrounding the line. The number of conductors per bundle increases with transmission voltages. In the UK, for example, 400-kV transmission lines normally comprise bundles of four conductors, whereas 275-kV transmission lines normally comprise bundles of two, and 132-kV lines just one. Running along the top of transmission towers is an earthed conductor, called a 'guard conductor', whose function is to protect the lines from lightning strikes during electrical storms. Many transmission towers also have two, separate, three-phase circuits -one circuit on each side of the tower. But, definitely, no neutral!
Why is a sag provided in the transmission line?
Sag is provided in transmission lines in order to lessen the tension of the transmission lines. Sag literally means to be bend in shape. In overhead transmission lines , the difference in level between points of supports (towers or utility poles) and the lowest point on the conductor is called a sag. Explanation: While erecting an overhead line, it is very important that the conductors are under safe tension. If the conductors are too much stressed between the supports ( towers, utility poles), then the stress on the conductors may reach to an unsafe level and the conductor may break due to excessive pressure ( i,e tension). in order to permit safe tension in the conductors, the conductors ( i.e the transmission lines) are not fully stretched but are allowed to have a dip or a sag.
What is transposition of a transmission line?
The balancing effect on account of irregular spacing of conductors can be avoided by changing the position of the conductors at regular distances. this is called transposition of conductors. In case of 3- phase transmission lines, the inductance and capacitance of each phase will be different if the three conductors are spaced differently (each phase to the other two phases, and each phase to ground). the apparent resistance of the conductors is also affected on account of transfer of power between the phases which occur due to mutual coupling. so all the three parameters of the transmission lines are affected by irregular spacing of the conductors.
What has the author Sidney Frankel written?
Sidney Frankel has written: 'Multiconductor transmission line analysis' -- subject(s): Electric conductors, Multiconductor transmission lines
Hollow conductors in transmission line used to?
To reduce skin effect.CommentHollow conductors are not used on electricity transmission lines. Transmission-line conductors are normally manufactured of stranded aluminium conductors, wound around a steel-wire core. The steel core improves the conductor's tensile strength.Hollow conductors are, though, used as 'wave guides' in radio-frequency circuits. However, their purpose is not to reduce skin effect (in which most of the current flows close to the surface of the conductor), but to save copper -if most of the current flows close to the surface, then there's little point in using solid copper!AnswerHollow conductors are used on very high voltage underground cables, which are cooled by passing oil or gas through the conductors.
What are the balls on high voltage transmission lines?
The balls on overhead conductors are, belive it or not to make them visable to birds, helecoptors and planes etc, so they wont fly in to them. They have no electrical purpose what so ever, Sorry to sat its that simple!! Colin
What is the purpose of ground wires in overhead transmission lines?
connection of the ground of all the transmission lines and used as a communication cable between protection devices
