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INTRODUCTION ON TRANSMISSION LINE

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TYPES OF TRANSMISSION LINE

OVERHEAD TRANSMISSION LINE.
UNDER GROUND TRANSMISSION LINE.

MAIN COMPONENTS OF TRANSMISSION LINE

CONDUCTORS.
SUPPORTS.(POLES OR TOWERS)
INSULATORS.
CROSS ARMS.
VARIOUS ITEMS.(PHASE & DANGER PLATES)

PROPERTIES OF CONDUCTOR MATERIALS

HIGH ELECTRICAL CONDUCTIVITY.
HIGH TENSILE STRENGTH.
LOW COST.
LOW SPECIFIC GRAVITY.

PROPERTIES OF CONDUCTOR MATERIALS

ALUMINIUM.
CONDUCTIVITY IS 60% OF COPPER..
SPECIFIC GRAVITY OF AL . (2.71gm/cc) IS LESS THAN CU .(8.9gm/cc)
VERY LIGHT IN NATURE & LOW COST.
LOW TENSILE STHENGT SO SAG IS HIGH.
THE COMBINED PROPERTIES OF AL . OFFERS AN ADVANTAGE 2 USE 4 TRANSMISSION OVER CU .

STEEL CORED ALUMINIUM
AL . IS REINFORCED WITH A CORE OF GALVANISED STEEL WIRE 2 INCREASE THE TENSILE STRENGTH .
ABBREVIATED AS A.C.S.R (AL . CONDUCTOR STEEL REINFORCED)
SAG PRODUCED IS THUS VERY LESS.
AS SAG IS LESS TOWERS OF SMALLER HEIGHT CAN BE USED.

GALVANISED STEEL.
HIGH TENSILE STRENGTH.
USED FOR LONG SPAN.
POOR CONDUCTIVITY HENCE NOT SUITABLE FOR LARGE POWER TRANSMISSION.
USED FOR SMALL POWER TRANSMISSION.

In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to conduct radio frequency alternating current, ie currents with a sufficiently high frequency so that its wave nature is taken into account. Transmission lines are used for such purposes as the connection of radio transmitters and receivers with their antennas, distribution of cable television signals, trunk lines that route calls between telephone switching centers, computer network connections and computer data buses Of high speed.

This article covers the transmission line of two conductors, such as parallel line (ladder line), coaxial cable, band line and microstrip. Some sources also refer to waveguide, dielectric waveguide, and even fiber optics as a transmission line, however these lines require different analytical techniques and therefore are not covered by this article; see Wave-guide (electromagnetism).

Seminar Topics & Project Ideas On Computer Science Electronics Electrical Mechanical Engineering Civil MBA Medicine Nursing Science Physics Mathematics Chemistry ppt pdf doc presentation downloads and Abstract

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