Máiríní a úsáidtear do Chonduiteoir Líne Transmission

Líne transmisúin is an important part of power system. The cost and life of transmission line primarily depend on the material used for making conductor for transmission line. The most important and much suitable material for conductor of transmission line is copper as it having high conductivity and high tensile strength. More ever it is having good ductility. The only limitation is its cost. The most extensively used material in transmission line is Aluminum.
Aluminum is having sufficient conductivity. More ever it is light in weight. Which results in low conductor weight and less sag. The only limitation is its low tensile strength. To overcome this limitation steel core is used for increasing the tensile strength of aluminum conductor such as in ACSR (Aluminum conductor steel reinforced) conductor.

ACSR conductor is very much popular for high voltage overhead transmission lines. The choice of suitable material for Líne transmisúin depends upon–

1. Required electrical properties

2. Required mechanical strength

3. Local conditions

4. Cost of material

An tairiscintí riachtanacha i mbhríomháil atá á n-úsáid mar chonduiteoir i líne transmisúin

1. High conductivity

2. High tensile strength

3. Light weight

4. High resistance to corrosion in whether conditions

5. High thermal stability

6. Low coefficient of thermal expansion

7. Low cost

Bríomháil atá á n-úsáid do líntí transmisúin

Bríomháil atá á n-úsáid do líntí transmisúin are listed below-

1. Copper

2. Aluminum

3. Cadmium – Copper alloys

4. Phosphor bronze

5. Galvanized steel

6. Steel core copper

7. Steel core aluminum

Copper (Cu)

The extensively used, high conductivity material as conductor for electrical machines or equipment, is copper. Malleability, weldability and solder ability are most important properties of copper. Copper in pure form is having good conductivity. But the conductivity of standard grade copper is reduced due presence of impurities.

Properties of Copper

1. Resistivity: 1.68 µΩ -cm.

2. Temperature coefficient of resistance at 20oC: 0.00386 /oC.

3. Melting point: 1085oC.

4. Specific gravity: 8.96gm /cm3.

Use of Copper

Copper is the most important and much suitable material for conductor of Líne transmisúin as it having high conductivity and high tensile strength. More ever it is having good ductility. The only limitation is its cost.

Aluminum (Al)

Aluminum is an element which is a silver-white, light weight, soft, non-magnetic and ductile metal. Aluminum is the third most abundant element (after oxygen and silicon) and most abundant metal found in earth’s crust. The main ore of aluminum is bauxite. Aluminum is having low density, high ductility, good corrosion resistance and good conductivity, which makes it suitable to use as electric conductor for transmission and distribution of electricity.

Properties of Aluminum

1. Resistivity: 2.65 µΩ -cm.

2. Temperature coefficient of resistance at 20oC: 0.00429 /oC.

3. Melting point: 660oC.

4. Specific gravity: 2.70 gm /cm3.

Use of Aluminum

The most extensively used material in transmission line is Aluminum. Aluminum is having sufficient conductivity. More ever it is light in weight. The only limitation is its low tensile strength. To overcome this limitation steel core is used for increasing the tensile strength of aluminum conductor such as in ACSR (Aluminum conductor steel reinforced) conductor. ACSR conductor is very much popular for high voltage overhead transmission lines.

Cadmium Copper Alloy

The cadmium copper alloys contain cadmium from 0.6 to 1.2%. This small addition of cadmium increase the tensile strength and corrosion resistance of copper. The conductivity of cadmium copper alloys is 90 to 96 % of pure copper.

Use of Cadmium – Copper alloy

1. For making conductors for High tensile strength transmission line.

2. For making trolley wire.

3. Heating pads.

4. Electrical blanket elements.

Gratamh