The main components of air transmission channels

The main components of air transmission channels:

1. The transmission tower or pole, 

is a pier building a transmission line steel towers, steel poles, concrete poles and wooden poles. Steel beam, concrete or wood is generally used in a channel with relatively low working voltage (The following 70 kV), while for high voltage lines or using extra high steel tower. Steel tower is divided according to function, such as support towers, corner towers, tower tip, turrets and towers branching transposition.

2. Isolator
Type insulators used in transmission line is the type of porcelain or glass. According to the use and construction isoltor known there are three types, namely insulator type peg, post type insulators and insulator cable channels. Insulator type post insulator pins and channels used in transmission lines with relatively low working voltage (urng of 22-33 kV), while the cable insulator can be towed into extended insulator which is tailored to the needs. Usually a disc insulators have teganngan working 20 kV, when the provisions voltage of 20 kV, the voltage is increased in accordance with the insulator. For example, when the transmission voltage of 275 kV, the number plate is 275/20 = 13.75 = & gt; 15.

3. Wire Transmitter
Type conductor wire used on the transmission line is copper with a conductivity of 100% (100% Cu), copper with a conductivity of 97,5% (97,5% Cu) or aluminum with conductivity of 61% (61% Al). Aluminum wire transmitter consists of various types of symbols as follows:

AAC (All Aluminum Conductor),  which wires are entirely made ​​of aluminum.

A AAC (All Aluminum Alloy Conductor), which  wires are made ​​entirely of aluminum mixture.

ACSR (Aluminum Conductor Steel Reinforced), namely wire aluminum conductor steel core wire.

ACAR (Aluminum Conductor, Alloy Reinforced), the wire conductor aluminum alloy reinforced with.

Of copper wire has advantages over aluminum conductor AWT, because conductivity and higher tensile strength. The drawback, for the same resistance, copper is heavier than aluminum and also more expensive. Therefore aluminum wires have replaced copper wire position.

To increase the tensile strength of aluminum wire used a mixture of aluminum. For high voltage transmission lines, where the distance between the poles / towers hundreds of meters away, it takes a higher tensile strength. The wire used for ACSR conductor.

4. Wire Land
The ground wire or ground wires also called wire protector or shield wires which are useful for protecting wires or wire phase against lightning strikes. So the ground wire installed on the phase wire. As the ground wire is generally used steel wire which is cheaper but not infrequently also use fresh ACSR.