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UET20419 Certificate II in Transmission Structure and Line Assembly

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The qualification gives the basic and practical skills and knowledge in the application and working strategy in the electricity supply industry as a worker in the transmission line. The qualification takes and covers all the techniques and theoretical based theories in the structures and transmission towers. This course also includes the stringing transmission that gets over the conductors before getting tensioned. The knowledge and skills provided in the units in the respective qualification require legal requirements like, licensing and certification needs which must be confirmed before the commencement of the qualification. The peak of the transmission tower that includes the part of the above top cross arm is called the peak of the transmission tower. A transmission tower is a long structure that gives the application for supporting an overhead power line. In electrical grids, they are applied to carry voltage transmission lines that transfer bulk electric power for the generation of power stations to electrical substations utility poles which are used for supporting lower-voltage distribution and sub-transmission lines that take part in the transportation of power from electric customers to substations.

The transmitting towers need to carry the large transmission conductors at a sufficient safe height from the ground. To add some more information to it, every tower needs to sustain all kinds of new calamities. Therefore transmission tower design is a necessary engineering job where civil, electrical and mechanical concepts apply to an equal amount. A power transmission tower is an important part of a power transmission system. The power transmission tower consists of the different parts followed:

1. Transmission tower belonging cross arm
2. Transmission tower’s peak
3. Transmission tower’s boom
4. Transmission tower’s cage
5. Body of the transmission tower
6. Transmission tower’s leg
7. Baseplate and anchor bolt of the transmission tower’s assembly

The mentioned parts are explained below:

1. Cross Arm

The cross arms of the transmission tower keep the conductor of transmission. The dependency on the level of voltage required by the transmission through the cross arm is found in the dimension, minimum forming and configuration angle for the distribution of stress is required.

The segments from the bottom cross arms are marked up to the base level is known as the transmission tower body. The portion of this tower plays an important role in the maintenance of the required ground clearance of the last level of conductor belonging to the transmission line.

2. Tower design

In the course of designing a transmission tower the known points are required to be focused and considered in the person’s mind as follows:

1. The length of the string of the insulator.
2. The least ground clearance of the last bottom line conductor point is situated above the ground level.
3. The location and placement of a ground wire with concern to the utmost situated conductors.
4. The least clearance has to be maintained among the conductors and between the tower and conductor.
5. The midspan clearance level is required from considerations of the dynamic behaviour belonging to the conductor and protection of the lighting of the power line.

The determination of the real transmission tower height by the consideration the above points, that is further divided to the total height of the tower in different parts:

1. Overhead conductor maximum sag.
2. The least minimum level of ground clearance.
3. Vertical clearance among the top conductor and ground wire.
4. Vertical spacing among the bottom conductors and top-level conductors.

The maximum range or value of the voltage of the transmission line, the more the ground clearance and vertical spacing leads to be higher in the voltage towers with higher permissible ground clearance and greater spacing vertically between the bottom and top-level conductors.

3. Different types of transmission towers electrically

According to various considerations, there have been different types of transmitting towers.

The transmission line moves according to the available corridors. Because of the unavailability of the minimum distance that is straight corridor transmission line needs to follow the deviation from the obstruction that is faced. In the given complete length of a larger transmission line, there could be many deviation points. According to the different angle of deviation, basic four types of transmission tower is extracted that are,

1. Type A tower
2. Type B tower
3. Type C tower
4. Type D tower

According to the application of force by the conductor on the cross arms, the transmission of these towers can be further classified in different ways followed:

1. The tower is known as tangent suspension also known as type A tower
2. Tension tower or angle tower or also known as section tower. All the type C, D, and B tower belonging to the transmission towers fall in this category.

Apart from the different customized type of tower, the design of the tower for meeting special applications listed below:

These are called a special type of tower

1. Transposition tower
2. River crossing tower
3. Highway/Railway crossing tower

Based on different numbers of circuits carried by the transmission tower, which are further classified as:

1. Multi circuit tower
2. Single circuit tower
3. Double circuit tower

Description of the Qualification

The qualification gives the basic and practical skills and knowledge in the application and working strategy in the electricity supply industry as a worker in the transmission line. The qualification takes and covers all the techniques and theoretical based theories in the structures and transmission towers. This course also includes the stringing transmission that gets over the conductors before getting tensioned. The knowledge and skills provided in the units in the respective qualification require legal requirements like, licensing and certification needs which must be confirmed before the commencement of the qualification. The peak of the transmission tower that includes the part of the above top cross arm is called the peak of the transmission tower.

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