The main support unit of the overhead transmission line is the transmission tower. Transmission towers must carry heavy transmission conductors from the ground at sufficient safe height. In addition, all towers must withstand various natural disasters. Therefore, the design of transmission tower is an important engineering work, and the three basic engineering concepts, civil engineering and electromechanical engineering concepts are also applicable.
Components of transmission tower
1. Peak value of transmission tower
2. Cross arm of transmission tower
3. Transmission tower arm
4. Transmission tower cage
5. Transmission tower body
6. Transmission tower body
7. Pile / anchor bolt and bottom plate assembly of transmission tower.
Transmission tower peak
The part above the top cross arm is called the transmission tower peak. Generally, the grounding shield wire is connected to the top of this peak.
Cross arm of transmission tower
The cross arm of the transmission tower holds the transmission conductor. The size of the cross arm depends on the level of the transmission voltage, the configuration and the minimum forming angle of the stress distribution.
Transmission tower cage
The part between the tower body and the peak is called the transmission tower cage. This part of the tower holds the cross arm.
Transmission tower body
The part from the bottom to the ground is called the transmission tower. This part of the tower plays a vital role in maintaining the required ground clearance of the bottom conductor of the transmission line.
Transmission tower design
When designing the transmission tower, the following points shall be noted:
1. The minimum ground clearance of the lowest conductor point above the ground plane.
2. Length of insulator string.
3. Minimum clearance between conductors and between conductors and tower.
4. Position of the ground wire relative to the outermost conductor.
5. The dynamic behavior of the conductor and the mitigation protection of the line shall be taken into account in the middle span gap.
Components of transmission tower
1. Peak value of transmission tower
2. Cross arm of transmission tower
3. Transmission tower arm
4. Transmission tower cage
5. Transmission tower body
6. Transmission tower body
7. Pile / anchor bolt and bottom plate assembly of transmission tower.
Transmission tower peak
The part above the top cross arm is called the transmission tower peak. Generally, the grounding shield wire is connected to the top of this peak.
Cross arm of transmission tower
The cross arm of the transmission tower holds the transmission conductor. The size of the cross arm depends on the level of the transmission voltage, the configuration and the minimum forming angle of the stress distribution.
Transmission tower cage
The part between the tower body and the peak is called the transmission tower cage. This part of the tower holds the cross arm.
Transmission tower body
The part from the bottom to the ground is called the transmission tower. This part of the tower plays a vital role in maintaining the required ground clearance of the bottom conductor of the transmission line.
Transmission tower design
When designing the transmission tower, the following points shall be noted:
1. The minimum ground clearance of the lowest conductor point above the ground plane.
2. Length of insulator string.
3. Minimum clearance between conductors and between conductors and tower.
4. Position of the ground wire relative to the outermost conductor.
5. The dynamic behavior of the conductor and the mitigation protection of the line shall be taken into account in the middle span gap.
In order to determine the actual transmission tower height by considering the above points, we divide the total height of the tower into four parts:
1. Minimum allowable ground clearance (H1)
2. Maximum sag of conductor (H2)
3. Vertical spacing between top and bottom conductors (H3)
4. Vertical clearance between ground wire and top conductor (H4).
Transmission tower type
According to different considerations, there are different types of transmission towers.
Transmission line according to available corridor. Due to the unavailability of the shortest distance, the direct corridor transmission line must deviate from its straight direction when the congestion comes. There may be multiple deviation points in the total length of the long transmission line.
There are four types of transmission towers according to the deviation angle:
Type a tower - deviation angle 0 to 2 degrees.
Type B tower - deviation angle 2 degrees to 15 degrees.
Type C tower - deviation angle 15 degrees to 30 degrees.
Type D tower - deviation angle 30 to 60 degrees.
According to the force exerted by the conductor on the cross arm, the transmission tower can be classified in another way:
Tangent suspension tower, generally type a tower.
Angle tower or tension tower or sometimes referred to as section tower. All transmission towers of type B, C and d fall into this category.
HENGFENGYOU ELECTRIC GROUP, is an electrical enterprise with transmission and distribution industry as its main business, integrating product research and development, manufacturing and trade. Designated suppliers for the world's top 500 enterprises .Its main products include power transformers, medium and low voltage switchgear, distribution panel ,circuit breakers, transmission tower ,Cable and other power distribution equipment , HENGFENGYOU ELECTRIC GROUP has been working hard to provide the best transmission, distribution solutions for users all over the world. ( www.transmission-tower.com ; sales@hengfengyou.com ； WhatsApp：+86158 5325 2696（Jack） +86158 5326 5269（Alisa）)
1. Minimum allowable ground clearance (H1)
2. Maximum sag of conductor (H2)
3. Vertical spacing between top and bottom conductors (H3)
4. Vertical clearance between ground wire and top conductor (H4).
Transmission tower type
According to different considerations, there are different types of transmission towers.
Transmission line according to available corridor. Due to the unavailability of the shortest distance, the direct corridor transmission line must deviate from its straight direction when the congestion comes. There may be multiple deviation points in the total length of the long transmission line.
There are four types of transmission towers according to the deviation angle:
Type a tower - deviation angle 0 to 2 degrees.
Type B tower - deviation angle 2 degrees to 15 degrees.
Type C tower - deviation angle 15 degrees to 30 degrees.
Type D tower - deviation angle 30 to 60 degrees.
According to the force exerted by the conductor on the cross arm, the transmission tower can be classified in another way:
Tangent suspension tower, generally type a tower.
Angle tower or tension tower or sometimes referred to as section tower. All transmission towers of type B, C and d fall into this category.
HENGFENGYOU ELECTRIC GROUP, is an electrical enterprise with transmission and distribution industry as its main business, integrating product research and development, manufacturing and trade. Designated suppliers for the world's top 500 enterprises .Its main products include power transformers, medium and low voltage switchgear, distribution panel ,circuit breakers, transmission tower ,Cable and other power distribution equipment , HENGFENGYOU ELECTRIC GROUP has been working hard to provide the best transmission, distribution solutions for users all over the world. ( www.transmission-tower.com ; sales@hengfengyou.com ； WhatsApp：+86158 5325 2696（Jack） +86158 5326 5269（Alisa）)