Electrical Transmission Tower Types and Design _ Electrical4u

Electrical Transmission Tower Types and Design | Electrical4u file:///C:/Users/ravindra.barve/Desktop/TL tower introduction/Elec... ≡ Electrical Transmission Tower Types and Design Next » The main supporting unit of overhead transmission line is transmission tower. Transmis- sion towers have to carry the heavy transmission conductor at a sufficient safe height from ground. In addition to that all towers have to sustain all kinds of natural calamities. So transmission tower designing is an important engineering job where all three basic en- gineering concepts, civil, mechanical and electrical engineering concepts are equally appli- cable. A power transmission tower consists of the following parts, 1. Peak of transmission tower 2. Cross arm of transmission tower 3. Boom of transmission tower 4. Cage of transmission tower 5. Transmission Tower Body 6. Leg of transmission tower 7. Stub/Anchor Bolt and Base plate assembly of transmission tower. The main parts among these are shown in the pictures. Peak of Transmission Tower The portion above the top cross arm is called peak of transmission tower. Generally earth shield wire connected to the tip of this peak. Cross Arm of Transmission Tower Cross arms of transmission tower hold the transmission conductor. The dimension of cross arm depends on the level of transmission voltage, configuration and minimum forming an- gle for stress distribution. Cage of Transmission Tower The portion between tower body and peak is known as cage of transmission tower. This portion of the tower holds the cross arms. Transmission Tower Body The portion from bottom cross arms up to the ground level is called transmission tower body. This portion of the tower plays a vital role for maintaining required ground clearance of the bottom conductor of the transmission line. 1 of 6 7/5/17, 9:27 AM The minimum clearance to be maintained between conductors and between conductor 2 of 6 7/5/17.Electrical Transmission Tower Types and Design | Electrical4u file:///C:/Users/ravindra. The minimum ground clearance of the lowest conductor point above the ground level.. 9:27 AM .. The length of the insulator string.barve/Desktop/TL tower introduction/Elec. Design of Transmission Tower During design of transmission tower the following points to be considered in mind. Vertical clearance between ground wire and top conductor (H4). Apart from the above customized type of tower. Multi circuit tower. Tangent suspension tower and it is generally A .type tower. All B. Angle tower or tension tower or sometime it is called section tower. Minimum permissible ground clearance (H1) 2. 1. 2.. A – type tower – angle of deviation 0o to 2o. 3. Due to unavailability of shortest dis- tance straight corridor transmission line has to deviate from its straight way when ob- struction comes. Single circuit tower 2. 2. Vertical spacing between top and bottom conductors (H3) 4. C – type tower – angle of deviation 15o to 30o.barve/Desktop/TL tower introduction/Elec. the tower is designed to meet special us- ages listed below. Types of Transmission Tower According to different considerations. The mid span clearance required from considerations of the dynamic behavior of con- ductor and lightening protection of the line. The location of ground wire with respect to outer most conductors. To determine the actual transmission tower height by considering the above points. According to the angle of deviation there are four types of transmission tower- 1. C and D types of transmission towers come under this category. B – type tower – angle of deviation 2o to 15o. D – type tower – angle of deviation 30o to 60o. Double circuit tower 3. 9:27 AM . As per the force applied by the conductor on the cross arms.. 4. and tower. Transposition tower Based on numbers of circuits carried by a transmission tower. the transmission towers can be categorized in another way- 1. there are different types of transmission towers. Railway/ Highway crossing tower 3. These are called special type tower 1. The transmission line goes as per available corridors.Electrical Transmission Tower Types and Design | Electrical4u file:///C:/Users/ravindra. Maximum sag of the conductor (H2) 3. In total length of a long transmission line there may be several deviation points. we have divided the total height of tower in four parts. it can be classisfied as- 1. River crossing tower 2. 3 of 6 7/5/17. . 9:27 AM ..Electrical Transmission Tower Types and Design | Electrical4u file:///C:/Users/ravindra.barve/Desktop/TL tower introduction/Elec. 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