overhead line towers are classified primarily by their structural function and design. The four main types are:

• Suspension Towers: These are the most common type and are used on straight sections of a power line. They hold the conductors in a vertical position (suspended) and are designed to handle downward weight and light horizontal wind loads.

• Tension Towers (or Strain Towers): These are built to withstand the high mechanical tension of the conductors. They are installed at points where the line changes direction (angles), at a dead end, or where there is a long span.

• Transposition Towers: Used on very long lines, these towers are designed to physically change the position of the conductors (transposition) to help balance the electrical inductance and capacitance of the line.

• Terminal Towers: These are a specialized type of tension tower placed at the end of a line, such as where a line connects to a substation or another line.

The choice of tower type is crucial for the safety and stability of the entire power grid.