Electric Steel Tower

An electric steel tower is a critical component of the power transmission infrastructure. Its primary functions are to:

Support high-voltage (HV) and extra-high-voltage (EHV) conductors at a safe height above the ground.

Maintain the required electrical clearance​ between phase conductors, ground wires (lightning protection), and the earth or other structures.

Withstand mechanical loads from the weight of the conductors, wind pressure, ice accumulation, and seismic forces.

These towers are designed to carry voltages ranging from 10kV up to 1000kV+​ (including UHV lines)

Common Types

Based on their function and configuration in the transmission line, electric steel towers are classified as:

Suspension Tower (Linear Tower): Supports the conductor under normal tension; used on straight sections of the line.

Tension Tower (Anchor Tower): Withstands full line tension; used at section ends or where the line changes direction.

Angle Tower: Used where the transmission line changes horizontal direction (corner points).

Dead-end / Terminal Tower: Located at the ends of a line (e.g., at substations) to absorb all longitudinal tension.

Transposition Tower: Used to change the phase sequence of the conductors.

Special Crossing Tower: Designed for crossing rivers, railways, or valleys with large spans.

Structurally, they can be Self-supporting​ (lattice or tubular) or Guyed (Guyed Tower).

Structural Forms

Lattice Steel Tower (Angular Steel Tower): The most common type, constructed from L-shaped angle steel​ members bolted together in a triangular or square lattice truss. Highly material-efficient and stable. (Related to your previous query: Angular Tower)

Tubular Steel Tower: Made from steel pipes (monopole or multi-leg tubular lattice); offers better aesthetics and lower wind resistance, often used in urban or coastal areas. (Related to Tubular Tower / Monopole Tower)

Steel Pole (Electric Steel Pole): Tapered or polygonal tubular poles, usually for distribution or lower-voltage transmission in compact spaces. (Related to Electric Steel Pole)

Materials & Surface Treatment

Materials: High-strength low-alloy structural steel (e.g., Q235B, Q355B, Q420​ equivalent to ASTM A36, A572 Gr50/65) and mild steel.

Connections: Bolted connections (main type for lattice towers) or flange/welded connections (for tubular poles).

Corrosion Protection: Hot-Dip Galvanizing​ (following standards like ASTM A123​ or ISO 1461) to ensure a service life of 30–50 years​ in outdoor environments.

Welding Standards: Typically comply with AWS D1.1.