Transmission Line Tower

Transmission Line Tower Parts

Every transmission line tower by electric tower manufacturers is a precision-engineered system composed of critical load-bearing parts. Understanding these components ensures proper maintenance and procurement decisions:

1. Tower Body Structure

• Leg Members (Angles): Hot-dip galvanized steel angles (typically L130×130×10mm) forming the primary load path.

• Cross Arms: Horizontal members supporting conductors (3-4 circuits standard).

• Bracing System: Diagonal members providing torsional stability 

2. Conductor Support Components

• Insulator Strings: Porcelain/polymer units (≤400kN mechanical rating) isolating live parts.

• Clamps & Suspension Sets: Corona-resistant alloy fittings.

3. Foundation Interface

• Base Plates: 30-50mm thick steel with anchor bolt holes.

4. Safety Add-Ons

• Danger Plates: High-voltage warning signage.

• Aircraft Warning Lights: 20-40W LED beacons.

Transmission Tower Design

Transmission tower design balances electrical requirements with structural resilience. Key considerations for engineers:

A. Electrical Parameters

• Clearance Zones: Phase-to-ground spacing.

• Shielding Angle: ≤30° for lightning protection 

B. Mechanical Load Cases

• Ultimate Limit State (ULS): Withstands 50-year extreme winds.

• Fatigue Loads: Cyclonic vibration resistance.

C. Material Specifications

• Steel Grade: 1.High strength low alloy structural steel: Q420B which is equivalent with ASTM Gr60
  2.High strength low alloy structural steels: Q355B which is equivalent with ASTM Gr50 or S355JR
  3.Carbon Structural Steel: Q235B which is equivalent with ASTM A36 or S235JR

• Corrosion Protection: Hot dip galvanizing /painting/Powder coating.

Articles about Transmission Line Tower

Transmission Tower Design, Installation, and Maintenance Guide