What are the different methods and equipment used for guarding overhead lines?

2025-08-10

Guarding methods and equipment vary depending on the specific application and voltage level. Common equipment includes:

  • Line Guards: Helical or rigid guards made of non-conductive materials that wrap around conductors to protect against abrasion, mechanical damage, and bird strikes.

  • Guard Ropes or Wires: These are typically installed above the live conductors to intercept lightning strikes, protecting the main power lines. They can also serve a dual purpose as Optical Ground Wire (OPGW), which provides both lightning protection and a communication link.

  • Barriers and Warning Devices: Elevated warning lines, flags, and physical barricades are used to establish a safety zone and a minimum approach distance for workers and machinery operating near power lines, especially during construction or maintenance.

  • Insulating Protective Equipment: Tools like insulating covers, line hoses, and rubber blankets are used by qualified personnel to temporarily guard live conductors during maintenance.

  • Grounding and Earthing Equipment: Temporary protective earthing (grounding) equipment is essential during maintenance to protect workers from induced voltages and inadvertent energization.

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