About Lesson
Key Components of Lightning Protection Systems
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Lightning Arresters
- Function: Divert high-voltage lightning surges to the ground, protecting equipment from overvoltages.
- Types: Metal oxide varistor (MOV), silicon carbide, and multi-gap arresters.
- Placement: Installed at strategic locations such as near transformers, circuit breakers, and busbars.
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Shield Wires
- Function: Provide a direct path to the ground for lightning strikes, protecting the underlying equipment.
- Installation: Strung above switchyard equipment, supported by poles or towers.
- Material: Typically made of galvanized steel or aluminum.
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Air Terminals (Lightning Rods)
- Function: Provide a preferred point for lightning to strike, channeling the current safely to the ground.
- Placement: Installed on top of high structures like control buildings and gantries.
- Design: Made of conductive materials such as copper or aluminum.
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Grounding System
- Function: Dissipate lightning currents safely into the earth.
- Components: Ground rods, grounding conductors, and ground grids.
- Design Considerations: Low-resistance path to ensure efficient current dissipation.