Lightning protection system for generating station
This article establishes guidelines for designing a lightning protection system to minimise the risk of injury to people and damage to property at a generating station. Since lightning is a natural phenomenon, total elimination of risk is not possible but the mitigation of risk is achievable.
Some definitions pertaining to lightning
• LPC: Lightning Protection Code, NFPA-78.
• Protected structure: A building or structure that has been provided with a lightning protection system or that, by its construction and grounding, is self-protecting.
• Station ground: The generating station, station ground system.
• Catenary lightning protection system: A lightning protection system consisting of one or more overhead ground wires.
• Sideflash: An electrical spark, caused by differences of potential, that occurs between conductive metal bodies or between conductive metal bodies and a component of a lightning protection system or ground
• Lightning flash to earth. Electrical discharge of atmospheric origin between cloud and earth consisting of one or more strokes.
- You cannot eliminate the risk associated with lightning.
- The risk of damage or injury, due to lightning, can be managed.
- Various standards and guidelines exist and these must be studied carefully in order to make the best design decisions
Designing a lightning protection system for a generating station
By O Bekker, Fluor
Electricity+Control, September 2012 (pgs 22 – 30)