Lightning protection for industrial and commercial buildings

Goals

The objectives of the training Lightning protection for industrial and commercial buildings :

At the end of this training course, trainees will be able to analyse the effects of lightning on industrial and tertiary facilities and implement appropriate protection measures.

This training course provides a solid technical foundation for conducting Lightning Risk Analyses (LRA) and Lightning Technical Studies (LTS) in accordance with standard NF EN 62305. It also offers simplified risk analysis methods in accordance with FD C17-108 and UTE 15-443.

The aim of this training course is to:

• Be able to understand EMC and its impacts


• Know how to analyze the lightning phenomenon and its effects


• Master the principles of protection against direct and indirect strikes


• Know how to implement protective measures


• Know how to choose and implement the various surge arresters and coordination methods

Program

1 – General information
• Lightning in figures
• Lightning and mythology
• Lightning and early research
• Mechanism of direct lightning strikes on humans
• Lightning protection: Standardization and regulations
• EMC characterization of equipment
• Common mode / Differential mode
• Time-frequency conversion


2 – Lightning phenomena
• Storm system
• Charge separation mechanism
• The lightning cloud
• Precursor phenomena
• Atmospheric discharge
• Typical values for a lightning strike
• EN 62305: Waveform
• Protection levels according to EN 62305
• Average energy and power of lightning
• Lightning strike density
• Risk assessment
• Simplified lightning risk analysis
• Direct risk / Indirect risk
• Ball lightning


3 – The effects of lightning
• Effects on an insulating structure
• Effects on conductors
• Elevation in ground potential
• Radiated effect of a lightning strike
• Voltage developed in metal structures
• Effect of a direct strike on overhead lines
• Lightning induction: electrostatic effect
• Effect of a direct strike on LV distribution


4 – Lightning protection: external structure
• General principle
• Electrogeometric model
• Fictitious sphere method
• Protection angle
• Capture points
• Protection by meshing
• Protection by tensioned wires
• Down conductors
• Earth
• Interconnection of metal structures


5 – Protection of internal connections
• Ground network
• Ground loops / loops between grounds
• Meshing of ground conductors
• Principle of the reducing effect
• Implementation of shielded cables
• Use of cable trays


6 – Protection of external connections
• Origin of external surges
• Connections between buildings
• Penetration into a building
• Spark gaps
• Varistor
• Transil / Trisil
• Principle of staged protection
• Coordination of protection
• Protection of an antenna cable
• Quarter-wave stub
• Choosing the type of surge arrester
• Type 1 surge arrester
• LV surge arrester parameters
• Type 2 surge arrester
• Signal surge arresters
• Implementation of surge arresters
• UTE 15-443 guide
• Installation of power/telecom surge arresters
• Combined mains + telephone surge arresters