Lightning protection for industrial and commercial buildings

Goals

formation-objectifs-seointro Lightning protection for industrial and commercial buildings :

- Analyse the effects of lightning on industrial and tertiary installations
- Implement appropriate protection measures

The aim of this training course is to:
- Be able to understand EMC and its impacts
- Know how to analyse 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 different 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: Standardisation and regulations

EMC characterisation of equipment

Common mode / Differential mode

Time-frequency conversion

2/ Lightning phenomenon

Thunderstorm system

Charge separation mechanism

The lightning cloud

Preliminary phenomena

Atmospheric discharge

Typical values for a lightning strike

EN 62 305: Waveform

Protection levels according to EN 62 305

Average energy and power of lightning

Lightning density

Risk assessment

Simplified lightning risk analysis

Direct risk / Indirect risk

Ball lightning

3/ Effects of lightning

Effects on insulating structures

Effects on conductors

Potential rise at ground level

Effect of a direct strike on overhead lines

Lightning induction: electrostatic effect

Effect of a direct strike on low-voltage distribution

Radiation from an indirect lightning strike



4/ Lightning protection: external structure

General principle

Electrogeometric model

Fictitious sphere method

Capture devices

Down conductors

Earth

Mesh



5/ Protection of internal connections

Ground loops / loops between grounds

Mesh of ground conductors

Reducing effects

Installation ofof shielded cables

Implementation of cable trays



6/ Protection of external connections

Inter-building transmission

Copper or fibre optic connections?

Penetration into a building

Protection of an antenna cable

Splitters

Varistors

Transil / Trisil

Quarter-wave stub

Sizing a varistor

Sizing a transzorb

Need for coordination of protection devices

Installation of surge arrestersClassification of LV surge arresters

Parameters of LV surge arresters

Choice of Uc and Ut voltages for surge arresters

Implementation of mains protection

Protection of data connections

Installation of energy/telecom surge arresters

Combined mains + telephone surge arresters

Lightning protection for an antenna lead-down