EMC of systems and installations

Goals

formation-objectifs-seointro EMC of systems and installations :

- Take into account all key EMC parameters when wiring and implementing an industrial system

The aim of this training course is to:
- Learn how to identify EMC risks for a system or installation
- Be able to identify the main sources of interference
- Know how to recognise and understand the coupling mechanisms involved
- Master the appropriate protection methods and their industrial implementation
- Know how to adopt an approach to solving EMC problems

Program

1/ Introduction
EMC in industrial systems
Definitions / units
Developments in electronics
Envelope detection
Emission / susceptibility reciprocity
Time / frequency reciprocity

2/ Conducted disturbances
Differential mode disturbances
Common mode disturbances
Common impedance
Equipotentiality of masses
Impedance of a mesh
Board-to-chassis coupling
Crosstalk

3/ Radiated disturbances
What is an EM field?
Electric/magnetic field
Field propagation and reflection
Effect of EM fields on electrical conductors
Critical frequencies, orders of magnitude
Human exposure to EM fields

4/ Sources of interference
Fields emitted by radio transmitters
High-frequency industrial equipment
Electrostatic discharges
Characteristics of lightning strikes
Causes and effects of lightning
Surges when coils are opened
Sources of 50 Hz magnetic fields
Rectifier bridges
Switching power supplies
Variable speed drives

5/ Power supply
Power supply quality
Impact of neutral systems on EMC
TT system
TN-C and TN-S systems
IT system

6/ Earthing
Roles of earth, neutral and PE
Are multiple earth connections necessary?
Earth resistance measurements
Setting up an earth network
Protecting a building against lightning
Connecting a lightning conductor to earth

7/ Grounding networks
Regulations and earthing
Star grounding and ground loops
Effect of ground loops
Mesh grounding network
Equipment grounding
Island wiring: cabinets, technical rooms
Ground connections

8/ Interconnection cables
Principle of the reducing effect
Cable shielding
Where to connect the screens?
New best practices
Implementation of connectorsLow-level connectionsLow-level connections
Digital connections
Galvanic isolation
Isolation transformers
Cable trays and conductive structures
ImplementationCable route classification, cabling rules
Specific cases

9/ Protection and filtering
Surge arresters
Spark arresters / surge arresters / limiters
Installation of surge arresters
Selection and installation of a mains filter
Role of ferrites
Selection and implementation of ferrites

10/ Screens and shielding
Role and operation of shielding
Shielding leaks
Treatment of openings
Conductive seals, contacts, continuity
Examples of magnetic screens
Practical solutions

11/ Installation
Choosing EMC solutions
Structural meshing
Conductor penetrations
Coordination of protections
Copper or fibre optic connections?

12/ Validation
How to assess the immunity of a system?
Checking ground connections
On-site immunity tests
Choosing a test generator
Immunity to fast transient bursts
Immunity to walkie-talkies

13/ Remèdes
EMC faults: what should you do?
On-site diagnostics and analysis
Correction method
Specific instrumentation
Use of HF current clamps
Use of Moebius probes
Orders of magnitude, examples of remedies
Practical case study