John Aitken, Aitken & Partners Consulting Engineers - Electromagnetic Compatibility (EMC) for safety

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John Aitken BE MIRSE SMIEEE, Director, Aitken & Partners Consulting Engineers delivered the presentation at ARA’s Telecommunications & Train Control Conference 2014.

The ARA’s Telecommunications & Train Control Conference 2014 brought together passenger and freight rail operators, transport agencies, track owners, regulators and technology suppliers to assess telecommunications solutions and explored the capabilities of a shared future.

For more information about the event, please visit: http://bit.ly/traincontrol14

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John Aitken, Aitken & Partners Consulting Engineers - Electromagnetic Compatibility (EMC) for safety

  1. 1. EMC for Safety John Aitken Aitken & Partners
  2. 2. Electromagnetic Compatibility Ability to function satisfactorily in its electromagnetic environment
  3. 3. Electromagnetic Compatibility Ability to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment. IEC 600500-826
  4. 4. “… must be designed, built and maintained with regard to EMC in order that they operate safely throughout their operational life.
  5. 5. Safety Freedom from unacceptable risk of harm. EN 50126
  6. 6. unacceptable risk of harm
  7. 7. Disturbances
  8. 8. intolerable disturbances
  9. 9. conducted disturbance
  10. 10. Midya
  11. 11. Midya
  12. 12. inductive disturbance
  13. 13. Armstrong
  14. 14. Hill
  15. 15. radiated disturbance
  16. 16. EN 50238
  17. 17. Simple concept
  18. 18. ✗ Don’t let unwanted energy out of component
  19. 19. Don’t let unwanted energy into component
  20. 20. Minimise unwanted energy Make systems compatible ✗
  21. 21. safety margin
  22. 22. Standards • EN 50121 – Railway System • EN 50238 – Train Detection • EN 50500 – Effects on People • ARPANSA No 3 – Australian Law
  23. 23. Standards • Precise tests of one thing at a time • Repeatable results • Laboratory conditions • Nothing like a railway!
  24. 24. EN 50121 • Part 1 – General • Part 2 – Emission of the entire railway • Part 3 - 1 Rolling Stock – Train • Part 3 – 2 Rolling Stock – Components • Part 4 – Signalling and Telecommunications • Part 5 – Fixed Power.
  25. 25. Immunity Standards
  26. 26. Immunity Standards
  27. 27. Radiated Emissions
  28. 28. Conducted Emissions
  29. 29. ECP – Right side failure Sudden, unexplained emergency brake application
  30. 30. Often at the same place – but not always
  31. 31. Many Observations • Only with ECP • Not always, but usually in electrified area • Usually associated with dynamic brake • More often on the steep grades on the mountain range • Happens sometimes when you cut off power • Very frequently at the port.
  32. 32. The cause – traction harmonics • Always there: – Absorbed into traction circuit under load – Distributed on overhead system when in dynamic brake or stationary
  33. 33. Finding the problem • The problem was found – a design issue in a power supply. • The balanced line for ECP was not balanced at all frequencies because the power supply designer put in a component to pass an EMC test. The component shunted unwanted frequencies from the power supply to ground.
  34. 34. Finding the problem • The problem was found – a design issue in a power supply. • The balanced line for ECP was not balanced at all frequencies because the power supply designer put in a component to pass an EMC test. The component shunted unwanted frequencies from the power supply to ground.
  35. 35. Good design • Standards prescribe tests to identify known problems • The tests cover a limited number of circumstances • Tests are done sequentially. • Real life is not like that. Things happen. • They don’t check the standards first! • Careful, consistent design is essential.
  36. 36. Thank you

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