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Functional earthing of electronic devices

Functional earthing of electronic devices. IEC 60050-195. IEC EN 60617-2. 02-15-01. IEC EN 60617-2. 02-15-03 02-15-04. Theoretical background. Leakage currents. Theoretical background. Leakage currents. Theoretical background. Leakage currents. Theoretical background.

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Functional earthing of electronic devices

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  1. Functional earthingof electronic devices

  2. IEC 60050-195

  3. IEC EN 60617-2 02-15-01

  4. IEC EN 60617-2 02-15-03 02-15-04

  5. Theoretical background Leakage currents

  6. Theoretical background Leakage currents

  7. Theoretical background Leakage currents

  8. Theoretical background Leakage currents

  9. Theoretical background Leakage currents

  10. Leakage currents – VSD Inverter 20 kVA

  11. Leakage currents – VSD Inverter 20 kVA

  12. Standards requirements IEC 364 - 7 - 707 Earthing requirements for the installation of data processing equipment • Leakage current > 3,5 mA (EN 60950) • Also non data processing equipment • Safety art. 707.4 • Low noise art. 707.5

  13. IEC 364 - 7 - 707 requirements • Leakage currents < 10 mA → particular requirements for reliability of protective conductor • Leakage currents > 10 mA → additional requirements for reliability of protective conductor i.e. • High integrity connection • Earth continuity monitoring • Use of transformers • Additional requirements for TT and IT systems • Single earthing system • Simultaneously accessible exposed conductive parts

  14. IEC 364 - 7 - 707 requirements <10mA TN(-S) • Art. 707.471.3.2 Equipment shall be: • stationary and • Either permanently connected to the building wiring installation or connected via industrial plugs and sockets (IEC Publication 309-1)

  15. IEC 364 - 7 - 707 requirements >10mA • High integrity protective circuits • High integrity connection • Earth continuity monitoring • Use of transformers

  16. IEC 364 - 7 - 707 requirements >10mA High integrity protective circuits (Art.707.471.3.3.1) • One conductor with cross-sectional area of not less than 10 mm2 • Two conductors with independent terminations, each having a cross-sectional area of not less than 4 mm2 • Multicore cable: the sum total cross-sectional area of all the conductors shall be not less than 10mm2, so that protective conductor cross-sectional area will be not less than 2,5 mm2 • To the main earthing terminal

  17. IEC 364 - 7 - 707 requirements >10mA Earth continuity monitoring (Art.707.471.3.3.2) • A device or devices shall be provided which will disconnect the equipment in the event of a discontinuity occurring in the protective conductor

  18. IEC 364 - 7 - 707 requirements >10mA Use of transformers (Art. 707.471.3.3.3)

  19. IEC 364 - 7 - 707 requirements >10mA Use of transformers (Art. 707.471.3.3.3) • Auto-transformers are not permitted • Secondary circuit should be connected as TN-S • Integrity of protective conductor

  20. IEC 364 - 7 - 707 requirements Additional requirements for TT systems (Art. 707.471.4)

  21. IEC 364 - 7 - 707 requirements Additional requirements for IT systems (art. 707.471.5) • Difficulty of satisfying touch voltage requirements after a first fault • Where possible the equipment should be supplied by a TN system derived from the IT mains supply by means of a double wound transformer

  22. IEC 364 Part 1 requirements 132 – Electrical installations design […] to ensure: • protection … • correct operation for the expected use

  23. Theoretical background Low noise equipotential bonding Capacitive disturbances

  24. Theoretical background Low noise equipotential bonding Capacitive disturbances

  25. Theoretical background Low noise equipotential bonding Inductive disturbances

  26. Theoretical background Low noise equipotential bonding Inductive disturbances

  27. Theoretical background Low noise equipotential bonding Conducted disturbances

  28. Theoretical background Low noise equipotential bonding Conducted disturbances

  29. Theoretical background Low noise equipotential bonding Conducted disturbances

  30. Theoretical background Low noise equipotential bonding Conducted disturbances

  31. Theoretical background Low noise equipotential bonding Conducted disturbances

  32. IEC 364 - 7 – 707 requirements Low noise equipotential bonding Comments on Art. 707.5 • Requirements related to protective measures must take precedence • Independent earthing systems for exposed conductive parts not contemporaneously accessible

  33. IEC 364 - 7 – 707 requirements Low noise equipotential bonding (comments on Art. 707.5) • Separation of sensitive and disturbing circuits • Avoid parallelisms • Line balance • Shields and double shields • Differentiated conductors

  34. IEC 364 - 7 – 707 requirements • Low noise equipotential bonding • (comments on Art. 707.5) • Differentiated conductors

  35. Further resources • Power Quality Application Guide • Power Quality Digital Library • EPQU Magazine & Journal • Webcasts • Minute briefings • Web events & training • Sustainable Energy Blog • Subscribe • This presentation is also available as a download from this site’s “resources” button.

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