Typical Modelling Applications

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EMC Modelling can be useful at design stage or as an investigative tool when suspected interference needs to be investigated. Broadly speaking there are two types of scenario where modelling is often undertaken:

  1. An EMC test scenario such as a radiated emissions or radiated immunity test is modelled and the field at an appropriate test distance is calculated. This type of modelling is often undertaken on an intentional transmitter to assess the likelihood of disturbance to neighbouring electronic equipment or the threat to human safety. [1]
  2. Long parallel runs of cable lead to cross talk from one to the other. This can lead to unexpectedly high voltages occurring on the victim cable. A good example of this is the case of the 25kV AC feeder cables used to supply power to trains. Line side cables used for telephony and signalling purposes can have significant voltages induced on them. The primary design objective in this scenario is to limit the induced voltages on line side cables to below 60V AC [2][3].

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  1. ICNIRP Guidelines, ‘Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields up to 300GHz’ Health Physics Vol. 74, No 4, pp 494-522, 1998. (Available from the ICNIRP website, 612 kB PDF; also in German, Japanese, French, Italian & Spanish)
  2. ITU-T Recommendation K.53, ‘Values of induced voltages on telecommunication installations to establish telecom and AC power and railway operators responsibilities’
  3. British Railways Board BR 13422, ‘Code of practice for immunisation of signal and telecommunication equipment against 25kV 50Hz interference’

Last Updated: 2004-Oct-21