Recently, various electrical equipment and radio equipment are being used in a wide range. Therefore, radio interference due to disturbance waves radiated from such equipment are now public concerns in general. The problem of these radio interference phenomena is discussed internationally, and many international standards have been established on the measuring methods and limits for the strength of radiated disturbance waves. Electric traction systems will potentially radiate disturbance waves to cause radio interference (CISPR) and IEC Technical Committee 9 (IEC/TC9: Railway Applications) are separately standardizing the measuring method and limits for Electromagnetic Compatibility (EMC) on electric traction systems. The radio interference from electric traction systems has been discussed by CISPR, and a draft of CISPR Publication (standardized document) is being draw up. Although IEC/TC9 had to cooperate with CISPR in developing an international standard for EMC on electric traction systems, however IEC/TC9 has unilaterally circulated the committee draft for international vote (CDV) that contains the European standard for EMC on electric traction systems. This paper outlines the discussions in CISPR and IEC/TC9 on radio interference from electric traction systems and introduces international trends into the future.

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