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JWG C4.31/CIRED EMC between Communication Circuits and Power Systems

Background :

Most of the subjects covered by this Working Group are of common interest for distribution systems and transmissions systems and it is good to have a common understanding. The mechanisms causing interference from power systems on communication systems, low voltage systems and metallic structures are the same for both transmission systems and distribution systems, although parameters and conditions may differ. This Working Group will work cooperatively with the Standardization Sector of the International Telecommunication Union (ITU-T) regarding EMC with communication systems, especially telecommunication systems. One major objective of the Joint working group is to support ITU-T in the maintenance of the ITU K series Recommendations and Directives for telecommunication systems regarding interference (including damage, danger, disturbance) resulting from an induced voltage caused by high voltage and medium voltage power lines under steady state and fault conditions. In principle this is a continuous work. However, ITU-T has working periods of four years and the scope for the proposed new Joint Working Group covers the scope for the next working period 2012-2016. As ITU-T has a rolling working system, work is already ongoing on some of the activities mentioned below.

Scope :

Methods of analysis and mitigation of the influence of HV power systems on telecommunication circuits, radio communication, low voltage systems and metallic structures

1. The updating of the recommendations and guides to be consistent with, and supportive of, the ITU-T publications.

  • Rec. K.hvps1 – Method for identifying the transfer potential of EPR from HV and/or MV to the earthing system or neutral of LV network. - Sept. 2012
  • Rec. K.hvps2 – Method for identifying the effective earth current and earthing resistance of sub-stations with special view of MV/LV transformer station in urban area. - Sept. 2013
  • K.int – Interference to telecommunication transmission systems other than POTS - Sept. 2015
  • K.68 – Maintenance of Recommendation K68 aiming at the more complete coverage of the existing installations (previously K.57) - Sept. 2015
  • Dir. Vol. V – Evaluation of current harmonics in power lines - 2015
  • Dir. Vol. V – Interference to telecommunication systems by the emergence of harmonics flowing on power systems - Sept. 2015

2. Development of a guide for assessment of current harmonics in MV and LV power systems that may induce EM interference. Electric power definitions, measurement techniques, summation of random harmonic currents, the induction effects, the distinction between balanced and unbalanced type harmonics.

Deliverables :

Report to be published in Electra or technical brochure with summary in Electra: Guide for assessment of current harmonics in MV and LV power systems. Electric power definitions, measurement techniques, summation of random harmonic currents, the induction effects, the distinction between balanced and unbalanced type harmonics.

Convener : D. Thomas (UK)

Progress Report 2013 (pdf, 57kB)

Progress Report 2014 (pptx, 139kB)

Progress Report 2015 (pptx, 139kB)

Progress Report 2016 (pptx, 134kB)