Time-domain measurement technique to analyze cyclic short-time interference in power supply networks

Conducted interference caused by equipment connected to power supply networks, and the interference in these networks, is conventionally measured using (slow) scanning tuned electromagnetic interference (EMI) receivers. A voltage sensor which separates common mode and differential mode in a three-phase setup combined with a 8-channel digital oscilloscope allows measuring voltage and current via many samples in the three phases plus neutral. Using fast fourier transform for the data processing the conventional amplitude-as-function-of-frequency plots, similar to what would be obtained using conventional EMI receivers, can be generated. But with the presented measurement technique it is also possible to present time-frequency plots in a waterfall diagram. The time - domain measurement technique shows that the conducted noise is cyclic short-time interference.

[1]  A. S. de Beer,et al.  Effects of LED lamps on the power-line communications channel , 2013, 2013 IEEE 17th International Symposium on Power Line Communications and Its Applications.

[2]  R. B. Timens,et al.  Time domain methods for the analysis of conducted interference on the power supply network of complex installations , 2014, 2014 International Symposium on Electromagnetic Compatibility.

[3]  Stephan Braun.  Spectrum analysis and EMI measurements based on time-domain methods , 2010, 15th Conference on Microwave Techniques COMITE 2010.

[4]  Peter Russer,et al.  A novel Digital Quasi-Peak Detector for Time-Domain Measurements , 2003, 2003 33rd European Microwave Conference, 2003.

[5]  Marc Pous,et al.  Time-Domain Electromagnetic Interference Measurement System for intermittent disturbances , 2014, 2014 International Symposium on Electromagnetic Compatibility.

[6]  Thales Nederland.  Time domain methods for the analysis of conducted interference on the power supply network of complex installations , 2014 .

[7]  V. Cuk,et al.  Large number of small non-linear power consumers causing power quality problems , 2011, 10th International Symposium on Electromagnetic Compatibility.

[8]  H. C. Ferreira,et al.  The impact of the CFL lamps on the power-line communications channel , 2013, 2013 IEEE 17th International Symposium on Power Line Communications and Its Applications.

[9]  Luís Díez del Río,et al.  Analysis of the cyclic short-term variation of indoor power line channels , 2006, IEEE Journal on Selected Areas in Communications.

[10]  Jing Lin,et al.  Cyclic spectral analysis of power line noise in the 3–200 kHz band , 2013, 2013 IEEE 17th International Symposium on Power Line Communications and Its Applications.

[11]  S. Cakir,et al.  Improving time-domain EMI measurements through digital signal processing , 2015, IEEE Electromagnetic Compatibility Magazine.

[12]  Sergio A. Pignari,et al.  Device Modeling for Nonstationary Conducted Emissions Based on Frequency- and Time-Domain Measurements , 2012, IEEE Transactions on Electromagnetic Compatibility.

[13]  DWT analysis of high order harmonics influence over distorted regimes with fast variable loads , 2015, 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC).

[14]  Marc Heddebaut,et al.  Time-frequency processing adapted for the different electromagnetic compatibility issues in the railway domain , 2015, 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC).

[15]  Yuang-Shung Lee,et al.  Time Domain Measurement System for Conducted EMI and CM/DM Noise Signal Separation , 2005, 2005 International Conference on Power Electronics and Drives Systems.

[16]  P. Russer,et al.  CISPR specification and measurement uncertainty of the time-domain EMI measurement system , 2008, 2008 IEEE International Symposium on Electromagnetic Compatibility.