EMC, harmonic currents measurement

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Dr. Lénárt Ferenc
Department of Broadband Infocommunications and Electromagnetic Theory

For electronic equipment connected to the 50 Hz power distribution network, standards regulate the maximum acceptable harmonic interference, which the equipment can legally emit to the network.

In the first part of my thesis, I review the theoretical background of the problem to be solved, then the tools and methods I used to solve it. I give a short explanation of EMC as a territory of science, and the criteria of the standard that we want to check. I elaborate upon the proportion of current transformers – and generally sound frequency transformers – and the many aspects of this proportion. The main focus of this elaboration is the issue of iron cores. I review the computer programs I used, and also explain the choices of safety-related components which we can consider.

In the second part, I give full details of the work I made during the two semesters. The documentation is built in chronological order of the various calculations, measurements and considerations we made. I explain the understanding of the problem to be solved, and the wide scale of variable parameters, which meant opportunities to optimize, but also problematic treatability. I include circuit schematics of the starting and the simplified models, diagrams of the measurements and expansive calculations I made. Then I exemplify the calibration of the built-up device, and also the demonstrational measurements we made with it.


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