On the Concept of Grounding Impedance of Multipoint Grounding Systems

An N-port equivalent circuit approach is adopted to model a multipoint grounding system, N being the number of injection points. A methodology is proposed to determine the parameters of the N-port equivalent circuit from either numerical simulations or experimental measurements. For the case of a symmetrical grounding system, analytical closed-form expressions are derived for the equivalent parameters of the N-port circuit. We show that the concept of the equivalent input impedance (harmonic impedance) could be used in the case of a symmetrical multipoint grounding system. We show also that the experimental evaluation of the impedance of a grounding system using a single injection point is a conservative engineering practice, since the obtained impedance might be overestimated at high frequencies.


Published in:
IEEE Transactions on Electromagnetic Compatibility, 56, 6, 1540-1544
Year:
2014
ISSN:
1558-187X
Keywords:
Laboratories:




 Record created 2014-12-17, last modified 2018-03-17


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