Calculation of Radiated Emissions from Power Line with Four Port Network Theory

概要

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We measured the degree of unbalance to ground and the leaked electric field from a power line in the high frequency band, to obtain its radiation emission characteristics. We also constructed a calculation model for the power line and compared the results from this with measured values. It was constructed using four port network theory, which has the circuit constant as the chain matrix of the distributed constant on a transmission line. The structural unbalance of a power line was imitated by adjusting the additive distributed constant of a power line so that the calculated and measured values agreed with each other for Transverse Conversion Transfer Loss (TCTL) in the no grounding model. In calculating the leaked electric field, we assumed the power line was a conductor flowing common mode current, and calculated the leaked electric field by integrating radiated emissions from the common mode current in each minute section at the observation point. The calculated value for TCTL was mostly in agreement with the measured value confirming the validity of the calculation methods for TCTL. The leaked electric field increased about 20dB by grounding one wire on the line. The calculated value for the leaked electric field with no grounding almost agreed with the measured one. In near and far grounding, the calculated value almost agreed with the one measured.
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