The Influence of the Dimensions of a Power Bus Bar with a Spiral Cross-Section on its Inductance and Capacitance

The paper analyzes the influence of the dimensions of a power bus bar with a spiral cross-section (the inner radius, the thickness of conducting sheets, the insulator thickness, and the number of turns) on its inductance and capacitance. It is shown that the thickness of the insulator (the distance between the conductive sheets) and the inner radius have the most significant impact on the per-unit length parameters. The prototypes of the power busbars with spiral and rectangular cross-sections were created and measured. The calculated and measured values of their capacitances were compared. According to the results of quasi-static simulations, the power bus bar with the spiral cross-section allows reducing the inductance value and increasing the capacitance value up to 1.8 times compared to the bar with the rectangular cross-section. According to experimental results, this difference is up to 1.75 times.