Formulas for the inductance of coaxial busses comprised of square tubular conductors

BY virtue of its axial symmetric geometry, the coaxial tubular bus possesses certain very desirable electrical and mechanical characteristics. Low inductance contributes to good voltage regulation. Reduced skin and proximity effects minimize line losses and average temperature rise under load. Axial-symmetric distribution of skin and proximity effects reduces current density distortion and attendant hot-spot concentrations, hence enables a greater current rating for a specified maximum copper temperature. As electromagnetic forces between conductors are eliminated largely, mechanical bracing against short-circuit forces correspondingly can be reduced. The nested conductors require less space for installation and a smaller supporting structure than they would if arranged side by side.