Line constants and transient simulation of wiring on L-type duct

Line constants calculation and simulation methods of wirings on an L-type duct are proposed in this paper. The single-phase wire is modeled by a distributed parameter line model with a characteristic impedance obtained by the proposed equation. The characteristic impedance of the line on an L-type duct is unaffected by the distance between the wire and the wall of the duct if the wire is installed at a distance of more than twice its height from the wall. Simulated result obtained by the proposed model agrees with a measured result and a calculated result by Finite Difference Time Domain (FDTD) method, which gives theoretically accurate result. The calculation time of the proposed method is far smaller than that of the other methods. A proposed multi phase simulation model of a wiring on an L-type duct enables a practical estimation of its transient characteristic.