Research on Temperature Characteristic of Coaxial Cable Under the Condition of Repetitious Pulse High Current

Pulsed power supply connects energy-dissipation devices by coaxial cable. The temperature of coaxial cable used for repetitious discharge of pulsed power supply can rise highly. This paper focuses on the transient temperature characteristic of coaxial cable under the condition of repetitious pulse high current. In consideration of time and resource consuming of the general 3-D simulation software, 1-D thermal network differential equations (TNDEs) are introduced. In addition, the Arnoldi process is applied to reduce TNDEs' complexity due to dense space discretization. For model validation and verification, a statistical design of experiments over the parameters of discharge period and current level is organized. The trends of transient temperature around the coaxial cable surface and outer conductor during discharging and cooling process are measured. The experimental results have a good agreement with calculation results. The comparison results show that the theoretical analysis is suitable for analyzing the coaxial cable temperature with different running conditions.