Simulation and Experimental Validation of Temperature Rise in DC 40 kV RIP Insulated Tubular Busbars Under High Current Conditions

To evaluate the 9000 A/2 h short-time thermal capacity of a DC 40 kV RIP insulated tubular busbar, an equivalent electro-thermal coupling model was established, and its parameters were calibrated using 9000 A/2 h, 8000 A/3 h and 7000 A tests. The results show that the expanded uncertainty of temperature measurement is about +/-2.6 °C, and the deviations between simulation and test results are within this range. At 9000 A for 2 h, the conductor-side maximum temperature is about 83 °C and the maximum temperature rise is about 43 K, lower than the 50 K engineering reference limit, indicating compliance with the short-time temperature-rise criterion.