Breakdown strength of glycerin in helical transmission line under hundred-nanosecond pulse

In this paper, a transmission line with five spiral-wires in parallel was designed. The transit time and the characteristic impedance of the transmission line are 200 ns and 14 omega, respectively. Its slow wave coefficient is close to 13. The insulating medium of the transmission line is glycerin. In order to investigate the breakdown strength of glycerin under a hundred-nanosecond pulse, simulations and experiments are conducted. The results indicate that the breakdown strength of glycerin under hundred nanoseconds reached 653 kV/cm, which is a 400 kV/cm increase compared with that under a microsecond pulse. However, under hundred nanoseconds, the breakdown strength of glycerin in transmission is unaffected by pressure within 1 MPa, and pressure is conducive to the insulation recovery of glycerin. (c) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).