Investigation of high voltage electrical breakdown of pressurized glycol/water mixture with microsecond charging

By means of coaxial apparatus, a high electrical voltage breakdown experiment for pressurized glycol/water mixture with microsecond charging is carried out. The experimental results are presented and analyzed. The conclusions are shown as follows: the breakdown strength increases with the hydrostatic pressure to the one eighth power; the coefficient in Martin formula increases with increasing glycol concentration; the highest breakdown stress of 235.5 kV/cm observed in the glycol/water mixture of glycol concentration of 80% at a hydrostatic pressure of 12×105 Pa is 112.2% higher than that in pure water at constant pressure; it is accumulative for the pressurization and glycol addition for the capability to improve electrical breakdown strength of water dielectric, and the pressurization i