7MERCK W F H, DAMSTRA G C, BOUWMEESTER C E, et al. Methods for Estimation of the Vacuum Status in Vacuum Circuit Breakers [J]. IEEE Trans. on Dielectrics and Electrical Insulation, 1999, 6(4): 400-404.
8WALCZAK K. Method for Vacuum State Evaluation Based on Analysis of Dynamics Changes of Electron Field Emission Current and X-radiation in Time[C]// International Symposium on Discharges and Electrical Insulation in Vacuum. TourS, France, 2002: 231-234.
9US Patent, NO. 3263162. JOHN R L. Apparatus and Method for Measuring the Pressure Inside a Vacuum Circuit Interrupter[S]. 1962.