Method for determining minimum number of samples required for obtaining dielectric breakdown strength and electronic device and computer-readable storage medium implementing said method

A method for determining a minimum number of samples required for obtaining a dielectric breakdown strength, comprising:

• S1:
• conducting a plurality of breakdown experiments on a dielectric to obtain experimental breakdown field strength data;
• S2:
• constructing Weibull sub-distributions for respective breakdown causes corresponding to the experimental breakdown field strength data, and superimposing all of the Weibull sub-distributions to obtain a Weibull mixed distribution;
• S3:
• dividing the experimental breakdown field strength data into breakdown field strength data of each of the Weibull sub-distributions by using the Weibull mixed distribution to calculate a reliability measure R and a reliability estimate {circumflex over (R)} corresponding to each of the Weibull sub-distributions;
• S4:
• characterizing a current key quantity UR of each of the Weibull sub-distributions as
• U
• R
• =
• n
• [
• ln
• ⁢
• (
• ln
• ⁢
• R
• ln
• ⁢
• R
• ˆ
• )
• ]
• by using a set current experimental sample size n, the reliability measure R and the reliability estimate {circumflex over (R)} corresponding to each of the Weibull sub-distributions;
• S5:
• calculating a relative deviation corresponding to a confidence interval of the current key quantity UR corresponding to each of the Weibull sub-distributions under a preset confidence level, selecting the Weibull sub-distribution with a relative deviation less than a deviation threshold from all of the Weibull sub-distributions to serve as a target sub-distribution;
• S6:
• if the relative deviation of the current key quantity UR corresponding to the target sub-distribution is greater than a reference value, then increasing n and return to step S4, if the relative deviation of the current key quantity UR corresponding to the target sub-distribution is less than the reference value, then proceeding to step S7;
• S7:
• using the current experimental sample size as the minimum number of the samples required for obtaining the dielectric breakdown strength.