Method for solving solid-insulator electrical aging life

Abstract

The invention discloses a method for solving the solid-insulator electrical aging life. The method includes the steps of S1, assuming that the solid-insulator electrical aging life obeys the inverse power rules (1) and (2) (please see the specification); S2, carrying out a solid-insulator acceleration electrical aging test with a step-by-step boosting method, wherein as for different voltages Uk and voltage keeping times Tk, the value of the following equation (3) (please see the specification) keeps unchanged; when the material accelerated life test is carried out with the step-by-step boosting method, the Tks in the equation (3) are the same and are assumed to be T0s, and the equation (3) becomes the equation (4) (please the specification); when the test is carried out, the multiple different T0s are selected for testing, and testing of multiple samples is carried out under each T0; multiple sets of known T0s, multiple sets of known Tms, multiple sets of Uks and multiple sets of Ums are obtained after the test is completed; S3, processing the test data with the maximum likelihood method; S4, calculating the insulation life L of a solid insulator under E according to the equation (1) or the equation (2). The method is simple, convenient and rapid, and the physical sense and the mathematical sense are visual.

Description

technical field [0001] The invention relates to a method for solving the electrical aging life of solid insulation. Background technique [0002] Most of the data measured during the electrical aging life test of solid insulation are discrete data. Previous studies have proved that the electrical aging life of solid insulation obeys the inverse power law, namely: [0003] L=AE -N (1); [0004] In the formula, E is the electric field strength or voltage applied to the insulation; L is the insulation life under E; N is a constant, called the electric field strength (voltage) withstand index of the insulating material; A is a constant; N, A value Depends on the material properties and the specific distribution of the electric field (voltage) in the material. [0005] can be obtained from the above formula [0006] E. N L=A(2); [0007] That is to say, the value of A is equal to the product of the Nth power of the electric field strength (voltage) applied to the i...

AI Technical Summary

Problems solved by technology

[0018] For the unknown constants N and A in formula (4), it is very troublesome to directly use the traditional maximum likelihood method to process data, and the physical and mathematical meaning of the method is not intuitive enough

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