METHOD FOR ESTIMATION OF ELECTRIC-EROSIVE DURABILITY OF MATERIALS FOR ELECTRIC CONTACT CLAMPS Russian patent published in 2005 - IPC

FIELD: reliability of technical systems.

SUBSTANCE: method includes setting values of acceleration coefficient, performing testing of samples in forced mode, in which for forcing tests through contact during one commutation electric charge let through is of larger value, than value of electric charge in formal mode, results are recorded, processed in forced mode for normal mode conditions, test results are processed, on basis of processing results resource of material is estimated. Censoring moments are set in normal T_n and forced T_f modes, approximate value of acceleration coefficient k = T_n/Transformer is set, two selections of samples from batch are formed, samples are tested from first batch in normal mode until breakdown or until censoring moment T_n, result t_n, is recorded, then switching moments T_sf of forced mode to normal mode and tests end T_fn are received in stepped mode, samples from second batch are tested in stepped mode, including forced test mode until breakdown or moment T_fn, results at each step t_sf and t_fn are recorded, results are processed in stepped mode for normal mode conditions. Probabilities of reliable operation in normal P_n(t) and stepped P_s(t) modes are calculated, value of acceleration coefficient k_y is estimated precisely, after that remaining samples from batch are tested in forced mode until breakdown or censoring moment T_f, t_f is recorded, result is calculated for normal mode conditions, probability of reliable operation P(t) is calculated, parameters of Weibull allocation t₀ and coefficient are determined, then resource m of subject material is estimated, calculated as mathematical expectation of operation until breakdown in accordance to formula m = t₀*G(1+1/s), where G(1+1/s) - gamma-function.

EFFECT: shorter time needed for testing resource of materials.

3 cl