PROCESS OF TEST OF ENAMEL FOR COATS CONTROLLING ELECTRIC FIELD Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: maximum permissible intensity E_perm of electric field in sample of tested lot of enamel is found experimentally. Then parameters G₀ and A are determined also experimentally of dependence of conductance of enamel on intensity presented in the form of exponential curve G=G₀exp (AE). After this maximum permissible intensity E_max in coat is determined with preset values of maximum voltage applied to insulator, of thickness, dielectric permittivity of insulator and length of coat by calculation of distribution of voltage in capacitive-ohmic model of insulator with coat in which ohmic element presenting coat has dependence of conductance on intensity in the form of exponential curve with parameters G₀ and A. This helps to make conclusion on usability of enamel if E_max is less than E_perm. EFFECT: improved reliability of work of enamel in coats. 1 tbl