METHODS AND APPARATUSES FOR DETERMINING THE DISTRIBUTION OF ELECTRIC CHARGE IN ELECTRICAL INSULATORS PRODUCED BY A SUDDEN DEFORMATION IN THE INSULATORS

摘要

Investigation apparatus for investigating the distribution of electric charge (2) within an insulator (1) comprises: a function generator (7) suitable for generating a time-varying electrical voltage v, an amplifier (8) suitable for amplifying the voltage from the function generator, the voltage V amplified in this way being applied to the terminals of electrodes (3,4) on either side of the insulator, apparatus (9) suitable for creating sudden deformations that propagate within the insulator, a delay circuit (10) synchronized with the function generator and suitable for triggering the apparatus for creating deformations at a recurrence frequency fr lying in the range 500 Hz to 50000 Hz, means (11) for successively recording sequences S of signals appearing at the terminals of the electrodes on each occasion that one of the recurrent deformations passes through the insulator and means (12) for processing the sequences S of signals recorded in this way so as to cause the desired electrical distribution within the insulator to appear.