Methods and apparatuses for determining the distribution of elec

Details Methods and apparatuses for determining the distribution of elec Methods and apparatuses for determining the distribution of elec

1992-04-28

1993-09-21

Snow, Walter E.

Electricity: measuring and testing

For insulation fault of noncircuit elements

73780, G01N 2700

Patent

active

052472604

ABSTRACT:
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 f.sub.r 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.

REFERENCES:
IEEE Transactions on Nuclear Science, vo. NS-29, No. 6, Dec. 1982, New York US, pp. 1644-1649, Sessler et al.
Revue Generale De L'Electricite, No. 3, Mar. 1988, Paris, France, pp. 37-43, Alquie et Lewinder: "La Mesure Des Champs Electriques . . . ".

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