Apparatus for detecting insulation defects in devices connected

Details Apparatus for detecting insulation defects in devices connected Apparatus for detecting insulation defects in devices connected

1997-06-09

1999-10-26

Brown, Glenn W.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324509, 324522, 324536, G01R 3102

Patent

active

059735007

ABSTRACT:
An apparatus for detecting an insulation defect in at least one device connected into an electrical power transmission or distribution network and having: leakage current measuring sensors (10) arranged on a ground line (19a, 19b, 19c) of the device; a measurement signal analogue/digital converter (58, 60); and a signal processing unit (14) including a comparison circuit (75) for comparing the measurement signal with a maximum threshold value representative of the maximum value of the leakage current permitted to flow in the ground line (19a, 19b, 19c), to obtain an insulation defect signal. The processing unit (14) includes a discriminator circuit (76) for discriminating, in the insulation defect signal, between a component of a useful signal and a component of a disturbance signal.

REFERENCES:
patent: 4529929 (1985-07-01), Berggren
patent: 5446682 (1995-08-01), Janke et al.
patent: 5477150 (1995-12-01), Ham, Jr. et al.
patent: 5789928 (1998-08-01), Baker

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