Method and apparatus for checking insulation of ungrounded power

Details Method and apparatus for checking insulation of ungrounded power Method and apparatus for checking insulation of ungrounded power

1997-07-14

1998-10-06

Regan, Maura K.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

324510, 324772, G08B 2100, G01R 2726

Patent

active

058182365

ABSTRACT:
An apparatus includes an insulated first switching element and a capacitor which are connected in series between one of positive and negative main circuit wirings connected to an ungrounded power source and a ground potential section (vehicle body); a second switching element with one terminal thereof connected to a junction point of the first switching element and the capacitor; switching element control device for selectively closing the first switching element for a predetermined time so as to charge the capacitor and for closing the second switching element so as to discharge the capacitor while the first switching element is opened; device for detecting the electric charge accumulated in the capacitor; and device for determining the insulation between the other of main circuit wirings and the ground potential section in accordance with the detected amount of charge.

REFERENCES:
patent: 3287635 (1966-11-01), Moole
patent: 3287636 (1966-11-01), Gagniere
patent: 3569826 (1971-03-01), Burnett
patent: 3895264 (1975-07-01), Kirilloff
patent: 3975663 (1976-08-01), Moorey
patent: 3978465 (1976-08-01), Goode
patent: 4562390 (1985-12-01), Tobise
patent: 5382946 (1995-01-01), Gale
patent: 5446682 (1995-08-01), Janke et al.
patent: 5514964 (1996-05-01), Benesh et al.

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