Insulation detecting device for non-grounded power source

Details Insulation detecting device for non-grounded power source Insulation detecting device for non-grounded power source

2006-07-11

2006-07-11

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

For insulation fault of noncircuit elements

Reexamination Certificate

active

07075311

ABSTRACT:
An insulation detecting device having a capacitor and a DC power source, insulated from a ground potential part. A voltage detecting unit, detects a voltage across the capacitor. A first switching unit connects the capacitor to the DC power source in series for a first preset time shorter than a time taken for completely charging the capacitor. A second switching unit connects the capacitor between a positive terminal of the DC power source and the ground potential part in series for a second preset time. A third switching unit connects the capacitor between a negative terminal of the DC power source and the ground potential part in series for the second preset time. A fourth switching unit connects the voltage detecting unit to the capacitor after the first to third switching units are turned off. A computing unit estimates a voltage across the power source.

REFERENCES:
patent: 5818236 (1998-10-01), Sone et al.
patent: 8-226950 (1996-09-01), None

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