Reference voltage measuring bridge for a device for monitoring and measuring the insulation of a DC voltage electrical mains system
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United States of America Patent
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-
Feb 15, 1994
Grant Date -
N/A
app pub date -
Dec 17, 1991
filing date -
Dec 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reference AC signal having a frequency of about 4-10 Hz is injected into a line of a DC electrical network for performing insulation measuring in a processing unit. The AC signal is measured in a mixed bridge having a first resistive dividing bridge connected in parallel with a second capacitive dividing bridge between the line and the ground. The intermediate output points of the first and second bridges are joined together and connected in an input of the processing unit. The impedance and the dividing ratio of the two bridges cause the DC voltage measured at said input to be low in relation to the value of the AC voltage measured at the output of said mixed bridge.
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