Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1991-12-17
1994-02-15
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324510, 324544, G01R 3102
Patent
active
052870626
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.
REFERENCES:
patent: 2613345 (1952-10-01), Osterland
patent: 3189818 (1965-06-01), Frakes
patent: 4896115 (1990-01-01), LeMaitre et al.
Journal of Physics E. Scientific Instruments, vol. 10, No. 1, Jan. 1977, Ishing, Bristol GB pp. 71-72.
IEEE Transactions on Instrumentation and Measurement, vol. IM-26, No. 1, Mar. 1977, New York, pp. 46-52.
Allin Patrice
Pellegrin Christian
Weynachter Luc
Merlin Gerin
Tobin Christopher
Wieder Kenneth A.
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