Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-07-02
1981-02-03
Moore, David K.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 51, G01R 3110
Patent
active
042491266
ABSTRACT:
Current sensing coils are fixed to the grounded sheath of a gas-insulated conductor in pairs which preferably straddle the internal location of a support insulator. A plurality of such sensors may be disposed along the length of the conductor. The output of the pick-up coils is applied to a conventional electromagnetic target which can be operated from a target-off position to a target-on position in response to the axial flow of ground current through the housing in opposite directions from an insulator position as measured by any pair of pick-up elements. By then comparing the condition of the various targets on the system, one can determine the point at which fault current flowed from the main insulated conductor, across a faulted insulator and to the grounded housing. A local source of reset power may be provided to permit reset of the target, or an external magnetic pulsing device may be employed.
REFERENCES:
patent: 3869665 (1975-03-01), Kenmouchi et al.
patent: 4063171 (1977-12-01), Schweitzer, Jr.
Gould Inc.
Moore David K.
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