Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-08-26
1982-10-26
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324158MG, 324 52, 361 31, G01R 3102
Patent
active
043564437
ABSTRACT:
A method is provided for detecting the existence of arcing faults in the phase windings of a polyphase electric machine and for simultaneously identifying the specific phase winding in which the arcing fault exists. Arcing faults in phase windings of electric machines cause high frequency currents to flow through all phase windings of the machine with a drastically higher magnitude in the phase winding in which the arcing fault exists. These currents can thus be measured to determine the existence of the arcing fault and selectively determine which phase is affected.
REFERENCES:
patent: 4053876 (1977-10-01), Taylor
patent: 4096539 (1978-06-01), Scaturro
patent: 4156846 (1979-05-01), Harrold et al.
Krawczewicz Stanley T.
Lanyi William D.
Westinghouse Electric Corp.
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