Cross-field ground fault sensor

Details Cross-field ground fault sensor Cross-field ground fault sensor

G - Physics

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324/58.4

G01R 31/08 (2006.01) G01R 27/18 (2006.01) H01F 29/14 (2006.01) H01F 38/20 (2006.01) H02H 3/33 (2006.01) H01H 83/14 (2006.01)

Patent

CA 1049097

ABSTRACT OF THE DISCLOSURE A differential transformer having a core of low perme- ability ferromagnetic material, a pair of identical primary windings and a secondary winding of relatively few turns capable of producing a large voltage output for a small magnitude ground fault current. A cross-field winding is utilized to periodically saturate a portion of the flux path in the transformer core to produce sudden changes in magnetic flux, which flux changes vary in magnitude proportional to the amount of fault current. During the time interval when the cross- field portion of the sensor is not saturated by a pulse of sampling current, a second pulse of current is introduced into the sensor secondary winding for detecting a grounded neutral wire by sensing the output voltage produced in response thereto.

264069

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