Electronic ground detector for armature supplies

Details Electronic ground detector for armature supplies Electronic ground detector for armature supplies

G - Physics

01

R

324/17

G01R 31/08 (2006.01) G01R 27/18 (2006.01) G01R 31/34 (2006.01) H02H 3/16 (2006.01) H02H 7/08 (2006.01)

Patent

CA 1116236

CASE-2576 ELECTRONIC GROUND DETECTOR FOR ARMATURE SUPPLIES ABSTRACT OF THE DISCLOSURE This invention relates to a ground fault detector for a d.c. machine having a convertor power source. The detector includes a resistance circuit device that detects unbalanced currents corresponding to an asymmetrical ground fault in the machine. An undesired common mode voltage from the convertor is also present. A ground sensor connected to a mid-point of the resistance circuit filters out the harmonic voltage so that the ground sensor produces at its output a fault signal whose magnitude represents the ground fault current. The detector also includes a terminal sensor for sensing the convertor output voltage and for providing a terminal output signal proportional thereto. An attenuator attenuates this output signal by a predetermined amount which results in a threshold signal. Both the fault signal and threshold signal vary as the convertor output voltage varies. However, a trip signal is generated when the magnitude of the fault signal exceeds the magnitude of the threshold signal. The trip signal is independent of variations in convertor output voltage. Previous ground fault detectors have been desensitized by harmonic voltages from the convertor which resulted in false ground fault readings. The present detector filters out the harmonic voltages and is independent of variations in convertor output voltage.

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