Ground fault detector

Details Ground fault detector Ground fault detector

G - Physics

01

R

324/58.4

G01R 31/08 (2006.01) G01R 27/18 (2006.01) G01R 31/02 (2006.01)

Patent

CA 1053757

GROUND FAULT DETECTOR Abstract of the Disclosure Techniques are disclosed for detecting and responding to a ground fault on either side of a two wire filtered, or unfiltered, power supply. A first voltage divider is bridged across the lines of the power supply and an intermediate point is grounded. A second voltage divider is bridged across the lines and two intermediate junctions provided. First and second voltage responsive means are coupled from ground to the first and second junctions of said second voltage divider, re- spectively, for comparing the potentials between the coupled points and providing an alarm in response to a variation in- dicative of a ground fault on either line below a predetermined threshold impedance. Filtering may be used to reduce the sensi- tivity of the system to noise or extraneous signals on the line. The sensitivity of the entire system and/or either line to ground may be adjusted by changing the relative values of the elements of the voltage dividers. The elements of the voltage dividers may be compared with the arms of a variation of the Wheatstone bridge.

249460

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