Automatic ground fault protection for an electric power system

H - Electricity – 02 – H

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H02H 3/16 (2006.01) B60L 3/04 (2006.01) B61C 17/00 (2006.01) H02H 7/00 (2006.01) H02H 9/02 (2006.01) H02P 9/04 (2006.01)

Patent

CA 1266117

20LC 1496 AUTOMATIC GROUND FAULT PROTECTION FOR AN ELECTRIC POWER SYSTEM ABSTRACT OF THE DISCLOSURE An electric power systems includes means responsive to a variable control signal for varying the output of a source of electric power, and means for detecting the magnitude of ground leakage current in the system. Protective means is provided for modifying the value of the control signal when ground current is abnormally high so that: (1) the power output of the source is reduced to a fraction of its normally desired amount if the ground current magnitude is in a middle range between a predetermined deration threshold level and a predetermined maximum permissible limit, (2) the power output is restricted to zero for at least a minimum interval of time if the ground current magnitude increases above its maximum limit, and (3) the zero-power restriction is automatically removed at the end of the minimum interval unless (a) ground current did not decrease below a predetermined reset level within a predetermined span of time after the zero-power restriction was initiated or (b) power has been so restricted "n" different times within an immediately preceding period of "T" seconds.

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