US 12,449,466 B2
Method and system for distributed ground detection
Eric M. Waydick, Saint Francis, WI (US); and Timothy Carlson, Fox Point, WI (US)
Assigned to DRS Naval Power Systems, Inc., Menomonee Falls, WI (US)
Filed by DRS Naval Power Systems, Inc., Milwaukee, WI (US)
Filed on Apr. 11, 2023, as Appl. No. 18/298,981.
Claims priority of provisional application 63/331,553, filed on Apr. 15, 2022.
Prior Publication US 2023/0333154 A1, Oct. 19, 2023
Int. Cl. G01R 31/08 (2020.01); G01R 31/52 (2020.01); H02H 3/16 (2006.01)
CPC G01R 31/086 (2013.01) [G01R 31/52 (2020.01); H02H 3/16 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for detecting a location of a grounded condition in an ungrounded electrical system, the method comprising:
measuring, using a ground detection circuit comprising at least a first overload protection device, a second overload protection device, and a third overload protection device, a difference from a tie point of the ungrounded electrical system and a ground point to determine if a grounded condition exists;
if the grounded condition exists, for each phase of electric current in the ungrounded electrical system:
measuring a first signal using a first detection circuit of the first overload protection device;
measuring a second signal using a second detection circuit of the second overload protection device; and
measuring a third signal using a third detection circuit of the third overload protection device;
receiving, by a processor of a controller, the first signal, the second signal, and the third signal;
comparing, by the processor, at least one of the first signal, the second signal, and the third signal to a stored threshold value;
determining, by the processor, a location of the grounded condition based at least in part on the comparing the at least one of the first signal, the second signal, and the third signal to the stored threshold value; and
displaying, by the processor, the location of the grounded condition on a display, wherein the location of the grounded condition is displayed within a digital representation associated with the ungrounded electrical system.