US 12,188,992 B2
System and method for ground fault detection of static starter circuitry
Sreedhar Desabhatla, Garching (DE); Malepati Bhavani Sankar, Bengaluru (IN); John A. Leonard, Salem, VA (US); and Sudeep Pathak, Hyderabad (IN)
Assigned to GE Infrastructure Technology LLC, Greenville, SC (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Oct. 19, 2022, as Appl. No. 17/969,634.
Claims priority of application No. 202211036196 (IN), filed on Jun. 23, 2022.
Prior Publication US 2023/0417842 A1, Dec. 28, 2023
Int. Cl. G01R 31/52 (2020.01); H02P 1/04 (2006.01)
CPC G01R 31/52 (2020.01) [H02P 1/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ground fault detection system, comprising:
a linear filter configured to receive as input one or more signals from a static starter system during operations of the static starter system and to produce a linear filter output, wherein the linear filter comprises a recursive linear filter having poles and zeroes tuned to allow a selected frequency component from the input, the selected frequency component is between 2 to 5 times a load frequency, the input comprises a false neutral voltage (FNV) signal, and the linear filter comprises a biquad filter;
a rectifier configured to rectify the linear filter output and to produce a rectifier output;
a gain system configured to multiply the rectifier output by a factor to produce a gain output; and
a fault indicator system configured to indicate a ground fault based on the gain output, wherein the ground fault detection system is configured to command an action based on the ground fault.