US Patent Issued to HITACHI ENERGY on Dec. 30 for "Method for detecting earth faults and frequency converter system with earth fault detection" (Swiss Inventors)

ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,606, issued on Dec. 30, was assigned to HITACHI ENERGY LTD (Zurich).

"Method for detecting earth faults and frequency converter system with earth fault detection" was invented by Dan Wu (Dietikon, Switzerland), Beat Buchmann (Baden, Switzerland) and Christian Schlegel (Uitikon, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of detecting earth faults, at a frequency converter connected between a first grid operating at a first frequency and a second grid operating at a different, second frequency, comprises determining a common mode voltage at the side of the converter connected to the second grid, determining levels of component...