ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,469,653, issued on Nov. 11, was assigned to Hitachi Energy Ltd (Zurich, Switzerland).
"Pressure pulse diagnostics of an OLTC" was invented by Cecilia Forssen (Vasteras, Sweden), Nilanga Abeywickrama (Vasteras, Sweden), Bengt-Olof Anders Stenestam (Ludvika, Sweden) and Joachim Schiessling (Enkoping, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure relates to a method for monitoring a vacuum on-load tap changer including determining a total main vacuum interrupter opening time as a time elapsed between a first point in time and a second point in time, a total resistor vacuum interrupter opening time as a time elapsed between the third ...