US 11,817,247 B2
Automatic calibration system and method for passive low-power voltage transformer
Elisa Scala, Bologna (IT); Andrea Nalli, Rovigo (IT); and Simone Pezzolato, Jolanda di Savoia (IT)
Assigned to G & W ELECTRIC COMPANY, Bolingbrook, IL (US)
Filed by G & W ELECTRIC COMPANY, Bolingbrook, IL (US)
Filed on Jan. 21, 2022, as Appl. No. 17/581,484.
Prior Publication US 2023/0238165 A1, Jul. 27, 2023
Int. Cl. H01H 47/00 (2006.01); H01F 21/00 (2006.01); H01F 38/20 (2006.01); H01F 7/06 (2006.01)
CPC H01F 21/00 (2013.01) [H01F 7/064 (2013.01); H01F 38/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system for calibrating a low-power voltage transformer (LPVT), the system comprising:
a capacitive voltage divider; and
a variable capacitance device connected to the capacitive voltage divider;
wherein a parameter of the variable capacitance device is adjusted to minimize the ratio error of the LPVT,
wherein the capacitive voltage divider is a stand-alone capacitive voltage divider or is an embedded capacitive voltage divider.