US 12,437,924 B2
Dielectric material for a high voltage capacitor
Gunther A.J. Stollwerck, Krefeld (DE); and Dipankar Ghosh, Oakdale, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 18/246,527
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Aug. 31, 2021, PCT No. PCT/IB2021/057957
§ 371(c)(1), (2) Date Mar. 24, 2023,
PCT Pub. No. WO2022/069967, PCT Pub. Date Apr. 7, 2022.
Claims priority of provisional application 63/086,336, filed on Oct. 1, 2020.
Prior Publication US 2023/0395326 A1, Dec. 7, 2023
Int. Cl. H01G 4/12 (2006.01); G01R 15/06 (2006.01); H01G 4/10 (2006.01); H01G 4/20 (2006.01)
CPC H01G 4/1245 (2013.01) [G01R 15/06 (2013.01); H01G 4/10 (2013.01); H01G 4/206 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A high voltage capacitor for a voltage divider that is configured to sense an elevated voltage for medium and high voltage electrical distribution networks, the high voltage capacitor comprising:
a high voltage electrode;
a measurement electrode; and
a dielectric material consisting essentially of:
a lanthanum oxide-zirconium oxide-titanium oxide glass filler, and
an insulating polymer matrix,
wherein the lanthanum oxide-zirconium oxide-titanium oxide glass filler is disposed in the insulating polymer matrix such that the dielectric material is characterized by a capacitance that does not vary by more than +/−0.5% in the temperature range of −20° C. to 60° C.,
wherein the insulating polymer matrix is present in an amount of about 40 vol. % to about 70 vol. %, and the lanthanum oxide-zirconium oxide-titanium oxide glass filler is present in an amount of about 30 vol. % to about 60 vol. % within the dielectric material,
wherein the dielectric material is disposed between the high voltage electrode and the measurement electrode.