US 11,657,973 B2
Capacitor with insulation composition showing thermo-reversible oil-to-gel-transition
LeJun Qi, Beijing (CN); Saskia Scheel, Lenzburg (CH); Emmanuel Logakis, Baden-Dättwil (CH); Felix Bandalo, Ludvika (SE); Richard-changyu Zhang, Xi'an (CN); and Biswajit Singh, Västeras (SE)
Assigned to Hitachi Energy Switzerland AG, Baden (CH)
Appl. No. 16/982,278
Filed by Hitachi Energy Switzerland AG, Baden (CH)
PCT Filed Mar. 11, 2019, PCT No. PCT/EP2019/056038
§ 371(c)(1), (2) Date Sep. 18, 2020,
PCT Pub. No. WO2019/179811, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 201810224573.0 (CN), filed on Mar. 19, 2018.
Prior Publication US 2021/0043381 A1, Feb. 11, 2021
Int. Cl. H01G 4/224 (2006.01); C08L 91/00 (2006.01); H01G 4/32 (2006.01); H01G 2/12 (2006.01); H01G 2/10 (2006.01)
CPC H01G 4/224 (2013.01) [C08L 91/00 (2013.01); H01G 2/10 (2013.01); H01G 2/12 (2013.01); H01G 4/32 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A capacitor, comprising:
a container, comprising:
at least one wound package of a metal foil and a polymeric insulating film, or of a metallized polymeric film, and
an insulation composition,
wherein the insulation composition comprises:
a synthetic aromatic oil or a natural aromatic oil, and
a polymer in a concentration of about 0.1 wt % to about 10 wt %,
wherein the insulation composition is configured to undergo a thermo-reversible gelation below a gel-point temperature in the range from about 30° C. to about 90° C., the gel point being defined as the temperature at which the storage modulus G′ of the insulation composition is equal to the loss modulus G″ of the insulation composition.