US 12,283,399 B2
Insulating gas composition
Lujia Chen, Manchester (GB); Ian Cotton, Manchester (GB); Alexander C Smith, Holmfirth (GB); and Jameel B Khan, Manchester (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Jun. 17, 2022, as Appl. No. 17/843,173.
Claims priority of application No. 2110043 (GB), filed on Jul. 13, 2021.
Prior Publication US 2023/0012807 A1, Jan. 19, 2023
Int. Cl. H01B 3/02 (2006.01); B64D 27/02 (2006.01); B64D 27/24 (2006.01); H01B 3/56 (2006.01)
CPC H01B 3/02 (2013.01) [B64D 27/24 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A high voltage electrical system suitable for an aircraft comprising:
an enclosure containing an electrically insulating gas composition comprising:
C3F7CN, in an amount between 22% and 70% by volume;
one or more inert gas selected from the list consisting of nitrogen, carbon dioxide (CO2), air and argon;
an electrical device insulated by the electrically insulating gas composition; and
a pressurisation system configured to maintain the electrically insulating gas composition in the enclosure at an absolute pressure of between 50 kPa and 200 kPa.