The invention relates to a high-voltage device (1), in particular a measuring transducer, with an encapsulating housing (2) and with at least one active component (3), which is arranged in the encapsulating housing (2). The at least one active component (3) is coated with at least one polymer (4). A method according to the invention for increasing the dielectric strength in a high-voltage device (1) involves at least one active component (3), which is arranged in an encapsulating housing (2), in particular filled with clean air (6), being coated with at least one polymer (4), in particular by shrink-fitting a shrink tube and/or by immersion-bath coating and/or by spray coating, wherein the polymer (4) is applied in particular as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyolefin and/or an ethylenetetrafluoroethylene copolymer (ETFE).