Patent ID: 8912807

Claim:
A sensor device for use in detecting current in a conductor, said sensor device comprising: a Rogowski coil defining an aperture; and a dielectric material at least partially enclosing said Rogowski coil, said dielectric material comprising a first part and a second part and having a dielectric constant of at least about 3.5 at about 10 to 1000 Hertz (Hz), said dielectric material configured such that, when a conductor is at least partially inserted within said aperture, at least said first part of said dielectric material is positioned between said Rogowski coil and the conductor, wherein said first part of said dielectric material has a first thickness, said second part of said dielectric material has a second thickness that is less than the first thickness, and said second part of said dielectric material is positioned adjacent to said Rogowski coil and is opposite said aperture, wherein the first thickness is measured radially and normal to the conductor.