US Patent 9291651 Feedthrough insulator

A feedthrough insulator is characterized by the fact to comprises: >-a central rod (10) which extends longitudinally with respect its longitudinal axis (10y); >-a sleeve (20) positioned coaxial around said rod of connection (10) with the respective circular shell (21) radially spaced (D-21) with respect to the central rod (10); >-a sensor (30) of electric field and/or of magnetic field, positioned in proximity of the inner surface (22) of said shell (21) of the sieeve (20); and >-a carrying body (40) formed by dielectric material able to contain and to embed said central rod (10), said sieeve (20) and said sensor (30) of electrical field and/or of magnetic field.