A capacitive voltage sensor comprising: a source electrode (110, 210, 310, 410) having an elongated shape that extends longitudinally along a longitudinal axis, the source electrode (110, 210, 310, 410) including a first axial end portion (111, 211, 311,411) and a second axial end portion (112, 212, 312, 412) opposite to the first axial end portion (111, 211, 311, 411); a tubular body (120, 220, 320, 420) having an elongated shape which extends longitudinally along the longitudinal axis, the tubular body (120, 220, 320, 420) surrounding the source electrode (110, 210, 310, 410) and including a first axial portion (121, 221, 321, 421) and a second axial portion (122, 222, 322, 422) opposite to said first axial portion (121, 221, 321, 421), the tubular body (120, 220, 320, 420) comprising: a support structure (123, 223, 323, 423) made of insulating material; a first layer (124, 224, 324, 424) of conductive material disposed on an outer surface of support structure (123, 223, 323, 423), the first layer (124, 224, 324, 424) of conductive material configured as an electrical screen; a second layer (125, 225, 325, 425) of conductive material applied on an inner surface of the support structure (123, 223, 323, 423), wherein the second layer (125, 225, 325, 425) of conductive material is configured to form an element for a capacitive coupling; and a mass of dielectric insulating material (140, 240, 340, 440) encompassing the source electrode (110, 210, 310, 410) and the tubular body (120, 220, 320, 420). a source electrode (110, 210, 310, 410) having an elongated shape that extends longitudinally along a longitudinal axis, the source electrode (110, 210, 310, 410) including a first axial end portion (111, 211, 311,411) and a second axial end portion (112, 212, 312, 412) opposite to the first axial end portion (111, 211, 311, 411); a tubular body (120, 220, 320, 420) having an elongated shape which extends longitudinally along the longitudinal axis, the tubular body (120, 220, 320, 420) surrounding the source electrode (110, 210, 310, 410) and including a first axial portion (121, 221, 321, 421) and a second axial portion (122, 222, 322, 422) opposite to said first axial portion (121, 221, 321, 421), the tubular body (120, 220, 320, 420) comprising: a support structure (123, 223, 323, 423) made of insulating material; a first layer (124, 224, 324, 424) of conductive material disposed on an outer surface of support structure (123, 223, 323, 423), the first layer (124, 224, 324, 424) of conductive material configured as an electrical screen; a second layer (125, 225, 325, 425) of conductive material applied on an inner surface of the support structure (123, 223, 323, 423), wherein the second layer (125, 225, 325, 425) of conductive material is configured to form an element for a capacitive coupling; and a support structure (123, 223, 323, 423) made of insulating material; a first layer (124, 224, 324, 424) of conductive material disposed on an outer surface of support structure (123, 223, 323, 423), the first layer (124, 224, 324, 424) of conductive material configured as an electrical screen; a second layer (125, 225, 325, 425) of conductive material applied on an inner surface of the support structure (123, 223, 323, 423), wherein the second layer (125, 225, 325, 425) of conductive material is configured to form an element for a capacitive coupling; and a mass of dielectric insulating material (140, 240, 340, 440) encompassing the source electrode (110, 210, 310, 410) and the tubular body (120, 220, 320, 420).