Sensored insulation plug (1, 2) for being inserted into a rear cavity of a medium voltage or high-voltage separable connector in a power distribution network of a national grid, and operable to insulate a connection element of the separable connector on an elevated voltage and to sense the elevated voltage, the sensored insulation plug comprising a) a plug body formed by a solidified insulating material and rotationally symmetric about a plug axis defining axial directions and radial directions orthogonal to the axial directions; b) an electrically conductive contact piece, mechanically and conductively connectable with the connection element on elevated voltage; c) an integrated sensing capacitor, operable as a high-voltage capacitor in a sensing voltage divider for sensing the elevated voltage, the sensing capacitor comprising i) a high-voltage electrode, wherein the high-voltage electrode comprises the coupling electrode and the contact piece; ii) a tubular sensing electrode, embedded in the insulating material and arranged around an axial section of the high-voltage electrode, iii) a dielectric comprising a portion of the insulating material arranged between the sensing electrode and the coupling capacitor, characterized in that it further comprises; d) a discrete coupling capacitor, operable to harvest energy from the elevated voltage of the contact piece and optionally operable to superimpose a communication voltage signal over the elevated voltage of the contact piece, wherein the coupling capacitor is embedded in the insulating material and comprises a coupling electrode, electrically connected to the contact piece, and an opposed harvesting electrode. a) a plug body formed by a solidified insulating material and rotationally symmetric about a plug axis defining axial directions and radial directions orthogonal to the axial directions; b) an electrically conductive contact piece, mechanically and conductively connectable with the connection element on elevated voltage; c) an integrated sensing capacitor, operable as a high-voltage capacitor in a sensing voltage divider for sensing the elevated voltage, the sensing capacitor comprising i) a high-voltage electrode, wherein the high-voltage electrode comprises the coupling electrode and the contact piece; ii) a tubular sensing electrode, embedded in the insulating material and arranged around an axial section of the high-voltage electrode, iii) a dielectric comprising a portion of the insulating material arranged between the sensing electrode and the coupling capacitor, characterized in that it further comprises; i) a high-voltage electrode, wherein the high-voltage electrode comprises the coupling electrode and the contact piece; ii) a tubular sensing electrode, embedded in the insulating material and arranged around an axial section of the high-voltage electrode, iii) a dielectric comprising a portion of the insulating material arranged between the sensing electrode and the coupling capacitor, characterized in that it further comprises; d) a discrete coupling capacitor, operable to harvest energy from the elevated voltage of the contact piece and optionally operable to superimpose a communication voltage signal over the elevated voltage of the contact piece, wherein the coupling capacitor is embedded in the insulating material and comprises a coupling electrode, electrically connected to the contact piece, and an opposed harvesting electrode.