Sensored insulation plug 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 . <EOS>