The invention relates to a method for monitoring capacitor bushings (2a, 2b, 2c) for an alternating-current grid, wherein the alternating-current grid has a first, second, and third phase (A, B, C) and comprises: a first grid line (5a), with which the first phase and a first capacitor bushing (2a) are associated and on which a first grid voltage is present, a second grid line (5b), with which thesecond phase and a second capacitor bushing (2b) are associated and on which a second grid voltage is present, a third grid line (5c), with which the third phase and a third capacitor bushing (2c) areassociated and on which a third grid voltage is present; each of said capacitor bushings comprises: a line (4), which is connected to the associated grid line, an electrically conductive covering (3), which surrounds said conductor; for each of said phases a corresponding characteristic value is determined for a characteristic variable characteristic of the capacitor bushing in question at a predefined initial time (t0); a corresponding standardized characteristic value is determined for the characteristic variable at a predefined later time (tn) after the initial time (t0) in accordance withthe characteristic value in question and/or in accordance with at least one of the other characteristic values; it is checked whether the standardized characteristic value has changed impermissibly.