Patent ID: 6873159

Claim:
A method for monitoring a capacitor bushing to which an electrical operating voltage is applied and in which a voltage divider is formed with an electrically conducting insert, comprising: recording and storing at least one measured value of an electrical measured quantity by using a measuring tap, which is connected to the insert, and by using ground potential; changing the impedance between the measuring tap sand the ground potential after recording the at least one measured value; recording and storing at least one signal value of a measurement signal formed using the measuring tap and the ground potential; setting the temporal interval between the point in time of recording the one measured value and the point in time of recording the one signal value such that changes in the operating voltage between the two points in time are negligible, wherein based on the measured value and the signal value, quotient formation is used to ascertain a characteristic quantity, which is compared with a predetermined set value, and; if the characteristic quantity deviates from the predetermined set value, a status signal indicating a fault of the capacitor bushing is formed.