In the measurement of tanδ test of capacitive voltage divider

such phenomena as tanδ of high voltage and medium voltage capacitors is sometimes in the normal range but total capacitance tanδ is obviously smaller or even negative. In view of this abnormal situation

the function relation of ground insulation resistance of medium terminal of capacitive divider to the tanδ measurement is analyzed and determined byway of establishing ground model of medium terminal of capacitive divider. The simulation test is per-formed on the actual capacitive divider to verify and analyze its correctness

which can provide referencefor the abnormal tanδ of such capacitive divider.