The functions of the components of an oil-paper capacitive bushing are introduced by analyzing its structure

and the electric properties of insulation materials in the bushing are described.The causes and the harm of lacking oil in oil-paper capacitive bushing are discussed

and the judging methods are offered.The judging process of lacking oil in the bushing is illustrated by examples

and the rationality and accuracy of the judging method by comprehensively adopting capacitance C

tgδ

oil chromatogram analysis

and infrared test are demonstrated.