As for the dielectric loss factor and capacitance measurement of installed and operated oil-immersed inverted current transformer

the data measured by the common forward wiring mode can only reflect the insulation performance of straight section of capacitive bushing and the insulation at the head is not checked. However

the result measured by the common reverse wiring mode is the comprehensive data and is easily affected by the coupling capacitance of the its connected equipment. Regarding this issue

the dielectric loss factor and capacitance measurement decomposition method of the oil-immersed-inverted current transformer is proposed in this paper. In this method the way of inverse wiring in combination with the screen is adopted to measure the dielectric loss and capacitance at the head insulation of the oil-immersed-inverted current transformer and on the straight section of the capacitive bushing. It has reference for both dielectric defect and location of oil-immersed-inverted current transformer. Finally

the practical application of the method is described through examples.