Application of End Screen Injection Signal Method in Transformer Winding Deformation Test

Because the high voltage side of transformer outgoing line doesn't need capacitive bushing, it is directly connected to the combination of GIS and high side is closed in GIS equipment, if sudden short circuit faults occur in the operation of the transformer, the need to judge transformer winding deformation tests internal deformation degree, the traditional frequency response method won't work. This paper presents a new method to replace the injection signal at the head of the transformer bushing with the injection signal at the end of the screen. Through the comparison and analysis of the test atlas for the signal injection method at the head and the signal injection method at the end, the atlas obtained are similar by the two methods, but the amplitude is slightly different. Through the analysis of the principle for the two methods and the field test data, the end screen injection signal method can be used to test the transformer winding deformation.