Power transformer dry type bushing embarking combined low power instrument transformers. Impact of the mutual influence on the accurancy

The authors have developed the concept of an “All-in-One Transformer” that incorporates into its design a new dry type 100 kV digital bushing design with integrated LPIT current and voltage measurement functions. The new digital bushing uses a unique dry type capacitance graded resin-impregnated fiberglass insulation structure with three sets of capacitive screens as a primary winding including a voltage divider used for voltage measurement and Rogowski coil placed at the ground potential portion of the bushing for current measurement.