BUSHING INSULATOR AND BUSHING TYPE CURRENT TRANSFORMER FOR METAL ENCAPSULATED, AIR INSULATED MEDIUM VOLTAGE SWITCHGEARS.

摘要

The bushing insulator (DFS) and the bushing type current transformer (DSW) have a rectangular bushing hole (DFO) that is staggered outward forming a stair step pattern, to which a receiving part (AFT) is connected, said receiving part being disposed crosswise in relation to said hole and being preferably fitted with a round cross sectional structure having a conductor terminal (LTA) pointing outward to the top side. The conductor terminal is connected in an electrically conductive manner to a counter contact (GKT) by means of a primary conductor (PLT), whereby the bushing hole (DFO) and the receiving part (AFT) form part of a common cast resin body (GHK) and said cast resin body (GHK) has an external control electrode (SEA) molded into the cast resin surrounding the latter in a U shaped manner in the front area of the bushing hole (DFO). The cast resin body is provided with an inner control electrode (SEI) that is molded into the cast resin and shields the bushing hole (DFO) in the form of a plate in the boundary area between the bushing hole (DFO) and the receiving part (AFT).