Measurement transformer having active parts which are embedded in a cast-resin body

摘要

The cast-resin body (1) of the measurement transformer surrounds an attachment (2) which is cast thereon and on which secondary terminals (3) are arranged which can be connected to a metallic base plate (4) by means of earthing bolts (6). In order to prevent the cast-resin body (1) being damaged in the region of the attachment (2) as a result of stresses from current surges, underneath through-holes (5) in the secondary terminals there are threaded holes (10) for the earthing bolts (6) in order to connect the respective secondary terminals to a flexible contact plate (13). The contact plate (13) is firmly clamped between the cast-resin body (1) and the base plate (4), in the region outside the attachment (2). This results in a flexible earth connection. This measurement transformer can be used primarily for encapsulated current transformers. IMAGE