In this video, we show you exactly how to install busbars on a transformer body, step by step, making the process simple and easy to understand. Connect wire from S2 (l) to the Meter Current Input (-) or l. Always ground one side of the CT secondary (typically S2). Three. The SCT current transformers allow reliable power sensor technology to be implemented directly in the field as an integral part of the PC-based control system. Users can choose between two concepts, which are highly scalable thanks to various designs and performance classes and are thus suitable. ns and illus-trations without notice. In order to minimise measurement errors, the closest possible ra nance, which can be ailable with several types. Where connections are made to a wound primary, these should be insulated correctly as they carry the full system voltage and current. Work with caution and apply common sense, there may be risks other than those detailed above, for instance large CTs can be heavy, high ratio CTs may get. A busbar inside a transformer must do more than carry current; it must maintain low impedance, control heat rise, withstand short-circuit forces, support proper insulation clearances, and remain mechanically stable over decades of service.