Types, Function and Requirements for Current-Carrying Connections

A current-carrying connection has both an electrical and a mechanical function. Electrically, a current-carrying contact must be established between the conductors. Mechanically, the conductors should either be firmly connected (e.g., compression connection) or movably joined (e.g., sliding connection). When connecting the conductors, a reproducible and low contact resistance should be achieved, which does not increase unacceptably during the operating time [1, 2]. This ensures the galvanic coupling between the conductors via electrical contacts and a current can be carried permanently. In medium and high voltage technology, the design of the connection must also be such that no unacceptable partial discharges occur. The required lifetime of current-carrying connections in electrical energy technology is usually several decades. Stable contact and long-term behavior are therefore prerequisites for safe and reliable operation of all components and systems.