Application of reclosers for reliable supply in rural overhead distribution networks

Reclosers are self controlled devices, which are designed for switching load and fault current under remote operation. This makes reclosers a unique device with interesting functionality and special requirements for their design. The paper describes design and feature of modern reclosers. It covers the vacuum switching technology of the circuit breaker itself, the integrated sensors, the comprehensive protection and load flow functions, monitoring capability, the smart control logic and various communication features. The combination of these new technologies allows a very efficient operation of distribution networks. A consequent application of reclosers, distribution switches and control units leads to increased reliability of supply and reduced operation costs. Even though three phase applications are the most common ones, many countries still utilise single phase systems for very low loaded lines. Reclosers can be used for three and single phase lines.