A Concept Smart Switch for Single-Phase Transformer and Reactor Control

Abstract

<p><b>Introduced to electrical power networks at the turn of the century, the use of power electronic devices to control and regulate single-phase networks has trailed behind. A likely reason for this outcome is the relative cost of 'smart devices' in a system of low earned revenue.</b></p> <p><b>Now a feature of grid modernisation projects, interest in 'smart devices' as a means to extend the useful life of distribution assets, delay capital expenditure, lower operating costs and to improve the supply reliability, is growing. </b></p> <p><b>Described in this paper for the control of single-phase transformers and reactors is a concept 'smart switch' that uses a low voltage low power thyristor. Built with a novel magnetic core and winding arrangement, the disconnection and reconnection of a transformer or reactor is controlled by the semiconductor switch. The concept design is demonstrated in this paper for a thermal overload and switched shunt reactor transformer applications. </b></p>