Overcurrent Relay Coordination and Adaptive Relay Setting of Distributed Network Using Multiple Standardized Tripping Relays and Improved Mathematical Formulation

The fundamental principles of overcurrent relay coordination are quick response and proper coordination between primary and backup relay pairs. Researchers have proposed many theories to achieve fast and reliable overcurrent relay coordination. To achieve the best results, researchers altered objective functions, or constraints, and used soft computing techniques. Furthermore, similar optimum results were obtained by employing multiple standardized tripping relays at various locations rather than the standard inverse curve. These numerous standardized relays may contain a mix of normal inverse relays, very inverse relays, and extremely inverse relays. This paper proposes a new placement of these multiple standardized tripping relays according to the suitability of these relays at a particular location. Further, the effectiveness of the proposed locations of these standardized tripping curves, a virtual model of the 10-bus distribution system of the Hatay Province, Turkey has been used. To avoid miscoordination between primary and backup relays, one reported objective function is used after the essential modifications. Furthermore, the adoptive settings of relay parameters, as well as the proposed location of standardized tripping curves, have been obtained. The results show that properly positioning these multiple standardized tripping relays prevents miscoordination between primary and backup relays and provides fast relay response with optimal relay parameter settings.