The paper explains various factors and steps to consider when developing an ATS, including (i) the location of the scheme and appropriate transfer initiate conditions, (ii) loads connected directly to the buses in the ATS and criticality of the loads, (iii) various functions. The paper explains various factors and steps to consider when developing an ATS, including (i) the location of the scheme and appropriate transfer initiate conditions, (ii) loads connected directly to the buses in the ATS and criticality of the loads, (iii) various functions. Protection Relays selection, integration, and best practices for Automatic Transfer Switch (ATS) Panel assemblies compliant with IEC 61439. Protection relays in an Automatic Transfer Switch (ATS) panel are the intelligence layer that supervises source availability, system health, and transfer. Abstract—An automatic transfer scheme (ATS) is a widely used power system protection and control scheme to automatically transfer loads from one source to another during contingencies. Most modern ATS controllers and logic processors are also programmed with additional protection and operational. Eaton's power frame type automatic transfer switches (ATS) offer the highest amperage capacity in the industry. Designed for applications where total system coordination must be accomplished, they offer integral overcurrent protection with an electronic trip unit for a variety of standby power. For Mission Critical Applications ASCO protects medium voltage loads by offering maintainable and highly proven power transfer switches. The switches can be configured with protective relays and other options to meet specific project requirements. UL 1008, Transfer Switch Equipment, is the product standard for ATSs. When designing a power system and specifying an ATS, two important design considerations must be evaluated: An ATS's.
