Understand the roles of different transfer devices and plan their place in the overall system.
Define Roles and Transfer Levels
STS and ATS devices differ in how they operate and where they fit in a system. Define the protection objective, transfer-time requirement and source relationships for each level before selecting equipment.
In a multi-level transfer system, verify action sequences, protection coordination and recovery logic to prevent unwanted interactions. Confirm the final design against load tolerance and site test results.
