Abstract
The UPS and the static transfer switch (STS) are the alpha and omega of the power system in mission critical sites. The STS is the last line of power quality defense and removes all power problems that occur in the site between the UPS and the STS. The STS contain only three major components, excluding the sheet metal; these are: protective and isolating circuit breakers or molded case switches; logic, especially Triple Modular Redundant to ensure the safety of the loads; and two sets of silicon‐controlled rectifiers configured as single or three‐phase switches. Fault‐tolerant and abnormal operation must be specified and tested on the purchased STS. There are many iterations of transformer configurations and different tradeoffs made when choosing between stand alone, primary systems, and secondary systems. This chapter outlines some of these tradeoffs are and provides a list of tests that should be performed on a sample or production STS.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
