Abstract
The solid state transfer switch (SSTS) is designed to replace the mechanical autotransfer equipment currently in use to switch major industrial and commercial facilities from one feeder to another-a process that typically takes 0.3 to several seconds. A SSTS can also provide large customers with a cost-effective alternative to an in-house uninterruptible power supply system. This paper presents a new SSTS concept based on bi-directional control thyristor (BCT) technology for the mitigation of voltage deviations (sags or swells), interruptions and other power supply system faults. A utility application of the solid state transfer switch is described and its performance discussed.
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