New Three-Phase Static Transfer Switch using AC SSCB

These days, widespread use of sensitive loads and distributed generators makes static transfer switch (STS) an essential component in power circuits to achieve a good power quality for AC Grids. In case that fault occurs, previous STS cannot break the fault current. However, the proposed STS can break quickly even if a short-circuit fault occurs. Also if there is power quality problems such as Sag/Swell, the proposed STS quickly transfers the load to the good quality source. It is anticipated that the proposed STS may be utilized to realize many reliable AC grid systems.