Asked by: Harland Sares
asked in category: General Last Updated: 22nd March, 2020

How do static transfer switches work?

Static transfer switch (STS)
A static transfer switch uses power semiconductors such as Silicon-controlled rectifiers (SCRs) to transfer a load between two sources. Because there are no mechanical moving parts, the transfer can be completed rapidly, perhaps within a quarter-cycle of the power frequency.

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Similarly, it is asked, what does a static transfer switch do?

STS – Static Transfer Switch are automatic static switching equipments designed to transfer electric loads between two independent AC power sources without interruption. The static transfer switch (STS) is an electrical device that allows instantaneous transfer of power sources to the load.

Also Know, how do automatic transfer switches work? The completely automatic transfer switch monitors incoming voltage from the utility line, around the clock. When utility power is interrupted, the automatic transfer switch immediately senses the problem and signals the generator to start. The transfer switch continues to monitor the utility line conditions.

Similarly, how does a static switch work in a UPS?

While the UPS is on line, using either mains or battery power, the static switch is in 'On UPS' state, connecting the inverter output to the load. When supplies return to normal, the static switch automatically transfers the load back to bypass while the battery recharges and the inverter reverts to standby mode.

What is the difference between a static switch and an automatic transfer switch?

A Static Transfer Switch (STS) utilizes a static electronic component (SCR), which permits a transfer in less than four milliseconds (1/4 of an electrical cycle). On the other hand, an Automatic Transfer Switch (ATS) relies on moving parts, and makes a significantly slower transfer than Static Transfer Switches.

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