Static Transfer Switches – How fast do They Switch, In the event of a power loss?
Power Continuity installations switch seamlessly via STS to the UPS & Generator supplies without any break, to avoid any disruption or loss to your site; virtually instantaneous.
No Break Power Protection. True Power Continuity.
For true resilience, though, there needs to be at least TWO GRID supplies feeding your Data Centre as a bare minimum and preferably these A & B feeds are from two separate ring mains. This is where a Power Continuity Static Transfer Switch (STS) comes into play.
The STS automatically selects the best & most stable available power from either of the two or more available sources, and rapidly switches over; as and when required, simultaneously. Should the STS sense any aberration in the mains supply it will switch. Your supply may not even go onto UPS and yet the STS can sense micro distortions and switch; afterwards switch back to the preferred source. This can happen many times or hardly any. It’s automatic.
It depends on the model of STS you choose.
Power Continuity Static Switches usually respond within around 3 to 5 milliseconds (thousandths of a second) – in fact, so fast that your equipment will not even notice or be affected by the change of power source from Source A to B feed or vice versa.
How is this achieved?
By the use of silicon-controlled rectifiers (SCRs) which, having no reliance on moving parts, allowing the transfer to be made extremely super fast, in fact Power Continuity STS are the most reliable in the industry.
A common issue is that the servers and racks that are being powered by the Static Switches have not been maintained.
For example an internal UPS within the rack could be actually ‘dead’.
A rack mount ATS has never been tested, hence when called upon; it fails.
Worst still, no one in the Data Centre has reliably checked that each rack actually has two sources of power.
Therefore, guess work assumes that all racks are dual fed, hence when the static switches operate, some racks inevitably fall over as the two feeds are found to be from a single source.
If the priority source or either of the sources are out of limits, transfer will be effected only after it has remained stable and within limits for a preset switch; but NOTE: Synchronization, transfer will only take place when the phase difference between the two sources is established by the intelligence with each Static Switch.
Should your site develops issues that cause the Static Switch to have to ‘think’ longer before making the switch, then it will take many more milliseconds before the switch takes place and may even caused multiple switching, in rapid succession.
PowerContinuity engineers are experienced in installing Power Continuity Static Transfer Switches as part of our complete power protection package.
For more information of Static Switches- Call Power Continuity on 0845 0558455
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