These sites often employ the use of multiple generators. The figure to the right demonstrates an example. The installation configuration of the generators does not allow parallel operation even if the generator control panel has paralleling software installed.
The sequence of automatic transfer switch events is basically the same as the single generator configuration. When utility power is lost to the site, each individual building's ATS performs its duties and emergency power is brought online until power is restored.
With this style of installation, it is possible that one building on the site loses utility power and the remaining has power.
Only the generator for the building with failed utility power would initiate. This may be acceptable for non-critical devices, but it has a risk factor. While both online and line-interactive types of UPS provide full protection from major power problems, such as surges, spikes, sags, blackouts and brownouts, they differ in a few significant areas.
Simply put, an on-line UPS offers a higher level of protection than a line interactive at a higher cost.
More specific areas where the two types differ include sine wave output, voltage regulation, and double-conversion inversion. The definition of ATS automatic transfer switch ATS ATSE, for Automatic transfer Switching equipment is the English abbreviation, Chinese national standard called the automatic transfer switching equipment, commonly known as the double power automatic switch.
ATS automatically converts the GB standard definition of switch is: by one or several switch electrical appliance and other essential electric appliances, for the detection of power supply circuit, when a path failure of the power source overvoltage, undervoltage and lack of equal , the realization of switch apparatus of normal power supply and reserve power supply automatic conversion The definition of STS static transfer switch STS is Static Transfer Switch is the English abbreviation, called the law standard and popular are static transfer switch.
STS static transfer switch for power supply two choose a automatic switching system, under the normal working state of the main power in the voltage in the normal range, the load has been connected to the main power supply. If that primary source disappears, the STS very quickly switches to the alternate source.
One of the best ways to guarantee a higher level of availability is utilizing Static Transfer Switches STS in your data center. This allows for the single-cord loads to be powered at all times— even when main bus is shut down for maintenance or fails.
Both busses can still be powered by the UPS powering bus B. If the utility fails, the generator gets a signal to start and once it is running, the ATS switches to the generator and feeds power from the generator. Once utility is restored, the ATS will switch back to utility.
This is not to be confused with the implementation of a STS, which is designed for uninterrupted power. The question often comes up about having the two busses in sync at the STS so as to avoid an out-of-phase transfer that can damage downstream equipment.
Optimized transfer allows for a completely out of phase transfer without ill effect.
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