SUBSCRIBE To Our Mail List To Get This Article In PDF
In last years industrial uninterruptible power supply is becoming very important part of infrastructures and industries where they can't afford lack of power. So it's accustomed to help protect from power electricity lost in places for example data centers, telecommunication facilities, places with computer servers, hospitals, factories, supermarket, airports, basically it can be found anywhere. Industrial uninterruptible power supply is generally utilized in conjunction with diesel generators. Where ups can be used in first minutes of power failure. Which is simply enough time for heavy duty diesel generators to begin. After diesel is fully running it requires over the load. Generator is usually configured with delay when switching back loads to ups, just in case you will find shorter interruptions.
Power ranges of Industrial uninterruptible power supply are from very small 300 - 800 VA (used mostly for private computers) as much as high-powered industrial Uninterruptible power supply which may be up to 1000kVA.
Of course it always possible to place more devices into parallel, thus which makes them even stronger. They upper dimensions are limited by technology, mostly by peak current through thyristors. Thyristors and capacitors represent also the costliest part (besides batteries) of ups.
Online double conversion uninterruptible power supply would be the most used ups devices. It has pure sine wave that is actually better sine wave then delivered through power distribution. Because of this in case of power outage the transfer of load is without interruption from normal mode to battery mode. The power efficiency can be between 92 to 97% and of course smaller if compared to offline or line interactive ups, but when working with expensive and sensitive loads its absolutely essential to protect them not just from power outage but additionally from al kind of noises and spike that may come through mains power supply distribution.
Offline ups are kind of cheaper variant, it cheap to made, and when in normal mode it uses almost no power, that's why it have very high power efficiency (or own consumption). But it doesn't protect ups from noises or smaller changes in main voltages. Also the transfer time from normal mode to batter mode would be to big for sensitive electronic components. Line interactive ups on contrary is something between online and offline ups. because it has transformer its resilient to alterations in output voltage, but still it doesn't full protect loads like online uninterruptible power supply does.
Typical autonomy battery time is usually from 8-15 minutes, however in any ups over 1 kVA that may be usually increases by adding more batteries, modules or even more battery cabinets. Generally batteries are 12 V or 6 V. So 3 or 6 cell batteries, where each cell is 2 V. Battery capacity is from 5 Ah to over 100 Ah. Batteries used should be deep cycle batteries. Normal batteries last from three to 5 years, while longevity batteries could last up to Ten years. Will depend on environment which should be too hot. It should between 15 to 22 degrees Celsius.
Uninterruptible power supply might have 1 phase or 3 phase input, same goes for output. Larger ups devices usually have communication card, so its possible to monitor device over lan or over internet. It's also possible to configure remote shutdowns. So for example if ups can be used in data center its likely to configure loads - computers to shut down when time on battery reaches some critical value.
Typical components of industrial uninterruptible power supply are rectifier, inverter, batteries and wall charger. Rectifier transform ac mains to dc power, inverter convert this dc power back to ac power, although it can also convert dc battery power to ac power. Of course for converting low voltage battery power there's a part called booster that boost voltage to raised value that is more desirable for transforming from dc to ac. Important parts are also electronic bypass and manual bypass. When there are overload ups will switch to electronic bypass because of its protection. Loads will not be disturbed in this instance. Manual bypass can be used for maintenance purposes in last case obviously loads aren't protected anymore.
In cases where there is needed ultra stability more industrial uninterruptible power supply can be used into parallel for bigger security or just to increase overall power.
The most known industrial uninterruptible power supply brands are Apc, Socomec, Eaton, Cyber power, Liebert and GE Digital energy
The most known industrial uninterruptible power supply brands are Apc, Socomec, Eaton, Cyber power, Liebert and GE Digital energy
Click To View The Document In PDF
SUBSCRIBE To Our Mail List To Get This Article In PDF
