Industrial uninterruptible power supply overview

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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 used to protect from power electricity lost in places such as 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 diesel generator to begin. After diesel is fully running it takes within the load. Generator is usually configured with delay when switching back loads to ups, in case there are shorter interruptions.

Power ranges of commercial uninterruptible power supply come from really small 300 – 800 VA (used mostly for private computers) as much as high-powered industrial Uninterruptible power supply which can be up to 1000kVA. Obviously it always possible to place more devices into parallel, thus which makes them even stronger. They upper size is limited by technology, mostly by peak current through thyristors. Thyristors and capacitors represent also the most expensive 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. Beocouse of this in the event 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 when compared with offline or line interactive ups, however when dealing with expensive and sensitive loads its absolutely essential to protect them not just from power outage but also 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 high power efficiency (or own consumption). However it doesn’t protect ups from noises or smaller alterations in main voltages. Also the transfer time from normal mode to batter mode is to big for sensitive electronic components. Line interactive ups on contrary is one thing in between online and offline ups. since it has transformer its resilient to changes in output voltage, but nonetheless it doesn’t full protect loads like online uninterruptible power supply does.

Typical autonomy battery time is generally from 8-15 minutes, however in any ups over 1 kVA that may be usually increases with the addition of 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 must be deep cycle batteries. Normal batteries last from three to 5 years, while long life batteries could last as much as 10 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 applies to output. Larger ups devices will often have communication card, so its likely to watch device over lan or higher internet. It’s also possible to configure remote shutdowns. So for example if ups can be used in data center its possible 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 battery charger. Rectifier transform ac mains to dc power, inverter convert this dc power 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 higher value which is more suitable for transforming from dc to ac. Important parts will also be electronic bypass and manual bypass. When there are overload ups will switch to electronic bypass because of its protection. Loads wont be disturbed in this instance. Manual bypass can be used for maintainance purposes in last case obviously loads aren’t protected anymore. Where there’s needed ultra stability more industrial uninterruptible power supply can be used into parallel for bigger security or simply to improve overall power.

The most known industrial uninterruptible power supply brands are Apc, Socomec, Eaton, Cyber power, Liebert and GE Digital energy

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Industrial uninterruptible power supply
Industrial uninterruptible power supply overview

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