Difference Between Single Phase UPS and Three Phase UPS

Published: 02nd December 2011
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A Single Phase uninterruptible power supply is located between the main power outlet and the device that is being protected and protect against AC mains power fluctuations and problems such as surges, power spikes, sags and brownouts. A Three Phase UPS provides protection and protects against the same problems associated with Single Phase systems except that Three Phase systems are of higher voltage, in the order of 400 Volts. The substation provides Three Phase power over 3 windings over which the power is 120 degrees out of phase with each other. A normal household would only be fed from single winding thus providing Single Phase, whereas a factory or engineering plant may be supplied with the full Three Phase power.

Whoever came up with the idea of UPS batteries did a great service to computer users. Among its many uses, it helps one to shut down his or her computer correctly. This might not seem like a big issue, but considering the negative effects abrupt shut downs have on the registry, one should never overlook it. In addition to safe shutdowns, the UPS helps protect the computer from power surges. This is actually one of the reasons the user must get the best device in the market.

When buying one, there are various aspects which must be considered in order to get the best brand. These include the size, the manufacturer, the operation time offered once disconnected from the grid among other specifications. Each of these will hold a different level of importance to the user. However, all of them are important.

If you are purchasing the unit for the first time, you might not know which problems the unit must address. This is why you must know the most common effects of power problems to decide on the best device to purchase. In most cases, people experience power surges, brownouts and blackouts which result in video snow, audio static, slow electronic degradation, or total damage of the equipment.

UPS Systems are normally categorised as Online, Line-Interactive or Standby:

Online - An Online Double-Conversion UPS is designed to protect sensitive equipment that could be damaged or caused to malfunction due to excessive power fluctuations. The output voltage and frequency are maintained within strict limits regardless of the input.

Line-Interactive - This category of UPS is able to maintain output voltage by automatically adding or subtracting coils through use of an autotransformer and different tap points. At the same time it is able to conserve valuable battery power.

Standby - A standby UPS, sometimes referred to as an offline system only provides basic protection for the device(s) it protects. It does provide surge protection and battery backup when the input voltage drops below a level which is predetermined. It will not easily protect against extended periods of power loss and certainly not from anything but the briefest of brownouts.

Some manufacturers even have a range of UPS Systems that meet the unique, stringent regulatory requirements for use with some of the equipment and patient support systems unique to hospitals and medical facilities. A UPS System with power ratings from 200vA to 16KvA in a range of styles such as Desktop, Tower or Rackmount are normally available from most manufacturers, with some systems having the capability to have additional battery packs for extended runtime.

Whatever your UPS, requirement, make sure that you evaluate your power consumption requirements thoroughly before purchasing a system, otherwise you may find that the system chosen might not give full protection to all devices for the period expected.

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