UPS uninterruptible power supply is a kind of constant voltage and constant frequency power supply containing energy storage device with inverter as the main component. It is mainly used for computers, computer network systems or other power electronics to provide uninterrupted power supply. When the utility input is normal, the UPS will be the utility voltage regulator to supply the load, the UPS is an AC utility voltage regulator, it also charges the battery; when the utility power interruption (accidental power failure), the UPS will immediately battery power, through the inverter conversion method to continue to supply the load 220V AC power, so that the load to maintain normal work and protect the load software and hardware from damage. UPS equipment usually provides protection against both excessive voltage and too low voltage.
The main parameters of UPS power supply
1、Input parameters.
Input voltage range, according to the quality of China's power grid is not high, you should choose a wider range of UPS power supply, currently designed with silicon controlled UPS range of -15%, +10%, designed with IGBT rectifier range of -25%, +23%; frequency range is best to choose a wider range of 50Hz ± 5Hz; AC bypass voltage range to choose ± 10%, such as more than this value will increase UPS failure rate; UPS should have a three-phase input phase sequence error and three-phase out-of-phase input automatic protection function.
2, output parameters.
Output voltage static stability, medium and large UPS for ± 1%; output voltage transient voltage fluctuation value, medium and large UPS less than ± 5%; adjustable range of output voltage, medium and large UPS from the rated value of the minimum adjustable ± 5%; output frequency, medium and large UPS for 50Hz ± 0.1%; output overload capacity, medium and large UPS in more than 10 minutes to meet 125% load, in more than 1 minute to meet 150% load; with a three-phase 100% unbalanced load capacity, the three-phase voltage difference should not exceed ± 3%; output voltage harmonic distortion degree
3、Rated operating parameters.
Rated output power; rated maximum output, input current; rated output input frequency, China are the standard 50Hz; nominal input, output voltage, according to the way into and out of the line to determine, mainly single-in single-out, three-in single-out, three-in three-out mode, large and medium-sized UPS using three-in three-out in and out of the line.
4, other parameters.
Average trouble-free time of 200,000 to 400,000 hours (large UPS power supply), 150,000 to 220,000 hours (medium-sized UPS power supply); parallel capability, the UPS is required to have direct parallel output capability, the UPS output current of the average current imbalance of 2% to 5%, the smaller the value should be better; should have remote monitoring, fault alarm, operating conditions record function; should have anti-surge suppression against lightning strikes. Anti-static discharge function.
UPS uninterruptible power supply basic parameters.
1、Load
The load can be divided into three categories, 10 kVA for small loads, 10 to 60 kVA for medium loads, 60 kVA or more for large loads.
2, the harmonic content of the output voltage (distortion)
harmonic voltage to the reference voltage in the circuit and the logic circuit working at low voltage will cause noise.
3、Step load
When a part of the load is turned on or off, it will cause a step change in the load. As the UPS can not instantaneously correct this sudden change in current, the output voltage will produce a corresponding change. Small loads, which are connected to very few devices, sometimes have a 100% step load. Medium loads appear to step no more than 50%. And large loads may only show a step load of more than z5% under abnormal operating conditions. General inverter design can meet less than 25% of the step load.
4、Non-linear load
Refers to inductive load or capacitive load. In the computer system, the nonlinear load is mainly the host computer, printer (especially laser printer) and display terminal, etc.; the linear load is mainly the disk and tape equipment. Generally small loads are nonlinear loads; medium loads are linear and nonlinear loads are similar or one of them is slightly larger; and large loads are generally linear loads, because large loads are composed of multiple devices, which rise and fall in operation, and the total load seems to be more stable in macroscopic terms;.
5、Efficiency
For a large system, the efficiency must be high enough. For example, a 125kV-A UPS, if only 85% efficiency, then the annual consumption of additional costs equivalent to 30% of the initial investment.
6、Volume
small and medium-sized UPS requires the smallest possible size.
7、Noise
The noise level of the UPS uninterruptible power supply should not exceed the noise level required by the environment in which it is located.
UPS power supply development is based on high quality, high reliability of customer demand to solve the typical power supply problems faced in modern small and medium-sized data rooms as the purpose. At the same time, it takes into account the requirements of adapting to the increasingly sensitive investment return rate, energy consumption costs, remote intelligent management and efficiency. what are the parameters of the ups power supply? I believe that at this moment there is no doubt about this issue. In short, these parameters are the content that we need to pay extra attention to when choosing the ups power supply.
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