How to choose the room UPS power capacity size? - - - - - -

by:KEBO      2020-05-14
UPS power output capacity must reach or exceed the load needs to ensure the normal power supply. In the practical application to consider centralized power supply and distributed power supply UPS power source is adopted. Adopt the centralized power supply should be the total load will rooms all power accumulated by the UPS power supply load. Use of distributed power supply based on each UPS with different load. Load capacity of electrical equipment usually referred to as apparent power, expressed in S, VA. Apparent power contains active power P ( Unit W) And reactive power Q ( Unit Var) The relationship between the size, is S2 = P2 + Q2. Here we will be the ratio of active power and apparent power is called power factor, pure resistance load power factor is 1, the power factor of the capacitive load is in commonly 0. 6 ~ 0. 7. Because there are all kinds of switch power supply computer room equipment class of the nonlinear loads and all kinds of printers load, the load impact current is big, if the power supply UPS capacity is too small, overloading operation for a long time, it's easy to have a waveform distortion, and easy to cause the output level at the end of the power device, over current, plus the calorific value caused by overloading, adverse to the system reliability is obvious. For high-power UPS, general advice capacity utilization rate control in 0. 6 ~ 0. 8. Different types of load to the different proportion of the active power and reactive power, but the UPS power supply to the load at the same time provide enough active power and reactive power, the actual output capacity is limited by load type. For computer class load, UPS basically can output rated power, if the load impedance or inductive, is a drop in output power UPS, need to increase the UPS capacity. Of course room UPS power capacity also shoulds not be too big. Although UPS with small load is beneficial to the reliability, but excessive light load operation, a waste of investment, second in line for a long time of power failure, the battery has been small current discharge, easy to cause damage occur deep discharge. Computer room UPS working temperature should be controlled in the range of 0 ~ 40 ℃. If the temperature is too high, ventilated condition is bad, is not conducive to heat dissipation, derating use. Elevation also has an effect, at an altitude of more than 1000 m 1000 m per rise, after UPS shall use 5% derating.
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