Increasing complexity in data centres presents higher demands on UPS systems. Nonlinear and unbalanced loads must be catered for just as effectively as the peaks and overloads caused by high start up currents.
Critical applications must not only be protected against mains failures, but also against voltage peaks, troughs and transients.
UPS system design should form part of the building design and represents a significant investment with potentially high operating costs. Therefore, no compromise in the security and economy of the UPS should be considered.
The TBUPS 400 fulfills these requirements by utilising new IGBT technology.
Due to the use of IGBT power semiconductors for the rectifier and the inverter, the TBUPS 400 Operates virtually mains distortion free. (see fig. 2)
Due to power factor correction in the rectifier (pf > 0.99) only active power is consumed, eliminating the need for reactive power compensation units and resulting in no charge for reactive power by the utility company. Existing compensation units can naturally still be utilised. The cost of the TBUPS 400 can be recouped in a few years.
A power factor > 0.99 reduces the apparent power (kVA) compared with conventional UPS’s with the same power output by approx. 20 %, thereby reducing the cost of the input distribution.
Under partial load conditions as low as 25 %, the TBUPS 400 still offers outstanding power factor values of pf = 0.96. UPS systems with 12 pulse thyristor bridge rectifiers and active filters have difficulty achieving similar results.