Can I design 90kW UPS system using 4x20kW + 1x10kW = 90kW Modules in ST120 Frame ?
No, it is not possible to use a 20kW module and a 10 kW module in the same frame. UPS inserted in the same frame do work in parallel. Parallel modules have to be of the same power rating. The same applies to traditional standalone UPS connected in parallel.
Moreover, it is not possible to design a 90 kW UPS system using 4x20kW + 1x10 kW. The alternative would be 5x20kW in an ST120 Frame. It’s always good to have some spare power.
Even better would be to have redundancy between modules. In this specific case, with a load of 90kW, an ST120 Frame with 6x20kW modules (the additional 20kW is the module which creates the redundancy, N+1 = 5x20kW + 20kW) would be the preferred solution with more availability.
Carlo Kufahl is the Product Manager for 3-phase modular UPS at the center of excellence for UPS, Power Protection Product Group of ABB, Quartino, Switzerland. He joined in 2010 and as a Sales Engineer for two years and then he took over as Product Manager. Today he coordinates and manages the complete life cycle of the 3-phase modular UPS which includes pre-development, development, launch, sales and phase out of products. Carlo holds a Bachelor’s degree in Electrical Engineering from the University of Applied Sciences and Arts of Southern Switzerland. Carlo also holds a Master in Business Administration obtained at Zürich University of Applied Sciences.
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