HOW TO SELECTION AND SIZING UPS??(Chapter #1)
Prior to selecting the UPS, it is necessary to determine the need. UPS may be needed for a variety of purposes such as lighting, startup power, transportation, mechanical utility systems, heating, refrigeration, production, fire protection, space conditioning, data processing, communication, life support, or signal circuits.
Some facilities need an UPS for more than one purpose. It is important to determine the acceptable delay between loss of primary power and availability of UPS power, the length of time that emergency or backup power is required, and the criticality of the load that the UPS must bear. All of these factors play into the sizing of the UPS and the selection of the type of the UPS
SELECTION OF UPS 3 PHASE OR 1 PHASE
Single Phase power is used in most homes and small businesses and adequate for running lights, fans, 1 or 2 ACs, some computers and motors up to about 5 horsepower; a single phase motor draws significantly more current than the equivalent 3-Phase motor, making 3-Phase power a more efficient choice for industrial applications
3-Phase power is common in large businesses, data centers, as well as industry and manufacturing around the globe. While it is expensive to convert to three phase from an existing single Phase installation, 3-Phase allows for smaller, safer and less expensive wiring.
Most consumers of electricity in Thailand have a three phase mains connection if the total load is more than 5-7 KW. Only if expected load is below 5-7KW, then the consumer gets a single Phase connection. Even when the consumer has a three phase connection, the choice of three phase or single phase UPS depends on several factors like the loads to be connected to UPS and also electrical distribution within the facility from the building incomer, electrical switchgear and distribution units to the room the loads to be protected are within. This not only builds up a complete picture of the electrical circuits on-site. It also helps to determine whether to offer a three phase or single phase UPS system.
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