Three aspects of UPS power supply design considerations
UPS power supply needs to consider the following three aspects when designing:
Usability
The increasing availability requirements of data processing centers. Drive the continuous development of UPS configuration. "Availability" is the percentage of time that the power supply remains powered and functioning to support critical loads. As with any other model, in order to simplify the analysis process, some assumptions must be made on the model. Therefore, the usability value in this paper is higher than the usability in the actual application.
2. Grade
All UPS systems (and power distribution equipment) require regular maintenance. The availability of system coverage depends, on the one hand, on the level of configuration that is not subject to equipment failure*, and on the other hand, the ability to perform normal maintenance and routine testing to ensure critical load power. This topic is further discussed in a document by the research institute UpTImeInsTItute entitled "IndustryStandardTIerClassificaTIonsDefineSiteInfrastructurePerformance". The hierarchical concepts described in the UptimeInstitute documentation cover the five UPS architectures mentioned in this article.
3. Cost
The higher the availability level of the configuration, the higher the cost. This cost refers to the cost of building a new data sweep. Therefore, it includes not only the cost of the UPS structure, but also the cost of the entire network Key Physical Tomb Infrastructure (NCPI) for data sweeping. The latter includes commissioning costs for generators, switchgear, refrigeration systems, fire protection systems, raised floors, racks, lighting, physical spaces and the entire system. These are just upfront costs and do not include operating costs, such as maintenance costs. In calculating the above costs, we assume that each cabinet has an average footprint of 2.79 m2 and a power density range of 23 kW to 3.8 kW per cabinet. If the cost-sharing equipment is increased, the cost per rack will also decrease.
Historically, when planning critical load power supplies, future developments must be fully considered so that the UPS system can provide 10 or 15 years of support for the load. It turns out that planning according to this principle is very difficult. In the 1990s, the concept of “watt/square area†was proposed to facilitate the discussion framework and compare various facilities. However, due to the inability to reach a consensus on the meaning of "square area", this power supply design indicator has caused many misunderstandings. Recently, along with the general trend of technology, people have gradually adopted the concept of "Watt Yin cabinet" to indicate system capacity.
It turns out that this type of pot method is more accurate because it is easy to count in the number of racks in the unit space. Regardless of how the load is chosen, it's important to choose a configuration from the start to keep the design in the right direction.
Today, a number of scalable modular UPS system designs have emerged that allow UPS power capacity to grow as IT needs grow.
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