Why transformerless UPSs help to minimise carbon footprint

For data center operators, the economic, legislative and social impact of an large carbon footprint cannot be ignored, write our colleagues at Uninterruptible Power Supplies Ltd. Some important steps to reduce this footprint can be taken by choosing the best available UPS technology and deploying it correctly.

As UPSs are typically relatively large electrical systems, they can contribute significantly to overall energy reduction strategies.

An important point that the article picks up in this context: Today, UPS efficiency improvement comes primarily from using transformerless technology. However, efficiency can be increased further by operating in Eco mode.

Transformerless topology brings many advantages, the most important of which are improved efficiency and a higher, stable power factor.  Transformer-based UPSs present a lagging power-factor load to the incoming mains supply, which declines from unity as the UPS loading reduces. By comparison, transformerless UPSs inherently produce an input power factor which is much closer to unity and less load dependent. This draws lower input currents, minimises cabling and switchgear sizing, and sometimes reduces electricity running costs.

Under certain circumstances transformerless technology also offers further advantages and additional energy savings. The object of UPSs is to provide clean power with availability as high as possible – and a key way to improve availability is to use a redundant configuration that can tolerate the failure of a single module.

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