Special transformers
ABB has developed a transformer that can operate safely with fast-acting breakers to provide reliable commissioning and load-bank switching operations.
byWritten by Esa VIRTANEN, Joel KERN, Pablo PACHECO, Ruggero BORDON
ABB’s transformers for special applications meet special needs
Designed to be flexible, compact, and adaptable, ABB’s specialized transformers are available in a broad range of voltage levels and power ratings; units for subsea or mobile substations and data centers operate with reduced losses.
For complex applications or harsh conditions standard transformer products might not be feasible. Drawing on 100 years of experience and a global footprint, ABB has developed special application transformers with this in mind. High quality materials for core and winding, improved components and perfected connection technologies allow ABB to develop transformers to suit the end user; the result is reduced power losses and extended product lifetime. In this way, ABB meets customers’ technological demands while reducing investment time.
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Data centers
Data center technology is dynamic and continually expanding – ABB ensures safe, reliable, and efficient operation of these invaluable information fortresses, Figure 1. Building on its background in supplying mission critical power and automation technologies, ABB has developed a transformer that can operate safely with fast-acting breakers to provide reliable commissioning and load-bank switching operations.
Switching of fast-acting breakers, such as vacuum and SF6 breakers, can produce fast transient overvoltages inside transformer windings; some of which lead to failures, with subsequent downtime and irreparable equipment; both of which are incredibly costly to network managers. ABB’s Transient Voltage ResistantTM Transformer (TVRTTM) provides complete peace of mind during network switching operations, Figure 2. The TVRT functions in any electrical network because it is the only solution that controls transient voltages. All its components are oil-free, which greatly reduces installation costs and removes the risk of fires or spills; this is the safest solution for people, property and the environment.
The development of the TVRT by ABB engineers led to the knowledge that switching transients are generated inside of the windings, unlike lightening voltage transients. Furthermore, overvoltages caused by high frequency re-ignitions are the source of the major voltage stress, not amplification of voltage due to resonance inside the transformer, as was previously thought.
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