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Courtesy : EEP
This article suggests designs for withstanding the abnormal thermal and mechanical aspects in power transformers.
Figure 1 – Generator transformer
Power transformers connected directly to generators can experience excitation and short-circuit conditions beyond the requirements defined by ANSI/IEEE standards. Special design considerations may be necessary to ensure that a power transformer is capable of withstanding the abnormal thermal and mechanical aspects that such conditions can create.
- Unit transformers (UT) that are connected directly to the system
- Station service transformers (SST) that connect the system directly to the generator auxiliary load
- Unit auxiliary transformers (UAT) that connect the gene-rator directly to the generator auxiliary load
Full article at EEP.