The maximum size overcurrent device for primary only protection of a three-phase 45 kVA transformer with a 480V primary and a 120/208V secondary is Oa.50A Ob.60A Oc. 70A Od.90A
Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
Consider the primary side is a delta winding.
Consider the formula to find primary current.
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