A conventional substation transformer is generally installed as part of a larger substation arrangement, while a compact transformer solution integrates equipment into a more space-efficient configuration. The appropriate design depends on voltage, capacity, protection requirements, available space, and site conditions.

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Transformer selection depends on factors such as kVA or MVA rating, primary and secondary voltage, frequency, impedance, phase configuration, cooling method, insulation system, environmental conditions, load profile, and future capacity requirements.