IEEE PC57.12.38/D2.0, Apr 2013

PC57.12.38/D2.0, Apr 2013 is a technical standard for phase distribution transformers rated for high voltage up to 34 500 GrdY/19 920 V and low voltage at 480/240 V, with capacities of 250 kVA and smaller. It is relevant to power, energy, and industrial applications where transformer design, ratings, and performance must be matched to distribution needs. This document helps define a consistent basis for specification, testing, and procurement of smaller distribution transformers.

PC57.12.38/D2.0, Apr 2013 overview

This standard focuses on phase distribution transformers used in electrical distribution systems with the stated voltage and kVA limits. PC57.12.38/D2.0, Apr 2013 is intended to support clear technical requirements for equipment intended to step voltage between higher distribution levels and 480/240 V utilization levels. In practice, it helps align design expectations around ratings, insulation coordination, and performance characteristics so that transformers can be selected and evaluated against a common engineering reference.

Typical use cases

This standard is commonly used when specifying single-phase or phase distribution transformers for utility or industrial distribution networks that serve lower-voltage loads. It may apply to transformers installed in feeder systems, local service equipment, or site distribution points where 34 500 GrdY/19 920 V and below must be converted to 480/240 V. PC57.12.38/D2.0, Apr 2013 is especially useful for equipment selection in facilities that depend on consistent voltage transformation and dependable power delivery.

Why this standard matters

For manufacturers, engineers, and purchasers, the standard supports more reliable comparison of transformer products by defining a specific technical scope. PC57.12.38/D2.0, Apr 2013 can reduce ambiguity during design review, testing, and procurement by anchoring expectations to a known voltage and capacity range. That matters for safety, consistency, and performance because transformer requirements must match the intended distribution application without over- or under-specifying the equipment.

• Phase distribution transformer requirements
• High-voltage scope up to 34 500 GrdY/19 920 V
• Low-voltage applications at 480/240 V
• Equipment rating limit of 250 kVA and smaller
• Useful for specification and procurement review