PC57.12.24/D4, Apr 2009 is a technical standard for phase transformers rated 3750 kVA and smaller, covering high-voltage systems up to 34 500 GrdY/19 920 volts and low-voltage systems up to 600 volts. It addresses requirements that help define acceptable design and performance for power and energy applications. For utilities, industrial facilities, and equipment buyers, this standard helps support consistent transformer selection, testing, and specification for smaller distribution and power conversion installations.

About PC57.12.24/D4, Apr 2009

This standard focuses on the technical requirements for phase transformers within the stated rating and voltage limits. PC57.12.24/D4, Apr 2009 is intended to guide engineering expectations around construction, performance, and related compliance considerations for these transformers. As an inactive document, it remains relevant as a reference point for legacy equipment, procurement review, and comparison against later requirements. Its scope is especially important where transformer characteristics must align with power system design and operating limits.

Where is PC57.12.24/D4, Apr 2009 used?

PC57.12.24/D4, Apr 2009 is commonly relevant in distribution and industrial power systems that use phase transformers within the listed kVA and voltage ranges. It may be used when specifying equipment for substations, plant electrical networks, and other low- to medium-voltage power applications. Engineers, buyers, and testing teams may consult it when reviewing transformer ratings, installation compatibility, or procurement documents for systems where dependable voltage transformation and controlled performance are important.

Importance in practice

In practice, this standard helps reduce ambiguity when evaluating smaller phase transformers for power, energy, and related industrial uses. PC57.12.24/D4, Apr 2009 supports more consistent design and testing expectations, which can improve safety, procurement clarity, and equipment interchangeability. It also helps organizations compare products against a defined technical baseline, reducing the risk of misapplication or underspecified performance. For legacy projects, it can be especially useful when documenting compliance or reviewing older transformer specifications.

• Phase transformers up to 3750 kVA
• High-voltage scope to 34 500 GrdY/19 920 volts
• Low-voltage scope to 600 volts and below
• Power and energy application context
• Useful for specification and compliance review