IEEE C57.12.34-2015
Phase Distribution Transformers, 10 MVA and Smaller; High-Voltage, 34.5 kV Nominal System Voltage and Below; Low-Voltage, 15 kV Nominal System Voltage and Below - Redline
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About This Item
C57.12.34-2015 is a technical standard for phase distribution transformers rated at 10 MVA and smaller, covering high-voltage systems at 34.5 kV nominal and below, with low-voltage windings at 15 kV nominal and below. It helps define the design and performance expectations for equipment used in power and energy applications, supporting more consistent engineering, procurement, and testing. This redline edition is useful when reviewing changes against the previous requirements for distribution transformer specifications.
What is C57.12.34-2015?
This standard sets out requirements for phase distribution transformers within a defined voltage and power range, making it relevant to transformer construction, ratings, insulation coordination, materials, and related performance considerations. C57.12.34-2015 is used as a technical reference when specifying equipment that must operate reliably on distribution networks. Because it focuses on smaller transformers and nominal voltage limits, it is particularly useful for aligning manufacturer designs with expected utility and industrial application needs.
Where is C57.12.34-2015 used?
This document is commonly applied in distribution systems where phase transformers step voltages down for local service, feeder applications, and facility-level power delivery. It is relevant to utilities, industrial plants, and other operators that select or evaluate transformer equipment for networks with the stated voltage limits. C57.12.34-2015 may also support specification review, bid comparison, and acceptance testing when transformer performance and ratings need to be checked against a recognized technical basis.
Why is C57.12.34-2015 important?
C57.12.34-2015 matters because transformer requirements affect safety, reliability, and compatibility in power distribution equipment. Clear technical criteria can reduce ambiguity during design, manufacturing, and procurement, while also helping teams compare products on a consistent basis. For organizations responsible for compliance or asset selection, the standard supports more controlled decision-making and can lower the risk of mismatch between system voltage, transformer rating, and expected operating conditions.
- Phase distribution transformer requirements
- 10 MVA and smaller rating scope
- 34.5 kV nominal high-voltage limit
- 15 kV nominal low-voltage limit
- Redline comparison format
- Publication Date: 2015
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications; Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: C57.12.34 (2022)
- This Version: C57.12.34 (2015)
- Previous Version: C57.12.34 (2010)
- Previous Version: C57.12.34 (2005)
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