IEEE PC57.12.20
IEEE Draft Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34 500 Volts and Below; Low Voltage, 7970/13 800Y Volts and Below
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Language: English
License Type: Single User
Updates: Not Included
About This Item
IEEE PC57.12.20 is a draft standard for overhead type distribution transformers rated 500 kVA and smaller, covering high voltage up to 34,500 volts and low voltage up to 7,970/13,800Y volts. It is relevant to power and energy applications where transformer design, ratings, and performance need clear technical definition. For utilities, engineers, and procurement teams, IEEE PC57.12.20 helps frame the requirements that support consistent equipment selection and dependable service.
About IEEE PC57.12.20
This technical document addresses overhead distribution transformers intended for smaller-capacity applications, with defined limits for both primary and secondary voltage levels. IEEE PC57.12.20 is used to guide how these transformers are specified, evaluated, and compared within the IEEE framework for power equipment. Its focus on voltage class and kVA rating makes it especially useful where design criteria, insulation coordination, and operational expectations must be aligned with established engineering practice.
Where is IEEE PC57.12.20 used?
IEEE PC57.12.20 is most applicable in utility distribution systems and related electrical infrastructure that rely on overhead transformers to step voltage down for local delivery. It may be referenced in equipment specification, product review, and acceptance processes for transformers serving residential neighborhoods, light commercial loads, and similar distribution feeders. The standard is also useful in engineering workflows where voltage ratings, transformer capacity, and installation context must be matched to a defined technical baseline.
Importance in practice
In practice, IEEE PC57.12.20 supports better control over transformer selection and helps reduce uncertainty in design and procurement. By defining the scope for smaller overhead distribution units, it can improve consistency in ratings, testing expectations, and compatibility with network requirements. That matters for safety, performance, and long-term reliability, especially when utilities and engineers need equipment that fits a specific voltage class and operating duty without unnecessary variation.
- Overhead distribution transformer scope
- 500 kVA and smaller capacity
- High-voltage and low-voltage rating limits
- Utility distribution application context
- Publication Date: 2010
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications; Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: PC57.12.20 (2023)
- Previous Version: PC57.12.20 (2017)
- Previous Version: PC57.12.20 (2017)
- Previous Version: PC57.12.20 (2016)
- Previous Version: PC57.12.20 (2011)
- This Version: PC57.12.20 (2010)
- Previous Version: PC57.12.20 (2004)
- Previous Version: PC57.12.20 (2004)
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