IEEE PC57.12.20/D10c
Approved 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High Voltage, 34 500 Volts and Below; Low Voltage, 7970/13 800Y Volts and Below (Revision of IEEE C57.12.20-1997) Superseded by C57.12.20-2005
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Language: English
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About This Item
IEEE PC57.12.20/D10c is an inactive draft standard for overhead type distribution transformers, covering units rated 500 kVA and smaller. It addresses high-voltage levels up to 34,500 volts and low-voltage levels up to 7,970/13,800Y volts, making it relevant to power, energy, and industry applications. As a revision of IEEE C57.12.20-1997 and later superseded by C57.12.20-2005, it reflects a specific stage in transformer design and compliance requirements.
IEEE PC57.12.20/D10c overview
This document provides draft technical requirements for overhead distribution transformers used in utility and industrial power systems. IEEE PC57.12.20/D10c focuses on ratings, construction considerations, and performance expectations for smaller transformers that operate at defined high- and low-voltage limits. In practice, it helps engineers, manufacturers, and purchasers align on the design basis for transformer evaluation, testing, and specification before the later superseding revision was issued.
Typical use cases
IEEE PC57.12.20/D10c is typically used when specifying overhead distribution transformers for feeder and local distribution networks where compact equipment and defined voltage ratings are important. It may support procurement and engineering work for pole-mounted transformers serving utility distribution circuits, industrial facilities, or regional power delivery systems. The standard is also useful for reviewing construction and performance requirements during transformer selection, acceptance testing, and technical comparison of compliant equipment.
Why this standard matters
This standard matters because it gives a clear reference point for consistency in transformer design and evaluation within power and energy applications. IEEE PC57.12.20/D10c can help reduce procurement ambiguity by defining the applicable voltage and kVA scope for overhead units, which supports safer specification and more reliable testing. For stakeholders working with distribution equipment, it also helps limit compatibility issues and improves confidence that equipment expectations are aligned across engineering and supply chains.
- Overhead type distribution transformers
- 500 kVA and smaller ratings
- High-voltage scope up to 34,500 V
- Low-voltage scope up to 7,970/13,800Y V
- Draft revision later superseded by C57.12.20-2005
- Publication Date: 2004
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- 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)
- Previous Version: PC57.12.20 (2010)
- This Version: PC57.12.20 (2004)
- Previous Version: PC57.12.20 (2004)
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