IEEE C57.12.22-1995
Voltage Bushings, 2500 kVA and Smaller; High Voltage, 34 500 GrdY/19 920 Volts and Below; Low Voltage, 480 Volts and Below
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About This Item
C57.12.22-1995 is a technical standard for voltage bushings used in power equipment rated 2500 kVA and smaller, with high-voltage service up to 34 500 GrdY/19 920 volts and low-voltage service up to 480 volts. It helps define the expected design and performance limits for these components in power, energy, and industrial applications. By setting clear requirements for bushing selection and evaluation, C57.12.22-1995 supports consistent engineering decisions and safer equipment integration.
C57.12.22-1995 overview
This standard addresses the electrical and construction requirements for voltage bushings intended for smaller transformers and similar equipment. C57.12.22-1995 is focused on the practical interface between internal windings and external connections, where insulation, voltage rating, and mounting details are critical. In this technical context, the standard provides a reference for design and testing expectations so manufacturers, buyers, and engineers can compare products on a common basis and reduce uncertainty during procurement and specification.
Typical use cases
This standard is typically relevant when specifying bushings for distribution transformers, compact power units, and other equipment in power systems where the ratings stay within the stated high- and low-voltage limits. It may be used during equipment design, factory testing, or purchasing reviews for utility, industrial, and facility power applications. C57.12.22-1995 is especially useful when the goal is to match bushing ratings with transformer size, insulation needs, and installation conditions.
Why this standard matters
For engineers and purchasers, C57.12.22-1995 matters because bushing performance directly affects reliability, safety, and long-term serviceability. Using a common standard helps reduce mismatches between voltage class, physical construction, and application requirements. It also supports clearer compliance checks and more consistent quality control during manufacturing and acceptance testing. For smaller power equipment, that consistency can lower the risk of insulation problems, premature failure, or costly field replacement.
- Voltage bushings for smaller transformers
- High-voltage limit: 34 500 GrdY/19 920 V
- Low-voltage limit: 480 V and below
- Design and testing reference for power equipment
- Inactive standard designation: C57.12.22-1995
- Publication Date: 1993
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- This Version: C57.12.22 (1993)
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