IEEE C57.135-2001
Shifting Transformers
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About This Item
C57.135-2001 is a technical standard for shifting transformers, addressing their design and application within power, energy, and related industrial systems. It helps define how these transformers are identified and evaluated so engineers and procurement teams can work from a consistent reference. For equipment used in controlled voltage or phase-shifting arrangements, this standard supports clearer specification, better comparison between products, and more dependable project planning.
C57.135-2001 overview
The C57.135-2001 standard focuses on shifting transformers and the technical expectations tied to their use in electrical power applications. It is intended to guide how these units are described, selected, and assessed in contexts where transformer behavior must support system operation and power flow control. For users working with utility or industrial power equipment, the standard provides a common basis for engineering language, compliance review, and product documentation.
Typical use cases
This standard is typically relevant when specifying or evaluating shifting transformers for power transmission, substation planning, or other grid-connected equipment where controlled phase or voltage shifting may be part of the design. It may also be used by manufacturers, utilities, and engineering firms preparing technical requirements, bid documents, or acceptance criteria. In practice, C57.135-2001 is useful anywhere transformer selection must align with system performance expectations and electrical integration needs.
Why this standard matters
Clear standards help reduce ambiguity in transformer procurement and engineering work, and C57.135-2001 serves that role for shifting transformers. It can support consistency in design review, testing expectations, and documentation so that equipment is compared on a like-for-like basis. That matters in power applications where incorrect interpretation can affect performance, compatibility, and operational reliability. Using the standard helps organizations manage technical risk and improve confidence in specification decisions.
- Shifting transformer terminology
- Power system application focus
- Specification and procurement support
- Design and evaluation reference
- Consistency for utility and industrial use
- Publication Date: 2002
- Standard Status: Active
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
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