IEEE C37.110-2007
IEEE Guide for the Application of Current Transformers Used for Protective Relaying Purposes
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- Language: English
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About This Item
IEEE C37.110-2007 is a technical guide for applying current transformers used in protective relaying applications. Focused on power, energy, and industrial systems, it helps engineers interpret CT performance in relay circuits where accuracy and response are critical. This standard is useful when selecting, specifying, or reviewing current transformers for protection duties, where incorrect application can affect system reliability, fault detection, and overall coordination.
Overview of IEEE C37.110-2007
This guide addresses the application of current transformers in protective relaying service, with emphasis on how transformer characteristics affect relay operation. IEEE C37.110-2007 is intended to support practical engineering decisions for protective schemes by clarifying the relationship between CT behavior, burden, and relay performance. It is especially relevant in installations where accurate current reproduction is needed during normal and fault conditions. The document serves as a technical reference for planning and evaluating protection-related CT use.
Typical use cases
This standard is commonly consulted during the design and review of protective relaying systems for substations, feeders, generators, and other power equipment. It may be used when choosing current transformers for overcurrent, differential, or ground-fault protection, or when checking whether a CT is suitable for a specific relay burden and fault duty. IEEE C37.110-2007 is also helpful in procurement and engineering studies where CT application details need to match protection requirements in utility or industrial power networks.
Why it matters
Correct CT application is essential to dependable protection, and IEEE C37.110-2007 helps reduce the risk of misapplication. By guiding engineers through CT performance considerations for relaying, it supports better design control, safer operation, and more consistent system behavior under fault conditions. The guide can also improve specification quality and testing decisions, making it easier to compare equipment and verify that protective functions will operate as intended in service.
- Protective relaying current transformer application
- Burden and relay performance considerations
- Fault-duty and accuracy evaluation
- Utility and industrial power system use
- Publication Date: 2008
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C37.110 (2023)
- Previous Version: C37.110 (2011)
- This Version: C37.110 (2008)
- Previous Version: C37.110 (1996)
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