IEEE C57.13.3-2005
IEEE Guide for Grounding of Instrument Transformer Secondary Circuits and Cases
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About This Item
IEEE C57.13.3-2005 is a technical guide for grounding the secondary circuits and cases of instrument transformers, with attention to power, energy, and industry applications. It addresses how these grounding practices help support safer installation, clearer protection and metering behavior, and more consistent system performance. For engineers, specifiers, and maintenance teams, this standard provides a focused reference for reducing grounding-related errors in transformer secondary wiring and equipment cases.
Overview of IEEE C57.13.3-2005
IEEE C57.13.3-2005 addresses the grounding of instrument transformer secondary circuits and cases in electrical systems where accurate measurement and protective functions are important. The document is relevant to installations using current transformers and voltage transformers, where secondary grounding practices can affect safety, insulation stress, and the reliability of connected devices. As a superseded standard, it is still useful for understanding legacy design intent, installation practice, and compliance references in power and industrial environments.
Typical use cases
This standard is commonly used when specifying or reviewing grounding methods for instrument transformer secondary wiring in substations, switchgear, control panels, and utility or industrial metering systems. It may also guide work on protection relays, test circuits, and transformer cases where secondary conductors need a controlled grounding approach. IEEE C57.13.3-2005 is especially relevant when coordinating installation details across engineering, procurement, commissioning, and maintenance activities.
Why it matters
Proper grounding of instrument transformer secondary circuits is important for safety, measurement integrity, and dependable operation of protective equipment. IEEE C57.13.3-2005 helps reduce the risk of unexpected voltage on secondary circuits, supports consistent installation practice, and can improve coordination between design and field wiring. For organizations managing legacy power and industrial assets, the standard offers a practical reference for documentation, inspection, and technical review.
- Secondary circuit grounding practices
- Instrument transformer cases
- Metering and protection applications
- Substation and switchgear installations
- Legacy compliance reference
- Publication Date: 2006
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C57.13.3 (2015)
- This Version: C57.13.3 (2006)
- Previous Version: C57.13.3 (1988)
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