IEEE PC62.21/D2, Jul 2007
IEEE Draft Guide for the Application of Surge Voltage Protective Equipment on Ac Rotating Machinery 1000 Volts and Greater Corrigendum 1: Replace Table 2 and Annex A.1 and A.2 (Corregendium to Iee Std C62.21-2003)
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About This Item
IEEE PC62.21/D2, Jul 2007 is a draft guide for applying surge voltage protective equipment to AC rotating machinery rated 1000 volts and greater. It addresses a focused protection problem in power, energy and industry applications, where transient overvoltages can threaten machine insulation and operating reliability. This corrigendum to IEEE Std C62.21-2003 is relevant for engineers who need clearer guidance on equipment protection, especially where Table 2 and Annex A are part of the technical reference.
What is IEEE PC62.21/D2, Jul 2007?
IEEE PC62.21/D2, Jul 2007 is a technical document intended to refine guidance for surge voltage protection on high-voltage AC rotating machinery. As a draft corrigendum, it updates specific reference material rather than serving as a broad new installation code. The standard focuses on how surge protective equipment should be applied so that machine insulation, coordination practices, and voltage endurance are addressed in a consistent way. For users of IEEE PC62.21/D2, Jul 2007, the value lies in aligning design and application decisions with a defined technical basis.
Where is IEEE PC62.21/D2, Jul 2007 used?
This standard is most relevant in facilities and projects that specify or maintain AC rotating machinery at 1000 volts and above, including large motors and generators in power and industrial environments. IEEE PC62.21/D2, Jul 2007 may be used during equipment selection, surge protection review, maintenance planning, and engineering documentation for systems exposed to transient overvoltage conditions. It is especially useful where protective equipment must be coordinated with machine ratings and insulation expectations in a defined application workflow.
Why is IEEE PC62.21/D2, Jul 2007 important?
IEEE PC62.21/D2, Jul 2007 helps improve consistency when evaluating surge protection for rotating machinery, which can reduce the risk of insulation stress and premature equipment damage. For compliance, procurement, and engineering review, a clear reference supports better decision-making and more predictable protection practice. Because this document revises specific tables and annex material, it can also help teams avoid using outdated guidance when comparing technical requirements, testing assumptions, or applying surge protective equipment in high-voltage machine systems.
- Draft corrigendum to IEEE Std C62.21-2003
- Applies to AC rotating machinery 1000 V and greater
- Focuses on surge voltage protective equipment
- Includes revisions to Table 2 and Annex A.1 and A.2
- Relevant to power, energy, and industrial applications
- Publication Date: 2007
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: PC62.21 (2008)
- Previous Version: PC62.21 (2007)
- Previous Version: PC62.21 (2007)
- This Version: PC62.21 (2007)
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