IEEE PC37.013a/D3

IEEE PC37.013a/D3 is an unapproved draft standard for AC high voltage generator circuit breakers rated on a symmetrical current basis, with Amendment 1 adding supplementary guidance for use with generators rated 10-100 Mva. It addresses how these breakers are specified and applied in power system environments where generator fault duties, interruption performance, and rating coordination are critical. For engineers and buyers working in power, energy, and industrial applications, this technical document helps frame expectations for design and evaluation.

IEEE PC37.013a/D3 overview

This draft specification focuses on AC high voltage generator circuit breakers and the conditions that affect their application to generator installations. IEEE PC37.013a/D3 is relevant where symmetrical current rating is used to describe breaker capability, especially in the context of medium-size generators in the 10-100 Mva range. The amendment supplements the base document by refining the technical basis for selection, rating, and system compatibility, making it useful when comparing equipment for generator protection and switching duties.

Typical use cases

IEEE PC37.013a/D3 is typically consulted during the planning or review of generator circuit breaker applications in power stations, industrial cogeneration plants, and other electrical systems that connect generators to high voltage switchgear. It may be used when evaluating breaker suitability for generator output circuits, coordinating protection settings, or checking whether the equipment ratings align with the generator’s symmetrical current characteristics. The document is most relevant where reliable interruption and system integration are essential.

Why this standard matters

This standard matters because generator circuit breakers must perform consistently under demanding fault and switching conditions while matching the electrical characteristics of the connected generator. IEEE PC37.013a/D3 supports more disciplined design review, procurement, and testing by giving a shared technical reference for rating basis and application limits. In practice, that can reduce specification errors, improve safety margins, and help avoid mismatches between breaker capability and generator duty.

• AC high voltage generator circuit breakers
• Symmetrical current rating basis
• Generators rated 10-100 Mva
• Application and selection guidance
• Power, energy, and industrial systems