IEEE C37.102-1987

IEEE C37.102-1987 is a technical guide focused on AC generator protection in power, energy, and industrial applications. It outlines the protection considerations commonly used to help safeguard synchronous generators from electrical and operational faults that can affect reliability, safety, and equipment life. As a superseded standard, it remains relevant for understanding legacy design approaches, review of existing installations, and comparison against later protection practices.

Overview of IEEE C37.102-1987

This guide addresses the planning and application of protective relaying and related practices for AC generators. IEEE C37.102-1987 is intended to help engineers evaluate fault conditions, abnormal operating states, and protective functions associated with generator units and their interfaces. In practical terms, it provides a structured reference for selection and coordination of protection methods, especially where generator reliability and continuity of service are important. It is most useful in systems where generator protection must be aligned with electrical design and operating requirements.

Typical use cases

IEEE C37.102-1987 is typically used when specifying or reviewing protection schemes for AC generators in utility plants, industrial power systems, and other generating installations. It may support studies for relay coordination, generator fault response, and protection settings tied to machine characteristics and system behavior. Engineers, consultants, and maintenance teams can use it when assessing existing generator protection arrangements, planning upgrades, or comparing equipment protection practices across rotating machine applications.

Why it matters

Proper generator protection is essential for reducing damage, limiting outage risk, and improving operational consistency. IEEE C37.102-1987 matters because it gives a recognized framework for evaluating how protection should be applied to AC generators in demanding power applications. It can support safer engineering decisions, clearer procurement requirements, and more consistent testing or review of protection schemes. For organizations managing legacy systems, the standard also helps document technical expectations and maintain design control.

• AC generator protection guidance
• Protective relay application
• Legacy power system reference
• Superseded IEEE standard
• Generator fault and abnormal condition coverage