IEEE C37.106-1987

IEEE C37.106-1987 is a technical guide focused on abnormal frequency protection for power generating plants. It addresses how generating equipment should respond when system frequency moves outside acceptable limits, helping engineers plan protective actions that support safe operation and equipment integrity. In power, energy and industry applications, this guidance is important for coordinating generator protection, limiting damage during frequency disturbances, and improving the consistency of operating practices across plant designs.

About IEEE C37.106-1987

IEEE C37.106-1987 provides guidance for designing and applying abnormal frequency protection in generating facilities. Its purpose is to help define protection settings, operating thresholds, and coordination practices for conditions where frequency falls too low or rises too high. The document is relevant to electrical protection engineering because frequency excursions can affect rotating machines, auxiliary systems, and overall plant stability. As a result, IEEE C37.106-1987 is often used as a reference when establishing practical protection requirements for generation assets.

Where is IEEE C37.106-1987 used?

This standard is commonly used in power generating plants where abnormal frequency conditions must be managed carefully, including utility generation units, industrial self-generation sites, and other facilities with rotating electrical generation equipment. It is especially useful during protection studies, relay setting development, and equipment coordination for generators connected to interconnected power systems. IEEE C37.106-1987 helps engineers align frequency protection practices with the operational needs of generators, turbines, and associated plant systems.

Importance in practice

In practice, IEEE C37.106-1987 supports safer and more consistent protection design by giving engineers a common basis for handling frequency-related disturbances. Proper application can reduce the risk of equipment stress, avoid unnecessary trips, and improve coordination between protection devices and plant operating limits. For procurement and specification work, it also helps define clearer technical expectations. Although the standard is superseded, it remains useful as a reference for understanding legacy frequency protection approaches and historical design decisions.

• Abnormal frequency protection guidance
• Generator and plant coordination
• Protection settings and thresholds
• Legacy power system reference