IEEE PC37.117/D7.0
Guide for the Application of Protective Relays Used for Abnormal Frequency Load Shedding and Restoration Sponsored by the Power Systems Relaying Committee of the IEEE Power Engineering Society
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- Language: English
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- Language: English
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About This Item
IEEE PC37.117/D7.0 is a technical standard draft for protective relays used in abnormal frequency load shedding and restoration within power systems. It addresses how relays can support coordinated underfrequency and overfrequency response, helping utilities and industrial operators maintain system stability during frequency excursions. As a guide for application, it is relevant where power, energy, and industry applications depend on reliable load management and restoration practices.
IEEE PC37.117/D7.0 overview
This document focuses on the application of protective relays in frequency-based load shedding schemes and the subsequent restoration of load after conditions return to acceptable levels. IEEE PC37.117/D7.0 is intended to help engineers apply relay functions in a controlled, consistent way for abnormal frequency events. In practical terms, it supports planning, coordination, and implementation decisions where relay settings and operating logic influence grid response and service continuity.
Typical use cases
Common use cases include utility substations, distribution feeders, and industrial facilities that rely on automatic load shedding to limit the impact of frequency deviation. IEEE PC37.117/D7.0 may be used when designing relay schemes for staged shedding, restoration sequencing, or coordination with system protection and control practices. It is especially relevant in environments where rotating machinery, process loads, or critical feeders must be managed carefully during power system disturbances.
Why this standard matters
This standard matters because frequency-related load shedding is a practical safeguard against wider system instability. By guiding the application of protective relays, IEEE PC37.117/D7.0 can help improve consistency in design and testing, support clearer procurement and specification decisions, and reduce operational risk. It also provides a useful reference when evaluating how relay-based protection should respond to abnormal frequency conditions without unnecessary load loss or delayed restoration.
- Abnormal frequency load shedding
- Load restoration practices
- Protective relay application guidance
- Power system coordination
- Industrial and utility frequency response
- Publication Date: 2006
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- This Version: PC37.117 (2006)
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