Project Details
This application guide assists the protection engineer in applying relays for the protection of generating plant equipment from damage caused by operation at abnormal frequencies including overexcitation. Consideration is given to the effect of abnormal frequency operation on those associated station auxiliaries whose response can affect plant output. The guide also presents background information regarding the hazards caused by operating generation equipment at abnormal frequencies. It documents typical equipment capabilities and describes acceptable protective schemes. Underfrequency protection can be provided by load shedding and/or a discrete underfrequency protective function. If both load shedding and a discrete protective function are used, then they must be coordinated.
Guidance is provided to help meet requirements from regional entities and regulatory bodies. The recommendations made pertain to typical synchronous generator installations but does not displace manufacturer guidance. The protective functions discussed in this guide may be implemented with a multifunction microprocessor based protection system.
Standards Committee | |
PAR Approval |
2018-09-27
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PARs |
Additional Resources Details
Historical Base Standard |
Working Group Details
Working Group |
C37.106_WG - Abnormal Frequency Protection for Power Generating Plants
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Standards Committee | |
Society | |
IEEE Program Manager | |
Existing Standards |
This guide has been prepared to assist the protection engineer in applying relays for the protection of generating plant equipment from damage caused by operation at abnormal frequencies including over excitation. Emphasis is placed on the protection of the major generating station components at steam generating stations, nuclear stations, and at combustion-turbine installations. Consideration is also given to the effect of abnormal frequency operation on those associated station auxiliaries whose response can affect plant output. The guide also presents background information regarding the hazards caused by operating generating equipment at abnormal frequencies. It documents typical equipment capabilities and describes acceptable protective schemes. Recommended methods for coordinating the under frequency protective scheme with system-load shielding schemes are also included. Sufficient information is provided to apply suitable coordinated protection for given specific situations.
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