Eaton EMR-4000 Installation, Operation And Maintenance Manual page 627

81R – Rate of Change of Frequency (df/dt);
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81UR – Underfrequency and Rate of Change of Frequency (df/dt);
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81OR – Overfrequency and Rate of Change of Frequency (df/dt);
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81UΔR – Underfrequency and DF/DT (absolute frequency change per definite time interval);
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81OΔR – Overfrequency and DF/DT (absolute frequency change per definite time interval); and
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78V – Vector Surge.
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EMR-4000
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