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What is the relationship between GREF and PMECH

Based on this PPSPY post "What is the base value for the generator GREF? " the GREF is represented as

 GREF = DROOP*PMECH

However, I sometimes encounter cases where this equation is not giving the expected answer compared to PSSE simulations. Is this GREF equation a general equation for all governor models? or is the equation different for different models?