ROCOF


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ROCOF

(Rate of OCcurence Of Failure) See reliability.
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The values for frequency error (FE) and ROCOF error (RFE) are not presented.
It can be seen from 14) that the cycle time also depends on the value of [f.sub.1] and it changes adaptively to shorten the duration of the disturbance and keep the absolute value of the ROCOF equal to 1.5/[T.sub.1].
Alternatively, there are test statistics which can be used to look for an increasing and/or decreasing trend in ROCOF data.
Furthermore, the paper presented the appropriate statistical methods to assess the validity (or otherwise) of such a procedure, and detailed the calculation of the ROCOF curves and the Laplace test for trend.