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f-Protection Module – Frequency Protection [ANSI 81O/U] Parameter Description Setting range Default Menu path t Tripping delay 0.00 - 3600.00s 1.00s [Protection Para /<n> Only available if: Device planning: f.Mode = f< Orf>Or f> and df/dtOr f< and df/dt df/dt /f-Prot /f[1]] Measured value (calculated): 0.1 - 10.0Hz/s Rate-of-frequency-change. 1.0Hz/s /<n> Only available if: Device planning: f.Mode = df/dt Or f< and df/dt Or f> and df/dt t-df/dt Trip delay df/dt [Protection Para /f-Prot /f[1]] 0.00 - 300.00s 1.00s [Protection Para /<n> /f-Prot /f[1]] DF Frequency difference for the maximum admissable variation of the mean of the rate of frequency-change. This function is inactive if DF=0. 0.0 - 10.0Hz 1.00Hz [Protection Para /<n> /f-Prot /f[1]] Only available if: Device planning: f.Mode = f< and DF/DT Or f> and DF/DT DT Time interval of the maximum admissable rateof-frequency-change. 0.1 - 10.0s 1.00s /<n> /f-Prot Only available if: Device planning: f.Mode = f< and DF/DT Or f> and DF/DT df/dt mode delta phi /f[1]] df/dt mode absolute df/dt, Only available if: Device planning: f.Mode = df/dt Or f< and df/dt Or f> and df/dt Only available if: Device planning: f.Mode = df/dt Or f< and df/dt Or f> and df/dt Only available if: Device planning: f.Mode = df/dt positive df/dt, /<n> negative df/dt /f-Prot Measured value (calculated): 1 - 30° Vector surge Only available if: Device planning: f.Mode = delta phi Page 410 [Protection Para absolute df/dt [Protection Para /f[1]] 10° [Protection Para /<n> /f-Prot /f[1]] EN MRA4 04/09
