Toshiba GR-200-5 Instruction Manual

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6F2T0207 (0.01)GRE200 (5,6)- 213 -change; the signal is reset when the frequency comes back from the activerage.(ii) RCD characteristicsSetting [FRQ-RCD]: Figure 2.19-9 exemplifies ‘Loss of synchronism’. Thefrequency (f0) changes rapidly at 0.5 sec. and 1.5 sec. When the [FRQ-RCD] has20 Hz/s setting, the ‘FRQ-RC’ signal will be generated, because the Δf/Δt is largeror more than the setting.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0Frequency(Hz)Time (sec)Rising(Δf/Δt=20Hz/s) Downing(Δf/Δt=20Hz/s)f0 + 0.5Nominal (f0)f0 – 0.5f0 – 1.0f0 – 1.5f0 – 2.0f0 – 2.5Figure 2.19-9 Frequency change due for Loss of synchronismSetting [FRQ-RCD-UF]: Figure 2.19-10 exemplifies FRQ-RC signal is generatedwhen the frequency (f0) is smaller or less than f0–0.5Hz. Thus, FRQ-trip will beforbidden during the generation of FRQ-RC signal. When the frequency comesback to the normal, FRQ-trip will be permitted.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0Frequency(Hz)Time (sec)[FRQ-RCD-AR-UF]=-0.5Hzf0 + 0.5Nominal (f0)f0 – 0.5f0 – 1.0f0 – 1.5f0 – 2.0f0 – 2.5Figure 2.19-10 RCD-AR under-frequency setting