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Setting [FRQ-RCD]: Figure 2.19-11 examples another example when the [FRQ-
RCD] has 20 Hz/s setting. The 'FRQ-RC' signal will be generated during the 'Loss
of synchronism', when the Δf/Δt is larger or more than the setting.
Frequency(Hz)
f0 + 3.0
f0 + 2.5
f0 + 2.0
f0 + 1.5
f0 + 1.0
f0 + 0.5
Nominal (f0)
f0 – 0.5
0
0.2
Figure 2.19-11 Change due for Loss of synchronism
Setting [FRQ-RCD-OF]: Figure 2.19-12 exemplify FRQ-RC signal is generated
when the frequency (f0) is greater or more than f0+0.5Hz.
Frequency(Hz)
f0 + 3.0
f0 + 2.5
f0 + 2.0
f0 + 1.5
f0 + 1.0
f0 + 0.5
Nominal (f0)
f0 – 0.5
0
0.2
Figure 2.19-12 RCD-AR over-frequency setting
Downing(Δf/Δt=20Hz/s)
0.4
0.6
0.8
1.0
[FRQ-RCD-AR-OF]=+0.5Hz
0.4
0.6
0.8
1.0
- 214 -
Rising(Δf/Δt=20Hz/s)
1.2
1.4
1.6
1.8
Time (sec)
1.2
1.4
1.6
1.8
Time (sec)
6F2T0207 (0.01)
2.0
2.0
GRE200 (5,6)
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