Toshiba GR 200 Series, Инструкция по эксплуатации

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 677 -
4.6.2
Synchronization check relays
Figure 4.6-3 shows the variance of voltages, phase-angles and frequencies for Vr and Vi.
Δ 
Setting [
SyncRy1-Angle
]
Setting [
SyncRy1-dV
]
Settings [
OVR1
]
and [
OVI1
]
Vr
Vi
 V
Figure 4.6-3 Permissible ranges for connections between synchronous networks
The provision of a signal for CB closure between two networks may be required subject
to the variance of the two voltages, phase-angles and frequencies being small. Therefore, the
SYNCHK function continuously monitors the Δθ, ΔV and Δf; subsequently the SYNCHK
function issues an operate-permission signal to the DPSY function when the variance is less
than the permissible range. For this purpose, synchronism-relays (SyncRy1-dV, SyncRy1-df,
SyncRy1-dθ) are provided; the user can set them in accordance with their specific requirements.
Figure 4.6-4 shows the angle-variance between Vi and Vr; the increment or decrement of
the angle-variance (Δθ) is shown based upon the running voltage Vr.
When connection between asynchronous networks is required, the split-synchronism-
check elements (SyncRy-θ=0 and SyncRy-θless) are used so that the connection will be
performed when the angle-variance Δθ is small.