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Synchronization check relays
4.5.2
Figure 4.5-3 shows the variance of voltages, phase-angles and frequencies for Vr and Vi.
Setting [SyncRy1-dV]
Figure 4.5-3 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 4.5-4 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.
Settings [OVR1]
and [OVI1]
V i
V r
V
- 598 -
Setting [SyncRy1-Angle]
Δ
6F2T0207 (0.01)
GRE200 (5,6)
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