Toshiba GR-200-5 Instruction Manual page 629

Synchronization check
4.5.4
The user should set On for scheme switch [SYNC01-SYNCHK1EN] when synchronization check
is required.
Synchronization conditions
(i)
The synchronizing relays are used to check the respective conditions of the incoming-line and
the running-line. For example, the ∆V, ∆θ, and ∆f variances of Vi and Vr may be examined
when the SYNCHK function is used in a synchronous network. Conversely, the ∆θ reducing-
degree feature can be applied for asynchronous networks; the SYNCHK function can use
signals '∆θ1≈0' and '∆θ1_less' in order to decide whether the difference-angle is reducing. Thus,
the SYNCHK function is required to have two sets of check logic covering both (1) synchronous
conditions and (2) asynchronous conditions.
SyncRy1
-dV
SyncRy1
-df
SyncRy1
-dƟ
SyncRy1
-Ɵ≈0
SyncRy1
-Ɵ less
Figure 4.5-12 Synchronization check relays in SYNCHK_Ry1
SyncRy2
-dV
SyncRy2
-df
SyncRy2
-dƟ
SyncRy2
-Ɵ≈0
SyncRy2
-Ɵ less
Figure 4.5-13 Synchronization check relays in SYNCHK_Ry2
Figure 4.5-14 shows the synchronization check logic in the SYNCHK1 function. The user
should note that the logic has been separated for (1) the synchronous condition and (2) the
asynchronous condition;
"DPSY01_OEC_RCV" signal is received, which is identical to an operate-command in the On-
direction.
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ΔV1: Voltage-variance of Running and Incoming
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Δf1: Frequency-variance of Running and Incoming
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ΔƟ1: Phase-variance of Running and Incoming
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ΔƟ1≈0: Phase-variance being near zero between Running and Incoming
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ΔƟ1 less: Reducing in phase-valiance
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ΔV2: Voltage-variance of Running and Incoming
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Δf2: Frequency-variance of Running and Incoming
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ΔƟ2: Phase-variance of Running and Incoming
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ΔƟ2≈0: Phase-variance being near zero between Running and Incoming
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ΔƟ2 less: Reducing in phase-valiance
the synchronization
- 609 -
To check for Synchronous network
To check for Asynchronous network
To check for Synchronous network
To check for Asynchronous network
check logic is initiated
6F2T0207 (0.01)
when the
GRE200 (5,6)