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The SYNCHK_RY function consists of several over-voltage and under-voltage and
synchronizing relays (OV, UV, and SyncRys) integrated within the synchronization check
feature (SYNCHK). The SYNCHK function issues permissive signals to the DPSY functions;
hence, ensuring that the DPSY functions are only able to close the CB when the required
conditions for closure have been satisfied.
SYNCHK_Ry:
Function ID: 561081
OVr relay (59r) for running line
OVi relay (59i) for incoming line
UVr relay (27r) for running line
UVi relay (27i) for incoming line
†Note: The DPSY function is discussed separately. See Chapter
application: Double position controller with synchronizing-check
‡Note: To simplify the description, only the SYNCHK1 (SYNCHK_Ry1) function is
discussed; however, the same description is applicable to the SYNCHK2
(SYNCHK_Ry2) function. The user should read the expression for SYNCHK1 as
SYNCHK2 unless a special explanation or instruction has been provided (e.g., the
user can reason by analogy that the feature in the OVr2 relay is identical to the
OVr1 relay).
Relays to check line-outage
4.5.1
The voltage condition for either line being out of service or being in service is verified using OV
and UV relays in the SYNCHK_Ry1 function.
Setting Name
Description
OVR1
Checking Live-Running Voltage
UVR1
Checking Dead-Running Voltage
OVI1
Checking Live-Incoming Voltage
UVI1
Checking Dead-Incoming Voltage
Overvoltage-relay elements (OVr1, OVi1)
(i)
Two overvoltage-relay elements (OVr1 and OVi1) are provided to determine the voltage
presence between running and incoming lines. In Figure 4.5-1 the hatched area depicts the
SYNCHK; Function ID:
Verification of voltage
synchronization between
SyncRy (ΔV)
SyncRy (Δθ)
SyncRy (Δf)
SyncRy (θ≈0)
Figure
Outline of SYNCHK function
Table 4.5-1 Settings in SYNCHK_Ry1
- 596 -
560001
Permission signal
conditions and
issued to DPSY
networks
DPSY function†
Issue CB closing
Control and monitoring
Default
51V
13V
51V
13V
6F2T0207 (0.01)
logics
command
.
Range
10 to 150 V
10 to 150 V
10 to 150 V
10 to 150 V
GRE200 (5,6)
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