•
The voltages V-Line and V-Bus are higher than the set values for
VHighBusSynch
and
VHighLineSynch
of the respective base voltages
GblBaseSelBus
and
GblBaseSelLine
.
•
The difference in the voltage is smaller than the set value of
VDiffSynch
.
•
The difference in frequency is less than the set value of
FreqDiffMax
and larger
than the set value of
FreqDiffMin
. If the frequency is less than
FreqDiffMin
the
synchronism check is used and the value of
FreqDiffMin
must thus be identical to
the value
FreqDiffM
resp
FreqDiffA
for synchronism check function. The bus and
line frequencies must also be within a range of ±5 Hz from the rated frequency.
When the synchronizing option is included also for autoreclose there is no reason
to have different frequency setting for the manual and automatic reclosing and the
frequency difference values for synchronism check should be kept low.
•
The frequency rate of change is less than set value for both V-Bus and V-Line.
•
The difference in the phase angle is smaller than the set value of
CloseAngleMax
.
•
The closing angle is decided by the calculation of slip frequency and required pre-
closing time.
The synchronizing function compensates for the measured slip frequency as well as the
circuit breaker closing delay. The phase angle advance is calculated continuously. The
calculation of the operation pulse sent in advance is using the measured
SlipFrequency
and the set
tBreaker
time. To prevent incorrect closing pulses, a maximum closing
angle between bus and line is set with
CloseAngleMax
. Table
maximum settable value for
tBreaker
when
CloseAngleMax
is set to 15 or 30 degrees,
at different allowed slip frequencies for synchronizing. To minimize the moment stress
when synchronizing near a power station, a narrower limit for the
CloseAngleMax
needs to be used.
Table 37:
Dependencies between tBreaker and SlipFrequency with different CloseAngleMax
values
tBreaker [s] (max settable value)
with
CloseAngleMax = 15 degrees
[default value]
tBreaker [s] (max settable value) with
CloseAngleMax = 30 degrees [max
value]
SlipFrequency [Hz]
(BusFrequency -
LineFrequency)
0.040
0.080
1.000
0.050
0.100
0.800
0.080
0.160
0.500
0.200
0.400
0.200
0.400
0.810
0.100
1.000
0.080
0.800
0.050
1.000
0.040
Section 12
1MRK 505 370-UUS A
Control
294
Busbar protection REB670 2.2 ANSI
Application manual
Summary of Contents for RELION REB670
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