The bus and line frequencies must also be within a range of ±10% from the
rated frequency. When the synchronizing option is included also for
autoreclose there is no reason to have dif
ferent 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 U-Bus and U-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
23 below shows the maximum settable value for tBreaker when
CloseAngleMax is set to 15 or 30 degrees, at dif
ferent 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 23: 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
The reference voltage can be phase-neutral L1, L2 or positive sequence. By setting
the phases used for SESRSYN, with the settings SelPhaseBus and SelPhaseLine, a
compensation has to be made for the phase angle difference caused if dif
ferent
setting values are selected for the two sides of the breaker. This compensation has
to be done with the PhaseShift setting according to Table
24.
Section 12 1MRK 506 375-UEN A
Control
212 Railway application RER670 2.2 IEC
Application manual
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