ABB RELION 650 Series Applications Manual page 166

Section 11
Control
The set value is added to the measured line phase angle. The bus voltage is reference voltage.
Synchronizing settings
OperationSynch
The setting
service mode and the output signal depends on the input conditions.
UHighBusSynch and UHighLineSynch
The voltage level settings shall be chosen in relation to the bus/line network voltage. The
threshold voltages
where the network is expected to be synchronized. A typical value is 80% of the rated voltage.
UDiffSynch
Setting of the voltage difference between the line voltage and the bus voltage. The difference
is set depending on the network configuration and expected voltages in the two networks
running asynchronously. A normal setting is 0.10-0.15 p.u.
FreqDiffMin
The setting
to be asynchronous. For frequency differences lower than this value, the systems are
considered to be in parallel. A typical value for
should be low if both synchronizing and synchrocheck functions are provided, and it is better
to let the synchronizing function close, as it will close at exactly the right instance if the
networks run with a frequency difference.
FreqDiffMax
The setting
FreqDiffMax shows the time for the vector to move 360 degrees, one turn on the
synchronoscope, and is called Beat time. A typical value for
gives beat times on 4-5 seconds. Higher values should be avoided as the two networks
normally are regulated to nominal frequency independent of each other, so the frequency
difference shall be small.
FreqRateChange
The maximum allowed rate of change for the frequency.
tBreaker
tBreaker shall be set to match the closing time for the circuit breaker and should also
The
include the possible auxiliary relays in the closing circuit. It is important to check that no slow
logic components are used in the configuration of the IED as there then can be big variations
in closing time due to those components. Typical setting is 80-150 ms depending on the
breaker closing time.
tClosePulse
The setting for the duration of the breaker close pulse.
tMaxSynch
160
Off disables the Synchronizing function. With the setting On , the function is in the
UHighBusSynch and UHighLineSynch have to be set lower than the value
FreqDiffMin is the minimum frequency difference where the systems are defined
To avoid overlapping of the synchronizing function and the synchrocheck
function the setting
FreqDiffM , respective FreqDiffA used for synchrocheck.
setting
FreqDiffMax is the maximum slip frequency at which synchronizing is accepted. 1/
FreqDiffMin is 10 mHz. Generally, the value
FreqDiffMin must be set to a higher value than used
1MRK 504 158-UEN A
FreqDiffMax is 200-250 mHz, which
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