ABB Relion 650 Series Applications Manual page 132

Section 10
Control
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 include
The
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
time.
tClosePulse
Setting for the duration of the breaker close pulse.
tMaxSynch
tMaxSynch is set to reset the operation of the synchronizing function if the operation does
The
not take place within this time. The setting must allow for the setting of
decide how long it will take maximum to reach phase equality. At a setting of 10 ms the beat time
is 100 seconds and the setting would thus need to be at least
network frequencies are expected to be outside the limits from start a margin needs to be added.
Typical setting 600 seconds.
tMinSynch
tMinSynch is set to limit the minimum time at which synchronizing closing attempt is given.
The
The synchronizing function will not give a closing command within this time, from when the
synchronizing is started, even if a synchronizing condition is fulfilled. Typical setting is
Synchrocheck settings
OperationSC
The OperationSC setting Off disables the synchronsim check function and sets the outputs
AUTOSYOK, MANSYOK, TSTAUTSY and TSTMANSY to low.
With the setting
conditions.
VDiffSC
Setting for voltage difference between line and bus in p.u. This setting in p.u is defined as
(measured V-Bus/VBase for bus according to
according to
FreqDiffM and FreqDiffA
The frequency difference level settings,
the condition in the network. At steady conditions a low frequency difference setting is needed,
where the
preferable, where the
typical value for the
PhaseDiffM and PhaseDiffA
126
Enabled , the function is in service and the output signal depends on the input
GblBaseSelLine ). A typical value for the voltage difference can be 15%.
FreqDiffM setting is used. For auto-reclosing a bigger frequency difference setting is
FreqDiffA setting is used. A typical value for the FreqDiffM can 10 mHz and a
FreqDiffA can be 100-200 mHz, when the synchronizing function is not used.
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80-150 ms depending on the breaker closing
tMinSynch plus 100 seconds. If the
GblBaseSelBus ) - (measured V-Line/VBase for line
FreqDiffM and FreqDiffA , shall be chosen depending on
1MRK 505 287-UUS B
FreqDiffMin , which will
200 ms.
Busbar protection REB650
Application manual