ABB REQ650 User Manual

Note! The FreqDiffMin shall be set to the same value as FreqDiffM
respective FreqDiffA for SESRSYN irrespective of whether the
functions are used for manual operation, autoreclosing or both.
FreqDiffMax
The setting FreqDiffMax is the maximum slip frequency at which synchronizing is
accepted. 1/FreqDiffMax shows the time for the vector to move 360 degrees, one turn
on the synchronoscope and is called the Beat time A typical value for the FreqDiffMax
is 200-250 mHz which 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
The tBreaker shall be set to match the closing time for the circuit breaker and should
also 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
Setting for the duration of the breaker close pulse.
tMaxSynch
The tMaxSynch is set to reset the operation of the synchronizing function if the
operation does not take place within this time. The setting must allow for the setting of
FreqDiffMin, which will 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 tMinSynch plus 100 seconds. If the network frequencies are
expected to be outside the limits from start a margin needs to be added. Typical setting
600 seconds.
tMinSynch
The tMinSynch is set to limit the minimum time at which synchronizing closing
attempt is given. 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 200 ms.
Synchrocheck settings
OperationSC
The OperationSC setting Off disables the synchrocheck function and sets the outputs
AUTOSYOK, MANSYOK, TSTAUTSY and TSTMANSY to low.
1MRK 505 291-UEN A Section 10
Control
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Application manual

ABB REQ650 Specifications

General

Brand	ABB
Model	REQ650
Category	Protection Device
Language	English