ABB Relion 670 Series Applications Manual page 332

Section 15
Control
Synchrocheck settings
OperationSC
OperationSC setting Off disables the synchrocheck function and sets the outputs
The
AUTOSYOK, MANSYOK, TSTAUTSY and TSTMANSY to low. With the setting
in the service mode and the output signal depends on the input conditions.
UHighBusSC and UHighLineSC
The voltage level settings must be chosen in relation to the bus or line network voltage. The
threshold voltages
the breaker is expected to close with the synchronism check. A typical value can be 80% of the
base voltages.
UDiffSC
The setting for voltage difference between line and bus in p.u. This setting in p.u. is defined as
(U-Bus/
FreqDiffM and FreqDiffA
The frequency difference level settings,
on the condition in the network. At steady conditions a low frequency difference setting is
needed, where the
setting is preferable, where the
be10 mHz, and a typical value for
PhaseDiffM and PhaseDiffA
The phase angle difference level settings,
depending on conditions in the network. The phase angle setting must be chosen to allow
closing under maximum load condition. A typical maximum value in heavy-loaded networks can
be 45 degrees, whereas in most networks the maximum occurring angle is below 25 degrees.
PhaseDiffM setting is a limitation to PhaseDiffA setting. Fluctuations occurring at high
The
speed autoreclosing limit
tSCM and tSCA
The purpose of the timer delay settings,
conditions remains constant and that the situation is not due to a temporary interference.
Should the conditions not persist for the specified time, the delay timer is reset and the
procedure is restarted when the conditions are fulfilled again. Circuit breaker closing is thus
not permitted until the synchrocheck situation has remained constant throughout the set
delay setting time. Manual closing is normally under more stable conditions and a longer
operation time delay setting is needed, where the
a shorter operation time delay setting is preferable, where the
value for
Energizingcheck settings
AutoEnerg and ManEnerg
Two different settings can be used for automatic and manual closing of the circuit breaker.
The settings for each of them are:
Off , the energizing function is disabled.
•
DLLB , Dead Line Live Bus, the line voltage is below set value of ULowLineEnerg and the
•
bus voltage is above set value of
• DBLL , Dead Bus Live Line, the bus voltage is below set value of ULowBusEnerg and the line
voltage is above set value of
Both , energizing can be done in both directions, DLLB or DBLL .
•
326
UHighBusSC and UHighLineSC have to be set lower than the value at which
GblBaseSelBus ) - (U-Line/ GblBaseSelLine ). A normal setting is 0,10-0,15 p.u.
FreqDiffM setting is used. For autoreclosing a bigger frequency difference
PhaseDiffA setting.
tSCM can be 1 second and a typical value for tSCA can be 0.1 seconds.
© Copyright 2017 Hitachi Power Grids. All rights reserved
FreqDiffM and FreqDiffA , shall be chosen depending
FreqDiffA setting is used. A typical value for FreqDiffM can
FreqDiffA can be 100-200 mHz.
PhaseDiffM and PhaseDiffA , shall also be chosen
tSCM and tSCA , is to ensure that the synchrocheck
tSCM setting is used. During auto-reclosing,
UHighBusEnerg .
UHighLineEnerg .
1MRK 511 401-UEN Rev. K
On , the function is
tSCA setting is used. A typical
Bay control REC670
Application manual