ABB Relion 670 Series Applications Manual page 295

1MRK 511 401-UUS F
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
setting is preferable, where the
a typical 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:
Disabled , the energizing function is disabled.
•
DLLB , Dead Line Live Bus, the line voltage is below set value of VDeadLineEnerg and the bus
•
voltage is above set value of
• DBLL , Dead Bus Live Line, the bus voltage is below set value of VDeadBusEnerg and the line
voltage is above set value of
Both , energizing can be done in both directions, DLLB or DBLL .
•
ManEnergDBDL
If the parameter is set to
voltage are below
DBLL or Both .
VLiveBusEnerg and VLiveLineEnerg
The voltage level settings must be chosen in relation to the bus or line network voltage. The
threshold voltages
the network is considered to be energized. A typical value can be 80% of the base voltages.
VDeadBusEnerg and VDeadLineEnerg
The threshold voltages
than the value where the network is considered not to be energized. A typical value can be 40% of
the base voltages.
Because the setting ranges of the threshold voltages
VDeadBusEnerg / VDeadLineEnerg partly overlap each other, the setting conditions may be such
that the setting of the non-energized threshold value is higher than that of the energized
threshold value. The parameters must therefore be set carefully to avoid overlapping.
VMaxEnerg
This setting is used to block the closing when the voltage on the live side is above the set value of
VMaxEnerg .
Bay control REC670
Application manual
tSCM setting is used. During auto-reclosing, a shorter operation time delay
tSCA setting is used. A typical value for tSCM can be 1 second and
tSCA can be 0.1 seconds.
VLIveBusEnerg .
VLiveLineEnerg .
Enabled , manual closing is also enabled when both line voltage and bus
VDeadLineEnerg and VDeadBusEnerg respectively, and ManEnerg is set to DLLB ,
VLiveBusEnerg and VLiveLineEnerg have to be set lower than the value at which
VDeadBusEnerg and VDeadLineEnerg , have to be set to a value greater
A disconnected line can have a considerable potential due to, for instance,
induction from a line running in parallel, or by being fed via the extinguishing
capacitors in the circuit breakers. This voltage can be as high as 30% or more of
the base line voltage.
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VLiveBusEnerg / VLiveLineEnerg and
Section 14
Control
289