ABB REB670 Series, Applications Manual

Page: 269 / 476

•
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
UHighBusEnerg.
•
DBLL, Dead Bus Live Line, the bus voltage is below set value of ULowBusEnerg and the line
voltage is above set value of UHighLineEnerg.
• Both, energizing can be done in both directions, DLLB or DBLL.
ManEnergDBDL
If the parameter is set to
On, manual closing is also enabled when both line voltage and bus
voltage are below
ULowLineEnerg and ULowBusEnerg respectively, and ManEnerg is set to
DLLB, DBLL or Both.
UHighBusEnerg and UHighLineEnerg
The voltage level settings must be chosen in relation to the bus or line network voltage. The
threshold voltages
UHighBusEnerg and UHighLineEnerg have to be set lower than the value at
which the network is considered to be energized. A typical value can be 80% of the base
voltages.
ULowBusEnerg and ULowLineEnerg
The threshold voltages
ULowBusEnerg and ULowLineEnerg, have to be set to a value greater
than the value where the network is considered not to be energized. A typical value can be 40%
of the base voltages.
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.
Because the setting ranges of the threshold voltages
UHighBusEnerg/UHighLineEnerg and
ULowBusEnerg/ULowLineEnerg 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.
UMaxEnerg
This setting is used to block the closing when the voltage on the live side is above the set value
of
UMaxEnerg.
tAutoEnerg and tManEnerg
The purpose of the timer delay settings,
tAutoEnerg and tManEnerg, is to ensure that the dead
side remains de-energized and that the condition 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 energizing condition has remained constant throughout the set delay
setting time.
12.2 Autorecloser for 1 phase, 2 phase and/or 3 phase
operation SMBRREC
IP14559-1 v6
1MRK 505 370-UEN D Section 12
Control
Busbar protection REB670 263
Application manual