ABB Relion 670 Series Applications Manual page 273

1MRK 505 370-UUS Rev. K
The energizing operation can operate in the dead line live bus (DLLB) direction, dead bus live line
(DBLL) direction, or in both directions over the circuit breaker. Energizing from different directions can be
different for automatic reclosing and manual closing of the circuit breaker. For manual closing it is also
possible to allow closing when both sides of the breaker are dead, Dead Bus Dead Line (DBDL).
The equipment is considered energized (Live) if the voltage is above the set value for VLiveBusEnerg or
VLiveLineEnerg of the base voltages GblBaseSelBus and VGblBaseSelLine, which are defined in the
Global Base Value groups, according to the setting of GblBaseSelBus and GblBaseSelLine; in a similar
way, the equipment is considered non-energized (Dead) if the voltage is below the set value for
VDeadBusEnerg or VDeadLineEnerg of the respective Global Base Value groups. A disconnected line
can have a considerable potential due to factors such as induction from a line running in parallel, or
feeding via extinguishing capacitors in the circuit breakers. This voltage can be as high as 50% or more
of the base voltage of the line. Normally, for breakers with single breaking elements (<330 kV) the level is
well below 30%.
When the energizing direction corresponds to the settings, the situation has to remain constant for a
certain period of time before the close signal is permitted. The purpose of the delayed operate time is to
ensure that the dead side remains de-energized and that the condition is not due to temporary
interference.
12.1.2.4 Voltage selection
The voltage selection function is used for the connection of appropriate voltages to the synchronism
check, synchronizing and energizing check functions. For example, when the IED is used in a double bus
arrangement, the voltage that should be selected depends on the status of the breakers and/or
disconnectors. By checking the status of the disconnectors auxiliary contacts, the right voltages for the
synchronism check and energizing check functions can be selected.
Available voltage selection types are for single circuit breaker with double busbars and the breaker-and-
a-half arrangement. A double circuit breaker arrangement and single circuit breaker with a single busbar
do not need any voltage selection function. Neither does a single circuit breaker with double busbars
using external voltage selection need any internal voltage selection.
Manual energization of a completely open diameter in breaker-and-a-half switchgear is allowed by
internal logic.
The voltages from busbars and lines must be physically connected to the voltage inputs in the IED and
connected, using the PCM software, to each of the SESRSYN (25) functions available in the IED.
12.1.2.5 External fuse failure
Either external fuse failure signals or signals from a tripped fuse (or miniature circuit breaker) are
connected to HW binary inputs of the IED; these signals are connected to inputs of SESRSYN function in
the application configuration tool of PCM600. The internal fuse failure supervision function can also be
used if a three phase voltage is present. The signal BLKV, from the internal fuse failure supervision
function, is then used and connected to the fuse supervision inputs of the SESRSYN function block. In
case of a fuse failure, the SESRSYN energizing (25) function is blocked.
The VB1OK/VB2OK and VB1FF/VB2FF inputs are related to the busbar voltage and the VL1OK/VL2OK
and VL1FF/VL2FF inputs are related to the line voltage.
External selection of energizing direction
The energizing can be selected by use of the available logic function blocks. Below is an example where
the choice of mode is done from a symbol ,created in the Graphical Design Editor (GDE) tool on the local
Busbar protection REB670
Application manual
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Section 12
Control
M12321-3 v11
M12322-3 v13
M12322-10 v9
267