ABB Relion 670 Series Applications Manual page 323

1MRK 511 401-UEN Rev. K
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
UHighBusEnerg or UHighLineEnerg of the base voltages GblBaseSelBus and GblBaseSelLine ,
which are defined in the Global Base Value groups; in a similar way, the equipment is
considered non-energized (Dead) if the voltage is below the set value for
ULowLineEnerg 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.
15.1.2.4 Voltage selection
The voltage selection function is used for the connection of appropriate voltages to the
synchrocheck, 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 synchronizing, synchrocheck and energizing check
functions can be selected.
Available voltage selection types are for single circuit breaker with double busbars and the 1½
circuit breaker 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 1½ circuit breaker 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 functions available in the
IED.
15.1.2.5 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 BLKU,
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 function is blocked.
The UB1OK/UB2OK and UB1FF/UB2FF inputs are related to the busbar voltage and the
ULN1OK/ULN2OK and ULN1FF/ULN2FF 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 HMI, through selector switch function block, but alternatively
there can for example, be a physical selector switch on the front of the panel which is
connected to a binary to integer function block (B16I).
Bay control REC670
Application manual
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Section 15
Control
ULowBusEnerg or
M12321-3 v11
M12322-3 v13
M12322-10 v8
317