Hitachi Relion 670 Series Applications Manual page 210

Section 12
Control
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IEC17000008 V1 EN-US
Figure 74:
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
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 ULowBusEnerg or 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.
12.1.2.4 External fuse failure
Either external fuse-failure signals or signals from a tripped 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 two-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 shall be blocked.
The UBOK and UBFF inputs are related to the busbar voltage and the ULNOK and ULNFF 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).
204
1
A
Bus voltage
EnergizingCheck
UHighBusEnerg > 10 - 120 % of GblBaseSelBus
UHighLineEnerg > 10 - 120 % of GblBaseSelLine
ULowBusEnerg < 10 - 80 % of GblBaseSelBus
ULowLineEnerg < 10 - 80 % of GblBaseSelLine
UMaxEnerg < 50 - 180 % of GblBaseSelBus and/or
GblBaseSelLine
Principle for the energizing check function
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2
B
Line voltage
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IEC17000008-1-en.vsdx
M12322-3 v13
M12322-10 v10
Railway application RER670
Application manual