Voltage Selection - ABB 650 series Applications Manual

1MRK 511 423-UEN A
8.1.2.4
Bay control REC650 2.2 IEC
Application manual
between CB A and CB B is energized (DLLB) from substation 1 via the circuit
breaker A and energization of station 2 is done by CB B energization check device
for that breaker DBLL. (or Both).
UHighBusEnerg > 50 - 120 % of GblBaseSelBus
UHighLineEnerg > 50 - 120 % of GblBaseSelLine
ULowBusEnerg < 10 - 80 % of GblBaseSelBus
ULowLineEnerg < 10 - 80 % of GblBaseSelLine
UMaxEnerg < 50 - 180 % of GblBaseSelBus and/or
GblBaseSelLine
IEC10000078 V4 EN-US
Figure 32: Principle for the energizing check function
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.

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
1
A
B
Bus voltage Line voltage
EnergizingCheck
Section 8
Control
2
IEC10000078-4-en.vsd
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