Voltage Selection - ABB REC650 Applications Manual

1MRK 511 286-UUS A
10.1.2.4
Application manual
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V-Bus (live) > 80% of GblBaseSelBus
V-Line (live) > 80% of GblBaseSelLine
V-Bus (dead) < 40% of GblBaseSelBus
V-Line (dead) < 40% of GblBaseSelLine
V-Bus and V-Line < 115% of GblBaseSelBus
and/or GblBaseSelLine
ANSI11000173 V3 EN
Figure 71: 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 if the voltage is above set value of
VHighBusEnerg or VHighLineEnerg of the base voltage, and non-energized if it is below
set value of VLowBusEnerg or VLowLineEnerg of the base voltage. A disconnected line
can have a considerable potential because of 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
synchronism check 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
1
A
B
Bus voltage Line voltage
EnergizingCheck
Section 10
Control
2
ANSI11000173-3-en.vsd
187