ABB Relion 650 Series Applications Manual page 124

Section 10
Control
match the set conditions. Figure
other (2) is not energized. Power system 2 is energized (DLLB) from substation 1 via the circuit
breaker A.
~
ANSI11000173 V3 EN-US
Figure 43: 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
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.
10.1.2.4 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 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
118
43 shows two substations, where one (1) is energized and the
1
A
Bus voltage
EnergizingCheck
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
© Copyright 2013 ABB. All rights reserved
2
B
Line voltage
ANSI11000173-3-en.vsd
1MRK 505 287-UUS B
VHighBusEnerg or
M12321-3 v7
Busbar protection REB650
Application manual