ABB Relion REQ650, Руководство по применению

Страница: 193 / 340

~
1 2
A B
EnergizingCheck
Bus voltage
.
U-Bus (live) > 80% of GblBaseSelBus
U-Line (live) > 80% of GblBaseSelLine
U-Bus (dead) < 40% of GblBaseSelBus
U-Line (dead) < 40% of GblBaseSelLine
U-Bus and U-Line < 115% of GblBaseSelBus
and/or GblBaseSelLine
Line voltage
IEC08000022-3-en.vsd
IEC08000022 V3 EN
Figure 81: 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 80% of the base
voltage
UBase , which is defined in the Global Base Value group, according to the
setting of GblBaseSelBus and GblBaseSelLine ; in a similar way, the equipment is
considered non-energized (Dead) if the voltage is below 40% of the base voltage
UBase of the Global Base Value group. 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
synchrocheck 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
1MRK 505 291-UEN A
Section 10
Control
187
Application manual