ABB RER670 - Energizing Check

12.1.2.3 Energizing check
M12310-3 v12
The main purpose of the energizing check function is to facilitate the controlled re-
connection of disconnected lines and buses to ener
gized buses and lines.
The energizing check function measures the bus and line voltages and compares
them to both high and low threshold values. The output is given only when the
actual measured conditions match the set conditions. Figure
67 shows two
substations, where one (1) is energized and the other (2) is not ener
gized. The line
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).
~
1 2
A
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
Line voltageBus voltage
IEC17000008-1-en.vsdx
B
IEC17000008 V1 EN-US
Figure 67: 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.
1MRK 506 375-UEN A Section 12
Control
Railway application RER670 2.2 IEC 215
Application manual