ABB 615 Series - Operation Principle

9.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are “Enable” and “Disable”.
25 has two parallel functionalities, the synchro check and energizing check functionality.
The operation of 25 can be described using a module diagram. All the modules in the
diagram are explained in the next sections.
Energizing
check
Synchro
check
GUID-72E99872-C94E-4B9F-9EF8-C479C8ED8F6B V2 EN
Figure 492: Functional module diagram
If Energizing check is passed, no further conditions need to be fulfilled to permit closing.
Otherwise, Synchro check function can operate either with the V_AB or V_A voltages.
The selection of used voltages is defined with the VT connection setting of the line voltage
general parameters.
By default, voltages V_BUS and V_LINE are connected as presented in
Figure 501. If necessary, connections can be switched by setting Voltage
source switch to “True”.
Energizing check
The Energizing check function checks the energizing direction. Energizing is defined as
a situation where a dead network part is connected to an energized section of the network.
The conditions of the network sections to be controlled by the circuit breaker, that is,
which side has to be live and which side dead, are determined by the setting. A situation
where both sides are dead is possible as well. The actual value for defining the dead line
or bus is given with the Dead bus value and Dead line value settings. Similarly, the actual
values of live line or bus are defined with the Live bus value and Live line value settings.
1MAC059074-MB A Section 9
Control functions
615 series ANSI 977
Technical Manual