Function Block - ABB RELION Series Technical Manual

Section 9
Control functions
9.5.2
9.5.3
9.5.4
666

Function block

GUID-AC431FCC-5A14-4767-82B5-77CBD519925B V1 EN
Figure 348: Function block
Functionality
The automatic transfer switch function ATSABTC acts as a back-up in case of
interruption in the active supply path. In the application, voltages are measured on bus
1 and bus 2, while the currents are measured on the common busbar. An undervoltage
on the active bus automatically switches over to the other healthy bus. Automatic
reconnection to the preferred bus is established when the voltage on the preferred bus
has reached a normal level. The preferred main bus can be selected from the settings.
The automatic operation can be selected on/off from a virtual button on the SLD.
Automatic operation ongoing is signalled outside to output INPRO. If the automatic
operations are blocked an alarm is activated on the LED panel.
Operation principle
The Operation setting is used to enable or disable the function. "On" enables the
function and "Off" disables the function.
The operation of ATSABTC can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
1MRS758755 A
REC615 and RER615
Technical Manual