ABB RELION Series Technical Manual page 673

1MRS758755 A
REC615 and RER615
Technical Manual
GUID-DC05B076-D955-4E7B-BFA0-29084B07C2D0 V1 EN
Figure 349: Functional module diagram
All inputs and outputs for the ATSABTC function block are binary signals. Voltage
presence indication at each bus is connected to inputs UN_U_BUS1 and
UN_U_BUS2, where a binary TRUE represents under-voltage on bus. Fault on the
busbar (earth fault or overcurrent) is connected to the input BLOCK.
Bus fault check
Under-voltage on respective bus is detected with UN_U_BUS1 and UN_U_BUS2.
Input BLOCK also indicates common bus fault, but furthermore blocks the automatic
operation in the control logic modules.
GUID-7C91B8EF-277B-4074-B3A2-C646584CF5C8 V1 EN
Figure 350: Sub module diagram for Bus fault check
Control logic
Depending on the Main bus priority setting, the control logic reads the states of the
circuit breakers and performs automatic transfers depending on bus voltage presence
and blocking conditions. In control logic sub module diagrams, all the open/close
situations in automatic mode are illustrated.
Section 9
Control functions
667