ABB RELION 620 Series Technical Manual page 584

Section 6
Supervision functions
6.2
6.2.1
6.2.2
6.2.3
6.2.4
578
Trip circuit supervision TCM
Identification
Function description
Trip circuit supervision
Function block
A070788-ANSI V1 EN
Figure 289: Function block
Functionality
The trip circuit supervision function TCM is designed for supervision of control circuits.
A fault in a control circuit is detected by using a dedicated output contact that contains the
monitoring functionality. The failure of a circuit is reported to the corresponding function
block in the relay configuration.
The function picks up and trips when TCM detects a trip circuit failure. The trip time
characteristic for the function is of the definite time (DT) type. The function trips after a
predefined operating time and resets when the fault disappears.
The function contains a blocking functionality. Blocking deactivates the ALARM output
and resets the timer.
Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
The operation of trip circuit supervision can be described by using a module diagram. All
the modules in the diagram are explained in the next sections.
IEC 61850 IEC 60617
identification identification
TCSSCBR TCS
1MAC504801-IB E
ANSI/IEEE C37.2
device number
TCM
620 series ANSI
Technical Manual