REM 543 Protection,
Monitoring and Control
Page 11
Technical Reference Manual
Part 1, General
ABB Network Partner
4.
Technical Description
4.1.
Functional description
4.1.1.
Functions of the machine terminal
The functions of the REM 543 machine terminal are categorized as:
•
protection functions
•
measurement functions
•
control functions
•
condition monitoring functions
•
communication functions
•
standard functions
4.1.1.1.
Libraries
The function blocks available for the REM 543 machine terminal are grouped into
application-specific libraries. There are libraries available for each function category,
e.g. protection libraries, measurement libraries and control libraries. One machine ter-
minal can be purchased with one library of each kind.
Please consult your relay supplier for further information regarding libraries available
for the REM 543 machine terminals.
4.1.1.2.
Protection functions
Protection is one of the most important functions of the REM 543 machine terminal.
The protection function blocks (e.g. NOC3Low) are independent of each other and have
their own setting groups, data recording, etc. As an example, the non-directional over-
current protection includes the three stages NOC3Low, NOC3High and NOC3Inst, each
with independent protection functions.
Either Rogowski coils or conventional current transformers can be used for protection
functions based on current measurement (overcurrent). Correspondingly, either voltage
dividers or voltage transformers are used for protection functions based on voltage
measurement (overvoltage).
The protection function blocks are documented on the CD-ROM “Technical Descrip-
tions of Functions” (1MRS750889-MCD).