14
1MRS 751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
4. Technical description
4.1. Functional description
4.1.1. Parametrization
To ensure that a protection function block protects the feeder in the desired manner,
the default values of parameters must be checked and set before taking the function
block into use.
The parameters can be set either locally over the HMI or externally via the serial
communication using Relay Setting Tool. See “Serial communication” on page 31.
4.1.1.1. Local parametrization
The parameter to be changed is entered by navigating in the menu structure. For
detailed instructions, see Operator’s Manual (see “Related documents” on page 7).
4.1.1.2. External parametrization
The Relay Setting Tool and/or Graphical I/O Setting Tool is used for external
parametrization of the protection relay. The parameters can be set by using a PC and
downloaded to the protection relay over a communication port. The menu structure
of the setting tool, including views relating to parametrization and settings, is the
same as the menu structure of the protection relay
1
. The use of the tool is instructed
in Tools for Relays and Terminals, User’s Guide (see “Related documents” on
page 7).
1. A few parameters are visible only in the relay, see the list on page 70.
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