Technical data

1MRS751108-MUM

REX 521

Protection Relay

Technical Reference Manual, General

5. Technical description

5.1. Functional description

5.1.1. 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 36.

5.1.1.1. 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 10).

5.1.1.2. 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 parametrization and settings views, is the same as the

menu structure of the protection relay

. The use of the tool is instructed in Tools for

Relays and Terminals, User’s Guide (see “Related documents” on page 10).

A051898

Fig. 5.1.1.2.-1 Main dialog box of the Relay Setting Tool

1. Some parameters are visible only in the relay, see the list on page 73.