Technical data

1MRS751108-MUM
REX 521
9
Protection Relay
Technical Reference Manual, General
1. About this manual
1.1. This manual
This document provides a general description of the protection relay REX 521
Revision G. For more information about the earlier revisions, refer to section
“Revision history of REX 521” on page 63.
For detailed information about the separate functions, see REX 521 Technical
Reference Manual, Standard Configurations (see “Related documents” on page 10).
1.2. Use of symbols
This publication includes the following icons that point out safety-related conditions
or other important information:
Although warning hazards are related to personal injury, it should be understood that
operation of damaged equipment could, under certain operational conditions, result
in degraded process performance leading to personal injury or death. Therefore,
complyfully with all warning and caution notices.
The electrical warning icon indicates the presence of a hazard which
could result in electrical shock.
The caution icon indicates important information or warning related
to the concept discussed in the text. It might indicate the presence of
a hazard which could result in corruption of software or damage to
equipment or property.
The information icon alerts the reader to relevant facts and
conditions.