9137200997 Rev D BE1-51 Functional Description 3-1
SECTION 3 • FUNCTIONAL DESCRIPTION
GENERAL
BE1-51 Time Overcurrent Relays are microprocessor-based devices that provide protection for the phase
or phase and neutral time and instantaneous overcurrent functions.
BLOCK DIAGRAM ANALYSIS
The following block diagram analysis is referenced to Figure 3-1. A microprocessor (not illustrated in
Figure 3-1) processes signals, performs logic functions, and all of the time overcurrent computations.
Figure 3-1. Functional Block Diagram
Courtesy of NationalSwitchgear.com
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