BE1-851E
FUNCTIONAL DESCRIPTION
The BE1-851E is a multifunction, numeric relay that
provides a comprehensive mix of protective, control
and metering functions in an integrated system. This
system is suitable for any nondirectional overcurrent
application including feeder applications, generator
applications, cogeneration applications, and trans-
former backup.
The BE1-851E has the unique ability to provide specific
current response characteristics. It does this in three
different ways:
• The Fundamental twenty-four sample per cycle
Digital Signal Processing (DSP) algorithm provides
rejection of harmonics and low transient overreach.
• The RMS DSP algorithm provides true wide band
RMS measurement.
• The Average DSP algorithm provides a flat
response characteristic over a wide frequency
range.
These characteristics are independently settable for
phase and neutral quantities.
The unit has one set of three phase and neutral current
sensing inputs to provide all common protective
functions for substation and feeder applications.
The half rack case is fully drawout with current circuit
shorting provisions. Two Basler Electric half rack IEDs
(Intelligent Electronic Devices) such as primary and
backup BE1-851E or the BE1-951 or BE1-GPS100 can
be dovetailed together to mount in a standard 19"
equipment rack with no special mounting hardware.
Three independent communications ports, along with
built-in support for Modbus
™
and other common
protocols, provide easy access to integrating the
protection, control, metering, and status monitoring
functions into a substation automation system. The
standard IRIG-B port provides time synchronization
from a master clock.
Real time metering provides amp and unbalance
loading telemetry for the protected circuit. Contact
sensing inputs and alarm monitoring functions provide
real time status information. Remote control is provided
by virtual control and selector switches with select-
before-operate control of programmable outputs.
BESTlogic
BESTlogic programmable logic provides the user with
high flexibility in configuring a protection and control
system.
Each of the protection and control functions in the
BE1-851E is implemented as an independent function
block that is equivalent to its single function, discrete
device counterpart. Each independent function block
has all the inputs and outputs that the discrete
component counterpart might have. Figure 6 shows
each of the independent function blocks available for
use in the BE1-851E. Programming BESTlogic is
equivalent to choosing the devices required by your
protection and control scheme and drawing schematic
diagrams to connect the inputs and outputs to obtain
the desired operational logic.
The BE1-851E relay can store, as user settings, one
user programmable, custom logic scheme. To save
you time, several preprogrammed logic schemes have
also been provided. Any of the preprogrammed
schemes may be copied into the logic settings without
making any additional BESTlogic settings.
BESTlogic provides the protection engineer with the
flexibility to set up this powerful multifunction system
with the same freedom that was once enjoyed with
single function, discrete devices. It is no longer neces-
sary to compromise your standard protection and
operating practices to deal with the limitations in
programmability of previous multifunction devices.
Figures 2A, 2B, 2C, and 3 show typical external
connections, and Figure 5 shows rear panel connec-
tions.
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