Basler Electric BE1-851 - Manual (Page 21)

BESTCOMS™ Software
BESTCOMS is a Windows® based graphical user interface (GUI) that runs on IBM-compatible computers.
The software is used to create settings files for protection, control, operating logic, breaker monitoring,
metering, and fault recording functionality. A primary advantage to BESTCOMS is that these setting files
may be created while off line (not connected to a unit). This feature gives the engineer flexibility in
developing, testing, and replicating the settings before exporting them to a file and transmitting the file to
technical personnel in the field.
The BESTCOMS GUI also includes the same preprogrammed logic schemes that are contained in the
relay. This allows engineers the flexibility of developing setting files using a preprogrammed logic
scheme, customizing a preprogrammed logic scheme or building a scheme from scratch. Logic schemes
are developed using the GUI Logic Builder. The logic builder uses basic Boolean and/or constructs to
develop logic schemes.
Primary Applications
The BE1-851 Overcurrent Protection System provides complete circuit protection with multiple
overcurrent elements and is intended for use in any non-directional overcurrent application. Its unique
capabilities make it ideally suited for applications where:
• Low burden is required to extend the linear range of CTs.
• One relay provides the flexibility of wide settings ranges, multiple settings groups, and multiple
coordination curves.
• A multifunction, multi-phase relay is desired for economical and space saving benefits. A single
BE1-851 provides all of the protection, local and remote indication, metering, and control required
on a typical circuit.
• Communication capability and protocol support is desired.
• Applications that require specific current response characteristics.
o The fundamental digital signal-processing (DSP) algorithm provides rejection of
harmonics and low transient overreach.
o The RMS DSP algorithm provides true wide band RMS measurement.
o The average DSP algorithm provides a flat response characteristic over a wide frequency
range.
• Bus protection is provided by a high-speed overcurrent-blocking scheme on the transformer bus
mains instead of a bus differential circuit.
• The capabilities of intelligent electronic devices (IEDs) are used to decrease relay and equipment
maintenance costs.
• Applications where the optional case configurations facilitate retrofit in existing substations. One
electromechanical overcurrent or reclosing relay can be replaced by a BE1-851 relay. The
remaining relays can be removed or left in service as backup.
• Applications where the capabilities of a digital multifunction relay are required yet test paddles
and/or drawout construction is also required.
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