Basler Electric BE1-851 - Manual (Page 31)

SECTION 2 • QUICK START
General
This section provides an overview of the BE1-851 Overcurrent Protection System. You should be familiar
with the concepts behind the user interfaces and BESTlogic™ before you begin reading about the detailed
BE1-851 functions. Sections 3 through 6 describe each function of the BE1-851 in detail.
The following information is intended to provide the reader with a basic understanding of the three user
interfaces (front panel HMI, ASCII serial communications link, and the BE1-851 BESTCOMS™ software)
and the security features provided in the BE1-851 relay. Detailed information on the operation of the HMI
(human-machine interface) can be found in Section 10, Human-Machine Interface, and the ASCII
command communications in Section 11, ASCII Command Interface.
Also covered in this section is an overview of BESTlogic, which is fundamental to how each of the
protection and control functions are set up and used in the BE1-851 relay. Detailed information on using
BESTlogic to design complete protection and control schemes for the protected circuit can be found in
Section 7, BESTlogic, and Section 8, Application.
Sections 3 through 6 describe each function provided in the BE1-851 relay and include references to the
following items. Note that NOT all items are appropriate for each function.
• Human-machine interface (HMI) screens for setting the operational parameters.
• BESTCOMS for setting the operational parameters.
• BESTCOMS for setting up the BESTlogic required for functions in your protection and control
scheme.
• Outputs from the function such as alarm and BESTlogic variables or data reports.
• HMI screens for operation or interrogation of the outputs and reports provided by each function.
• ASCII commands for operation or interrogation of the outputs and reports provided by each
function.
BESTlogic™
Each of the protection and control functions in the BE1-851 is implemented as an independent function
block that is equivalent to a single function, discrete device counterpart. Each independent function block
has all of the inputs and outputs that the discrete component counterpart might have. 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 concept is the same but the method is different in that you choose each function block by enabling it
and use Boolean logic expressions to connect the inputs and outputs. The result is that in designing your
system, you have even greater flexibility than you had using discrete devices. An added benefit is that
you are not constrained by the flexibility limitations inherent in many multifunction relays.
One user programmable, custom logic scheme is in the user settings. To save you time, several
preprogrammed logic schemes are also provided. Any of the preprogrammed schemes can be selected
and used directly without having to make any BESTlogic settings. The logic scheme that is active is
determined by a protection setting. Provisions have also been made to allow the protection engineer to
copy one of the preprogrammed logic schemes into the user programmed custom logic settings so that it
can simply be modified to fine tune it to the user’s requirements.
There are two types of BESTlogic settings: function block logic settings and output logic settings. These
are described briefly in the following paragraphs. Detailed information on using BESTlogic to design
complete protection and control schemes for the protected circuit can be found in Section 7, BESTlogic
Programmable Logic, and Section 8, Application.
Characteristics of Protection and Control Function Blocks
As stated before, each function block is equivalent to a discrete device counterpart. For example, the
recloser function block in the BE1-851 has all of the characteristics of a version of the BE1-79M reclosing
relay with similar functionality. See Figure 2-1.
9289900990 Rev R BE1-851 Quick Start 2-1