Basler BE1-951, Инструкция по эксплуатации

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2-2 Quick Start TP1-1021
B L K
51P T
51P P U
M od e =
0-disable
1-enab le
P H A S E
TO C
(51P )
D 2 8 4 9 -1 5
0 6 -1 7 -9 9
Figure 2-1. 51 Time Overcurrent Logic
BESTlogic
Each of the protection and control functions in the BE1-951 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 created by the user may be programmed and saved in
memory. To save you time, several preprogrammed logic schemes have also been provided. Any of the
preprogrammed schemes can be copied into the programmable logic settings without the user having to
make any BESTlogic programming.
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 phase
time-overcurrent function block in the BE1-951 relay has all of the characteristics of a version of the
BE1-51overcurrent relay with similar functionality. Figure 2-1 is a logic drawing showing the inputs and
outputs.
One input:
BLK (block 51P operation)
Two mode settings:
Enable 51P operation
Disable 51P operation
Two outputs:
51PT (51 Phase Trip)
51PPU (51 Phase Pickup)
Four operational settings:
Pickup
Time Delay
Characteristic Curve
Directional
Of the above characteristics, the four operational settings are not included in the logic settings. They are
contained in the protection settings. This is an important distinction. Since changing logic settings is similar
to rewiring a panel, the logic settings are separate and distinct from the operational settings such as pickups
and time delays.
Function Block Logic Settings
To use a protection or control function block, there are two items that need to be set. The mode and the
input logic. The mode is equivalent to deciding which devices you want to install in your protection and
control scheme. You then must set the logic variables that will be connected to the inputs.
For example, the 51N function block has three modes (disabled, 3-Phase summation(3
Io
), and Ground),
and one input, block (torque control). To use this function block, the logic setting command might be
SL-51N=1,/IN2 for Set Logic-51N to be mode 1 (3-Phase and Neutral) with the function blocked when
contact sensing input 2 is not (/) energized. Contact sensing input 2 would be wired to a ground relay enable
switch.
Courtesy of NationalSwitchgear.com