Basler Electric BE1-CDS240 Quick Start - Manual (Page 8)

On the field end, the technician simply imports the file into the BESTCOMS database and uploads the file
to the relay where it is stored in nonvolatile memory.
The GUI also has the same preprogrammed logic scheme that is stored in the relay in addition to a library
of additional logic schemes. This gives the engineer the option (off-line) of developing his setting file using
a preprogrammed logic scheme, customizing a preprogrammed logic scheme, or building a scheme from
scratch. Files may be exported from the GUI to a text editor where they can be reviewed or modified. The
modified text file may then be uploaded to the relay. After it is uploaded to the relay, it can be brought into
the GUI, but it cannot be brought directly into the GUI from the text file. The GUI logic builder uses basic
AND/OR gate logic combined with point and click variables to build the logic expressions. This reduces
the design time and increases dependability.
The GUI also allows for downloading industry standard COMTRADE files for analysis of stored
oscillography data. Detailed analysis of the oscillography files may be accomplished using BESTWAVE
software. For more information on Basler Electric's Windows based BESTCOMS (GUI) software, refer to
Section 14, BESTCOMS™ Software.
Getting Started
Connections
Figure 12-25, in Section 12, Installation, shows typical external dc control connections. If your relay has
Power Supply Option 1 or 2, it can be supplied by normal 120 V ac house power. These two power supply
options (1 and 2) are the midrange and high range AC/DC power supplies. The contact sensing inputs are
half-wave rectified opto-isolators. The default contact recognition and debounce settings enable their use
on ac signals as well as dc signals.
Section 12 also shows typical external ac sensing connections. The relay measures the A phase, B
phase, and C phase current magnitudes directly from the three current sensing inputs on Circuit #1 (this
is dependent on style configuration). Circuit #2 measures the A phase, B phase, and C phase current
magnitudes directly from the three current sensing inputs. The neutral and negative-sequence
magnitudes are calculated from the fundamental component of each of the three-phase currents. When
evaluating the negative-sequence functions, the relay can be tested using a two-phase current source. To
fully evaluate the operation of the relay in the power system, it is desirable to use a three-phase current
source.
Connect a computer to the front RS-232 port (refer to Section 12, Installation, for connection diagrams).
Apply power and set the clock using the RG-TIME= and RG-DATE= commands (refer to Appendix C,
Terminal Communication, and Section 11, ASCII Command Interface, for additional information).
Entering Test Settings
Use BESTOMS to enter test settings (see Section 14, BESTCOMS Software, for details) or enter SG (Set
General) to get a listing of the general setting commands with default parameters and put them in a text
file as described previously in Batch Command Text File Operations. Then enter S0 (Setting Group Zero)
to get a listing of the Setting Group 0 protection setting commands with default parameters and put them
in a text file. With these two subgroups of settings, you will not see the global security settings, user
programmable BESTlogic settings, settings for protection Setting Groups 1, 2, and 3, settings for alarm
functions, and the settings for breaker monitoring functions.
Open the SG file in a text editor, change settings as required, and save the changes. For example:
• The ratios for the phase and neutral current transformers (CT2, CTG).
• The demand interval and CT circuit to monitor for the phase, neutral and negative-sequence
currents (DIP, DIN, DIQ).
• The nominal system frequency (FREQ).
• The normal phase-sequence (ABC or ACB) for the system (PHROT).
Open the S0 file in a text editor, change settings, as required, and save the changes. For example:
• The differential taps setting by putting the 87 function in manual and selecting tap values (87).
• The pickup, time dial, and curve for the 51 functions (51P, 51N, 51Q).
While editing this file, it is necessary to set a logic scheme to be active using the SL-N= (Set Protection
LOGIC) command. The default setting is BASIC-87, which means that several protection elements are
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