13-12 BE1-951 Testing and Maintenance 9328900990 Rev L
Virtual Control Switch (If not used, skip to Protection and Control Function Verification)
Purpose: To verify the operation, label, and logic setting for the 101 Switch.
Reference Commands: SB-LOGIC, SL-101, RG-STAT, CS/CO-101
Step 1: Verify the breaker label and breaker-closed logic expression with the SB-LOGIC command.
Step 2: Use the SL-101 command to read the logic mode of the 101 Switch. The switch is either
enabled (1) or disabled (0).
Step 3: Obtain the virtual control switch status by using the RG-STAT command.
Step 4: Transmit the command ACCESS= to obtain write access to the relay. Change the switch
position by entering CS-101=T (Trip) or C (Close) followed by CO-101=T (Trip) or C (Close).
The syntax of the CS-101 and CO-101 commands must match or the CO-101 command won't
be executed.
Step 5: Confirm the switch position change with the RG-STAT command.
Step 6: Repeat Step 4 to return the 101 Switch to the desired position for your application.
Step 7: Verify the 101 Switch activities by viewing the sequence of events reports with the RS-###
command.
Protection and Control Function Verification
Before placing the relay in service, the user should ensure that all system ac and dc connections are
correct, that the relay functions as intended with user settings applied and that all equipment external to
the relay operates as intended. All connected or monitored inputs and outputs, and polarity and phase
rotation of ac connections should be tested. Verify that:
• Power supply and contact wetting voltages are correct.
• User desired protection and control functions are enabled and connected to the correct CT and
VT input circuits.
• The programmable logic settings (electronic wiring) provide the proper interconnection of these
functions with the I/O of the relay.
• Each protection function has the desired operational set points.
Simple user designed fault tests should be used to verify that the operational settings are correct, that the
proper output relays are actuated and proper targeting occurs. (Refer to Figure 13-1 or 13-2 for terminal
locations.) It is not necessary to test every protection element, timer, and function in these tests.
Use of the fault and event recording capability of the relay will aid in the verification of the protection and
control logic. Transmit the RS command to retrieve all SER records or RS-n to get a specific operation.
Also, it is helpful to transmit RS-NEW=0 prior to starting a test. This allows the user to review only those
operations recorded since the last RS-NEW was initiated. Replace the S with F and use the same
commands for Fault records. Refer to Section 6, Reporting and Alarm Functions, for more detail.
Please be aware that because of the multi-function nature of the BE1-951 relay, it may be necessary to
disable protection elements or change setting logic to verify a specific function. To guard against placing
the relay in service with unwanted operational or logic settings, it is good practice to save a copy of the
original setting file before the testing process begins. When testing is complete, compare the copy of the
saved settings to the actual relay settings as a final verification.
To accomplish this, transmit the S command to the relay. This command generates all logic and
operational settings that are on the relay. Copy the data to a text editor such as Notepad and print it out.
This along with the user's logic diagram provides a complete picture of the relay's protection and control
capability. The logic and operational settings of the protection and control functions should be examined
to determine:
• The mode setting for the function so that you know what the relay is supposed to do.
• Which virtual output logic expressions contain the logic variables that represent the output
contacts for protection function being tested.
• The input logic expressions for the function under test (especially the block input because it
renders the function disabled if the block input is asserted).
• That the operational pickup and dropout threshold values and time delays agree with the users
calculated values.
• That the fault reporting settings are set so the relay properly indicates pickup and trip states and
records targets. These settings are set from the ASCII command interface using the SG-
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