13-12
Testing and Maintenance
BE1-951
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 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-TRIGGER and SG-TARG setting commands. Section 6,
Reporting and Alarm Functions,
Fault Reporting Functions, for more details.
Verify Other Set Points as Appropriate
Consult Functional Testing found later in this section for guidelines on testing and verifying set points of
other protection and control functions.
Report and Alarm Functions
Just prior to placing the relay in service, the following reporting and alarm functions should be reset and/or
verified. For details on how to use the optional LCD HMI or the ASCII command interface to enter or edit
relay operating values, see Sections 10 and 11 respectively.
Clock Display
Set the real time clock to the current date and time. If an IRIG input is used, day and time are automatically
synched to the IRIG source, but note that the IRIG time code signal does not contain the current year
information thus necessitating the entry of the year.
Reference Commands: RG-TIME, RG-DATE
Reference HMI Screen: 1.4.6
Refer to Section 6,
Clock, for setting details.
