13-10 BE1-951 Testing and Maintenance 9328900990 Rev L
Line and Bus Angle, Frequency, and Slip Verification
Step 1: Connect relay Terminals C13 (polarity) and C16 (A to Neutral of the three-phase voltage input)
to a 60 hertz ac voltage source (line voltage).
Step 2: Connect relay Terminals C17 (polarity) and C18 (Auxiliary Voltage Input) to a second 60 hertz
ac voltage source (bus voltage).
Step 3: Apply 115 volts at 0 degrees and 60 hertz to both sources. Verify the measuring accuracy of the
line and bus frequency, angle between the two voltages, and slip frequency by transmitting the
M command to the relay. HMI Screens 3.10 and 3.11 can also be monitored to verify the
measurements.
Step 4: Vary the angle of the line voltage and verify the measured angle as in Step 3. Polarity of the
angle measurement is relative to the angle of the line voltage. That is, if the line voltage lags the
bus voltage by 30 degrees, the sign of the angle will be negative or -30 degrees. When the line
voltage leads, the angle has no sign and is assumed to be positive.
Step 5: Return the line voltage angle to 0 degrees. Vary the frequency of the line voltage and verify the
measured slip as in Step 3. (Note that the angle shown on HMI Screen 3.11 is continuously
changing as a result of slip between the two systems. This is normal). Polarity of the slip
frequency is relative to the frequency of the line. That is, if the line frequency is 58 hertz and the
bus frequency is 60 hertz, the slip frequency is -2. As soon as the line frequency rises above 60
hertz, slip frequency has no sign and is assumed to be positive.
COMMISSIONING TESTING
Because the commissioning of this relay may be a new installation or a retrofit, special precautions
should be taken to ensure that all tests are performed with safety as the greatest concern. Any CT circuit
signals that are routed through this device as part of a protection scheme including discrete relays or as a
stand-alone device should be shorted and isolated from this relay during these tests until the final
instrument transformer current circuit check.
If this relay is being installed in an existing installation, please be aware of the equipment monitoring
features of this device, especially if the monitoring logic will be utilized. Please make note of any pretest
operation levels, duty levels, etc. on existing equipment (e.g., breakers or transformers). As the user, you
may make the determination of what values the relay should have as initial monitoring values when the
relay is placed in service.
Also, please be aware that because of the multi-function nature of the BE1-951 relay, it may on occasion
be necessary to temporarily disable some of the protective elements while testing the relay to facilitate
isolated testing of individual functions. Always remember to enable these functions before placing the
relay in service.
To assist you in the commissioning testing of this relay, you may at any time refer to Section 6, Reporting
and Alarm Functions, for various means of reporting status, alarms, and targets.
Please refer to the other sections of the instruction manual for assistance on any particular functions of
the relay. If you require further assistance, contact Basler Electric field application personnel or the
factory.
Digital I/O Connection Verification
Contact Sensing Inputs
Purpose: To verify contact sensing input label assignments and recognition and debounce settings.
Reference Commands: SN-IN, SG-IN
Step 1: Transmit the SN-IN1 command to verify the input 1 user-defined name, TRUE label, and FALSE
label.
Step 2: Repeat Step 1 for each of the remaining contact sensing inputs. Add the number of an input to
the SN-IN command to check that input's name and labels.
Step 3: Verify the recognition and debounce settings for each contact sensing input by using the SG-IN
command. When the SG-IN command is transmitted, the relay responds with the recognition
and debounce settings for each input. Reported settings use the format SG-IN#=recognition,
debounce.
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