10-42
Testing and Troubleshooting
Date Code 20020129
SEL-387E Instruction Manual
Step 26.
Purpose: Verify
the
24CR
setting.
Method: Apply balanced three-phase voltages as shown in Figure 10.5. Change the
voltage to a value above the
24D2P1
setting for an elapsed time of
24D2D2/
2 seconds, then change the voltage to a value below the
24D2P1
setting. The
24CR
front-panel LED should illuminate after
24CR
/2
seconds, within ±0.1% of setting ±4.2 ms (at 60 Hz).
Time-Code Input (IRIG-B)
Purpose: Verify operation of the IRIG-B clock input for Serial Port 2 and the connector of
Serial Port 1.
Method: 1. Connect a source of demodulated IRIG-B time code to the relay Serial Port 2
(pins 4 and 6) in series with a resistor to monitor the current. Adjust the source to
obtain an “ON” current of about 10 mA.
2.
Execute
the
IRIG
command. Make sure the relay clock displays the correct date
and time.
3. Optional. Connect the demodulated IRIG-B time code to the relay as in Step 1,
but through the Serial Port 1 connector (pins 7 and 8).
C
OMMISSIONING
T
ESTING
When:
When installing a new protection system.
Goal:
a)
Ensure that all system ac and dc connections are correct.
b) Ensure that the relay functions as intended using your settings.
c)
Ensure that all auxiliary equipment operates as intended.
What to test: All connected or monitored inputs and outputs; polarity and phase rotation of ac
current connections; simple check of protection elements.
SEL performs a complete functional check and calibration of each relay before it is shipped.
This helps ensure that you receive a relay that operates correctly and accurately. Commissioning
tests should verify that the relay is properly connected to the power system and all auxiliary
equipment. Verify control signal inputs and outputs. Check breaker auxiliary inputs, SCADA
control inputs, and monitoring outputs. Use an ac connection check to verify that the relay
current inputs are of the proper magnitude and phase rotation.
Brief fault tests ensure that the relay settings are correct. It is not necessary to test every relay
element, timer, and function in these tests.
At commissioning time, use the relay
METER DIF
command to record the measured operate
and restraint values for through-load currents. Use the
PULSE
command to verify relay output
contact operation.
Содержание SEL-387E
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