12.2
SEL-734 Meter Instruction Manual Date Code 20090730
Testing and Troubleshooting
Testing Philosophy
Commissioning
Testing
When: Installing a new metering system.
Goals:
1. Ensure that all system ac and dc connections are correct.
2. Ensure that the meter functions as intended with your settings.
3. Ensure that all auxiliary equipment operates as intended.
What to Test: All connected or monitored inputs and outputs, polarity and
phase rotation of ac connections.
SEL performs a complete functional check and calibration of each meter
before it is shipped. This helps ensure that you receive a meter that operates
correctly and accurately. Commissioning tests should verify that the meter is
properly connected to the power system and all auxiliary equipment. Verify
control signal inputs and outputs. Check SCADA control inputs and
monitoring outputs. Use an ac connection check to verify that the meter
current and voltage inputs are of the proper magnitude and phase rotation.
At commissioning time, use the METER command to verify the ac current
and voltage magnitude and phase rotation. Use the PULSE command to
verify meter output contact operation. Use the TARGET command to verify
optoisolated input operation.
Maintenance Testing
When: At regularly scheduled intervals or when there is an indication of a
problem with the meter or system.
Goals:
1. Ensure that the meter is measuring ac quantities accurately.
2. Ensure that scheme logic is functioning correctly.
3. Ensure that auxiliary equipment is functioning correctly.
What to Test: Anything not shown to have operated correctly within the
past maintenance interval.
SEL meters use extensive self-testing capabilities and feature detailed
metering and event reporting functions that lower the dependence on routine
maintenance testing.
Use the SEL meter reporting functions as maintenance tools. Periodically
verify that the meter is making correct and accurate current and voltage
measurements by comparing the meter output to other meter readings on that
line. Using the event report current, voltage, and meter element data, you can
determine that the meter elements are operating properly. Using the event
report input and output data, you can determine that the meter is asserting
outputs at the correct instants and that auxiliary equipment is operating
properly. At the end of your maintenance interval, the only items that need
testing are those that have not operated during the maintenance interval.
Courtesy of NationalSwitchgear.com
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