Schweitzer Engineering SEL-351P, Быстрый старт

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13-2 Testing and Troubleshooting Date Code 990215
SEL-351P Manual Técnico
tests should verify that the SEL-351P is properly connected to the power system and all auxiliary
equipment. Verify SEL-351P signal inputs and outputs. Check breaker auxiliary inputs,
SCADA control inputs, and monitoring outputs. Use an ac connection check to verify that the
SEL-351P current and voltage inputs are of the proper magnitude and phase rotation.
Brief fault tests ensure that the SEL-351P settings are correct. It is not necessary to test every
element, timer, and function in these tests.
At commissioning time, use the SEL-351P METER command to verify the ac current and voltage
magnitude and phase rotation. Use the PULSE command to verify SEL-351P output contact
operation. Use the TARGET command to verify optoisolated input operation. The event report
also will report control cable connection between the recloser and the SEL-351-R.
Maintenance Testing
When: At regularly scheduled intervals or when there is an indication of a problem with the
SEL-351P or system.
Goals: a) Ensure that the SEL-351P is measuring ac quantities accurately.
b) Ensure that scheme logic and protection elements are functioning correctly.
c) Ensure that auxiliary equipment is functioning correctly.
What to test: Anything not shown to have operated during an actual fault within the past
maintenance interval.
The SEL-351P uses extensive self-testing capabilities and features detailed metering and event
reporting functions that lower the utility dependence on routine maintenance testing.
Use the SEL-351P reporting functions as maintenance tools. Periodically verify that the control
is making correct and accurate current and voltage measurements by comparing the control
METER output to other meter readings on that line. Review control event reports in detail after
each fault. Using the event report current, voltage, and SEL-351P element data, you can
determine that the SEL-351P protection elements are operating properly. Using the event report
input and output data, you can determine that the control 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.
The basis of this testing philosophy is simple: If the control is set correctly and connected, is
measuring properly, and no self-test has failed, there is no reason to test it further.
Each time a fault occurs, the protection system is tested. Use event report data to determine
areas requiring attention. Slow recloser auxiliary contact operations and increasing or varying
recloser operating time can be detected through detailed analysis of control event reports.