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Optional maintenance tests for microprocessor relays

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  1. DetroitLions is offline Junior Member Pro Subscriber
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    Optional maintenance tests for microprocessor relays

    When maintenance testing microprocessor relays, which of the following tests is optional according to NETA/ANSI standards?
    Your Answer: Control verification
    Help: NETA/ANSI Section 7.9.2

    There is not one asterisk next to any of the tests to indicate that any test is optional in NETA/ANSI Section 7.9.2.

    1. Visual and Mechanical Inspection
    1. Record model number, style number, serial number, firmware revision, software revision, and rated control voltage.
    2. Verify operation of light-emitting diodes, display, and targets.
    3. Clean the front panel and remove foreign material from the case.
    4. Check tightness of connections.
    5. Verify that the frame is grounded in accordance with manufacturer’s instructions.
    6. Set the relay in accordance with the coordination study.
    7. Download settings from the relay and compare the settings to those specified in the coordination study or site documentation.
    8. Connect backup battery.
    9. Set clock if not controlled externally.

    2. Electrical Tests
    1. Perform insulation-resistance tests from each circuit to the grounded frame in accordance with manufacturer’s published data.
    2. Apply voltage or current to all analog inputs and verify correct registration of the relay meter functions.

    3. Functional Operation.
    1. Check functional operation of each element used in the protection scheme as described for electromechanical and solid-state relays in 7.9.1.3. When not otherwise specified, use manufacturer’s recommended tolerances.

    4. Control Verification
    1. Functional tests
    1. Check operation of all active digital inputs.
    2. Check all output contacts or SCRs, preferably by operating the controlled device such as circuit breaker, auxiliary relay, or alarm.
    3. Check all internal logic functions used in the protection scheme.
    4. For pilot schemes, perform a loop-back test to check the receive and transmit communication circuits.
    5. For pilot schemes, perform satellite synchronized end-to-end tests.
    6. For pilot schemes with direct transfer trip (DTT), perform transmit and received DTT at each terminal.
    7. Upon completion of testing, reset all min/max recorders, communications statistics, fault counters, sequence of events recorder, and all event records.
    2. In-service monitoring
    After the equipment is initially energized, measure magnitude and phase angle of all inputs and compare to expected values.

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    It is in NETA-MTS 2015. The optional test it is functional test but it is not an optional test in NETA-ATS 2013 fyi
    If you read carefully at the beginning of the question it says: "When maintenance testing..."

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  5. DetroitLions is offline Junior Member Pro Subscriber
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    Duh

    Quote Originally Posted by slts1991 View Post
    It is in NETA-MTS 2015. The optional test it is functional test but it is not an optional test in NETA-ATS 2013 fyi
    If you read carefully at the beginning of the question it says: "When maintenance testing..."
    You are right, I just pulled up the MTS, and functional test is optional.

    *3. Functional Operation

    Check functional operation of each element used in the protection scheme as described for electromechanical and solid-state relays in 7.9.1.3.

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