• ETT Level 4.13: Electrical Protective Devices

    Learn how to perform applicable tests to determine functions and characteristics of motor management systems, generation relays, and transmission relays.

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    1. Motor Management Systems - Confirm and/or apply settings provided by others. Perform applicable tests to determine functions and characteristics of each operating element and expected reaction; evaluate the results. Relays can include but are not limited to negative sequence, loss of excitation, synchronization, thermal model.
    2. Generation relays - Confirm and/or apply settings provided by others. Perform applicable tests to determine functions and characteristics of each operating element and expected reaction; evaluate the results. Relays can include but are not limited to negative sequence, loss of excitation, synchronization, and overspeed.
      • 64S Protection Guide [PDF] This paper covers the Theory, Application, and Commissioning of Generator 100 Percent Stator Ground Fault Protection Using Low Frequency Injection.
    3. Transmission relays - Confirm and/or apply settings provided by others. Perform applicable tests to determine functions and characteristics of each operating element and expected reaction; evaluate the results. Relay functions can include but are not limited to phase- and ground-overcurrent, distance, phase comparison, current differential, reclosing, and breaker failure.
    4. Advanced knowledge and skills - Perform dynamic relay testing; evaluate relay operations. Perform end-to-end testing of communications assisted relay schemes with GPS controlled test equipment.

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