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Power Systems Analysis & Troubleshooting Flashcards

7 cards from real NETA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Power Systems Analysis & Troubleshooting flashcards as text

  1. A voltage unbalance exceeding NEMA's recommended 1% limit on a three-phase induction motor will result in:

    Answer: Increased motor heating and reduced lifespan

    Voltage unbalance causes negative-sequence currents that significantly increase motor heating, reducing insulation life and efficiency.

  2. When performing a ground grid resistance test using the fall-of-potential method, the remote current electrode should be placed at a minimum distance of:

    Answer: At least 5 times the maximum grid dimension

    IEEE 81 recommends the remote current electrode be at least 5 to 10 times the maximum grid dimension to ensure accurate fall-of-potential measurements.

  3. In a distance relay (ANSI 21), the reach setting defines the:

    Answer: Impedance boundary up to which the relay will trip

    The reach of a distance relay is the impedance (and thus the distance along the line) up to which the relay will issue a trip command.

  4. The purpose of the NETA Acceptance Testing Specification (ATS) is to:

    Answer: Establish performance criteria for newly installed electrical equipment

    NETA ATS defines acceptance testing procedures and performance criteria to verify that newly installed electrical equipment meets manufacturer and industry standards.

  5. A sudden pressure relay (ANSI 63) on a transformer trips when it detects:

    Answer: A rapid rise in internal gas or oil pressure due to an internal fault

    The sudden pressure relay responds to a rapid rate-of-rise in internal pressure caused by an arcing internal fault, providing fast transformer protection.

  6. When testing a low-voltage power circuit breaker, the purpose of the long-time delay test is to verify:

    Answer: That the overload element will trip within the manufacturer's time-current curve tolerance

    The long-time delay test verifies that the thermal-magnetic or electronic overload element trips within the tolerance band of the manufacturer's time-current characteristic.

  7. On a power system one-line diagram, a dashed line connecting two buses typically represents:

    Answer: A normally open tie circuit that can be closed to restore service

    A dashed or dotted line on a one-line diagram conventionally represents a normally open tie switch or bus tie that is available for alternate feed.