Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
Correct answer: C. constantly the electrical quantities which differ during normal and abnormal conditions
- A. current during abnormal condition
- B. voltage during abnormal condition
- C. constantly the electrical quantities which differ during normal and abnormal conditions
- D. none of the above
Explanation
A protective relay continuously monitors electrical quantities such as current and voltage and responds when their values or relationships depart from normal conditions. This broader description is more accurate than limiting detection to current or voltage alone.
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