【Daily Topic】【Electrical Edition 20170508】
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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: When the power grid is operating normally but the three-phase load is unbalanced, the vector sum of the three-phase currents passing through the zero-sequence current transformer of the leakage protector is ( ). A. Equal to zero B. Less than zero C. Greater than zero D. None of the above A
When the power grid is operating normally but the three-phase load is unbalanced, the vector sum of the three-phase currents passing through the zero-sequence current transformer of the leakage protector is (A) A. equal to zero B. less than zero C. greater than zero D. none of the above