【Daily Question】Utilities - Mechanical & Electrical - 20190316
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The neutral point of an autotransformer must be grounded in order to prevent （） when a single-phase ground fault occurs in the high-voltage side power grid. A. Overvoltage on the medium-voltage side B. Overvoltage on the high-voltage side C. Overvoltage on both the high-voltage and medium-voltage sides D. Something other than the above three situations Answer: C
C. Overvoltage has occurred on both the high-voltage side and the medium-voltage side