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【单选题】
Transformers with different connection groups cannot operate in parallel because ().
A.
Voltage change rate is too large;
B.
The no-load circulation is too large;
C.
The excitation current at load is too large;
D.
The transformer ratio is different with different connection group numbers.
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B.
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C.
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D.
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A.
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B.
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C.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
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A.
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B.
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C.
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