Why can't the secondary side of the current transformer be opened?
Because the secondary circuit of the current transformer is open, then the secondary current disappears, and the demagnetization effect also disappears, which will cause a high magnetic density in the iron core. And because the number of turns of the secondary side winding is much larger than the number of turns of the primary side winding, once the secondary side is open, there will be a very high voltage, sometimes as high as thousands of volts, so it not only endangers the secondary side equipment, but also seriously affects the human body. Safety.
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