Why do transformers need to be subjected to the impact closing test before putting in the investment?

In order to verify whether the transformer insulation strength can withstand voltage or operating overvoltage during operation, it is necessary to perform several impact closing tests when the transformer is put into operation. In addition, when the no-load transformer is put into the power grid, the magnetizing inrush current will be generated, and after 0.5~1s, it will be reduced to 0.25~0.5 times of the rated current. Since the magnetizing inrush current generates a large amount of power, in the impact closing test, the mechanical strength of the transformer and the reliability of the relay protection action are tested.

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