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When a transformer is in operation, the electric field and magnetic field of the windings jointly cause different potentials among the various components of the iron core (including clamps, etc.). If the iron core is not reliably grounded, due to the different potentials, intermittent discharge phenomena may occur, damaging its insulation. On the other hand, if the iron core of the transformer has multiple grounding points, a closed circuit is formed between each pair of grounding points through the iron core itself and the grounding lines. The magnetic flux linked in this circuit will induce a circulating current in the circuit, causing local overheating of the iron core. In severe cases, it can lead to local burnout, seriously threatening the safe operation of the transformer.