长园科技集团股份有限公司

During transformer operation, the core and clamps may generate a floating potential due to the electromagnetic field. Since the distances between the core and other metal components and the windings are unequal, potential differences exist between these components. When the potential difference between two points is sufficient to break down the insulation between them, intermittent spark discharges occur, which can adversely affect the transformer oil and solid insulation. Therefore, it is necessary to ground the core to the outer shell. If there are two or more grounding points on the core or other metal components, a closed loop will be formed at the grounding points, causing a circulating current, which will cause local overheating of the transformer body, leading to oil decomposition, and then resulting in a decline in insulation performance. In severe cases, the silicon-steel sheets of the core will be burned out, causing a major accident of the main transformer. Therefore, the core of the main transformer must be grounded.