The primary structural components for securing the iron core-such as clamps, tie plates, and steel binding straps-are essential for maintaining overall compression and structural integrity, thereby ensuring stable operation. Iron clamps are installed at the upper and lower yokes and tightened with bolts to firmly compress the laminations, preventing loosening, misalignment, or the widening of gaps between sheets caused by operational vibrations. Tie plates and binding straps provide comprehensive reinforcement, distributing mechanical stress evenly across the core and preventing lamination loosening or core deformation resulting from prolonged electromagnetic vibration. These components feature high assembly precision and structural strength, effectively minimizing vibration amplitude, reducing operational noise, and maintaining the long-term regularity and stability of the core's magnetic circuit.
A wide range of insulation components is used for the iron core, including insulating blocks, insulating pressboard, insulating sleeves, and interlayer insulation films; these serve to separate the core from metal components and ensure compliance with required insulation clearances. Insulating blocks installed between the core limbs, yokes, and clamps provide isolation, cushioning, and positioning, preventing direct contact between the core and metal structures that could lead to grounding short circuits. Interlayer insulation materials applied to the surface of the silicon steel sheets ensure mutual insulation between individual sheets, eliminating issues such as eddy current circulation and localized overheating. Insulating sleeves and washers used with fastening bolts prevent electrical continuity across multiple points, thereby avoiding circulating currents and associated heating, and ensuring the overall safety and reliability of the core's insulation system.
The iron core is also equipped with grounding and auxiliary protective components, such as grounding strips, grounding sleeves, rubber cushioning pads, and protective baffles. Grounding strips are critical safety components; installed at a single point in accordance with specifications, they discharge floating potential from the core, preventing charge accumulation that could lead to partial discharge or overheating, thus ensuring safe operation. Rubber cushioning pads placed at the interface between the core and the tank dampen vibration and reduce noise, while also preventing structural wear and insulation damage caused by hard metal-to-metal contact. The external protective baffle shields the edges and corners of the iron core, preventing impact damage during assembly and operation; it also blocks the accumulation of oil and impurities, ensuring a cleaner and more stable operating environment for the core and extending its service life.
