The transformer core possesses excellent magnetic permeability-its most fundamental physical property and the basis for its voltage-transformation function. Constructed from grain-oriented silicon steel sheets, the core offers magnetic permeability far superior to ordinary steel; it efficiently concentrates magnetic flux lines and channels alternating magnetic flux, thereby significantly enhancing electromagnetic coupling efficiency between the high- and low-voltage windings. With low magnetic reluctance and uniform flux transmission, the core maintains stable magnetic flux under rated operating conditions, minimizing flux dispersion and leakage, which effectively reduces no-load losses. Furthermore, the core exhibits moderate resistance to magnetic saturation; it maintains stable magnetic performance during routine load fluctuations and minor overvoltage events, preventing sudden flux changes or current surges and ensuring a smooth, orderly electromagnetic conversion process.
The core boasts excellent structural stability and mechanical properties, making it suitable for the demanding conditions of long-term, continuous equipment operation. Formed by stacking silicon steel sheets, the core features a compact, rigid structure with high resistance to compression and vibration; it withstands electromagnetic vibrations, load shocks, and external environmental forces without loosening, deforming, or shifting. The core material is uniform and dense, with a balanced ratio of toughness to hardness; it resists defects such as edge curling, cracking, or warping during cutting and stacking, ensuring high dimensional stability. These superior mechanical properties allow the core to maintain its precise structure over the long term, securely anchoring the windings and balancing the overall assembly, which effectively lowers operating noise and the likelihood of mechanical failure.
The core features reliable insulation, heat resistance, and corrosion resistance, making it well-suited for the oil-immersed, high-temperature internal environment of the transformer. Each silicon steel sheet is coated with a specialized insulating layer that ensures effective inter-laminar insulation; this blocks eddy current circulation and prevents short-circuit heating between sheets, drastically reducing eddy current losses. The material exhibits excellent overall high-temperature resistance, maintaining performance without degradation or coating deterioration within the equipment's normal temperature rise range, thereby ensuring exceptional thermal stability. At the same time, the silicon steel sheets of the iron core and their protective coatings exhibit excellent oil and oxidation resistance; they do not easily corrode or degrade through oxidation during prolonged immersion in transformer insulating oil, maintaining stable magnetic and structural properties over the long term and ensuring reliable, safe, and low-loss transformer operation.
