Dry-Type Transformer Main Structure & High-Voltage Coil Technical Advantages
Main Structural Design
The dry-type transformer adopts a highly optimized electromagnetic structure and full-range standardized insulating configuration, combining advanced winding technology, precise core lamination process and professional vibration reduction design. This comprehensive structural optimization endows the equipment with excellent mechanical stability, ultra-low noise operation, strong short-circuit withstand capability and long-term operational reliability, fully adapting to long-cycle continuous operation in complex industrial and urban power distribution scenarios. The core structural features are detailed as follows:
Core Structure: The iron core is fabricated with high-quality grain-oriented silicon steel sheets and adopts a step-type 45° full-bevel overlapping joint design. This structure realizes smooth and continuous magnetic flux transmission, effectively eliminating magnetic leakage and local magnetic saturation. It greatly reduces no-load loss, no-load current and magnetostriction vibration noise, significantly improving the overall electromagnetic conversion efficiency and operational stability of the transformer.
Insulation System: The whole machine adopts a full high-strength insulation system. Professional insulating paper and integral molded insulation parts are applied to inter-turn, inter-layer, inter-section gaps and insulating support cylinders. The matched insulation structure realizes uniform electric field distribution without partial high-stress areas, features high dielectric strength, excellent aging resistance and stable insulation performance, and can effectively resist impulse voltage and partial discharge interference.
Low-Voltage Coil: The low-voltage winding adopts an integral foil-type winding structure. Compared with traditional wire-wound coils, the foil structure features extremely uniform current density distribution, effectively avoiding local overheating caused by current concentration. It boasts outstanding axial and radial short-circuit resistance, compact overall structure, small winding gap and high space utilization, ensuring stable output under heavy-load and impact load conditions.
High-Voltage Coil: The high-voltage winding adopts an advanced continuous winding process without intermediate joints. The integral winding structure delivers ultra-high mechanical rigidity and structural uniformity, effectively resisting electromagnetic force impact during short-circuit faults. It features stable electrical performance, uniform voltage distribution and excellent heat dissipation conditions, laying a solid foundation for long-term fault-free operation.
Noise Reduction & Vibration Isolation Design: The transformer body is equipped with multi-level professional isolation and vibration damping measures. Optimized cushioning and fixed clamping structures eliminate operating resonance between the core, windings and housing. The overall structural matching design suppresses electromagnetic vibration and airflow noise, realizing ultra-low noise operation, which is particularly suitable for indoor, residential and urban quiet power supply scenarios.
High-Voltage Coil Technical Advantages
The high-voltage coil adopts an integral continuous winding structure, which completely abandons the segmented splicing design of traditional multi-layer cylindrical coils. It features outstanding overall mechanical strength, uniform internal structure and unobstructed heat dissipation channels. The coil is precisely wound on high-rigidity integral molded insulation cylinders with strong structural stability and deformation resistance. The conductor adopts high-quality flat copper wire with multi-layer insulating paper wrapping, which has good insulation toughness and voltage resistance. All inter-layer and inter-section gaps are filled and buffered with high-performance insulating paper materials to ensure compact and uniform internal structure without hidden air gaps.
The entire high-voltage winding undergoes strict VPI vacuum pressure impregnation and integral curing treatment. Under high vacuum and high-pressure environment, the insulating resin fully penetrates into every gap of the coil, forming an integrated solid insulation structure after curing. This process thoroughly solves the inherent defects of traditional multi-layer cylindrical coils, such as uneven inter-layer voltage distribution, poor heat dissipation efficiency, easy thermal accumulation and thermal breakdown, and weak mechanical resistance to short-circuit impact. It greatly enhances the overall structural rigidity, insulation stability and long-term operational reliability of the winding.
Benefiting from the optimized continuous winding and integral VPI curing process, the high-voltage coil achieves superior comprehensive performance. It has excellent moisture-proof and anti-condensation capabilities, adapting to high-humidity and variable-temperature operating environments. The winding can withstand severe thermal shock and long-term temperature cycle changes without cracking, delaminating or insulation aging. The partial discharge value is strictly controlled below 5 pC, fully meeting ultra-high standards for urban power grids, industrial key projects and international power supply systems. In addition, the insulating materials are environmentally friendly and degradable; they can be easily decomposed, recycled and reused after the equipment service life, complying with global green manufacturing and low-carbon environmental protection development concepts.