The winding structure of mine transformers is primarily of the concentric type, utilizing specific forms such as cylindrical, continuous, spiral, and inter-wound types. It features simple structure, reliable insulation, good heat dissipation, and high mechanical strength. Below is a detailed analysis of its core aspects and design considerations:

　　I. Winding Structure Types

　　Mine transformers mainly adopt a concentric structure, where high- and low-voltage windings are concentrically mounted on the core columns. This structure has become the mainstream choice for mine transformers due to its simple manufacturing process and high insulation reliability. Based on winding techniques and performance requirements, concentric windings can be further classified into the following types:

　　1. Cylindrical Windings

　　Characteristics: Made from single or multiple conductors wound into a cylindrical shape, with simple interlayer insulation and good heat dissipation.

　　Applications: Widely used in small-capacity mine transformers, such as those supplying power to lighting and signaling equipment.

　　2. Continuous Windings

　　Characteristics: Composed of multiple segments wound continuously without welded joints between segments, offering high mechanical strength and uniform heat dissipation.

　　Applications: Suitable for medium-capacity mine transformers, such as those powering ventilation and drainage equipment.

　　3. Spiral Windings

　　Characteristics: Windings are arranged in a spiral pattern along the height of the core column, ensuring uniform current distribution and excellent heat dissipation.

　　Applications: Commonly used in large-capacity mine transformers, such as those supplying high-power equipment like hoists and crushers.

　　4. Inter-wound Windings

　　Characteristics: Formed through a special winding process that creates an interwoven structure between segments, enhancing the inter-turn insulation strength and short-circuit resistance.

　　Applications: Applicable to high-voltage, large-capacity mine transformers, such as those used for step-up transformers in mine power grids.

　　II. Winding Design Considerations

　　The design of mine transformer windings must comprehensively consider insulation performance, heat dissipation efficiency, mechanical strength, and environmental adaptability to cope with the complex operating conditions in mines:

　　1. Insulation Performance

　　Interlayer Insulation: Utilizes high-temperature and moisture-resistant insulation materials (such as NOMEX aromatic polyamide insulating paper) to ensure long-term stable operation of windings in high-temperature and high-humidity environments.

　　Inter-turn Insulation: Achieved through reasonable air gap allocation and optimized winding processes to prevent local overheating and insulation aging.

　　2. Heat Dissipation Efficiency

　　Air Duct Design: Reserves air ducts between winding layers to accelerate heat dissipation through air convection and prevent excessive winding temperature rise.

　　Conductor Selection: Uses low-resistance, high-conductivity copper conductors to reduce winding losses and heat generation.

　　3. Mechanical Strength

　　Winding Process: Strictly adheres to process specifications to ensure precise geometric dimensions of windings and avoid mechanical vibrations or deformations caused by manufacturing defects.

　　Fastening Measures: Enhances the integrity of windings through processes such as impregnation and drying to improve resistance to impacts and vibrations.

　　4. Environmental Adaptability

　　Explosion-Proof Design: Mine transformers must meet explosion-proof requirements, and the winding structure must be designed in coordination with explosion-proof enclosures and cable connection boxes to prevent internal faults from causing explosions.

　　Corrosion Resistance: Coats winding surfaces with protective coatings to resist erosion from corrosive gases and dust in mine environments.

　　III. Typical Application Scenarios

　　The selection of winding structures for mine transformers must match specific application scenarios:

　　Small-Capacity Transformers (e.g., powering lighting and signaling equipment): Cylindrical windings are preferred due to their simple structure and low cost.

　　Medium-Capacity Transformers (e.g., powering ventilation and drainage equipment): Continuous windings are selected to balance mechanical strength and heat dissipation performance.

　　Large-Capacity Transformers (e.g., powering hoists and crushers): Spiral or inter-wound windings are adopted to meet high-power and high-voltage requirements.

　　High-Voltage, Large-Capacity Transformers (e.g., step-up transformers for mine power grids): Inter-wound windings significantly enhance inter-turn insulation strength and adapt to high-voltage environments.