Dry-type power transformer

Abstract

This invention provides a dry-type power transformer, including a transformer casing, an integrated stress-balanced load-bearing upper frame and a low-voltage integrated quick-connect energy output module, and a high-voltage insulation coupling access module and a load-responsive high-voltage tap changer assembly on the side. Internally, it houses a transformer assembly composed of a laminated nanocrystalline iron core, foil-type low-voltage winding coils, and a high-voltage epoxy-cast coil, all insulated and protected by a nano-composite epoxy resin encapsulation. A multi-layered metal-insulated composite high-frequency eddy current suppression shield is installed around the outer periphery of the casing, and below it are arrayed ceramic heat dissipation inserts, multi-dimensional stress-buffered insulating pads, and an electromagnetic compatibility shielded grounding busbar. This transformer reduces iron losses through its nanocrystalline iron core, adapts to load fluctuations through its dynamic tap changer structure, and enhances operational stability through multiple insulation shields. It exhibits high-efficiency heat dissipation and stress resistance, effectively improving operational efficiency and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of transformers, and more specifically, to a dry-type power transformer. Background Technology

[0002] Dry-type power transformers, due to their oil-free, environmentally friendly, and convenient operation and maintenance characteristics, are widely used in urban buildings, rail transit, data centers, and other scenarios with high fire safety requirements. The transformer proposed in application number CN201310090481.5 belongs to the field of transformer equipment technology. The technical solution of this invention includes a transformer housing, built-in coils, input wires, and output wires. Its characteristic is that the transformer housing is provided with an air inlet and an air outlet, and an exhaust fan is installed on the air outlet. Compared with the prior art, the transformer of this invention has better heat dissipation, maintains a low temperature during prolonged use in summer, and can extend the service life of the coils.

[0003] However, existing transformers have some shortcomings that need to be improved. The silicon steel cores of existing transformers have low permeability and high iron losses, making them prone to additional eddy current losses under grid harmonic environments. Their operational efficiency is also difficult to meet the energy conservation and carbon reduction requirements of current high-energy-consuming scenarios. Furthermore, the high-voltage windings mostly use conventional winding structures, and their insulation performance relies on a single epoxy material, resulting in a high risk of partial discharge.

[0004] Existing transformers lack targeted shielding structures, making them susceptible to external electromagnetic interference that could affect output stability. Furthermore, their own magnetic field radiation can interfere with surrounding precision electronic equipment. Traditional dry-type transformers rely heavily on natural heat dissipation from the casing, resulting in low heat transfer efficiency. High temperatures accelerate the aging of insulation materials, limiting the equipment's overload capacity.

[0005] Existing transformers cannot quickly adjust their transformation ratio according to load changes, resulting in poor adaptability to complex load scenarios. Mechanical stress generated during equipment operation and transportation can easily cause winding displacement and core loosening, reducing equipment lifespan. Furthermore, insulation materials are mostly single epoxy resin systems, which are prone to cracking and insulation performance degradation after long-term operation. Therefore, a dry-type power transformer is proposed. Summary of the Invention

[0006] The purpose of this invention is to address the problems raised in the existing background technology. To achieve the above-mentioned objective, this invention provides the following technical solution: a dry-type power transformer, including a transformer housing, a stress-balancing load-bearing upper frame disposed on the transformer housing, a low-voltage integrated quick-connect energy output module disposed on the stress-balancing load-bearing upper frame, a high-voltage insulation coupling access module disposed on the side of the transformer housing, a load-responsive high-voltage tap changer disposed below the high-voltage insulation coupling access module, a transformer assembly disposed inside the transformer housing, a nano-composite epoxy resin encapsulation body disposed above the transformer assembly, a high-frequency eddy current suppression shield disposed on the outer periphery of the transformer housing, a ceramic heat dissipation insert disposed on the lower surface of the high-frequency eddy current suppression shield, multi-dimensional stress buffer insulation pads disposed on both sides of the ceramic heat dissipation inserts, an electromagnetic compatibility shielded grounding busbar disposed below the multi-dimensional stress buffer insulation pads, and an electromagnetic compatibility shielded grounding busbar disposed with a busbar grounding hole.

[0007] As a preferred technical solution of the present invention, the low-voltage integrated quick-connect energy output module includes a low-impedance eddy current suppression type copper busbar and a copper busbar isolation gap connection hole, wherein the low-impedance eddy current suppression type copper busbar is provided with a copper busbar isolation gap connection hole.

[0008] As a preferred technical solution of the present invention, the high-voltage insulation coupling access module includes a field strength homogenization high-voltage terminal electrode terminal, a terminal coupling head, and a high dielectric strength composite insulation connecting rod. One end of the high dielectric strength composite insulation connecting rod is connected to the field strength homogenization high-voltage terminal electrode terminal, and the other end is connected to an external high-voltage line through the terminal coupling head.

[0009] As a preferred technical solution of the present invention, the load-responsive high-voltage tap changer includes multiple high-voltage tap contacts and a resistive flexible conductive connecting piece, wherein the high-voltage tap contacts are disposed at both ends of the resistive flexible conductive connecting piece.

[0010] As a preferred technical solution of the present invention, the transformer assembly includes a laminated nanocrystalline iron core, a low-voltage winding coil, and a high-voltage epoxy cast coil. The laminated nanocrystalline iron core in the transformer assembly is formed by laminating amorphous alloy nanocrystalline strips. The low-voltage winding coil has a foil winding structure, and the high-voltage epoxy cast coil is formed by vacuum pressure impregnation with epoxy resin and integral curing.

[0011] As a preferred embodiment of the present invention, the nanocomposite epoxy resin encapsulation body is composed of an epoxy resin matrix doped with nano-silica and boron nitride particles.

[0012] As a preferred technical solution of the present invention, the high-frequency eddy current suppression shield is a multi-layer metal-insulation composite structure, with an inner layer of highly conductive copper mesh and an outer layer of ferrite absorbing material.

[0013] As a preferred technical solution of the present invention, the ceramic heat dissipation insert is made of aluminum nitride or beryllium oxide ceramic and is arranged in an array on the lower surface of the high-frequency eddy current suppression shield.

[0014] As a preferred technical solution of the present invention, the multidimensional stress buffer insulating pad is made of elastic silicone rubber composite mica material.

[0015] As a preferred technical solution of the present invention, the electromagnetic compatibility shielded grounding busbar is disposed at the bottom of the multidimensional stress buffer insulating pad and is connected to the external grounding wire through the grounding hole of the busbar.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: The transformer assembly of this invention adopts a laminated nanocrystalline iron core, which has higher permeability and lower iron loss compared with traditional silicon steel sheet cores, significantly reducing no-load loss and improving operating efficiency; the low-voltage winding coil adopts a foil winding structure, resulting in uniform current distribution and effectively reducing load loss; the high-voltage epoxy-cast coil is vacuum pressure impregnated with epoxy resin and integrally cured, resulting in strong insulation reliability and high partial discharge initiation voltage. Combined with a load-responsive high-voltage tap changer, the transformer ratio can be dynamically adjusted according to the load, further ensuring stable output voltage and adapting to complex and changing power conditions.

[0017] This invention's nanocomposite epoxy resin encapsulation, by doping with nano-silica and boron nitride particles, improves insulation strength while optimizing thermal conductivity. Combined with a high-dielectric-strength composite insulating connecting rod, it comprehensively blocks electrical breakdown paths, significantly enhancing the equipment's insulation level. The multi-dimensional stress-buffered insulating pad, made of elastic silicone rubber composite mica material, effectively buffers mechanical stress during transportation and operation, preventing winding displacement and core loosening, thus ensuring the equipment's structural stability.

[0018] The high-frequency eddy current suppression shield of this invention adopts a multi-layer metal-insulation composite structure. The inner layer of high-conductivity copper mesh can quickly weaken the internal high-frequency eddy currents, while the outer layer of ferrite absorbing material absorbs external electromagnetic harmonics, thus suppressing electromagnetic interference in both directions, improving the electromagnetic compatibility of the equipment, and adapting to complex power grid environments.

[0019] This invention's high-frequency eddy current suppression shield can quickly dissipate heat from the windings. The arrayed ceramic heat dissipation inserts, made of high thermal conductivity aluminum nitride or beryllium oxide ceramic, further improve heat conduction efficiency, prevent the formation of localized hot spots, and slow down the aging of insulation materials. Combined with the auxiliary heat conduction effect of the nanocomposite epoxy resin encapsulation, the equipment's overload capacity is effectively improved, and its service life is significantly extended.

[0020] The copper busbar isolation gap connection hole of the low-voltage integrated quick-connect energy output module of this invention enables rapid connection of low-voltage lines, while the high-voltage insulation coupling access module can complete the connection of high-voltage lines through the terminal coupling head, greatly simplifying the installation process. At the same time, the dry oil-free design, combined with a high-strength insulation and heat dissipation structure, reduces maintenance and leakage handling, thus lowering long-term maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure provided by the present invention; Figure 2 A partial structural diagram of the high-voltage terminal electrode for field strength homogenization provided by the present invention; Figure 3 This is a partial structural diagram of the ceramic heat dissipation insert provided by the present invention; Figure 4 This is a schematic diagram of the low-voltage winding coil structure provided by the present invention; Figure 5 This is a schematic diagram of the high-voltage insulation coupling access module structure provided by the present invention; Figure 6 This is a schematic diagram of the transformer assembly structure provided by the present invention; Figure 7 This is a schematic diagram of the load-response high-voltage tap changer provided by the present invention; Figure 8 A schematic diagram of the low-voltage integrated quick-connect energy output module provided by the present invention.

[0022] The image shows: 1. Transformer housing; 2. Stress-balanced load-bearing upper frame; 3. Low-voltage integrated quick-connect energy output module; 301. Low-impedance eddy current suppression type copper busbar; 302. Copper busbar isolation gap connection hole; 4. High-voltage insulation coupling access module; 401. Field strength uniformization high-voltage terminal electrode terminal; 402. Terminal coupling head; 403. High dielectric strength composite insulation connecting rod; 5. Load-responsive high-voltage tap changer assembly; 501. High-voltage tap contact point; 502. Resistive flexible conductive connecting piece; 6. Transformer assembly; 601. Laminated nanocrystalline iron core; 602. Low-voltage winding coil; 603. High-voltage epoxy cast coil; 7. Nanocomposite epoxy resin encapsulation body; 8. High-frequency eddy current suppression shield; 9. Ceramic heat dissipation insert; 10. Multi-dimensional stress buffer insulation pad; 11. Electromagnetic compatibility shielded grounding busbar frame; 12. Busbar frame grounding hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] Example 1: A dry-type power transformer includes a transformer housing 1, a stress-balancing load-bearing upper frame 2 on the transformer housing 1, a low-voltage integrated quick-connect energy output module 3 on the stress-balancing load-bearing upper frame 2, a high-voltage insulation coupling access module 4 on the side of the transformer housing 1, a load-responsive high-voltage tap changer 5 below the high-voltage insulation coupling access module, a transformer assembly 6 inside the transformer housing 1, a nano-composite epoxy resin encapsulation body 7 above the transformer assembly 6, a high-frequency eddy current suppression shield 8 on the outer periphery of the transformer housing 1, a ceramic heat dissipation insert 9 on the lower surface of the high-frequency eddy current suppression shield 8, multi-dimensional stress buffer insulation pads 10 on both sides of the ceramic heat dissipation insert 9, an electromagnetic compatibility shielded grounding busbar 11 below the multi-dimensional stress buffer insulation pads 10, and a busbar grounding hole 12 on the electromagnetic compatibility shielded grounding busbar 11.

[0026] The low-voltage integrated quick-connect energy output module 3 includes a low-impedance eddy current suppression type copper busbar 301 and a copper busbar isolation gap connection hole 302. The low-impedance eddy current suppression type copper busbar 301 has a copper busbar isolation gap connection hole 302. The high-voltage insulation coupling access module 4 includes a field strength homogenization high-voltage terminal electrode terminal 401, a terminal coupling head 402, and a high dielectric strength composite insulation connecting rod 403. One end of the high dielectric strength composite insulation connecting rod 403 is connected to the field strength homogenization high-voltage terminal electrode terminal 401, and the other end is connected to an external high-voltage line through the terminal coupling head 402.

[0027] The load-responsive high-voltage tap changer 5 includes multiple high-voltage tap contacts 501 and a resistive flexible conductive connecting piece 502, with the high-voltage tap contacts 501 disposed at both ends of the resistive flexible conductive connecting piece 502.

[0028] The transformer assembly 6 includes a laminated nanocrystalline iron core 601, a low-voltage winding coil 602, and a high-voltage epoxy cast coil 603. The laminated nanocrystalline iron core 601 in the transformer assembly 6 is formed by laminating amorphous alloy nanocrystalline strips; the low-voltage winding coil 602 has a foil winding structure; and the high-voltage epoxy cast coil 603 is formed by vacuum pressure impregnation with epoxy resin and integral curing.

[0029] The nanocomposite epoxy resin encapsulation body 7 is composed of an epoxy resin matrix doped with nano-silica and boron nitride particles. The high-frequency eddy current suppression shield 8 is a multi-layer metal-insulation composite structure, with a highly conductive copper mesh inner layer and a ferrite absorbing material outer layer. The ceramic heat dissipation inserts 9 are made of aluminum nitride or beryllium oxide ceramic and are arranged in an array on the lower surface of the high-frequency eddy current suppression shield 8. The multi-dimensional stress buffer insulating pad 10 is made of elastic silicone rubber composite mica material. The electromagnetic compatibility shielding grounding busbar 11 is located at the bottom of the multi-dimensional stress buffer insulating pad 10 and is connected to the external grounding wire through the busbar grounding hole 12.

[0030] Working principle of dry-type power transformer: External high-voltage lines input power through high-voltage insulation coupling module 4. Terminal coupling head 402 connects to the external lines, conducting high-voltage electricity to the field-uniform high-voltage terminal electrode terminal 401. High-dielectric-strength composite insulation connecting rod 403 ensures insulation between the electrode terminal and the shell while maintaining a stable connection structure, ensuring the safe introduction of high-voltage electricity into the transformer. Load-responsive high-voltage tap changer 5 adjusts the transformer ratio according to actual load conditions. Resistive flexible conductive connecting piece 502 connects different high-voltage tap changer contacts 501, changing the high-voltage winding turns ratio to match the output voltage with the load, ensuring power supply stability. The resistive flexible conductive connecting piece 502 also buffers conductive stress. The high-voltage epoxy-cast coil 603 of the connected high-voltage input transformer assembly 6 generates an alternating magnetic field in the laminated nanocrystalline iron core 601. The laminated nanocrystalline iron core 601 is formed by laminating amorphous alloy nanocrystalline strips, possessing high permeability and low loss characteristics, and can efficiently conduct alternating magnetic fields. An alternating magnetic field passes through the low-voltage winding coil 602, and through electromagnetic induction, a low-voltage alternating current is induced in the low-voltage winding coil 602 with a foil winding structure, thus completing the high-low voltage conversion.

[0031] A nano-composite epoxy resin encapsulator 7 surrounds the transformer assembly 6. Using epoxy resin as the matrix, it is doped with nano-silica and boron nitride particles. The nanoparticles enhance the overall insulation strength and thermal conductivity, isolating the transformer assembly from external structures and assisting in dissipating heat from the windings. A high-frequency eddy current suppression shield 8 employs a multi-layered metal-insulation composite structure for electromagnetic protection. The inner layer of highly conductive copper mesh rapidly conducts and cancels high-frequency eddy currents, while the outer layer of ferrite absorbing material absorbs external high-frequency electromagnetic interference, preventing external electromagnetic signals from affecting the transformation process and blocking the transformer's own electromagnetic field from radiating outwards.

[0032] The heat generated during the transformer process is first conducted to the high-frequency eddy current suppression shield 8, and then quickly dissipated through the array of ceramic heat sinks 9 below. The ceramic heat sinks 9 are made of high thermal conductivity aluminum nitride or beryllium oxide ceramic, which efficiently dissipates heat from inside the transformer.

[0033] The multi-dimensional stress buffer insulation pad 10 is made of elastic silicone rubber composite mica material. While ensuring insulation performance, it buffers the multi-dimensional mechanical stress generated during transformer operation and installation, protecting the structural integrity of the shell and internal components. The electromagnetic compatibility shielded grounding busbar 11 is connected to the external grounding wire through the busbar grounding hole 12, conducting the induced current and interference charge generated during transformer operation to the ground, further enhancing electromagnetic compatibility and operational safety.

[0034] After the transformer is completed, the low-voltage electricity is transmitted to the outside through the low-voltage integrated quick-connect energy output module 3. The low-impedance eddy current suppression type copper busbar 301 realizes low-loss power transmission. The copper busbar isolation gap connection hole 302 can quickly connect with the external low-voltage load line to realize efficient power output.

[0035] Working process of dry-type power transformer: Step 1, initial installation and power-on preparation: Connect the electromagnetic compatibility shielded grounding busbar 11 to the external grounding wire through the busbar grounding hole 12 to ensure the transformer grounding path is complete. The multi-dimensional stress buffer insulation pad 10 supports the entire equipment, offsets the mechanical stress brought about by the installation process, and ensures that the transformer shell 1 and internal components are in a stable state.

[0036] The terminal coupling head 402 of the high-voltage insulation coupling access module 4 is connected to the external high-voltage line. The field strength homogenization high-voltage terminal electrode terminal 401 is kept insulated from the transformer shell 1 by the high dielectric strength composite insulation connecting rod 403, waiting for high voltage input.

[0037] According to the preset load range, by adjusting the resistive flexible conductive connecting piece 502, the high voltage taps 501 at different positions are connected to complete the tap position configuration of the load-responsive high voltage tap changer 5 and determine the initial transformation ratio.

[0038] Step 2, High-voltage power input and transformation stage: External high-voltage power is conducted through the terminal coupling head 402 to the field strength homogenization high-voltage terminal electrode terminal 401, and then safely transported to the inside of the transformer through the high dielectric strength composite insulation connecting rod 403, and connected to the high-voltage epoxy cast coil 603.

[0039] High-voltage alternating current generates an alternating current in the high-voltage epoxy cast coil 603, which in turn excites a high-intensity alternating magnetic field in the laminated nanocrystalline iron core 601. The special lamination structure of the laminated nanocrystalline iron core 601 effectively reduces eddy current losses in the iron core and ensures efficient magnetic field conduction.

[0040] An alternating magnetic field passes through the low-voltage winding coil 602, and based on the principle of electromagnetic induction, a low-voltage alternating current is induced in the foil-type low-voltage winding coil 602, thereby realizing the voltage conversion from high voltage to low voltage.

[0041] Step 3, Operation Optimization and Protection Phase: When external load fluctuates, the load-responsive high-voltage tap changer 5 switches the connection position of the high-voltage tap contact 501 through the resistive flexible conductive connecting piece 502, adjusts the equivalent number of turns of the high-voltage winding in real time, dynamically changes the transformation ratio, and ensures that the low-voltage output voltage is always stable within the set range.

[0042] The nano-composite epoxy resin encapsulator 7 completely encapsulates the transformer assembly 6. Utilizing nanoparticle-modified epoxy resin, it blocks internal electrical breakdown paths and simultaneously conducts the operating heat from the windings to the high-frequency eddy current suppression shield 8. The inner layer of the shield, a highly conductive copper mesh, suppresses high-frequency eddy currents generated during transformation, while the outer layer, a ferrite absorbing material, isolates external electromagnetic interference. The heat is ultimately dissipated rapidly into the air through an array of ceramic heat sinks 9, maintaining the equipment's operating temperature within a safe range.

[0043] Step 4, Low-voltage power output: The low-voltage AC power after transformation is collected to the low-voltage integrated quick-connect energy output module 3, and is conducted with low loss through the low-impedance eddy current suppression type copper busbar 301 to the copper busbar isolation gap connection hole 302, connecting to the external low-voltage load line to complete the power output and power the terminal equipment.

[0044] Example 2: A dry-type power transformer, wherein the high-voltage epoxy resin cast coil 603 of the high-voltage input transformer assembly 6 generates an alternating magnetic field in the laminated nanocrystalline iron core 601. The alternating magnetic field passes through the low-voltage winding coil 602, generating a low-voltage electromotive force through electromagnetic induction, thus completing the high-low voltage conversion, as shown in the following formula: in: Induced electromotive force (EMF) in windings (unit: volts, V), for high-voltage windings, For the low-voltage winding, , ; Power supply frequency (unit: Hertz, Hz), which is the frequency of the externally input high-voltage electricity; Number of turns in the winding (unit: turns), corresponding to the high-voltage winding. or low voltage winding ; The maximum main magnetic flux (in Weber, Wb) in the laminated nanocrystalline iron core 601 is determined by the input voltage. and frequency The decision was made that the high permeability of the laminated nanocrystalline iron core can improve... This improves conduction efficiency and reduces magnetic loss.

[0045] The 601 laminated nanocrystalline iron core is formed by laminating amorphous alloy nanocrystalline strips, possessing high magnetic permeability and low loss characteristics. It can efficiently conduct alternating magnetic fields and reduce losses. This reduces losses, improves electromagnetic induction efficiency, and thus enhances the energy conversion efficiency of the transformer.

[0046] The high-frequency eddy current suppression shield 8 is used to suppress high-frequency eddy current losses and reduce energy waste. The core calculation formula for its eddy current losses is as follows: in: Eddy current loss power (unit: watt, W), which is the energy loss generated by high-frequency eddy currents in the shielding enclosure. Eddy current loss coefficient (unitless) is related to the structure and material of the shield. A multi-layered metal-insulator composite structure in a high-frequency eddy current suppression shield can reduce this loss. ; The frequency (unit: Hertz, Hz) of high-frequency interference signals increases with frequency; the higher the frequency, the greater the eddy current loss. : Maximum magnetic flux density of a high-frequency alternating magnetic field (unit: Tesla, T). The thickness of the shielding metal layer (unit: meter, m) and the thickness of the inner high-conductivity copper mesh must be matched. Reduce eddy current losses; The resistivity of the shielding metal layer (unit: ohm·m), and the resistivity of the high-conductivity copper mesh. Smaller size allows for rapid conduction of eddy currents, reducing losses; Volume of the shielding metal layer (unit: cubic meters, m³); The inner layer of the high-conductivity copper mesh of the high-frequency eddy current suppression shielding cover 8 can quickly conduct and cancel high-frequency eddy currents, while the outer layer of ferrite absorbing material absorbs external high-frequency electromagnetic interference, essentially reducing... and This reduces eddy current losses. This prevents external electromagnetic signals from affecting the transformation process and also blocks the transformer's own electromagnetic field from radiating outwards.

[0047] The ceramic heat sink 9 is used to dissipate the heat generated during transformer operation. The auxiliary calculation formula for its heat dissipation power is as follows: Where Q is the heat dissipation power (unit: watt, W), which is the heat dissipation of the ceramic heat sink per unit time; h is the surface heat transfer coefficient (unit: watt / (square meter·Kelvin), W / (m²·K)), which is related to the material and surface structure of the ceramic heat sink. Aluminum nitride and beryllium oxide ceramics have higher h values ​​and higher heat dissipation efficiency. A: Heat dissipation area of ​​the ceramic heat sink (unit: square meters, m²). An array arrangement increases A, improving heat dissipation. ΔT: Temperature difference between the heat sink and the environment (unit: Kelvin, K), related to the transformer's operating temperature and ambient temperature; a larger temperature difference results in faster heat dissipation. The ceramic heat sink 9 is made of aluminum nitride or beryllium oxide ceramic and is arranged in an array below the high-frequency eddy current suppression shield 8. It can quickly dissipate heat from the shield and transformer housing, preventing equipment damage due to overheating and ensuring long-term stable operation of the transformer.

[0048] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A dry-type power transformer, comprising a transformer housing (1), characterized in that, The transformer housing (1) is provided with a stress equalization bearing upper frame (2), the stress equalization bearing upper frame (2) is provided with a low voltage integrated quick-connect energy output module (3), the side of the transformer housing (1) is provided with a high voltage insulation coupling access module (4), the lower part of the high voltage insulation coupling access module is provided with a load-response high voltage tapping component (5), the transformer housing (1) is provided with a transformer component (6), the upper part of the transformer component (6) is provided with a nano-composite epoxy resin encapsulation body (7), the outer periphery of the transformer housing (1) is provided with a high frequency eddy current suppression shield (8), the lower surface of the high frequency eddy current suppression shield (8) is provided with a ceramic heat dissipation insert (9), the ceramic heat dissipation insert (9) is provided with multi-dimensional stress buffer insulation pads (10) on both sides, the lower part of the multi-dimensional stress buffer insulation pads (10) is provided with an electromagnetic compatibility shielded grounding busbar (11), the electromagnetic compatibility shielded grounding busbar (11) is provided with a busbar grounding hole (12).

2. The dry-type power transformer according to claim 1, characterized in that, The low-voltage integrated quick-connect energy output module (3) includes a low-impedance eddy current suppression type copper busbar (301) and a copper busbar isolation gap connection hole (302). The low-impedance eddy current suppression type copper busbar (301) is provided with a copper busbar isolation gap connection hole (302).

3. The dry-type power transformer according to claim 2, characterized in that, The high-voltage insulation coupling access module (4) includes a field strength homogenization high-voltage terminal electrode terminal (401), a terminal coupling head (402), and a high dielectric strength composite insulation connecting rod (403). One end of the high dielectric strength composite insulation connecting rod (403) is connected to the field strength homogenization high-voltage terminal electrode terminal (401), and the other end is connected to an external high-voltage line through the terminal coupling head (402).

4. The dry-type power transformer according to claim 3, characterized in that, The load-responsive high-voltage tap changer assembly (5) includes multiple high-voltage tap contacts (501) and a resistive flexible conductive connecting piece (502), wherein the high-voltage tap contacts (501) are disposed at both ends of the resistive flexible conductive connecting piece (502).

5. The dry-type power transformer according to claim 4, characterized in that, The transformer assembly (6) includes a laminated nanocrystalline iron core (601), a low-voltage winding coil (602), and a high-voltage epoxy cast coil (603). The laminated nanocrystalline iron core (601) in the transformer assembly (6) is formed by laminating amorphous alloy nanocrystalline strips. The low-voltage winding coil (602) has a foil winding structure. The high-voltage epoxy cast coil (603) is formed by vacuum pressure impregnation with epoxy resin and integral curing.

6. The dry-type power transformer according to claim 5, characterized in that, The nanocomposite epoxy resin encapsulation (7) is composed of an epoxy resin matrix doped with nano-silica and boron nitride particles.

7. The dry-type power transformer according to claim 6, characterized in that, The high-frequency eddy current suppression shield (8) is a multi-layer metal-insulation composite structure, with an inner layer of highly conductive copper mesh and an outer layer of ferrite absorbing material.

8. The dry-type power transformer according to claim 7, characterized in that, The ceramic heat dissipation insert (9) is made of aluminum nitride or beryllium oxide ceramic and is arranged in an array on the lower surface of the high-frequency eddy current suppression shield (8).

9. The dry-type power transformer according to claim 8, characterized in that, The multidimensional stress buffer insulating pad (10) is made of elastic silicone rubber composite mica material.

10. The dry-type power transformer according to claim 9, characterized in that, The electromagnetic compatibility shielded grounding busbar (11) is located at the bottom of the multidimensional stress buffer insulating pad (10) and is connected to the external grounding wire through the grounding hole (12) of the busbar.

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