Compact explosion-proof voltage transformer

Abstract

The utility model relates to the technical field of railway vehicles, in particular to a compact explosion-proof voltage transformer. Comprising a primary terminal, a primary winding, a secondary winding, a secondary framework, an iron core, epoxy resin, a mounting bottom plate, a transformer body bracket, a lifting ring and a secondary wiring terminal, the primary terminal is connected with the high-voltage end of the primary winding, the primary winding is sleeved on the secondary winding, and the primary winding and the secondary winding are simultaneously fixed on the secondary framework; the iron core penetrates through the secondary framework to form internal magnetic flux of the mutual inductor; the primary terminal, the primary winding, the secondary winding, the secondary framework and the iron core form a structure of an internal transformer body of the transformer, so that the voltage transformer is successfully adapted to a limited space in a high-voltage box of a city vehicle through an innovative compact design, and high integration and space optimization of the transformer are realized on the premise of keeping excellent electrical performance; and the effect that the space in the high-voltage box is compact is effectively achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicles, in particular to a compact explosion-proof voltage transformer. Background Art

[0002] In the prior art, the voltage transformers used in the high-voltage equipment boxes of suburban trains all belong to the equipment outside the roof boxes and are all non-explosion-proof products; they occupy a large space in the high-voltage equipment box. In addition, because all the voltage transformers are non-explosion-proof products, serious faults such as the explosion of the voltage transformer may occur, causing irreversible damage to the main high-voltage components (main circuit breaker, high-voltage disconnector, lightning arrester, etc.) in the box, and even affecting other equipment of the vehicle.

[0003] Currently, the voltage transformers used in the high-voltage equipment boxes of suburban trains are all equipment outside the box. To meet the outdoor electrical clearance and creepage distance, their volumes are relatively bulky. Therefore, after being installed in the high-voltage equipment box, they seriously affect the size and weight of the entire box, and even cannot meet the requirements of vehicle interfaces. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a compact explosion-proof voltage transformer for the defects existing in the prior art, so as to successfully adapt the voltage transformer to the limited space in the high-voltage box of the suburban train through an innovative compact design. On the premise of maintaining excellent electrical performance, the transformer realizes high integration and space optimization, and effectively solves the problem of limited space in the high-voltage box.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a compact explosion-proof voltage transformer, including a primary terminal, a primary winding, a secondary winding, a secondary skeleton, an iron core, epoxy resin, a mounting base plate, a body bracket, a lifting ring, and a secondary wiring terminal; the primary terminal is connected to the high-voltage end of the primary winding, the primary winding is sleeved on the secondary winding, and the primary winding and the secondary winding are simultaneously fixed on the secondary skeleton; the iron core passes through the secondary skeleton to form the internal magnetic flux of the transformer; the primary terminal, the primary winding, the secondary winding, the secondary skeleton, and the iron core form the internal body of the transformer.

[0006] Further, the body of the transformer is potted in the epoxy resin.

[0007] Further, the epoxy resin is connected together through the body bracket and the mounting base plate.

[0008] Further, the primary winding is 25KV, the secondary winding is 225V, the accuracy is 20.5 level, and the insulation level is 240.5KV / 100KV / 185KV.

[0009] Further, the interior of the mutual inductor is a mesh explosion-proof structure.

[0010] Further, the electrical interface of the mutual inductor uses threaded holes.

[0011] Further, the iron core of the mutual inductor adopts an R-shaped structure.

[0012] Further, the electrical clearance and creepage distance of the mutual inductor meet the kV requirements, and the external insulation adopts a petticoat form.

[0013] Further, the mutual inductor is equipped with an insulating sheath.

[0014] It includes a primary terminal, a primary winding, a secondary winding, a secondary skeleton, an iron core, epoxy resin, a mounting base plate, a body bracket, a lifting ring, and a secondary wiring terminal; the primary terminal is connected to the high-voltage end of the primary winding, the primary winding is sleeved on the secondary winding, and the primary winding and the secondary winding are simultaneously fixed on the secondary skeleton; the iron core passes through the secondary skeleton to form the internal magnetic flux of the mutual inductor; the primary terminal, the primary winding, the secondary winding, the secondary skeleton, and the iron core form the structure of the internal body of the mutual inductor, achieving the effect that through an innovative compact design, the voltage mutual inductor is successfully adapted to the limited space in the high-voltage box of the urban rail vehicle. On the premise of maintaining excellent electrical performance, the mutual inductor realizes high integration and space optimization, effectively solving the problem of limited space in the high-voltage box. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is the external view of the present invention;

[0017] Figure 2 It is the perspective view of the present invention;

[0018] Figure 3 It is the application installation diagram of the present invention;

[0019] Figure 4 It is the electrical wiring principle of the present invention;

[0020] Reference Signs:

[0021] Primary terminal 1, primary winding 2, secondary winding 3, secondary skeleton 4, iron core 5, epoxy resin 6, mounting base plate 7, body bracket 8, secondary wiring terminal 9, lifting ring 10. Specific embodiments

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] A compact explosion-proof voltage transformer, as Figure 1 、 2 、shown in Figure 4, includes a primary terminal 1, a primary winding 2, a secondary winding 3, a secondary skeleton 4, an iron core 5, an epoxy resin 6, a mounting base plate 7, a body bracket 8, a secondary wiring terminal 9, and a lifting ring 10; the primary terminal 1 is connected to the high-voltage end of the primary winding 2, the primary winding 2 is sleeved on the secondary winding 3, and the primary winding 2 and the secondary winding 3 are simultaneously fixed on the secondary skeleton 4; the iron core 5 passes through the secondary skeleton 4 to form the internal magnetic flux of the transformer; the primary terminal 1, the primary winding 2, the secondary winding 3, the secondary skeleton 4, and the iron core 5 form the internal body of the transformer.

[0025] Specifically, by using epoxy resin 6 as the encapsulation material, the direct contact between the internal body and the external environment is effectively isolated, greatly enhancing the explosion-proof ability of the equipment. Under extreme working conditions, even if a fault occurs inside, it can effectively prevent the spread of explosive gases or flames, protecting the surrounding high-voltage components and other vehicle equipment from damage. By optimizing the internal winding structure, that is, two sets of primary windings 2 are sleeved on the secondary winding 3 and are jointly fixed on the secondary skeleton 4, unnecessary space occupation is reduced. At the same time, by using the compact encapsulation technology of epoxy resin 6, the overall volume and weight are significantly reduced. This compact design makes the voltage transformer more suitable for installation in the high-voltage equipment box, reducing the size and weight of the entire box and improving the compatibility of the vehicle interface. The precise layout of the internal structure and the use of high-quality insulating materials ensure that the electrical clearance and creepage distance meet or exceed the outdoor environmental requirements, improving the electrical performance and system stability. At the same time, a good magnetic circuit design, that is, the iron core 5 passes through the secondary skeleton 4, ensures the measurement accuracy and response speed of the transformer.

[0026] As a preference of the above embodiment, as Figure 1 , 3 shown, the body of the transformer is potted inside the epoxy resin 6.

[0027] Specifically, the epoxy resin 6 can effectively isolate the erosion of the internal structure of the transformer by external moisture, corrosive gases or chemical substances, ensuring that the transformer can still work stably in harsh environments. This fully enclosed potting design further improves the environmental adaptability and service life of the transformer. Potting the body completely in the epoxy resin not only increases the physical strength of the transformer but also forms a solid explosion-proof barrier. In extreme cases, even if a short circuit or fault occurs inside, the energy and sparks generated will be quickly absorbed and isolated by the epoxy resin, thus preventing the leakage of explosive gases or flames and ensuring the safety of the surrounding equipment and personnel. The potting layer of the epoxy resin can also play a certain degree of electromagnetic shielding role, reducing the interference of external electromagnetic fields on the internal signals of the transformer and improving the measurement accuracy and stability. At the same time, it also reduces the electromagnetic radiation of the transformer itself to the external environment, which is beneficial to the electromagnetic compatibility of the vehicle's electrical system.

[0028] As a preference of the above embodiment, as Figure 1 , 3 shown, the epoxy resin 6 is connected together through the body bracket 7 and the mounting base plate.

[0029] Specifically, through the combination of the body bracket 7 and the mounting base plate, the epoxy resin 6 is more firmly supported. This design ensures that the instrument transformer can maintain a stable posture during transportation, installation, and use, reducing the risk of damage caused by vibration or impact. At the same time, with the assistance of the body bracket 7 and the mounting base plate, the installation process of the instrument transformer becomes more simple and fast. The installer only needs to place the instrument transformer in the predetermined position and fix the mounting base plate to achieve stable installation without complex adjustment and calibration. During the potting process of the epoxy resin 6, certain heat may be generated, and the design of the body bracket 7 and the mounting base plate helps to dissipate the heat. Through a reasonable heat conduction path design, it can ensure that the instrument transformer maintains an appropriate temperature range during operation, avoiding performance degradation or damage caused by overheating. During the vehicle operation, various road conditions and vibrations may be encountered. Through the connection design of the body bracket 7 and the mounting base plate, the seismic performance of the instrument transformer can be further enhanced. This design can absorb and disperse vibration energy, reducing the impact and damage to the internal structure of the instrument transformer.

[0030] As a preference of the above embodiment, as Figure 4 shown, the primary winding 2 is 25KV, the secondary winding 3 is 225V, the accuracy is 20.5 levels, and the insulation level is 240.5KV / 100KV / 185KV.

[0031] As a preference of the above embodiment, as Figure 3 shown, the inside of the instrument transformer is a mesh explosion-proof structure.

[0032] Specifically, through its unique structural design, the mesh explosion-proof structure can form multiple levels of explosion-proof barriers inside the instrument transformer. Under extreme working conditions, such as internal short circuits or faults, the mesh structure can effectively disperse and absorb the energy generated by the explosion, preventing the rapid spread of explosive gases or flames, thus significantly improving the explosion-proof performance of the instrument transformer and protecting the safety of surrounding equipment and personnel. The mesh explosion-proof structure not only improves the explosion-proof ability of the instrument transformer but also enhances its overall structural strength and stability. The mesh structure can withstand greater mechanical stress and impact, reducing structural damage caused by vibration or external impact, and ensuring stable performance output of the instrument transformer in complex and changeable working environments.

[0033] As a preference of the above embodiment, as Figure 1 、 3 shown, the electrical interface of the instrument transformer adopts threaded holes.

[0034] Specifically, the design of threaded holes can provide a more stable electrical connection. Through the tightening effect of the threads, it can ensure the close contact between the electrical interface and the connecting wire or other devices, reducing the problem of poor contact caused by loosening or vibration. This stable connection method helps to improve the operation reliability and safety of the mutual inductor.

[0035] As a preference of the above embodiment, as Figure 1 shown, the core of the mutual inductor adopts an R-shaped structure.

[0036] Specifically, the R-shaped core structure breaks the traditional structure types of transformer cores such as C-shaped and E-shaped with square cross-sections. It is formed by continuously winding a high-quality silicon steel strip that uniformly transitions from narrow to wide and then from wide to narrow. The core has no cutting, and the cross-section is approximately circular. This structure makes the magnetic circuit smoother, reduces magnetic resistance and magnetic leakage phenomena, thereby improving the conversion efficiency and measurement accuracy of the mutual inductor. At the same time, due to the high-performance silicon steel sheet material of the R-shaped core, its magnetic properties are excellent, further enhancing the overall performance of the mutual inductor. Combined with the precise layout of other components, as well as the continuous winding structure and non-cutting design of the R-shaped core, the transformer as a whole is more compact, can effectively save space, reduce the overall weight of the equipment box, and improve the load capacity and operation efficiency of the vehicle.

[0037] As a preference of the above embodiment, as Figure 1 shown, the electrical clearance and creepage distance of the mutual inductor meet the requirements of 25 kV, and the external insulation adopts a petticoat form.

[0038] As a preference of the above embodiment, as Figure 1 shown, the mutual inductor is equipped with an insulating sheath.

[0039] Specifically, through the structure that the electrical clearance and creepage distance of the mutual inductor meet the requirements of 25 kV, the external insulation adopts a petticoat form, and the mutual inductor is equipped with an insulating sheath, it is used to provide additional insulation protection to prevent the insulation performance of the equipment from decreasing or failing due to external factors such as mechanical damage, moisture, and contamination, further improving the safety and reliability of the equipment.

[0040] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact explosion-proof voltage transformer, characterized in that: It includes a primary terminal (1), a primary winding (2), a secondary winding (3), a secondary skeleton (4), an iron core (5), epoxy resin (6), a mounting base plate (7), a body bracket (8), a secondary wiring terminal (9), and a lifting ring (10); The primary terminal (1) is connected to the high-voltage end of the primary winding (2). The primary winding (2) is sleeved on the secondary winding (3), and the primary winding (2) and the secondary winding (3) are simultaneously fixed on the secondary skeleton (4); The iron core (5) passes through the secondary skeleton (4) to form the internal magnetic flux of the transformer; The primary terminal (1), the primary winding (2), the secondary winding (3), the secondary skeleton (4), and the iron core (5) constitute the internal body of the transformer; 2. The compact explosion-proof voltage transformer according to claim 1, wherein The body of the transformer is potted inside the epoxy resin (6); 3. The compact explosion-proof voltage transformer according to claim 2, characterized in that, The epoxy resin (6) is connected together through the body bracket (8) and the mounting base plate; 4. The compact explosion-proof voltage transformer according to claim 1, characterized in that, The primary winding (2) is 25KV, the secondary winding (3) is 225V, the accuracy is 20.5 levels, and the insulation level is 240.5KV / 100KV / 185KV; 5. The compact explosion-proof voltage transformer according to claim 1, characterized in that, The interior of the transformer is a mesh explosion-proof structure; 6. The compact explosion-proof voltage transformer according to claim 1, characterized in that, The electrical interface of the transformer uses threaded holes; 7. The compact explosion-proof voltage transformer according to claim 1, characterized in that, The iron core of the transformer adopts an R-type structure; 8. The compact explosion-proof voltage transformer according to claim 1, characterized in that, The electrical clearance and creepage distance of the transformer meet the requirements of 25kV, and the external insulation adopts the form of umbrella skirts; 9. The compact explosion-proof voltage transformer according to claim 1, characterized in that the transformer is fitted with an insulating sheath.

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