Portable transformer for electric power engineering construction

Abstract

The utility model discloses a portable transformer for electric power engineering construction, relates to the technical field of electric power engineering, and overcomes the defects that an existing transformer for electric power engineering is poor in portability and electromagnetic compatibility. The transformer is compact in overall structure and easy to carry through the portable support and the portable handle, the electromagnetic shielding effect of the transformer is improved through the electromagnetic shielding shell, and the problem of heat accumulation generated in the working process of the transformer is solved through the cooling system fan; by means of the portable oil tank, oil of the transformer can be supplemented and replaced more conveniently and quickly, the connection process between the transformer and the power source and the connection process between the transformer and the load are simplified through the quick connector, and the portability and the electromagnetic compatibility of the transformer for electric power engineering construction are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power engineering, and more precisely to a portable transformer for power engineering construction. Background Art

[0002] With the rapid development of social economy, the scale and quantity of power engineering projects are increasing day by day, and the demand for transformers used in power engineering construction is also growing. Especially in infrastructure construction and the process of urbanization, the rapid deployment of power facilities becomes particularly important. In recent years, the power industry has been continuously pursuing the goals of technological innovation and energy conservation and emission reduction to meet the requirements of sustainable development. In this context, the transformers for power engineering construction not only need to meet the basic electrical performance requirements but also need to have higher reliability and flexibility to adapt to diverse construction scenarios. At the same time, with the development of smart grid technology, power equipment also needs to be more intelligent and efficient to support a wider range of energy management and distribution.

[0003] Currently, the transformers for power engineering construction are widely used in various power engineering projects, including but not limited to substation construction, transmission and distribution network renovation, etc. Such transformers usually adopt oil-immersed or dry-type designs and can withstand continuous operation in high-voltage environments. However, despite the fact that modern transformers have adopted advanced materials and technologies, there are still some technical limitations, especially room for improvement in terms of portability and electromagnetic compatibility.

[0004] In power engineering construction, transformers often need to be moved between different construction sites. However, due to the large volume and heavy weight of traditional transformers for power engineering construction, this brings many inconveniences to transportation and installation. The handling of heavy transformers not only consumes a large amount of manpower and material resources but may also be difficult to be installed in place smoothly due to the limitations of the construction site. This not only affects the construction progress but may also increase the project cost. In addition, the transformers for power engineering construction will generate strong electromagnetic fields during operation. If effective shielding measures are not taken, these electromagnetic fields may interfere with the surrounding electronic devices and communication systems. In addition, external electromagnetic interference may also affect the stability and reliability of the transformer itself. The EMC problem not only affects the normal operation of the power system but may also pose safety hazards. For example, in some cases, electromagnetic interference may cause the protection device to malfunction, thus affecting the safe and stable operation of the entire power grid.

[0005] Therefore, to solve the above problems, the utility model discloses a portable transformer for power engineering construction. Summary of the Utility Model

[0006] The purpose of the present utility model is to design a portable transformer for power engineering construction. By adopting the designs of a portable bracket and a portable handle, the overall structure of the transformer is made compact and easy to carry. The portable bracket is made of lightweight and high-strength materials such as aluminum alloy, which not only reduces the overall weight but also enhances the stability. The setting of the portable handle further facilitates manual handling, greatly improving the portability of the transformer and enabling flexible movement and deployment at the complex and changeable power engineering construction site. The adoption of the electromagnetic shielding shell, especially its multi-layer structure design (outer shell layer, shielding layer, inner lining layer), significantly improves the electromagnetic shielding effect of the transformer. The combined action of the conductive metal material (such as aluminum) of the outer shell layer and the copper material of the shielding layer effectively blocks the influence of external electromagnetic interference on the inside of the transformer, and at the same time reduces the electromagnetic radiation generated by the transformer from interfering with the surrounding environment and other devices. This design enables the transformer to operate stably at the power engineering construction site with a complex electromagnetic environment, improving the electromagnetic compatibility. In addition, the setting of the cooling system fan effectively solves the problem of heat accumulation generated during the operation of the transformer. The fan is connected to the transformer power supply system through wires and can automatically adjust the rotation speed according to the working state of the transformer to achieve intelligent cooling. At the same time, the fan is installed inside the transformer through a fixed bracket, ensuring a good cooling effect and extending the service life of the transformer. Secondly, the design of the portable fuel tank makes the replenishment and replacement of transformer oil more convenient and fast. The observation window on the outside of the fuel tank allows the oil level to be monitored at any time, while the pressure relief valve ensures the safety of the internal pressure of the fuel tank. In addition, the adoption of the quick-connect connector simplifies the connection process between the transformer and the power supply and the load, reduces the safety hazards caused by wiring errors, and improves the maintenance efficiency. The high- and low-voltage windings are wound with flat copper wires, which not only improves the conductivity of the windings but also makes the winding structure more compact, facilitating heat dissipation and reducing electromagnetic interference. At the same time, the windings are connected to the quick-connect connector through internal terminals, further improving the reliability and safety of the connection.

[0007] In order to achieve the above technical effects, the present utility model adopts the following technical solutions:

[0008] A portable transformer for electric power engineering construction, comprising an electromagnetic shielding shell, wherein a iron core is arranged at the central position inside the electromagnetic shielding shell; high and low voltage windings are sleeved around the iron core in layers; the high and low voltage windings include a primary winding and a secondary winding; the primary winding is sleeved around the center of the iron core; the secondary winding is located outside the primary winding; an electrical isolation layer is arranged between the primary winding, the secondary winding and the iron core; a heat dissipation system fan is arranged on one side of the electromagnetic shielding shell; the heat dissipation system fan is connected to the electromagnetic shielding shell through a fixed bracket; a portable handle is arranged above the heat dissipation system fan; a portable fuel tank is arranged on the other side of the electromagnetic shielding shell, the portable fuel tank is welded on the electromagnetic shielding shell and is connected to the transformer through an oil pipeline; a portable support is arranged at the bottom of the electromagnetic shielding shell; bolt locking devices are arranged at the four corners of the portable support; a quick connector is arranged at the top of the electromagnetic shielding shell, and the portable transformer is connected to a power supply and a load through the quick connector.

[0009] As a further description of the above technical solution:

[0010] The iron core is made of cold-rolled high-permeability grain-oriented silicon steel sheets stacked.

[0011] As a further description of the above technical solution:

[0012] The electromagnetic shielding shell includes a shell layer, a shielding layer and a lining layer; the shell layer is made of a conductive metal material aluminum and serves as the first electromagnetic shielding layer; the shielding layer is made of copper material and serves as the second electromagnetic shielding layer to improve the electromagnetic shielding effect; the lining layer is made of plastic to avoid short circuit; the electromagnetic shielding shell adopts a segmented structure, including a top shell, a side shell and a bottom shell; the top shell covers the top of the transformer and is provided with a number of small holes; the top shell is connected to the side shell through a conductive sealing strip; the side shell is connected to the bottom shell through screws.

[0013] As a further description of the above technical solution:

[0014] The shell layer and the shielding layer are connected through a conductive adhesive; the shielding layer and the lining layer are connected through a non-conductive adhesive; the conductive adhesive adopts silver epoxy resin adhesive, and the non-conductive adhesive adopts epoxy resin adhesive.

[0015] As a further description of the above technical solution:

[0016] An observation window is arranged outside the portable fuel tank; a pressure relief valve and an oil inlet are arranged at the top of the portable fuel tank.

[0017] As a further description of the above technical solution:

[0018] The high and low voltage windings are wound with flat copper wires; the high and low voltage windings are connected to the quick-connect connector through internal terminals.

[0019] As a further description of the above technical solution:

[0020] The quick-connect connector adopts a spring-loaded structure; positioning pins and guide grooves are arranged inside the interface of the quick-connect connector.

[0021] As a further description of the above technical solution:

[0022] The fan of the heat dissipation system is connected to the power supply system of the transformer through wires; the fan of the heat dissipation system is installed inside the transformer through a fixed bracket; the fan of the heat dissipation system includes a fan blade, a motor and a control circuit.

[0023] As a further description of the above technical solution:

[0024] The portable bracket is made of aluminum alloy material; the portable bracket is fixedly connected to the transformer through bolts.

[0025] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows: By adopting the designs of a portable bracket and a portable handle, the overall structure of the transformer is compact and easy to carry. The portable bracket is made of lightweight and high-strength materials such as aluminum alloy, which not only reduces the overall weight but also enhances the stability. The setting of the portable handle further facilitates manual handling, greatly improving the portability of the transformer and enabling flexible movement and deployment at the complex and changeable construction sites of power engineering. The adoption of the electromagnetic shielding shell, especially its multi-layer structure design (outer shell layer, shielding layer, inner lining layer), significantly improves the electromagnetic shielding effect of the transformer. The combined action of the conductive metal material (such as aluminum) of the outer shell layer and the copper material of the shielding layer effectively blocks the influence of external electromagnetic interference on the inside of the transformer, and at the same time reduces the electromagnetic radiation generated by the transformer from interfering with the surrounding environment and other equipment. This design enables the transformer to operate stably at the construction sites of power engineering with a complex electromagnetic environment, improving the electromagnetic compatibility. In addition, the setting of the cooling system fan effectively solves the problem of heat accumulation generated during the operation of the transformer. The fan is connected to the transformer power supply system through wires and can automatically adjust the rotation speed according to the working state of the transformer to achieve intelligent heat dissipation. At the same time, the fan is installed inside the transformer through a fixed bracket, ensuring good heat dissipation effect and extending the service life of the transformer. Secondly, the design of the portable fuel tank makes the replenishment and replacement of transformer oil more convenient and fast. The observation window on the outside of the fuel tank allows the oil level to be monitored at any time, while the pressure relief valve ensures the safety of the internal pressure of the fuel tank. In addition, the adoption of the quick-connect connector simplifies the connection process between the transformer and the power supply and the load, reduces the safety hazards caused by wiring errors, and improves the maintenance efficiency. The high- and low-voltage windings are wound with flat copper wires, which not only improves the conductive performance of the windings but also makes the winding structure more compact, facilitating heat dissipation and reducing electromagnetic interference. At the same time, the windings are connected to the quick-connect connector through internal terminal posts, further improving the reliability and safety of the connection. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0027] Figure 1 It is the structural diagram of the device of the present utility model;

[0028] Figure 2 It is the side view structural schematic diagram of the present utility model;

[0029] Reference numerals in the figure: 1, electromagnetic shielding case; 2, radiator fan; 3, portable handle; 4, portable fuel tank; 5, portable bracket; 6, quick connector. Detailed implementation mode

[0030] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figure 1 - Figure 2 shown, a portable transformer for power engineering construction includes an electromagnetic shielding case 1. A iron core is arranged at the center inside the electromagnetic shielding case 1; high and low voltage windings are sleeved on the outside of the iron core in layers; the high and low voltage windings include a primary winding and a secondary winding; the primary winding is sleeved around the center of the iron core; the secondary winding is located outside the primary winding; an electrical isolation layer is arranged between the primary winding, the secondary winding and the iron core; a radiator fan 2 is arranged on one side of the electromagnetic shielding case 1; the radiator fan 2 is connected to the electromagnetic shielding case 1 through a fixed bracket; a portable handle 3 is arranged above the radiator fan 2; a portable fuel tank 4 is arranged on the other side of the electromagnetic shielding case 1, and the portable fuel tank 4 is welded to the electromagnetic shielding case 1 and is connected to the transformer through an oil pipeline; a portable bracket 5 is arranged at the bottom of the electromagnetic shielding case 1; bolt locking devices are arranged at the four corners of the portable bracket 5; a quick connector 6 is arranged at the top of the electromagnetic shielding case 1, and the portable transformer is connected to a power supply and a load through the quick connector 6.

[0032] In a specific embodiment, the electromagnetic shielding case is used to provide electromagnetic shielding, protect the inside of the transformer from external electromagnetic interference, and reduce the impact of electromagnetic radiation generated by the transformer itself on the surrounding environment. Among them, the electromagnetic shielding case is composed of a shell layer, a shielding layer and a lining layer. The shell layer is made of a conductive metal material such as aluminum, which can reflect and absorb part of the electromagnetic wave; the shielding layer is made of a copper material with high conductivity to further absorb and dissipate the electromagnetic wave; the lining layer is made of an insulating material such as plastic to prevent internal short circuits. The multi-layer structure acts together to form an effective electromagnetic shielding barrier.

[0033] The iron core is used as the magnetic flux path of the transformer to transfer energy between the high and low voltage windings through an alternating magnetic field. Among them, the iron core is made of cold-rolled high-permeability grain-oriented silicon steel sheets stacked together, which has good magnetic conductivity and low loss characteristics. When an alternating current is applied to the primary side winding, an alternating magnetic field will be generated in the iron core, and this magnetic field is transmitted to the secondary side winding through the iron core, so that an induced electromotive force is generated in the secondary side winding, realizing the transformation of voltage.

[0034] The high- and low-voltage windings are used to achieve voltage transformation and energy transfer. Among them, the high- and low-voltage windings are wound with flat copper wires and are located on the inner and outer sides of the iron core respectively. After alternating current is applied to the low-voltage side of the primary winding, an alternating magnetic field is generated in the iron core; the high-voltage side of the secondary winding then induces an electromotive force through this magnetic field, thereby realizing voltage increase or decrease. Insulation is maintained between the windings through an electrical isolation layer to prevent short circuits.

[0035] The portable fuel tank is used to store and supply transformer oil to ensure the normal operation and heat dissipation of the transformer. Among them, the portable fuel tank is fixed to the electromagnetic shielding case by means such as welding and is connected to the inside of the transformer through an oil pipeline. The fuel tank is filled with transformer oil. When the transformer is working, the oil circulates between the windings and the iron core, absorbing and carrying away heat, playing a role in heat dissipation. The observation window on the outside of the fuel tank is used to monitor the oil level, and the pressure relief valve is used to automatically release pressure when the pressure inside the fuel tank is too high to ensure safety.

[0036] The radiator fan of the heat dissipation system is used to enhance the heat dissipation effect of the transformer and prevent damage caused by overheating. Among them, the radiator fan of the heat dissipation system is connected to the power supply system of the transformer through wires and automatically adjusts the rotation speed according to the working state of the transformer. The fan blades of the fan rotate under the drive of the motor, generating air flow, taking away the heat generated inside the transformer and dissipating it into the surrounding environment. The fixed bracket is used to firmly install the fan inside the transformer.

[0037] The portable bracket is used to provide stable support for easy handling and installation of the transformer. Among them, the portable bracket is made of lightweight and high-strength materials such as aluminum alloy and is connected to the bottom of the transformer through bolts. Bolt locking devices are provided at the four corners of the bracket to ensure a stable connection between the bracket and the transformer. During handling, the transformer can be lifted as a whole through the portable handle and moved to the designated position.

[0038] The quick-connect connector is used to achieve quick and reliable connection between the transformer and the power supply and load. Among them, the quick-connect connector adopts a spring-loaded structure, and positioning pins and guide grooves are provided inside the interface. When connecting, just align the plug of the connector with the socket and gently push it in, and the positioning pins and guide grooves will automatically align and lock the position between the plug and the socket. This design simplifies the connection process and improves the reliability and safety of the connection. At the same time, the quick-connect connector also has the functions of preventing misinsertion and falling off, ensuring a stable connection state even in a harsh working environment.

[0039] The working process of this transformer is as follows:

[0040] Startup and connection: Construction workers carry the portable transformer to the designated position and place it stably using the portable bracket. The transformer is quickly and reliably connected to the power supply and load through the quick-connect connector.

[0041] Energy conversion: When alternating current is applied to the power supply side (primary winding), an alternating magnetic field is generated in the iron core. The alternating magnetic field is transmitted through the iron core to the secondary winding, thereby inducing an electromotive force in the secondary winding and achieving voltage transformation (step-up or step-down).

[0042] Heat dissipation protection: During operation, the transformer generates heat. The fan of the heat dissipation system starts, generating an air flow through the rotation of the fan blades, taking away the heat and dissipating it into the surrounding environment. The transformer oil in the portable oil tank also plays a role in heat dissipation. The oil circulates between the windings and the iron core, absorbing and carrying away the heat.

[0043] Stable operation: The electromagnetic shielding shell protects the inside of the transformer from external electromagnetic interference and reduces the electromagnetic radiation generated by itself. All components work together to ensure the stable operation of the transformer under rated load, while the monitoring and protection system is ready to respond to abnormal situations at any time.

[0044] Maintenance and mobility: Construction workers can regularly check the oil level in the oil tank through the observation window and replenish or replace the transformer oil through the oil inlet. When the transformer needs to be moved, it can be easily carried to a new location through the portable handle.

[0045] Among them, the transformer works based on the principle of electromagnetic induction. When alternating current is applied to the primary winding, an alternating magnetic field is generated in the iron core. This magnetic field is transmitted through the iron core to the secondary winding, thereby inducing an electromotive force in the secondary winding. The electrical energy in the primary winding is converted into magnetic field energy through electromagnetic induction and then into electrical energy in the secondary winding through magnetic field induction. In this process, voltage transformation and energy transmission are achieved. The heat generated inside the transformer is dissipated through the circulation of the heat dissipation system fan and the transformer oil, ensuring that the transformer operates within the allowable temperature range. The electromagnetic shielding shell and other safety devices protect the transformer from external interference and internal faults, ensuring the safe and stable operation of the transformer. The design of the portable bracket and the portable handle enables the transformer to be easily carried and installed at the construction site of the power engineering project, improving the flexibility and efficiency of the construction. Among them, pulleys can be installed at the bottom of the portable bracket for easy movement.

[0046] Furthermore, the iron core is made of cold-rolled high-permeability grain-oriented silicon steel sheets stacked together.

[0047] In a specific embodiment, the iron core, as the core component of the magnetic flux path, its performance directly affects the efficiency, loss and temperature rise of the transformer. The iron core made by stacking cold-rolled high-permeability grain-oriented silicon steel sheets integrates multiple advanced technical features, significantly improving the overall performance of the transformer. First of all, cold rolling refers to rolling the steel sheet at room temperature. By reducing the thickness of the steel sheet and improving its surface quality, the mechanical properties and electromagnetic properties of the material are improved. The cold rolling process can refine the grain structure of the steel sheet, reduce internal defects, and thus enhance the magnetic permeability of the silicon steel sheet. Secondly, this kind of silicon steel sheet is processed by a special process, so that the grains inside it form a highly ordered arrangement in the rolling direction, that is, the so-called "orientation". This orientation structure greatly improves the magnetic permeability of the silicon steel sheet in the rolling direction, while the magnetic permeability in the direction perpendicular to the rolling direction is relatively low. This characteristic enables the magnetic flux to flow more smoothly along the predetermined path under the action of the magnetic field in the iron core, reducing the magnetic resistance and magnetic leakage, and improving the energy conversion efficiency of the transformer. In addition, the iron core is composed of multiple high-permeability grain-oriented silicon steel sheets stacked together, and insulating paint or insulating paper is coated between each sheet to reduce eddy current loss. The stacking process ensures the tightness and consistency of the iron core, making the distribution of magnetic flux in the iron core more uniform, further reducing the magnetic resistance and magnetic leakage. At the same time, the stacking process also facilitates the manufacture and maintenance of the iron core, improving the production efficiency and the maintainability of the transformer.

[0048] When the portable transformer for power engineering construction is connected to the power supply and starts to work, the current in the primary winding generates an alternating magnetic field in the iron core through electromagnetic induction. Since the iron core is made by stacking cold-rolled high-permeability grain-oriented silicon steel sheets, the magnetic flux can flow efficiently along the predetermined path in the iron core and induce a corresponding electromotive force in the secondary winding, thus realizing the transformation of voltage and the transmission of energy. In this process, as the core component of the magnetic flux path, the high-efficiency magnetic permeability of the iron core ensures the smooth flow of magnetic flux and the effective conversion of energy.

[0049] Under normal working conditions, the magnetic flux density and magnetic field strength in the iron core are both maintained within a reasonable range, ensuring the stable operation of the transformer. Due to being made by stacking high-permeability grain-oriented silicon steel sheets, the losses of the iron core (including eddy current loss and hysteresis loss) are effectively controlled, reducing the temperature rise and energy consumption of the transformer. At the same time, the stacking process ensures the tightness and consistency of the iron core, reducing the local overheating phenomenon caused by uneven magnetic flux distribution, and further improving the reliability and service life of the transformer.

[0050] In specific implementation, the iron core made by stacking cold-rolled high-permeability grain-oriented silicon steel sheets has extremely high magnetic permeability, which can significantly reduce magnetic resistance and magnetic leakage, and improve the energy conversion efficiency of the transformer. In addition, due to the excellent magnetic permeability of the iron core and the effective control of losses, the eddy current loss and hysteresis loss of the transformer are significantly reduced, reducing the temperature rise and energy consumption of the transformer. Secondly, the stacking process ensures the tightness and consistency of the iron core, reduces the local overheating phenomenon caused by uneven magnetic flux distribution, and improves the stability and reliability of the transformer. At the same time, the cold-rolled high-permeability grain-oriented silicon steel sheets are easy to process and stack, improving the manufacturing efficiency and maintainability of the iron core. At the same time, the stacking process also facilitates local maintenance and replacement of the iron core.

[0051] Further, the electromagnetic shielding case 1 includes an outer shell layer, a shielding layer and a lining layer; the outer shell layer is made of the conductive metal material aluminum and serves as the first electromagnetic shielding layer; the shielding layer is made of copper material to serve as the second electromagnetic shielding layer to improve the electromagnetic shielding effect; the lining layer is made of plastic to avoid short circuits; the electromagnetic shielding case 1 adopts a segmented structure, including a top case, a side case and a bottom case; the top case covers the top of the transformer and is provided with a number of small holes; the top case is connected to the side case through a conductive sealing strip; the side case is connected to the bottom case through screws.

[0052] Further, the outer shell layer and the shielding layer are connected through a conductive adhesive; the shielding layer and the lining layer are connected through a non-conductive adhesive; the conductive adhesive adopts a silver epoxy resin adhesive, and the non-conductive adhesive adopts an epoxy resin adhesive.

[0053] In a specific embodiment, the electromagnetic shielding case 1 is composed of a housing layer, a shielding layer, and a lining layer, forming a multi-layer electromagnetic shielding system. The housing layer is made of the conductive metal material aluminum. Utilizing the high conductivity and good mechanical properties of aluminum, it serves as the first line of electromagnetic shielding defense to initially block the entry of external electromagnetic fields and the leakage of internal electromagnetic fields. The shielding layer is made of copper, which has better conductivity. The low resistivity characteristic of copper causes greater attenuation of electromagnetic waves when penetrating, further enhancing the electromagnetic shielding effect. The lining layer is made of insulating plastic, which not only avoids the short-circuit risk that may be caused by direct contact between metal layers but also provides additional mechanical support and protection. The electromagnetic shielding case 1 adopts a segmented design of a top case, a side case, and a bottom case. This design not only facilitates manufacturing, installation, and maintenance but also improves the adaptability and flexibility of the shielding case. The various sections of the case are tightly connected through specific connection methods (such as conductive sealing strips and screws) to ensure the continuity and integrity of electromagnetic shielding. A number of small holes are provided on the top case. Although they seemingly increase the risk of electromagnetic leakage, they are actually carefully designed to balance the heat dissipation requirements and the electromagnetic shielding effect. These small holes allow the heat generated inside the transformer to effectively dissipate, while controlling the electromagnetic leakage within an acceptable range through a reasonable aperture size and arrangement.

[0054] In the working state, the electromagnetic shielding shell 1 is an important component of the transformer, and its multi-layer shielding structure works together to form a solid electromagnetic protection barrier. When the transformer is running, the electromagnetic field generated inside is first blocked and attenuated by the aluminum material of the outer shell. Subsequently, the remaining electromagnetic energy enters the shielding layer and is further absorbed and dissipated by the copper material. The lining layer ensures the electrical isolation between the shielding layer and other components inside the transformer, preventing safety hazards such as short circuits. At the same time, the ingenious design of the segmented structure enables the electromagnetic shielding shell 1 to adapt to different working environments and installation conditions, ensuring the stability and reliability of the electromagnetic shielding effect. At the construction site of the power project, the portable transformer faces a complex and changeable electromagnetic environment. The introduction of the electromagnetic shielding shell 1 effectively reduces the electromagnetic interference of the transformer to the surrounding environment and protects the normal operation of other electrical equipment on site. At the same time, it also reduces the impact of the external electromagnetic field on the internal components of the transformer and improves the stability and reliability of the transformer. Specifically, the multi-layer shielding structure ensures the efficiency and comprehensiveness of the electromagnetic shielding effect; the segmented design improves the adaptability and maintainability of the shielding shell; the small hole design of the top shell takes into account the electromagnetic shielding effect while ensuring the heat dissipation requirements. These features make the electromagnetic shielding shell 1 one of the indispensable key components of portable transformers used in power engineering construction. Compared with similar hardware, the multi-layer shielding structure of the electromagnetic shielding shell 1 combined with high-quality conductive materials (aluminum and copper) provides excellent electromagnetic shielding effect, effectively reducing electromagnetic radiation leakage and electromagnetic interference. In addition, the small hole design of the top shell takes into account both the heat dissipation requirements and the electromagnetic shielding effect, ensuring the stable operation of the transformer in a high temperature environment. Secondly, the segmented structural design enables the electromagnetic shielding shell 1 to adapt to different working environments and installation conditions, thereby increasing its application range and flexibility. At the same time, the insulating plastic material of the inner lining layer avoids the risk of short circuits that may be caused by direct contact between metal layers, thereby improving the safety of the transformer.

[0055] Among them, the aperture size of the small holes in the top shell is 3 mm in diameter. While maintaining a good electromagnetic shielding effect, it allows sufficient air circulation for heat dissipation. This size is suitable for medium-power portable transformers, which can not only prevent the direct leakage of large electromagnetic waves but also effectively dissipate heat. There are a total of 64 holes arranged in an 8x8 rectangular array, that is, there are 8 holes in each row and each column. The center distance between the holes is 50 mm to ensure uniform heat dissipation and reduce the risk of local overheating. Through the rectangular array distribution, it can be ensured that the heat dissipation effect in each area of the top shell is basically the same. At the same time, the appropriate hole spacing helps to reduce the interference phenomenon caused by the interaction of electromagnetic waves between the small holes. The shape of the holes is circular. Circular holes are relatively simple to process and have a weak scattering effect on electromagnetic waves, which is beneficial to maintaining a good electromagnetic shielding effect. In addition, circular holes also have high structural strength and can withstand a certain amount of external pressure. Secondly, before implementation, the electromagnetic shielding effect and heat dissipation performance of the top shell are simulated through finite element analysis (FEA) software. The parameters such as aperture size, quantity, and distribution are adjusted until a design scheme that achieves the best heat dissipation effect under the premise of meeting the electromagnetic shielding requirements is found.

[0056] Furthermore, an observation window is provided outside the portable fuel tank 4; a pressure relief valve and an oil inlet are provided at the top of the portable fuel tank.

[0057] In a specific embodiment, the design of the portable fuel tank 4 is based on the principles of efficient heat dissipation, leak-proof sealing, and safety monitoring. The fuel tank is made of high-strength and corrosion-resistant stainless steel material to ensure durability and stability in harsh construction environments. The observation window provided on the outside of the fuel tank is made of tempered glass material, allowing operators to directly observe the oil level change and oil quality without opening the fuel tank, facilitating timely monitoring and maintenance. The pressure relief valve at the top of the fuel tank adopts a precise spring and sealing structure. When the internal pressure of the fuel tank exceeds the set threshold, the valve automatically opens to release the pressure, preventing the explosion risk caused by excessive internal pressure. At the same time, the inlet is equipped with a quick-connect device and a sealing gasket to ensure that the oil does not leak during the refueling process, and the operation is simple and fast. During the working process, the portable fuel tank 4 is first connected to an external oil source through the inlet, and the oil enters the interior of the fuel tank through the quick-connect device under the action of pressure. As the oil level rises, the oil level indicator in the observation window also rises, and the operator can judge whether the fuel tank is full accordingly. When the transformer is running, the transformer oil in the fuel tank plays the roles of insulation, cooling, and arc extinguishing, and takes away the heat through the oil circulation system to keep the temperature of the transformer within the normal range. If the internal pressure of the fuel tank rises due to rising oil temperature or other reasons and exceeds the set value of the pressure relief valve, the valve automatically opens to release the excess pressure, preventing the damage of the fuel tank or the occurrence of safety accidents. At the same time, the heat dissipation device (heat dissipation system fan) outside the fuel tank works together to further accelerate the cooling of the oil and improve the heat dissipation efficiency. The portable fuel tank 4 usually has two main working states in the construction of power engineering: standby state and running state. In the standby state, the fuel tank is filled with an appropriate amount of transformer oil, and all components are in a standby state, ready to be put into use at any time. At this time, the observation window can be used to regularly check the oil level and oil quality to ensure that the fuel tank is in good condition. In the running state, the transformer starts to work, and the transformer oil in the fuel tank circulates under the drive of the oil circulation system to take away the heat generated by the transformer. At the same time, the pressure relief valve monitors the internal pressure of the fuel tank in real time to ensure that it is within the safe range. If abnormal situations occur, such as too low oil level, too high oil temperature, etc., the corresponding alarm systems (such as low oil level alarm, over-temperature alarm) will issue warnings in a timely manner to remind the operator to take corresponding measures. Through the design of safety devices such as pressure relief valves and sealing gaskets, the risks of excessive internal pressure and oil leakage in the fuel tank are effectively prevented, improving the operation safety of the transformer. In addition, the heat dissipation device outside the fuel tank and the internal oil circulation system work together to achieve efficient heat dissipation, ensuring the stability and reliability of the transformer during long-term operation. Secondly, the design of the observation window enables the operator to check the oil level and oil quality without opening the fuel tank, simplifying the maintenance process. At the same time, the application of the quick-connect device and the sealing gasket also facilitates the operations of refueling and replacing the oil. At the same time, an intelligent monitoring system (such as an oil level sensor, a temperature sensor, etc.) can be integrated therein to realize the real-time monitoring and remote monitoring of the internal state of the fuel tank, improving the convenience and efficiency of construction management.

[0058] Further, the high-voltage and low-voltage windings are wound with flat copper wires; the high-voltage and low-voltage windings are connected to the quick-connect connector through internal terminals.

[0059] In a specific embodiment, the flat copper wires of the high-voltage and low-voltage windings have a larger surface area compared with traditional round copper wires. This means that in the same volume, the flat copper wires can dissipate heat more effectively, reducing the problem of insulation aging caused by excessive temperature rise. In addition, the structure of the flat copper wires also makes them easier to be closely arranged, reducing the gaps between the windings, improving the space utilization rate, and thus enhancing the power density of the transformer. The high-voltage and low-voltage windings are wound on the insulating skeleton with flat copper wires according to specific turns and layers through a precise winding process. During the winding process, the tightness of the windings, the interlayer insulation, and the turn-to-turn insulation need to be strictly controlled to ensure the electrical performance and mechanical strength of the windings. After winding, the high-voltage and low-voltage windings are connected to the quick-connect connector through internal terminals to achieve convenient connection with the external circuit. When the transformer is connected to the power grid and energized, the high-voltage and low-voltage windings, under the action of electromagnetic induction, realize the increase or decrease of voltage and complete the transmission and conversion of electrical energy. In the normal working state, the current in the high-voltage and low-voltage windings will generate heat. However, due to the use of flat copper wires for winding, their good heat dissipation performance effectively controls the winding temperature and keeps it within a safe range. At the same time, the insulating materials inside the windings also play a key role in isolation, preventing electrical breakdown between the high voltage and the low voltage and ensuring the safe operation of the transformer. In addition, the design of the quick-connect connector makes the connection between the windings and the external circuit more reliable and fast, improving the construction efficiency. In specific implementation, the winding with flat copper wires increases the heat dissipation area of the windings, reduces the temperature rise, and prolongs the service life of the transformer. In addition, the compact winding arrangement and optimized space utilization enable the transformer to output higher power in the same volume.

[0060] Further, the quick-connect connector 6 adopts a spring-loaded structure; positioning pins and guide grooves are arranged inside the interface of the quick-connect connector.

[0061] In a specific embodiment, the quick-connect connector 6 is based on the balance of precise mechanical fit and spring force. When the connector is inserted into the interface, the guiding groove first guides the connector to move along a predetermined trajectory until the positioning pin aligns with the corresponding hole position inside the interface. At this time, the spring-loading structure begins to function, and through the elastic force of the spring, it pushes the connector deeper into the interface until the positioning pin is fully inserted into the hole position and locked. During this process, the spring force not only provides the necessary insertion force but also ensures the tight contact between the connector and the interface, reduces the contact resistance, and improves the efficiency of electrical connection. In the normal working state, the quick-connect connector 6 maintains a stable connection state. Through the continuous action of the spring-loading structure, it resists the influence of adverse factors such as external vibration and impact, ensuring the continuity and reliability of electrical connection. At the same time, the precise fit between the positioning pin and the guiding groove also effectively prevents the connector from loosening or misaligning during long-term use. In addition, the quick-connect connector 6 also has the ability of quick plugging and unplugging. When disconnection is required, the connector can be easily pulled out by overcoming the resistance of the spring, improving the convenience of construction and maintenance. In specific implementation, the spring-loading structure enables the connector to be quickly inserted and locked onto the interface, and at the same time, it is also convenient for quick pulling out, greatly improving the construction efficiency. In addition, the precise fit between the positioning pin and the guiding groove ensures the accurate docking between the connector and the interface, reduces the contact resistance and the risk of loosening, and improves the reliability of electrical connection. Secondly, the spring-loading structure provides the connector with good seismic and shock resistance performance, enabling it to maintain a stable connection state in a harsh construction environment. At the same time, the design of the quick-connect connector makes the electrical connection more intuitive and simple, facilitating daily maintenance and fault troubleshooting.

[0062] Further, the cooling system fan 2 is connected to the power system of the transformer through an electric wire; the cooling system fan 2 is installed inside the transformer through a fixing bracket; the cooling system fan includes a fan blade, a motor, and a control circuit.

[0063] In a specific embodiment, the cooling system fan 2 mainly consists of three parts: a fan blade, a motor, and a control circuit. The motor converts electrical energy into mechanical energy to drive the fan blade to rotate and generate air flow. The design of the fan blade follows the principle of aerodynamics, aiming to maximize the air flow efficiency and reduce noise. The control circuit is responsible for receiving signals from the power system of the transformer and intelligently adjusting the rotation speed of the fan according to the temperature state of the transformer to achieve precise temperature control.

[0064] In a portable transformer for power engineering construction, the working mode of the cooling system fan 2 is highly automated and intelligent. First, the temperature sensor integrated inside the transformer monitors the temperature of the transformer in real time and transmits the data to the control circuit. The control circuit determines whether to start or adjust the fan speed according to the preset temperature threshold and algorithm logic. When the temperature of the transformer rises to the set threshold, the control circuit activates the motor, and the motor starts to rotate and drives the fan blades to rotate, generating a strong air flow. With the circulation of the air flow, the heat inside the transformer is effectively carried away, thereby reducing the temperature. At the same time, the control circuit will adjust the fan speed in real time according to the temperature change to keep the transformer working within the optimal temperature range. Under normal working conditions, the cooling system fan 2 is in a standby or running state. When the temperature of the transformer is within the safe range, the fan may run at a low speed or stop completely to save energy and reduce noise. Once the temperature exceeds the set threshold, the fan will start quickly and accelerate until the temperature drops to the safe level. During this process, the fan speed, air flow rate and noise level are all precisely controlled to ensure that both the heat dissipation requirements are met and the normal operation of the transformer is not affected. In specific implementation, by integrating the control circuit and the temperature sensor, the intelligent adjustment of the fan speed is realized, and precise control is carried out according to the actual temperature demand of the transformer, improving energy efficiency and extending the equipment life.

[0065] Furthermore, the portable support 5 is made of aluminum alloy material; the portable support 5 is fixedly connected to the transformer by bolts.

[0066] In a specific embodiment, through alloying treatment of the aluminum alloy, the strength and hardness of pure aluminum are improved, while maintaining a relatively low density, enabling the portable support to achieve a lightweight design while ensuring strength. In addition, a dense oxide film is easily formed on the surface of the aluminum alloy, which has good corrosion resistance and can adapt to the complex and changeable outdoor environment. During the installation process, first place the portable support on the ground according to the preset position, and then fix the transformer to the support by bolts. The tightening process of the bolts makes the support and the transformer form a tight contact, and the friction force generated by the pre-tightening force resists the external tensile and shear forces, thus ensuring the stability and safety of the transformer.

[0067] Under normal working conditions, the portable support 5 remains stationary and provides a stable support platform for the transformer. Its structural design and material selection ensure that the support can still maintain sufficient strength and stiffness when bearing the weight of the transformer and external environmental factors (such as wind load, temperature change, etc.), preventing deformation or damage. At the same time, the tightness of the bolt connection also ensures the firm connection between the transformer and the support, preventing loosening or falling off due to vibration or impact.

[0068] Although the specific embodiments of the present utility model have been described above, those skilled in the art should understand that these specific embodiments are merely illustrative. Without departing from the principles and essence of the present utility model, those skilled in the art can make various omissions, substitutions, and changes to the details of the above methods and systems. For example, combining the above method steps so as to perform substantially the same function in a substantially the same manner to achieve substantially the same result falls within the scope of the present utility model. Therefore, the scope of the present utility model is only defined by the appended claims.

Claims

1. A portable transformer for electric power engineering construction, characterized in that, It includes an electromagnetic shielding case, and at the center position inside the electromagnetic shielding case, there is an iron core; outside the iron core, high-voltage and low-voltage windings are sleeved in layers; the high-voltage and low-voltage windings include a primary winding and a secondary winding; the primary winding is sleeved around the center of the iron core; the secondary winding is located outside the primary winding; an electrical isolation layer is arranged between the primary winding, the secondary winding and the iron core; on one side of the electromagnetic shielding case, there is a heat dissipation system fan; the heat dissipation system fan is connected to the electromagnetic shielding case through a fixed bracket; above the heat dissipation system fan, there is a portable handle; on the other side of the electromagnetic shielding case, there is a portable fuel tank, the portable fuel tank is welded on the electromagnetic shielding case and is connected to the transformer through an oil pipeline; at the bottom of the electromagnetic shielding case, there is a portable bracket; at the four corners of the portable bracket, there are bolt locking devices; at the top of the electromagnetic shielding case, there is a quick connector, and the portable transformer is connected to the power supply and the load through the quick connector.

2. A portable transformer for use in electric power engineering construction according to claim 1, characterized in that: The iron core is made by stacking cold-rolled high-permeability grain-oriented silicon steel sheets.

3. A portable transformer for electric power engineering construction according to claim 1, characterized in that: The electromagnetic shielding case includes an outer shell layer, a shielding layer and a lining layer; the outer shell layer is made of the conductive metal material aluminum and serves as the first electromagnetic shielding layer; the shielding layer is made of copper material and serves as the second electromagnetic shielding layer to improve the electromagnetic shielding effect; the lining layer is made of plastic to avoid short circuits; the electromagnetic shielding case adopts a segmented structure, including a top shell, a side shell and a bottom shell; the top shell covers the top of the transformer and is provided with a number of small holes; the top shell is connected to the side shell through a conductive sealing strip; the side shell is connected to the bottom shell through screws.

4. A portable transformer for use in electric power engineering construction according to claim 3, characterized in that: The outer shell layer and the shielding layer are connected through a conductive adhesive; the shielding layer and the lining layer are connected through a non-conductive adhesive; the conductive adhesive adopts a silver epoxy resin adhesive, and the non-conductive adhesive adopts an epoxy resin adhesive.

5. A portable transformer for use in electric power engineering construction according to claim 1, characterized in that: An observation window is arranged outside the portable fuel tank; a pressure relief valve and an oil inlet are arranged at the top of the portable fuel tank.

6. A portable transformer for use in electric power engineering construction according to claim 1, characterized in that: The high-voltage and low-voltage windings are wound with flat copper wires; the high-voltage and low-voltage windings are connected to the quick connector through internal terminal posts.

7. A portable transformer for electric power engineering construction according to claim 1, wherein: The quick connector adopts a spring-loaded structure; positioning pins and guide grooves are arranged inside the interface of the quick connector.

8. A portable transformer for electric power engineering construction according to claim 1, characterized in that: The heat dissipation system fan is connected to the power supply system of the transformer through an electric wire; the heat dissipation system fan is installed inside the transformer through a fixed bracket; the heat dissipation system fan includes fan blades, a motor and a control circuit.

9. A portable transformer for electric power engineering construction according to claim 1, characterized in that: The portable bracket is made of aluminum alloy material; the portable bracket is fixedly connected to the transformer through bolts.

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