High-oil-cooled dual-voltage mobile de-icing rectifier transformer

Abstract

The application relates to a strong-oil cooling dual-voltage mobile ice-melting rectifier transformer, a low-voltage bushing, a high-voltage bushing and a dual-voltage switching switch which are arranged on a transformer body; the low-voltage bushing is connected with a low-voltage side winding in a transformer inner cavity of the transformer body, the high-voltage bushing is connected with a high-voltage side winding in the transformer inner cavity, and the dual-voltage switching switch is connected with the high-voltage side winding and used for switching a power supply voltage; a strong-oil air cooler is communicated with the transformer inner cavity through a cooler oil inlet pipe and a cooler oil outlet pipe, on one hand, oil leakage is not easy and various difficult road conditions transportation is suitable, and on the other hand, the strong-oil air cooler overcomes the oil leakage problem and the difficult transportation problem of the traditional self-cooling sheet structure transformer caused by oil moving transportation from the structure; under the same total amount and width, the external strong-oil air cooler not only improves the heat dissipation capacity, but also is beneficial to increasing the capacity of the transformer, compared with the traditional design, large-capacity miniaturization is realized, and the transformer has the advantages of convenient on-site power supply and wide application range.

Description

Technical Field

[0001] This application relates to the field of power transformers, and in particular to a forced oil-cooled dual-voltage mobile de-icing rectifier transformer. Background Technology

[0002] When low-temperature rain, snow and ice disasters occur, transmission lines may collapse due to severe icing, causing serious damage to power grid facilities. Therefore, power stations are equipped with de-icing transformers to address the impact of natural disasters on the safe operation of the power grid.

[0003] However, traditional fixed de-icing transformers lack flexibility and have limited use. They are mainly equipped in ultra-high voltage substations and cannot serve the entire power grid, especially small power grids. Furthermore, it is not possible to equip all substations of all sizes with a fixed de-icing transformer, as this would result in high investment costs and limited applicability. Therefore, mobile de-icing transformers are mainly used for low-voltage power grids, such as local power grid substations of 220kV and below.

[0004] Traditional mobile de-icing rectifier transformers use self-cooled finned radiators for cooling. The transformer must be transported as a whole, but the finned radiator structure is inherently unsuitable for transporting oil-filled equipment. Therefore, the traditional mobile de-icing rectifier transformer method has the following problems: First, the welds of the finned radiator are prone to cracking and leaking during transport vibrations; second, the dimensions of the self-cooled finned rectifier transformer easily exceed road transport requirements; and third, road width and height requirements limit the capacity of transformers using this structure.

[0005] Furthermore, when traditional mobile de-icing transformers are used on-site, the power supply is constrained by the local power grid. Summary of the Invention

[0006] Therefore, it is necessary to provide a powerful oil-cooled dual-voltage mobile ice-melting rectifier transformer.

[0007] One embodiment of this application is a forced oil-cooled dual-voltage mobile ice-melting rectifier transformer, which includes a transformer body, a low-voltage bushing, a high-voltage bushing, a dual-voltage switching switch, a forced oil-air cooler, a cooler inlet pipe and a cooler outlet pipe.

[0008] The low-voltage bushing, the high-voltage bushing, and the dual-voltage switching switch are respectively disposed on the transformer body;

[0009] The low-voltage bushing is connected to the low-voltage side winding in the transformer cavity of the transformer body, the high-voltage bushing is connected to the high-voltage side winding in the transformer cavity, and the dual-voltage switching switch is connected to the high-voltage side winding for switching the power supply voltage.

[0010] The forced oil-air cooler is connected to the transformer cavity through the cooler inlet pipe and the cooler outlet pipe.

[0011] The aforementioned oil-cooled dual-voltage mobile de-icing rectifier transformer, through the cooperation of the transformer body, low-voltage bushing, high-voltage bushing, dual-voltage transfer switch, oil-cooled air cooler, cooler inlet pipe, and cooler outlet pipe, achieves several advantages. Firstly, the external oil-cooled air cooler, in conjunction with the transformer body, replaces the traditional oil-lubricated finned radiator, which is prone to leakage during transport. This design reduces leakage and is suitable for transport in various challenging conditions, structurally overcoming the oil leakage and transportation difficulties associated with traditional self-cooled finned transformers. Secondly, within the same total size and width, the external oil-cooled air cooler not only improves heat dissipation but also increases the transformer's capacity, achieving a large capacity with a smaller size compared to traditional designs. Thirdly, the dual-voltage transfer switch, in conjunction with the transformer body, enables dual-voltage power supply, offering advantages such as convenient on-site power supply and wide applicability. Finally, the dual-voltage transfer switch, in conjunction with the transformer body, provides at least two voltage input modes, thus overcoming limitations in application scope.

[0012] In some embodiments, the forced oil-air cooler includes an oil pump, a fan, and a radiator;

[0013] The oil pump pumps the transformer oil in the transformer cavity into the radiator through the cooler inlet pipe, and sends the transformer oil into the transformer cavity through the cooler outlet pipe.

[0014] The fan blows air onto the surface of the radiator in a blower manner.

[0015] In some embodiments, the heat sink is attached to the transformer body or there is a gap between the heat sink and the transformer body.

[0016] In some embodiments, the forced oil-air cooler is disposed on the transformer body or located on one side of the transformer body.

[0017] In some embodiments, the high-voltage side winding includes a first high-voltage coil and a second high-voltage coil, and the low-voltage side winding includes a first low-voltage coil and a second low-voltage coil.

[0018] In some embodiments, the first high-voltage coil and the second high-voltage coil are located between the first low-voltage coil and the second low-voltage coil within the transformer cavity.

[0019] In some embodiments, the first high-voltage coil and the second high-voltage coil are connected in series, and the dual-voltage switching switch is connected to both ends and the middle series position respectively to achieve dual-voltage power supply.

[0020] In some embodiments, the first low-voltage coil is located between the magnetic core of the transformer body and the first high-voltage coil;

[0021] The second low-voltage coil is located between the second high-voltage coil and the tank wall of the transformer body.

[0022] In some embodiments, both the first low-voltage coil and the second low-voltage coil adopt a layered coil structure and are provided with at least two voltage levels.

[0023] In some embodiments, the forced oil-cooled dual-voltage mobile de-icing rectifier transformer further includes an oil conservator disposed on the transformer body, the oil conservator being connected to the transformer cavity of the transformer body. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of an embodiment of the oil-cooled dual-voltage mobile de-icing rectifier transformer described in this application.

[0026] Figure 2 for Figure 1 Another schematic diagram of the embodiment shown.

[0027] Figure 3 for Figure 2 Another schematic diagram of the embodiment shown.

[0028] Figure 4 for Figure 1 A schematic diagram of the coil arrangement in the embodiment shown.

[0029] Figure 5 for Figure 1 The dual-voltage schematic diagram of the high-voltage coil in the embodiment shown.

[0030] Reference numerals in the drawings: Transformer body 110, Transformer inner cavity 111, First high-voltage coil 112, Second high-voltage coil 113, First low-voltage coil 114, Second low-voltage coil 115, Magnetic core 116, Tank wall 117, Low-voltage bushing 120, First winding lead-out terminal 121, Second winding lead-out terminal 122, Third winding lead-out terminal 123, Fourth winding lead-out terminal 124, Fifth winding lead-out terminal 125, Sixth winding lead-out terminal 126, High-voltage bushing 130, Dual voltage switching switch 140, Forced oil-air cooler 150, Cooler inlet pipe 160, Cooler outlet pipe 170, Oil conservator 180. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0036] This application discloses a forced oil-cooled dual-voltage mobile de-icing rectifier transformer, which includes some or all of the technical features of the following embodiments; that is, the forced oil-cooled dual-voltage mobile de-icing rectifier transformer includes some or all of the following structures. In one embodiment of this application, a forced oil-cooled dual-voltage mobile de-icing rectifier transformer includes a transformer body, a low-voltage bushing, a high-voltage bushing, a forced oil-air cooler, a cooler inlet pipe, a cooler outlet pipe, and a dual-voltage switching switch; the low-voltage bushing, the high-voltage bushing, and the dual-voltage switching switch are respectively disposed on the transformer body; the low-voltage bushing is connected to the low-voltage side winding in the transformer cavity of the transformer body, the high-voltage bushing is connected to the high-voltage side winding in the transformer cavity, and the dual-voltage switching switch is connected to the high-voltage side winding for switching the supply voltage; the forced oil-air cooler is connected to the transformer cavity through the cooler inlet pipe and the cooler outlet pipe. The aforementioned oil-cooled dual-voltage mobile de-icing rectifier transformer, through the cooperation of the transformer body, low-voltage bushings, high-voltage bushings, a forced oil-air cooler, cooler inlet pipe, cooler outlet pipe, and a dual-voltage changeover switch, achieves several advantages. Firstly, the external forced oil-air cooler, in conjunction with the transformer body, replaces the traditional oil-lubricated plate radiator, which is prone to leakage during transport. This design reduces leakage and is suitable for transport in various challenging conditions, structurally overcoming the oil leakage and transportation difficulties associated with traditional self-cooled plate radiator transformers. Secondly, within the same total weight and width, the external forced oil-air cooler not only improves heat dissipation but also increases the transformer's capacity, achieving a large capacity with a smaller size compared to traditional designs. Furthermore, the dual-voltage changeover switch, in conjunction with the transformer body, enables dual-voltage power supply, offering advantages such as convenient on-site power supply and wide applicability. Finally, the dual-voltage changeover switch, in conjunction with the transformer body, provides at least two voltage input modes, thus overcoming limitations in application scope. The following section will further elaborate on this point. Figures 1 to 5 The oil-cooled dual-voltage mobile ice-melting rectifier transformer is described in detail.

[0037] In some embodiments, a forced oil-cooled dual-voltage mobile ice-melting rectifier transformer 100 is as follows: Figure 1 and Figure 2As shown, it includes a transformer body 110, a low-voltage bushing 120, a high-voltage bushing 130, a dual-voltage switching switch 140, a forced oil-air cooler 150, a cooler inlet pipe 160, and a cooler outlet pipe 170; wherein, the forced oil-air cooler 150 is also called a forced oil circulation air-cooled cooler, or OFAF for short. As an example, the low-voltage bushing 120 and the high-voltage bushing 130 respectively serve as winding connections, the dual-voltage switching switch 140 serves as a selection function for switching between at least two voltages, and the forced oil-air cooler 150, through the cooler inlet pipe 160 and the cooler outlet pipe 170, serves to dissipate heat and cool the transformer oil. Furthermore, the low-voltage bushing 120, the high-voltage bushing 130, and the dual-voltage switching switch 140 are respectively disposed on the transformer body 110; the low-voltage bushing 120 is connected to the low-voltage side winding in the transformer cavity 111 of the transformer body 110, the high-voltage bushing 130 is connected to the high-voltage side winding in the transformer cavity 111, and the dual-voltage switching switch 140 is connected to the high-voltage side winding for switching the power supply voltage; the forced oil-air cooler 150 is connected to the transformer cavity 111 through the cooler oil inlet pipe 160 and the cooler oil outlet pipe 170 respectively.

[0038] This design, through the cooperation of the transformer body 110, low-voltage bushing 120, high-voltage bushing 130, dual-voltage switching switch 140, forced oil-air cooler 150, cooler oil inlet pipe 160, and cooler oil outlet pipe 170, achieves several advantages. First, the external forced oil-air cooler 150, in conjunction with the transformer body 110, replaces the traditional oil-leaking plate radiator, which is prone to oil leakage during transport. This design is less prone to oil leakage and suitable for transport in various difficult road conditions, structurally overcoming the oil leakage and transportation difficulties caused by the oil-laden transport of traditional self-cooled plate radiators. Second, with the same total size and width, the external forced oil-air cooler 150 not only improves the heat dissipation capacity of the transformer body 110 but also helps to increase the transformer capacity, achieving a large capacity and small size compared to traditional designs. Third, the dual-voltage switching switch 140, in conjunction with the transformer body 110, enables dual-voltage power supply, offering advantages such as convenient on-site power supply and wide applicability. Fourth, the dual-voltage switching switch 140, in conjunction with the transformer body 110, provides at least two voltage input modes, thus overcoming the limitation on the scope of use.

[0039] To facilitate adjustment of the volume change of the transformer oil in the tank, in some embodiments, the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 further includes an oil conservator 180 disposed on the transformer body 110. The oil conservator 180 is also called an oil pillow, and it is connected to the transformer cavity 111 of the transformer body 110. When the transformer is running, the heat generated during operation causes the temperature of the transformer oil, i.e., the insulating oil, to rise and its volume to expand. When the transformer stops running or the load is reduced, the temperature of the transformer oil drops and its volume to shrink. The oil conservator 180, through its own volume space, accommodates the expanding oil and replenishes it to the transformer body 110, i.e., the tank, in a timely manner when the oil shrinks, to ensure the sealing and structural safety of the transformer body 110.

[0040] This design has several advantages. First, the oil conservator 180, connected to the transformer body 110 via the transformer cavity 111, adapts in real time to the thermal expansion and contraction of the transformer oil, preventing abnormal pressure within the tank due to changes in oil volume. This fundamentally ensures the sealing and structural safety of the transformer body 110, overcoming the problem of leakage or component damage caused by oil volume fluctuations in traditional transformers. Second, the integrated design of the oil conservator 180 requires minimal additional space and is compatible with the external structure of the forced oil-air cooler 150, without affecting the overall miniaturized layout of the equipment. This ensures the transformer maintains structural stability even during transportation in challenging conditions. Third, this design keeps the transformer oil in a closed-loop regulation state, reducing contact with air and lowering the risk of oil oxidation and deterioration. Combined with the voltage adaptation function of the dual-voltage switching switch 140, this further enhances the operational reliability and environmental adaptability of the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100, broadening its application scenarios under different operating conditions.

[0041] In various embodiments, the low-voltage bushing 120 is disposed on the transformer body 110, and the low-voltage bushing 120 connects to the low-voltage side winding in the transformer cavity 111 of the transformer body 110, that is, the low-voltage side winding in the transformer body 110 is connected to an external power line through the low-voltage bushing 120. As an example, the low-voltage bushing 120 includes multiple low-voltage winding lead-out terminals. In some embodiments, such as... Figure 3 As shown, the low-voltage bushing 120 includes a first winding lead-out terminal 121, a second winding lead-out terminal 122, a third winding lead-out terminal 123, a fourth winding lead-out terminal 124, a fifth winding lead-out terminal 125, and a sixth winding lead-out terminal 126, which are respectively connected to different positions of the low-voltage side winding or to different low-voltage side windings. As an example, combined with... Figure 2 , Figure 3 and Figure 4The first lead-out terminal 121, the third lead-out terminal 123, and the fifth lead-out terminal 125 of the winding are respectively connected to the beginning of the first low-voltage coil 114 of the three-phase winding, corresponding to phase A, phase B, and phase C of the three-phase AC power, respectively; the second lead-out terminal 122, the fourth lead-out terminal 124, and the sixth lead-out terminal 126 of the winding are respectively connected to the beginning of the second low-voltage coil 115 of the three-phase winding, corresponding to phase A, phase B, and phase C of the three-phase AC power, respectively.

[0042] The following will continue to combine Figure 2 , Figure 3 and Figure 4 The above embodiments will be described. In some embodiments, the low-voltage bushing 120 is disposed on the transformer body 110, with one end extending into the transformer cavity 111 of the transformer body 110 to establish a reliable connection with the internal low-voltage winding, and the other end used to connect to an external power line to achieve stable transmission of low-voltage power, constituting a key connection hub between the transformer body 110 and the external circuit. As an example, the low-voltage bushing 120 is configured with multiple low-voltage winding lead-out terminals to adapt to diverse connection requirements, such as a first winding lead-out terminal 121, a second winding lead-out terminal 122, a third winding lead-out terminal 123, a fourth winding lead-out terminal 124, a fifth winding lead-out terminal 125, and a sixth winding lead-out terminal 126, which can be connected to different positions of the low-voltage winding or different low-voltage windings according to actual operating conditions. The first lead-out terminal 121, the third lead-out terminal 123, and the fifth lead-out terminal 125 of the winding are respectively connected to the beginning of the first low-voltage coil 114 in the three-phase winding, and are respectively matched to the A phase, B phase, and C phase of the three-phase AC power; the second lead-out terminal 122, the fourth lead-out terminal 124, and the sixth lead-out terminal 126 of the winding are respectively connected to the beginning of the second low-voltage coil 115 in the three-phase winding, and are also respectively matched to the A phase, B phase, and C phase of the three-phase AC power, ensuring the orderly connection of the three-phase power supply.

[0043] This design serves two purposes. First, the low-voltage bushing 120, as a key connection component between the low-voltage side winding of the transformer body 110 and the external power line, ensures stable output of low-voltage side power, guaranteeing reliable connection between the oil-cooled dual-voltage mobile de-icing rectifier transformer 100 and the external circuit, overcoming the problems of loosening and poor contact inherent in traditional connection structures. Second, its multiple low-voltage winding leads allow for flexible connection to different positions or different low-voltage side windings. Combined with the high-voltage regulation function of the dual-voltage switching switch 140, it further expands voltage adaptability. The range of applications meets the low-voltage power supply needs in different scenarios, improving the equipment's versatility. Furthermore, the three-phase grouped terminal layout clearly defines the corresponding connections for A, B, and C phase AC power, simplifying on-site wiring operations, improving installation efficiency, reducing the risk of wiring errors, and ensuring the balanced stability of the three-phase power supply. Simultaneously, the multi-terminal design provides space for future functional expansion or operating condition adjustments, and combined with the efficient heat dissipation of the 150-type forced-oil-air cooler, the transformer can maintain stable operation under complex conditions, further enhancing the equipment's practicality and ease of transmission.

[0044] In each embodiment, the high-voltage bushing 130 is disposed on the transformer body 110, and the high-voltage bushing 130 connects to the high-voltage side winding in the transformer cavity 111, that is, the high-voltage side winding in the transformer body 110 is connected to the external power line through the high-voltage bushing 130. As an example, such as... Figure 2 and Figure 5 As shown, the three high-voltage bushings 130 are respectively connected to the beginning of the high-voltage side of the three-phase winding, corresponding to phases A, B, and C of the three-phase AC power supply. It can be understood that... Figure 5 As shown, A1, B1, C1 and A2, B2, C2 correspond to the high-voltage side windings, while Figure 2 The A1, B1, C1 and A2, B2, C2 shown correspond to the low-voltage side windings.

[0045] This design serves several purposes. First, the high-voltage bushing 130, as the core connection component between the high-voltage winding of the transformer body 110 and the external power line, ensures stable transmission of high-voltage power and guarantees reliable connection of the high-voltage side of the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100, overcoming the problems of insulation breakdown and poor contact that are common in traditional high-voltage connections. Second, the three high-voltage bushings 130 correspond to the grouping layout of the three-phase AC A, B, and C phases, respectively, with clear wiring logic, simplifying on-site installation and reducing the risk of wiring errors, ensuring the balanced and stable three-phase power supply. Third, in conjunction with the dual-voltage switching switch 140, it provides a stable connection basis for high-voltage side voltage switching, facilitating the efficient realization of dual-voltage power supply function and further expanding the applicable scenarios of the equipment. At the same time, the design of integrating the high-voltage bushing 130 into the transformer body 110 does not affect the overall miniaturization of the equipment or the convenience of transportation in difficult road conditions. Combined with the heat dissipation advantages of the forced oil-cooled air cooler 150, it improves the safety and reliability of the equipment operation.

[0046] Considering the wide low-voltage output range of transformers, and the fact that traditional high-voltage flux regulation results in a transformer impedance range much larger than the low-voltage regulation range, even low-voltage constant flux regulation can only solve the problem of large impedance variations in high-voltage flux regulation. However, due to the large impedance variation range of power transformers, the problem of large impedance variations still needs to be addressed. As an example, the low-voltage side winding, i.e., the low-voltage coil, includes a first low-voltage coil 114 and a second low-voltage coil 115, and the high-voltage side winding, i.e., the high-voltage coil, is disposed between the first low-voltage coil 114 and the second low-voltage coil 115. In some embodiments, such as... Figure 4 As shown, the high-voltage side winding includes a first high-voltage coil 112 and a second high-voltage coil 113, and the low-voltage side winding includes a first low-voltage coil 114 and a second low-voltage coil 115. In some embodiments, the first high-voltage coil 112 and the second high-voltage coil 113 are located between the first low-voltage coil 114 and the second low-voltage coil 115 within the transformer cavity 111. In some embodiments, the first low-voltage coil 114 is located between the magnetic core 116 of the transformer body 110 and the first high-voltage coil 112; the second low-voltage coil 115 is located between the second high-voltage coil 113 and the tank wall 117 of the transformer body 110. As an example, from the magnetic core 116, for example, the core side, to the tank wall 117, the sequence is: first low-voltage coil 114, first high-voltage coil 112, for example, a 10kV high-voltage coil, second high-voltage coil 113, for example, a 35kV high-voltage coil, second low-voltage coil 115, and tank wall 117.

[0047] Compared to traditional designs, this embodiment splits the low-voltage side winding into two coils, placed on the innermost and outermost sides respectively. This results in tighter coupling between the low-voltage and high-voltage coils, which helps reduce the transformer impedance variation range. As an example, a test control scheme is used to illustrate this: For transformers with the same scheme, the impedance variation range of a transformer using one low-voltage coil is 7.9% to 22.29%. The impedance variation range of the transformer using the above embodiment, with the high-voltage coil located between the two low-voltage coils, is 4.45% to 11.85%. Other test examples show impedance variation ranges of 4.42% to 7.84%. In other control schemes, the impedance variation range of a mobile de-icing rectifier transformer using one low-voltage coil is 8.8% to 19.16%. The impedance variation range of the transformer using the above embodiment, with the high-voltage coil located between the two low-voltage coils, is approximately 5.28% to 10.06%.

[0048] Moreover, this design gives the oil-cooled dual-voltage mobile ice-melting rectifier transformer the advantage of small impedance variation. Therefore, it can also be called an oil-cooled dual-voltage mobile ice-melting rectifier transformer with small impedance variation. By rationally arranging the internal and external structures of the transformer and improving the cooling method, it can meet all the performance and functional requirements of transformers, especially vehicle-mounted transformers, while making them small in size, light in weight, with a small impedance variation range, wide applicability, low probability of oil leakage, and high product quality.

[0049] In some embodiments, both the first low-voltage coil 114 and the second low-voltage coil 115 adopt a layered coil structure and are provided with at least two taps. As an example, the low-voltage coils, including the first low-voltage coil 114 and the second low-voltage coil 115, adopt a layered coil tap structure, with each coil having three taps. The specific positions can be set according to the actual user's required output voltage. The forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 is provided with a six-position tap switch, which is respectively connected to the first low-voltage coil 114 and the second low-voltage coil 115. By adjusting this tap switch, different voltage outputs of the transformer can be adjusted.

[0050] In some embodiments, both the first low-voltage coil 114 and the second low-voltage coil 115 are formed using a layered winding process, possessing the characteristics of simple and flexible structure and uniform heat dissipation. Both are also equipped with a multi-level adjustment mechanism to adapt to different voltage output requirements. As an example, both low-voltage coils adopt a layered tap design, with each coil corresponding to two or three customizable tap positions. The specific tap positions can be precisely set according to the user's actual required output voltage parameters. Correspondingly, the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 is equipped with a four-level or six-level tap switch. This tap switch is connected to the corresponding terminals of the first low-voltage coil 114 and the second low-voltage coil 115 to form a multi-level voltage adjustment circuit. Operators can precisely control the transformer's output voltage by switching the tap switch levels to meet diverse power consumption needs.

[0051] As an example, to ensure a small impedance variation range, the low-voltage coil is split into two and placed on the inner and outer sides of the high-voltage coil respectively. In some embodiments, both the first low-voltage coil 114 and the second low-voltage coil 115 adopt a layered coil tap structure. For example, the six positions of a six-position tap switch are 1095V, 1684V, 2189V, 2905V, 3494V, and 3999V, respectively. The specific number of positions and low-voltage values ​​can be set according to actual needs.

[0052] This design, on the one hand, employs a layered coil tap structure for the first low-voltage coil 114 and the second low-voltage coil 115, combined with a six-position tap switch to achieve multi-position voltage output, covering a voltage range from 1095V to 3999V. Furthermore, the number of positions and output voltage can be customized as needed, significantly expanding the voltage adaptability of the oil-cooled dual-voltage mobile ice-melting rectifier transformer 100 and meeting the precise power supply requirements in different scenarios. On the other hand, splitting the low-voltage coil into two and placing them inside and outside the high-voltage coil effectively controls the impedance variation range, ensuring the stability of transformer operation and power transmission efficiency, overcoming the large impedance fluctuations and impact on power supply quality inherent in traditional coil layouts. The issue of quantity; on the other hand, the layered coil structure has the advantages of uniform heat dissipation and simple manufacturing. Combined with the efficient heat dissipation system of the forced oil air cooler 150, it further improves the operational reliability of the equipment under high load conditions and extends the service life of the coil; on the other hand, the six-position tap changer and the dual voltage switching switch 140 form a coordinated adjustment mechanism, which not only realizes the high-voltage side voltage switching, but also enables the equipment to have both wide range adaptability and high precision adjustment. At the same time, the coil tap structure design is simple and easy to operate, reducing on-site debugging and maintenance costs. Combined with the overall miniaturization and easy transportation characteristics of the equipment, it further enhances the practicality of the forced oil cooling dual voltage mobile de-icing rectifier transformer 100.

[0053] As an example, the input voltage of the first high-voltage coil 112 is lower than the input voltage of the second high-voltage coil 113. As an example, such as... Figure 5 As shown, the input voltage of the first high-voltage coil 112 is 10KV, and the input voltage of the second high-voltage coil 113 is 25KV. In actual products, the input voltages of the first high-voltage coil 112 and the second high-voltage coil 113 can be other voltage values. As an example, a switching control switch is provided between the first high-voltage coil 112 and the second high-voltage coil 113 as the dual-voltage switching switch 140. When the switching control switch is open, the input voltage of the high-voltage side winding is the input voltage of the first high-voltage coil 112, for example, 10KV. When the switching control switch is closed, the input voltage of the high-voltage side winding is the combined voltage of the first high-voltage coil 112 and the second high-voltage coil 113, for example, 35KV.

[0054] In some embodiments, the high-voltage side winding of the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 includes two independent coil units, namely a first high-voltage coil 112 and a second high-voltage coil 113, which are configured with different input voltage specifications, and the rated input voltage of the first high-voltage coil 112 is lower than that of the second high-voltage coil 113. As an example, such as Figure 5 As shown, the first high-voltage coil 112 can be configured with a 10KV input specification, and the second high-voltage coil 113 can be configured with 25KV to provide a 35KV input specification. In practical applications, the voltage parameters of the two sets of coils can be flexibly adjusted and adapted according to the needs of different power scenarios. To achieve dual-voltage mode switching, the two sets of high-voltage coils are connected in series and equipped with a switching control switch as a dual-voltage switching switch 140: when the switching control switch is in the open state, the high-voltage side winding only receives a voltage of 10KV through the first high-voltage coil 112; when the switching control switch is closed, the first high-voltage coil 112 and the second high-voltage coil 113 form a series cooperative working state, and the high-voltage side winding outputs the total voltage of the two superimposed, such as 35KV, to meet the power supply requirements of different voltage levels.

[0055] This design allows for flexible input voltage settings for the first high-voltage coil 112 and the second high-voltage coil 113, combined with the on / off control of the dual-voltage switching switch 140. This enables flexible input of either 10KV or 35KV from the power grid, meeting the high-voltage power supply needs of different scenarios and overcoming the limitation of the application range of traditional single-voltage transformers. Furthermore, the simplified operation mode of the switching control switch makes on-site voltage switching convenient and efficient, eliminating the need for complex debugging procedures and enhancing the on-site adaptability of the forced-oil-cooled dual-voltage mobile de-icing rectifier transformer 100. Additionally, the independent design and superimposed working mode of the dual coils ensure the stability and accuracy of the voltage output, further reducing the risk of power supply failures when combined with the reliable connection of the high-voltage bushing 130. Simultaneously, this structure is compatible with the efficient heat dissipation of the forced-oil-air cooler 150 and the overall miniaturized design of the equipment, ensuring convenient transportation under difficult road conditions. Moreover, the voltage levels can be customized as needed, significantly expanding the application range of the equipment in different voltage-level power scenarios.

[0056] The following is a brief explanation of the principle of the oil-cooled dual-voltage mobile de-icing rectifier transformer described in the above embodiments: The high-voltage coil adopts a two-series structure, and a voltage regulating switch is added to achieve tap switching, meeting the requirements of flexible dual-voltage power supply, and enabling 10kV and 35kV voltage input. In contrast, traditional self-cooled de-icing rectifier transformers rely on self-cooling, which has limited cooling effect; the cooler uses a plate-type radiator, which is prone to oil leakage during transportation; the impedance variation range is 8.8% to 19.16%; and the high-voltage power supply is either 10kV or 35kV, allowing only one power source to be used. The aforementioned oil-cooled dual-voltage mobile de-icing rectifier transformer employs a forced oil-air cooling method, resulting in strong cooling capacity. The cooler utilizes forced oil-air cooling, minimizing oil leakage and ensuring high quality. Its impedance variation range is 4.42% to 7.84%, smaller than traditional solutions, thus providing high voltage adjustment accuracy. This improves operational stability, reduces voltage fluctuations, optimizes power supply quality, and simplifies grid control. It supports both 10kV and 35kV high-voltage power supply, allowing the use of both power sources. Under the same transport dimensions and weight requirements, it offers a larger capacity compared to traditional self-cooled de-icing rectifier transformers. In other embodiments of this application, two high-voltage coils can be used, with an additional tap changer (i.e., a switching control switch) serving as the dual-voltage switching switch 140. This connects a 10kV coil and a 35kV coil in series, meaning the high-voltage coils are connected in series. By adding a switch, dual-voltage power supply (10kV and 35kV) is achieved through connection to an external bushing, providing convenient on-site power supply and broad applicability.

[0057] In various embodiments, the dual-voltage switching switch 140 is disposed on the transformer body 110 and connected to the high-voltage side winding for switching the supply voltage. In some embodiments, the first high-voltage coil 112 and the second high-voltage coil 113 are connected in series, and the dual-voltage switching switch 140 is connected to both ends and the middle series connection position respectively to achieve dual-voltage power supply.

[0058] This design offers several advantages. First, the dual-voltage switching switch 140 is directly integrated into the transformer body 110, precisely connecting with the first high-voltage coil 112 and the second high-voltage coil 113, which are connected in series. By switching the connection between the two ends and the intermediate series position, dual-voltage power supply is efficiently achieved. This design is convenient to operate and has a rapid switching response, overcoming the problems of complex structure and cumbersome debugging of traditional voltage regulation devices. Second, its dedicated series structure adapted to the high-voltage side winding ensures the stability of power supply during voltage switching, preventing voltage fluctuations from impacting the oil-cooled dual-voltage mobile de-icing rectifier transformer 100 and external circuits, thus improving power supply reliability. Third, the dual-voltage mode further broadens the applicable scenarios of the equipment, flexibly adapting to power demands of different voltage levels. Combined with the efficient heat dissipation of the oil-cooled air cooler 150 and the advantages of equipment miniaturization, it does not affect the convenience of transportation in difficult road conditions. At the same time, the switch structure is compact, does not occupy too much extra space, and is highly compatible with the overall transformer structure, which is conducive to achieving the design goal of large capacity and small size.

[0059] To fundamentally address the quality issue of oil leakage during the transportation of traditional mobile de-icing rectifier transformers, in each embodiment, the forced oil-air cooler 150 is connected to the transformer's inner cavity 111 via the cooler inlet pipe 160 and the cooler outlet pipe 170. This design improves the mobile de-icing rectifier transformer by changing the cooling method from self-cooling to forced oil-air cooling. The use of a forced oil-air cooler eliminates the need for leaky plate radiators during transport, allowing for separate transportation and preventing oil leakage. Furthermore, the forced oil cooler method allows for a further increase in transformer capacity within the same total dimensions and width, or the realization of a large-capacity, miniaturized form factor.

[0060] In some embodiments, the forced oil-air cooler 150 is equipped with an oil pump, a fan, and a radiator. The oil pump pumps transformer oil from the transformer cavity 111 into the radiator through the cooler's oil inlet pipe 160, and then delivers the transformer oil into the transformer cavity 111 through the cooler's oil outlet pipe 170. The fan blows air onto the surface of the radiator. This design, with the oil pump forcibly driving the transformer oil circulation and the fan forcibly ventilating, facilitates efficient heat dissipation during transformer operation.

[0061] This design, on the one hand, connects the forced oil cooler 150 to the transformer's inner cavity 111 via the cooler inlet pipe 160 and the cooler outlet pipe 170, employing a separate transportation and assembly oiling mode. This completely eliminates the traditional easily leaking plate-type radiator, fundamentally preventing the oil leakage hazard during the transportation of the forced oil-cooled dual-voltage mobile ice-melting rectifier transformer 100. It perfectly adapts to the transportation needs of difficult road conditions and overcomes the core pain point of transporting traditional self-cooled transformers with oil. On the other hand, the dual design of forced circulation by the oil pump and forced air cooling by the fan constructs a highly efficient heat dissipation system. Compared to traditional self-cooling methods, the system significantly improves heat dissipation efficiency, allowing for further increases in transformer capacity within the same total volume and width, or achieving large-capacity miniaturization, balancing performance and portability. Furthermore, the independent modular design of the forced oil-air cooling system facilitates individual inspection and maintenance of cooling components, reducing operation and maintenance costs, while preserving the sealing of the transformer body 110. Combined with the wide adaptability of the dual-voltage switching switch 140, the equipment can maintain stable operation even under high loads, further expanding its application range in different de-icing scenarios and power supply applications.

[0062] In some embodiments, a gap exists between the radiator and the transformer body 110 to dissipate heat from both the transformer oil inside the radiator and the casing of the transformer body 110, i.e., the tank wall 117, through air convection. Alternatively, in some embodiments, the radiator is attached to the transformer body 110, using contact conduction combined with air convection to dissipate heat from both the transformer oil and the tank wall 117.

[0063] This design offers several advantages. First, the radiator and transformer body 110 can be flexibly integrated with each other, using either a gap-like or flush-fitting configuration. This dual heat dissipation path—either through air convection or a combination of contact conduction and air convection—ensures efficient cooling of the transformer oil within the forced-oil air cooler 150 while simultaneously dissipating heat from the tank wall 117, significantly improving the overall heat dissipation efficiency of the forced-oil-cooled dual-voltage mobile de-icing rectifier transformer 100. Second, the gap-like configuration avoids direct compression between the radiator and the body, reducing collision damage during transport, while the flush-fitting configuration optimizes space utilization. Both configurations are suitable for miniaturized equipment and transport in challenging conditions without compromising structural stability. Third, the dual heat dissipation design further reduces the transformer's operating temperature. Combined with the forced oil circulation of the oil pump, this provides reliable protection for high-capacity operation. It also aligns with the wide adaptability of the dual-voltage switching switch 140, allowing the equipment to operate stably under different loads and voltage conditions, effectively extending the service life of the transformer body 110 and its components.

[0064] The location of the forced oil-air cooler 150 can be flexibly designed. In some embodiments, the forced oil-air cooler 150 is disposed on the transformer body 110; or, in some embodiments, the forced oil-air cooler 150 is located on one side of the transformer body 110. As an example, part of the forced oil-air cooler 150 is located on one side of the transformer body 110, and another part is located in the transformer cavity 111. As an example, the forced oil-air cooling method is used, and it is arranged at the end of the transformer, which significantly reduces the width and weight of the transformer, increases the capacity of the transformer, and improves the quality of the transformer to reduce the probability of oil leakage. This makes the forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 have advantages such as high quality, large capacity, small impedance variation range, good performance, dual voltage power supply, and wide adaptability.

[0065] In some of these embodiments, such as Figure 1 and Figure 2 As shown, a forced oil-cooled dual-voltage mobile de-icing rectifier transformer 100 includes a transformer body 110, a low-voltage bushing 120, a high-voltage bushing 130, a dual-voltage switching switch 140, a forced oil-air cooler 150, a cooler inlet pipe 160, a cooler outlet pipe 170, and an oil conservator 180; the low-voltage bushing 120, the high-voltage bushing 130, the dual-voltage switching switch 140, and the oil conservator 180 are respectively disposed on the transformer body 110; combined with Figure 4 The low-voltage bushing 120 is connected to the low-voltage side winding in the transformer cavity 111 of the transformer body 110, and the high-voltage bushing 130 is connected to the high-voltage side winding in the transformer cavity 111. The dual-voltage switching switch 140 is connected to the high-voltage side winding and is used to switch the power supply voltage. The oil conservator 180 is connected to the transformer cavity 111 of the transformer body 110, and the forced oil-air cooler 150 is connected to the transformer cavity 111 through the cooler inlet pipe 160 and the cooler outlet pipe 170, respectively. 1. The forced oil-air cooler 150 is equipped with an oil pump, a fan, and a radiator; the oil pump, the fan, and the radiator are all located on one side of the transformer body 110, and there is a gap between the radiator and the transformer body 110. The oil pump pumps the transformer oil in the transformer cavity 111 into the radiator through the cooler oil inlet pipe 160, and sends the transformer oil into the transformer cavity 111 through the cooler oil outlet pipe 170; the fan blows air onto the surface of the radiator in a blower manner.

[0066] Combination Figure 4 and Figure 5The high-voltage side winding includes a first high-voltage coil 112 and a second high-voltage coil 113, and the low-voltage side winding includes a first low-voltage coil 114 and a second low-voltage coil 115. Both the first low-voltage coil 114 and the second low-voltage coil 115 adopt a layered coil structure and are provided with at least two positions. In the transformer cavity 111, the first high-voltage coil 112 and the second high-voltage coil 113 are located between the first low-voltage coil 114 and the second low-voltage coil 115. The first high-voltage coil 112 and the second high-voltage coil 113 are connected in series, and the dual-voltage switching switch 140 is connected to both ends and the middle series position to achieve dual-voltage power supply. The first low-voltage coil 114 is located between the magnetic core 116 of the transformer body 110 and the first high-voltage coil 112. The second low-voltage coil 115 is located between the second high-voltage coil 113 and the tank wall 117 of the transformer body 110. Other embodiments follow the same principle and will not be described in detail.

[0067] This integrated design ensures precise matching and collaborative operation of core components. The dual-voltage switching switch 140, in conjunction with the series-connected first high-voltage coil 112 and second high-voltage coil 113, enables flexible voltage switching. The layered structure of the first low-voltage coil 114 and second low-voltage coil 115 guarantees accurate voltage regulation, significantly expanding the equipment's compatibility. Furthermore, the oil pump and forced-oil air cooler 150 create an efficient heat dissipation cycle. The gap design between the radiator and the transformer body 110 enhances air convection, and combined with the oil regulation function of the oil conservator 180, comprehensively ensures stable equipment operation. Finally, the layered coil layout optimizes magnetic field distribution, reducing energy loss. The integration of all components into the transformer body 110 balances miniaturization and leak-proof design, making it suitable for transportation in challenging road conditions and improving the reliability and compatibility of the forced-oil-cooled dual-voltage mobile de-icing rectifier transformer 100.

[0068] It should be noted that other embodiments of this application also include an oil-cooled dual-voltage mobile ice-melting rectifier transformer formed by combining the technical features of the above embodiments.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A powerful oil-cooled dual-voltage mobile ice-melting rectifier transformer (100), characterized in that, It includes the transformer body (110), low-voltage bushing (120), high-voltage bushing (130), dual voltage switching switch (140), forced oil-air cooler (150), cooler inlet pipe (160) and cooler outlet pipe (170). The low-voltage bushing (120), the high-voltage bushing (130), and the dual-voltage switching switch (140) are respectively disposed on the transformer body (110); The low-voltage bushing (120) is connected to the low-voltage side winding in the transformer cavity (111) of the transformer body (110), the high-voltage bushing (130) is connected to the high-voltage side winding in the transformer cavity (111), and the dual-voltage switching switch (140) is connected to the high-voltage side winding for switching the power supply voltage. The forced oil-air cooler (150) is connected to the transformer cavity (111) through the cooler oil inlet pipe (160) and the cooler oil outlet pipe (170).

2. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 1, characterized in that, The forced oil-air cooler (150) is equipped with an oil pump, a fan and a radiator; The oil pump pumps the transformer oil in the transformer cavity (111) into the radiator through the cooler oil inlet pipe (160), and sends the transformer oil into the transformer cavity (111) through the cooler oil outlet pipe (170). The fan blows air onto the surface of the radiator in a blower manner.

3. The oil-cooled dual-voltage mobile ice-melting rectifier transformer (100) according to claim 2, characterized in that, The radiator is attached to the transformer body (110) or there is a gap between it and the transformer body (110).

4. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 2, characterized in that, The forced oil-air cooler (150) is disposed on the transformer body (110) or located on one side of the transformer body (110).

5. The oil-cooled dual-voltage mobile ice-melting rectifier transformer (100) according to claim 1, characterized in that, The high-voltage side winding includes a first high-voltage coil (112) and a second high-voltage coil (113), and the low-voltage side winding includes a first low-voltage coil (114) and a second low-voltage coil (115).

6. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 5, characterized in that, In the transformer cavity (111), the first high-voltage coil (112) and the second high-voltage coil (113) are located between the first low-voltage coil (114) and the second low-voltage coil (115).

7. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 5, characterized in that, The first high-voltage coil (112) and the second high-voltage coil (113) are connected in series, and the dual-voltage switching switch (140) is connected to both ends and the middle series position respectively to realize dual-voltage power supply.

8. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 5, characterized in that, The first low-voltage coil (114) is located between the magnetic core (116) of the transformer body (110) and the first high-voltage coil (112); The second low-voltage coil (115) is located between the second high-voltage coil (113) and the tank wall (117) of the transformer body (110).

9. The oil-cooled dual-voltage mobile de-icing rectifier transformer (100) according to claim 5, characterized in that, Both the first low-voltage coil (114) and the second low-voltage coil (115) adopt a layered coil structure and are provided with at least two gear positions.

10. The forced oil-cooled dual-voltage mobile ice-melting rectifier transformer (100) according to any one of claims 1 to 9, characterized in that, The strong oil-cooled dual-voltage mobile ice-melting rectifier transformer (100) also includes an oil conservator (180) disposed on the transformer body (110), and the oil conservator (180) is connected to the transformer cavity (111) of the transformer body (110).

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