Wide-voltage self-adaptive 24-pulse rectifier transformer for electrolytic hydrogen production

Abstract

The invention relates to the field of transformers, in particular to a wide-voltage self-adaptive 24-pulse rectifier transformer for electrolytic hydrogen production, which comprises a voltage regulating transformer and two 12-pulse rectifier transformers integrated in a transformer box. The input end of the voltage regulating transformer is connected with a power grid, and the output end of the voltage regulating transformer is connected with the input ends of the two rectifier transformers through a multi-gear on-load tap-changer, so that wide-range rapid voltage regulation is realized. The two rectifier transformers are connected through a winding with a specific phase difference, and outputs of the two rectifier transformers are superposed to form a 24-pulse rectification waveform, so that harmonic waves on the power grid side are effectively suppressed. The iron core adopts a high-permeability silicon steel sheet and a full-inclined seam structure, the coil adopts a high-quality oxygen-free copper wire and is wound in a K-type transposition mode, and an interlayer heat dissipation oil way and an external air cooling system are matched, so that loss is reduced, and heat dissipation is optimized. The three transformer bodies are rigidly connected through the clamping pieces, and synchronous lifting installation can be achieved. The device has the advantages of low harmonic wave, high efficiency, wide-voltage self-adaption, good heat dissipation, convenience in installation and the like, and is suitable for a large-scale electrolytic hydrogen production system.

Description

Technical Field

[0001] This invention relates to the field of transformers, and more particularly to a wide-voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production. Background Technology

[0002] In the global energy transition and the advancement of carbon neutrality strategies, green hydrogen, as an important clean energy carrier for achieving deep decarbonization in industries and transportation, faces key technological challenges in its large-scale and efficient production. Electrolysis of water is the mainstream technological route for green hydrogen production, with high-power electrolysis systems, particularly proton exchange membrane electrolyzers and alkaline electrolyzers, developing towards megawatt-scale and even larger scales. These systems require rectifier transformers to convert AC power from the grid into DC power that meets the operating requirements of the electrolyzer; therefore, the performance of the rectifier transformer directly affects the energy efficiency, operational stability, and grid interaction quality of the hydrogen production system.

[0003] Currently, the industry commonly uses 12-pulse rectifier transformers as the rectifier unit in electrolytic hydrogen production systems. These transformers, through the superposition of two rectifier bridges with a 30-degree phase difference, reduce harmonic content to some extent. However, this type of transformer still has several inherent drawbacks. First, its input current harmonic distortion rate is high, continuously injecting a significant proportion of low-order characteristic harmonics such as the 5th and 7th harmonics into the power grid. This not only pollutes the power quality of the grid and increases the capacity and cost of supporting filtering equipment, but also causes additional losses and localized overheating within the transformer. Second, limited by its structure and materials, its overall operating efficiency is difficult to further improve. The losses generated when transmitting high-voltage, high-power electrical energy are not negligible, which contradicts the goal of reducing energy consumption throughout the entire green hydrogen production process.

[0004] Furthermore, to adapt to changes in electrolyzer load, a voltage regulating device is typically required. However, traditional voltage regulating methods have a slow response time and cannot keep up with load fluctuations in real time, affecting hydrogen production efficiency and gas output stability. In addition, the operating voltage range of electrolyzers varies depending on the technology used, and the output voltage range of existing rectifier transformers is relatively narrow, resulting in insufficient equipment versatility and adaptability.

[0005] In terms of heat dissipation, traditional designs are prone to exceeding the standard for winding hot spot temperature when operating at high ambient temperatures or under overload, accelerating insulation aging and threatening long-term operational reliability. In terms of structural installation, voltage regulating transformers and rectifier transformers are mostly independent units, requiring multiple lifting and positioning calibrations during installation, which is cumbersome and increases construction and maintenance costs. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a wide-voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production. By employing an integrated topology combining 24-pulse phase-shifting rectification with wide-voltage autotransformer regulation, and combining multi-dimensional optimized design of the core, coils, insulation, and heat dissipation system, it solves the problems of severe harmonic pollution, low operating efficiency, slow voltage regulation response, poor wide-voltage adaptability, and insufficient heat dissipation capacity of traditional electrolytic hydrogen production rectifier transformers. The specific technical solution is as follows.

[0007] This invention discloses a wide-voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production, comprising: The transformer enclosure contains a voltage regulating transformer, a first rectifier transformer, and a second rectifier transformer. The voltage regulating transformer, the first rectifier transformer, and the second rectifier transformer are rigidly connected as a whole by several clamps set on their outer sides. The input terminal of the voltage regulating transformer is used to connect to the power grid, and its output terminal is electrically connected to the input terminals of the first rectifier transformer and the second rectifier transformer through an on-load tap changer. The on-load tap changer is configured to be multi-position adjustable. The input terminals of the first rectifier transformer and the second rectifier transformer have a predetermined phase difference, and their output terminals are connected in parallel to the user terminal to superimpose their output voltages to form an equivalent 24-pulse rectified output. A heat dissipation system is installed on the outside of the transformer enclosure to cool the equipment inside the enclosure.

[0008] Preferably, the second rectifier transformer has an AC input voltage phase offset of +15° or -15° electrical angle relative to the first rectifier transformer.

[0009] Preferably, the phase difference is achieved by using a +7.5°D / d0,y11 connection group for the first rectifier transformer and a -7.5°D / d2,y1 connection group for the second rectifier transformer.

[0010] Preferably, the on-load tap changer is adjustable in both directions and has 13 positions. It can be adjusted to 27 positions through forward, reverse and zero-position adjustment. Its output voltage range is 4 to 11.5 kV and its response time is less than 300 ms.

[0011] Preferably, the voltage regulating transformer includes an iron core column formed by stacking several iron chips, and the splicing joints of the iron chips adopt a 45° fully oblique joint structure.

[0012] Preferably, an inner coil and an outer coil are wound sequentially around the outside of the iron core column, and an axial heat dissipation oil passage is formed between the inner coil and the outer coil by circumferentially evenly distributed support blocks. The inner and outer coils are wound using a K-type transposition structure.

[0013] Preferably, the wires of the inner coil and the outer coil are extruded oxygen-free copper wires, and the iron chip is made of high-permeability, low-loss grain-oriented silicon steel sheet.

[0014] Preferably, the heat dissipation system includes an oil pipe and a heat dissipation box connected to the transformer housing, and the heat dissipation box is provided with several longitudinal air ducts parallel to the length direction of the transformer housing; The heat dissipation box is equipped with fans fixed to the side walls of the transformer box at both ends.

[0015] Preferably, the voltage regulating transformer, the first rectifier transformer, and the second rectifier transformer are all vertically arranged inside the transformer housing; The top of the transformer housing is fixed with terminals that connect to the wiring terminals inside the housing. The input terminal of the voltage regulating transformer and the output terminals of the first rectifier transformer and the second rectifier transformer are respectively connected to the corresponding terminals via wires.

[0016] Preferably, the rated capacity of the voltage regulating transformer is 8000kVA, and both the first rectifier transformer and the second rectifier transformer are 12-pulse phase-shifting rectifier transformers with a rated capacity of 4000kVA.

[0017] After adopting the above technical solution, the beneficial effects of the present invention are: 1. By superimposing the phase shifts of two 12-pulse rectifier transformers to form a 24-pulse rectified output, low-order characteristic harmonics are effectively canceled, the current harmonic distortion injected into the power grid is significantly reduced, the pollution to the power grid is reduced, and the dependence on additional filtering devices is reduced.

[0018] 2. By adopting high-permeability, low-loss iron core materials, optimizing coil transposition structure and ampere-turn balance, and combining with efficient three-dimensional heat dissipation design, the no-load loss and load loss of the transformer are significantly reduced, thereby improving the overall power conversion efficiency and reducing the operating energy consumption of green hydrogen production.

[0019] 3. The integrated wide-voltage autotransformer, in conjunction with the fast-response on-load tap changer, enables wide-range, multi-level fine adjustment of the output voltage and can quickly track changes in the electrolytic cell load, enhancing the voltage adaptability to different types of electrolytic cells and the system's dynamic response performance.

[0020] 4. By controlling the magnetic flux density through the insulation structure design of the iron core, it is ensured that the transformer does not experience magnetic circuit oversaturation within the normal fluctuation range of the power grid voltage, and can maintain the rated voltage output, thereby improving the equipment's adaptability to the power grid environment and operational stability.

[0021] 5. The combination of the axial cooling oil circuit between the winding layers and the external forced air cooling system forms a highly efficient three-dimensional heat dissipation network, which effectively controls the temperature rise of the winding in high-temperature environments and under overload operation, ensuring the long-term operational reliability and overload capacity of the equipment.

[0022] 6. The three transformer bodies corresponding to the voltage regulation and rectification functions are rigidly connected and integrated into one unit. Combined with the multi-lifting point design, the overall synchronous lifting and installation are realized, which simplifies the on-site installation process, improves the installation accuracy and efficiency, and reduces the complexity of equipment installation and maintenance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the installation of a wide-voltage adaptive 24-pulse rectifier transformer used for electrolytic hydrogen production. Figure 2 A side view of a wide-voltage adaptive 24-pulse rectifier transformer used for electrolytic hydrogen production; Figure 3 This is a schematic diagram of the internal structure of the transformer enclosure; Figure 4 This is a circuit connection diagram of a wide-voltage adaptive 24-pulse rectifier transformer used for electrolytic hydrogen production. Figure 5 This is a top view of the structure of the first body of the vessel; Figure 6 This is a schematic diagram of the structure of an iron chip.

[0025] Explanation of reference numerals in the attached figures: 101-Transformer housing, 102-Oil conservator, 103-Terminal, 104-Clamping component; 200-Cooling system, 201-Oil pipe, 202-Cooling box, 203-Air duct, 204-Fan; 300-Voltage regulating transformer, 301-On-load tap changer, 310-First transformer body, 311-Iron core, 312-Through hole, 313-Insulation layer, 314-Inner coil, 315-Support block, 316-Outer coil, 317-Cooling oil circuit; 400 - First rectifier transformer, 500 - Second rectifier transformer. Detailed Implementation

[0026] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0027] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] An embodiment of the present invention provides a wide-voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production, see [link to relevant documentation]. Figure 1 , Figure 2 The transformer includes a transformer housing 101. An oil conservator 102 is installed above one end of the transformer housing 101 along its length. The oil conservator 102 is connected to the transformer housing 101 through several oil pipes equipped with oil pumps to facilitate the flow of oil inside the transformer housing 101, thereby cooling the interior of the transformer housing 101. Several terminals 103 are fixedly installed on the top of the transformer housing 101. The terminals 103 are fixedly connected to the ends of the internal wiring of the transformer housing 101 to meet subsequent wiring requirements and facilitate wiring operations.

[0029] The connection position between the oil pipe, which is equipped with the oil pump, and the transformer housing 101 is set according to the flow direction of the oil inside the transformer housing 101. This setting method is a prior art well known to those skilled in the art, and will not be described in detail here.

[0030] A heat dissipation system 200 is fixedly installed on both sides of the transformer housing 101. The heat dissipation system 200 includes oil pipes 201 and a heat dissipation box 202. Several oil pipes 201 are fixedly connected to the side wall of the heat dissipation box 202 to introduce the oil inside the transformer housing 101 into the heat dissipation box 202. The oil pipes 201 are fixedly connected to the heat dissipation box 202. Several air ducts 203 parallel to the length direction of the transformer housing 101 are provided on the heat dissipation box 202. The air ducts 203 are arranged longitudinally. Through this arrangement, the surface area of ​​the heat dissipation box 202 is effectively increased, thereby improving the heat dissipation speed of the oil.

[0031] In addition, several fans 204 are respectively installed at the beginning and end of the heat sink 202. The fans 204 are fixedly installed on the side wall of the transformer box 101. The fans 204 at the beginning and end of the heat sink 202 start at the same time and drive the natural air to flow in the same direction, so that the natural air can pass through the heat sink 202 along several air channels 203, accelerate the dissipation of heat inside the heat sink 202, and improve the cooling rate of the oil.

[0032] For a further explanation of the above embodiments, see Figure 3 The transformer housing 101 contains a voltage regulating transformer 300, a first rectifier transformer 400, and a second rectifier transformer 500. The voltage regulating transformer 300 is used to regulate the voltage. The first rectifier transformer 400 and the second rectifier transformer 500 have the same structure and are used to rectify the voltage.

[0033] The voltage regulating transformer 300, the first rectifier transformer 400, and the second rectifier transformer 500 are all vertically arranged, and their length directions are all parallel to the length direction of the transformer housing 101. Each of the voltage regulating transformer 300, the first rectifier transformer 400, and the second rectifier transformer 500 includes three vertically arranged transformer bodies arranged sequentially along the length direction of the transformer housing 101. Several transformer bodies are fixedly installed inside the transformer housing 101 by several clamps 104 provided on their outer side. The voltage regulating transformer 300, the first rectifier transformer 400, and the second rectifier transformer 500 are fixedly connected by clamps 104. The voltage regulating transformer 300, the first rectifier transformer 400, and the second rectifier transformer 500 are fixedly installed on the cover of the transformer housing 101 by several clamps 104, and several lifting points are fixedly provided on the cover.

[0034] A voltage regulating transformer 300 is installed on the first side of the transformer housing 101. A first rectifier transformer 400 and a second rectifier transformer 500 are aligned along the length of the transformer housing 101 and installed on the second side of the transformer housing 101. The input terminal of the voltage regulating transformer 300 and the output terminals of the first rectifier transformer 400 and the second rectifier transformer 500 are respectively fixedly connected to the corresponding terminals 103 via wires. The terminal 103 connected to the input terminal of the voltage regulating transformer 300 is electrically connected to the high-voltage power grid, and the terminal 103 connected to the output terminals of the first rectifier transformer 400 and the second rectifier transformer 500 is electrically connected to the user terminal.

[0035] Among them, the rated capacity of the voltage regulating transformer 300 is 8000kVA, and the first rectifier transformer 400 and the second rectifier transformer 500 are both 12-pulse phase-shifting rectifier transformers with a rated capacity of 4000kVA.

[0036] The above structure rigidly connects the three transformer bodies—the voltage regulating transformer 300, the first rectifier transformer 400, and the second rectifier transformer 500—into a whole through the clamp 104. Combined with the multi-lifting point design on the cover, it can achieve synchronous lifting and positioning of the three transformer bodies, reducing installation steps and eliminating the need for multiple calibrations, thereby significantly improving installation efficiency.

[0037] For a further explanation of the above embodiments, see Figure 4 The input terminal of the voltage regulating transformer 300 is connected to a 10kV or 13kV power grid. The output terminal of the voltage regulating transformer 300 is electrically connected to the input terminals of the first rectifier transformer 400 and the second rectifier transformer 500 through a reversible on-load tap changer 301. The on-load tap changer 301 has 13 positions. Combined with its reversible adjustment function and zero-position rated working state, it can achieve 27 adjustable positions with an output voltage range of 4 to 11.5kV. Moreover, the response time of the on-load tap changer 301 is less than 300ms, which can match the load fluctuation of the electrolyzer in real time and meet the requirements of electrolytic hydrogen production.

[0038] As a feasible embodiment of the present invention, by configuring the first rectifier transformer 400 and the second rectifier transformer 500 with an AC input having a specific phase difference, the phase of the AC input voltage of the second rectifier transformer 500 relative to the first rectifier transformer 400 is offset by +15° or -15° electrical angle, so that the output voltages of the two are superimposed to form an equivalent 24-pulse rectified output waveform.

[0039] The phase difference can be achieved through various wiring methods. For example, the primary side of the first rectifier transformer 400 and the second rectifier transformer 500 can be connected by an extended delta connection to achieve precise phase shift.

[0040] The first rectifier transformer 400 adopts a +7.5° D / d0,y11 connection group, that is, the primary side is a delta connection with an extended side. The +7.5° phase shift is achieved by adjusting the turns ratio of the extended side winding. The secondary side includes one delta winding and one star winding. The second rectifier transformer 500 adopts a -7.5° D / d2,y1 connection group, that is, the primary side is a delta connection with an extended side. The -7.5° phase shift is achieved by adjusting the turns ratio of the extended side winding. The secondary side includes one delta winding and one star winding.

[0041] The above configuration effectively reduces the total harmonic distortion rate of the grid-side current and significantly suppresses low-order characteristic harmonics such as the 5th, 7th, 11th, and 13th harmonics in the grid-side current. In addition, the harmonic suppression function of this scheme is achieved through the inherent structure of the main power topology, without relying on complex active control or additional power switching devices, thus having higher operational reliability and robustness.

[0042] For a further explanation of the above embodiments, see Figure 5 , Figure 6 The three first bodies 310 that make up the voltage regulating transformer 300 include several iron chips 311, an insulating layer 313, an inner coil 314, a support block 315, and an outer coil 316.

[0043] Several iron chips 311 are stacked in the core of the first body 310. Each iron chip 311 is formed by splicing four end seams. The outline of the iron chip 311 is rectangular, and each end seam is spliced ​​using a 45° fully oblique seam structure. A through hole 312 is horizontally provided in the middle of the iron chip 311. The two ends of the through hole 312 are spliced ​​with the two vertically arranged ends of the iron chip 311 using a 45° fully oblique seam structure.

[0044] Among them, the iron chip 311 is made of high-permeability, low-loss grain-oriented silicon steel sheet, such as 30Q130 grade. The iron core column formed by stacking several iron chips 311 is bound with non-woven glass ribbon. This method can improve the structural compactness and reduce magnetic hysteresis vibration.

[0045] The above design can control the magnetic flux density of the iron core under voltage regulation conditions, ensuring that the iron core does not over-excite when the grid voltage fluctuates within a certain range, while ensuring that the rated voltage can still be output when the voltage fluctuates, thus improving the adaptability of the grid.

[0046] An inner coil 314 and an outer coil 316 are arranged sequentially from the inside to the outside of an iron core column formed by stacking several iron chips 311. Several support blocks 315 are arranged between the inner coil 314 and the outer coil 316. The support blocks 315 are evenly distributed along the circumference, thereby forming several heat dissipation oil passages 317 that penetrate the first body 310 along the axial direction between the inner coil 314 and the outer coil 316, which facilitates the cooling of the first body 310.

[0047] The inner coil 314 and the outer coil 316 are provided with an insulating layer 313 on both the inner and outer sides. The insulating layer 313 is an insulating paper tube with a thickness of 0.5 to 1 mm. Together with the heat dissipation oil circuit 317 formed between the two, the overall insulation strength is improved by utilizing the synergistic effect of oil and paper composite insulation.

[0048] Among them, the leading area of ​​the first body 310 is wrapped with multiple layers of epoxy glass cloth tube, and the overlap of the secondary insulation wrapping is not less than 50%. The epoxy glass cloth tube has excellent electrical insulation, mechanical strength and heat resistance, which can effectively reduce the stress concentration and thickness change risk of the insulation layer at the leading area. The multiple wrapping further reduces the probability of partial discharge and breakdown by increasing the insulation thickness and uniformity.

[0049] The inner coil 314 and the outer coil 316 are made of high-quality oxygen-free copper with a purity of 99.99%, and are processed by extrusion molding process, so that the surface of the conductor is free of burrs and the cross-sectional shape is uniform, which effectively suppresses the skin effect of current and reduces the loss caused by it.

[0050] In addition, the inner coil 314 and the outer coil 316 adopt a K-type transposition structure. Specifically, during the winding process of the inner coil 314 and the outer coil 316, after a certain number of turns, the wire is transposed in the radial position of the winding, so that the wire is alternately distributed between the inner and outer layers of the winding. That is, during the transposition process, the wire moves from the inner layer to the outer layer, or from the outer layer to the inner layer. Insulating material is used to fix and isolate the wire at the transposition point to ensure that the electrical connection of the wire is continuous and the insulation is reliable after the transposition.

[0051] This winding method achieves a balanced distribution of the magnetic field inside the winding by periodically adjusting the radial position of the conductor in the winding, thereby reducing eddy current losses and avoiding local overheating caused by concentrated losses. At the same time, this transposition method also enhances the mechanical stability of the coil, improves its short-circuit resistance, and effectively suppresses structural deformation caused by electromagnetic forces.

[0052] The above design optimizes the current and magnetic flux distribution of the coil, thereby reducing the overall electromagnetic load and the heat generated during operation.

[0053] The embodiments described above are not exhaustive and do not limit the invention to only certain specific embodiments. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A wide voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production, characterized by, The utility model relates to a transformer box (101) is provided with voltage regulating transformer (300), first rectifier transformer (400) and second rectifier transformer (500) inside, voltage regulating transformer (300), first rectifier transformer (400) and second rectifier transformer (500) are rigidly connected as a whole through the clamping piece (104) of setting at its outside, the input of voltage regulating transformer (300) is used to connect power grid, and its output is electrically connected with the input of first rectifier transformer (400) and second rectifier transformer (500) through on-load tap changer (301), on-load tap changer (301) is configured as multi-gear adjustable, the input of first rectifier transformer (400) and second rectifier transformer (500) has predetermined phase difference, and the output of two is used to be connected in parallel to user end to add the output voltage of two and form equivalent 24 pulse rectification output, the outside of transformer box (101) is provided with heat dissipation system (200), and heat dissipation system (200) is used to cool the equipment in the box. The AC input voltage phase of the second rectifier transformer (500) is offset by +15° or -15° electrical angle relative to the first rectifier transformer (400). The phase difference is achieved by using +7.5° D / d0,y11 connection group for the first rectifier transformer (400) and -7.5° D / d2,y1 connection group for the second rectifier transformer (500). The on-load tap changer (301) can be adjusted in positive and negative directions, and is provided with 13 positions. The output voltage range is 4-11.5 kV, and the response time is less than 300 ms. The voltage regulating transformer (300) includes a core column formed by stacking a plurality of core pieces (311). The core pieces (311) are connected by 45° full-inclined joints. The core column is sequentially wound with an inner coil (314) and an outer coil (316). The inner coil (314) and the outer coil (316) are separated by support blocks (315) to form an axial cooling oil path (317).

2. The wide voltage adaptive 24-pulse rectifier transformer for electrolytic hydrogen production according to claim 1, characterized in that, The inner coil (314) and the outer coil (316) are wound by K-type transposition structure.

3. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 2, characterized in that, The wires of the inner coil (314) and the outer coil (316) are extruded oxygen-free copper wires. The core pieces (311) are made of high-permeability low-loss grain-oriented silicon steel sheets.

4. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 1, characterized by, The heat dissipation system (200) includes an oil pipe (201) and a heat dissipation box (202) in communication with the transformer box (101). The heat dissipation box (202) is provided with a plurality of air ducts (203) longitudinally parallel to the length direction of the transformer box (101).

5. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 1, characterized by, The heat dissipation box (202) is provided with a fan (204) fixed to the side wall of the transformer box (101) at both ends.

6. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 5, characterized by, ​ ​ 7. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 6, characterized by, ​ 8. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 1, characterized by, ​ ​ 9. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 1, characterized by, The voltage regulating transformer (300), the first rectifier transformer (400) and the second rectifier transformer (500) are vertically arranged inside the transformer box (101); The top of the transformer box (101) is fixed with a terminal post (103) connected with the line end in the box, and the input end of the voltage regulating transformer (300) and the output ends of the first rectifier transformer (400) and the second rectifier transformer (500) are respectively connected with corresponding terminal posts (103) through wires.

10. The wide voltage adaptive 24-pulse rectifier transformer for hydrogen production by electrolysis according to claim 1, characterized by, The rated capacity of the voltage regulating transformer (300) is 8000 kVA, and the first rectifier transformer (400) and the second rectifier transformer (500) are both 12-pulse phase-shifting rectifier transformers with a rated capacity of 4000 kVA.

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