A continuous repetition frequency operation super-high voltage pulse transformer

Abstract

This invention discloses a continuous repetition frequency (CRLF) ultra-high voltage pulse transformer, comprising an outer cylinder, an oil tank, an input terminal assembly, an output terminal assembly, and a transformer assembly. By rounding the corners of the transformer core, using circular winding of the windings, and incorporating an equalizing ring at the high-voltage end, the problems of tip arcing and corona discharge in ultra-high voltage environments are solved, improving the electric field distribution. The use of a closed-core cage structure for the magnetic core and a tapered winding structure for the secondary windings solves the problem of slow output pulse rise time. The transformer of this invention, with its tubular outer cylinder, can serve as both an oil tank and a transformer assembly mounting point, reducing product size, floor space, and manufacturing complexity. This solves the problems of traditional ultra-high voltage pulse transformers being bulky, heavy, aesthetically unappealing, and structurally complex. Simultaneously, it also functions as a radiation shielding layer, resolving the problem of electromagnetic interference causing damage to the surrounding environment and equipment during online operation.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage pulse transformer technology, and more specifically, relates to a continuous repetition frequency operating ultra-high voltage pulse transformer. Background Technology

[0002] Ultra-high voltage pulse transformers, as special devices, serve functions such as voltage boosting, impedance matching, energy transfer, providing power supply circuits for loads, and supplying energy to generate various pulse power effects. As a core component of pulse power equipment, ultra-high voltage pulse transformers are widely used in numerous technical fields, including radar transmitters, electron accelerators, synchrotron radiation sources, high-energy physics research, life science research, and artificial nuclear reaction technology.

[0003] Currently, there is limited research in China on ultra-high voltage pulse transformers capable of continuous frequency repetition operation at 600kV and above. Furthermore, traditional ultra-high voltage pulse transformers capable of continuous frequency repetition operation also suffer from problems such as large size, unattractive appearance, complex structure, difficulties in production, assembly, and maintenance, slow pulse rise edge, and electromagnetic interference that can easily damage the surrounding environment and equipment when operating online. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a continuous repetition frequency operation ultra-high voltage pulse transformer to solve such problems.

[0005] This invention provides a continuous repetition frequency (CRLF) ultra-high voltage pulse transformer, comprising a horizontally placed outer cylinder made of stainless steel sheet rolled into a tubular structure, with an oil conservator at the top and a fixed base at the bottom; an input end assembly located at one end of the outer cylinder, including an input end fixing flange, a base plate, a base cover plate, and input terminals; an output end assembly located at the other end of the outer cylinder, including an output end fixing flange and a basin-type insulator; and a transformer assembly located inside the outer cylinder, including a cage-type closed-loop magnetic core unit, a conical insulating cylinder, a primary winding, a secondary winding, and a magnetic core epoxy cover plate; wherein, the cage-type closed-loop magnetic core unit includes a core column magnetic core and multiple sets of side column magnetic cores parallel to and circumferentially surrounding the outside of the core column magnetic core, which are used to connect the core column magnetic core and the side column magnetic core. The core is closed at both ends to form a closed core cage structure with an output end cap core. The core epoxy cover plate wraps and fixes the output end cap core, and its outer side is fixedly connected to the fixed bracket inside the outer cylinder by a lifting ring bracket. The conical insulating cylinder has a conical structure, and its central axis coincides with the central axis of the core core. Both ends are fixed to the core epoxy cover plate. The primary winding is fixed on the outer periphery of the core core. The secondary winding is fixed on the outer periphery of the conical insulating cylinder to form a conical winding structure. Its high-voltage end has an equalizing ring as the last turn of the winding, and is connected to the high-voltage lead electrode of the basin insulator through the high-voltage end lead wire. Oil passages are left between the cage-type closed-loop core and the primary and secondary windings.

[0006] Furthermore, the core and side core are wound on a stainless steel tie rod in an involute manner, and an epoxy tube with a wall thickness of 5mm is respectively sleeved on the outside of the core and side core.

[0007] Furthermore, the outgoing end cover magnetic core includes a high-voltage outgoing end cover magnetic core disposed at the high-voltage end of the transformer assembly, and a low-voltage outgoing end cover magnetic core disposed at the low-voltage end of the transformer assembly; wherein the high-voltage outgoing end cover magnetic core has a high-voltage end outlet on its outer periphery, which is a reserved notch for the high-voltage end lead to be led out; the low-voltage outgoing end cover magnetic core has a low-voltage end outlet, which is a reserved notch for the low-voltage end lead to be led in.

[0008] Furthermore, the core column magnetic core is a cylindrical magnetic core with a diameter of 254mm and a length of 1100mm; the side column magnetic cores are cylindrical magnetic cores with a diameter of 86mm and a length of 1100mm, totaling 10 cores.

[0009] Furthermore, the primary winding is made of 0.8*800mm copper foil wound in 4 layers, with each layer having 1 electrical turn and an inductance of 54uH. The primary winding layers are insulated with oil-paper composite insulation with an insulation thickness of 5mm, and the lead wires are made of 100*2mm copper busbars. The secondary winding has 108 turns, and its winding is made of 5.5mm outer diameter multi-strand high-frequency Litz wire with a conductor insulation thickness of 0.5mm, an inter-turn insulation of 7kV, and an inductance of 40mH.

[0010] Furthermore, the outer cylinder is equipped with an observation assembly, including a high-voltage end observation window flange, a high-voltage end observation window, a low-voltage end observation window flange, and a low-voltage end observation window. The high-voltage end observation window flange and the low-voltage end observation window flange are both made of thick stainless steel plate and are sealed and fixed to the surface of the outer cylinder by welding. Their positions correspond to the high-voltage end and the low-voltage end of the transformer assembly, respectively. The high-voltage end observation window and the low-voltage end observation window are made of transparent lead glass and are fixed to the high-voltage end observation window flange and the low-voltage end observation window flange, respectively, by window pressure rings and sealing rings.

[0011] Furthermore, the outer cylinder body is also provided with a measuring flange, which is formed by processing thick stainless steel plate and sealed and fixed to the surface of the outer cylinder by welding; the surface of the measuring flange is also provided with a measuring cover plate, which is formed by processing special epoxy plate and is equipped with a current sampling interface and a voltage sampling interface. The transformer winding status is monitored online through the current sampling interface and the voltage sampling interface.

[0012] Furthermore, a resistance voltage divider is also provided inside the outer cylinder for measuring pulsed high voltage.

[0013] Furthermore, the oil conservator includes an oil level display tube located on the side and a connecting tube located at the bottom; the oil level display tube allows observation of the oil level inside the oil conservator; the two ends of the connecting tube are respectively connected to the outer cylinder and the oil conservator.

[0014] Furthermore, the outer cylinder is provided with an oil inlet at the top and an oil outlet at the bottom connected to an oil drain valve via a pipe.

[0015] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0016] 1. The present invention provides a continuous repetition frequency (CRLF) ultra-high voltage pulse transformer. By employing circular windings for the primary and secondary windings, rounded corners of the cage-type closed-loop magnetic core unit, and a voltage equalization ring at the high-voltage output end of the secondary winding, the problem of tip arcing or corona discharge in ultra-high voltage environments is solved, thus improving the electric field distribution. Furthermore, the closed-loop magnetic core unit with its closed core cage structure and the tapered winding structure of the secondary winding improve the transformer's coupling coefficient, reduce leakage inductance, enhance energy transfer efficiency, and resolve the issue of slow output pulse rise time.

[0017] 2. The present invention provides a continuous repetition frequency operating ultra-high voltage pulse transformer, which ensures that the transformer oil can flow well during operation by leaving oil channels between the cage-type closed-loop magnetic core and the primary winding and the secondary winding to achieve the effect of heat dissipation and cooling.

[0018] 3. The present invention provides a continuous repetition frequency operating ultra-high voltage pulse transformer. The outer cylinder adopts a tubular structure, which serves as both a transformer oil tank and a transformer assembly mounting point. This reduces the product's size, floor space, and processing difficulty, thereby lowering production costs. It solves the problems of traditional ultra-high voltage pulse transformers being bulky, heavy, unattractive, and structurally complex. The metal outer cylinder also serves as a radiation shielding layer, solving the problem of electromagnetic interference causing damage to the surrounding environment and equipment during online operation.

[0019] 4. The present invention provides a continuous repetition frequency operating ultra-high voltage pulse transformer, wherein the transformer assembly is manufactured separately and then assembled as a whole and hoisted and fixed inside the outer cylinder, which facilitates assembly and maintenance, and can also reduce production costs and improve production efficiency. Attached Figure Description

[0020] Figure 1 This is a front view of the structure of a continuously repetitive ultra-high voltage pulse transformer according to an embodiment of the present invention;

[0021] Figure 2 This is a vertical cross-sectional view of a continuously repetitive ultra-high voltage pulse transformer according to an embodiment of the present invention;

[0022] Figure 3 This is a horizontal cross-sectional view of a continuously repetitive ultra-high voltage pulse transformer according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the oil reservoir structure in an embodiment of the present invention;

[0024] Figure 5 This is a vertical sectional view of the transformer assembly in an embodiment of the present invention;

[0025] Figure 6 This is a left view of the transformer assembly structure in an embodiment of the present invention;

[0026] Figure 7 This is a vertical cross-sectional view of the cage-type closed-loop magnetic core unit in an embodiment of the present invention;

[0027] Figure 8 This is a left view of the magnetic core of the high-voltage output end cover in an embodiment of the present invention;

[0028] Figure 9 This is a left view of the low-voltage output end cap magnetic core in an embodiment of the present invention.

[0029] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0030] 1-Outer cylinder, including: 101-oil inlet, 102-oil drain valve;

[0031] 2-Oil conservator, including: 201-Oil level display tube, 202-Connecting tube;

[0032] 3-Fixed base;

[0033] 4-Input terminal assembly, including: 401-Input terminal mounting flange, 402-Base plate, 403-Base cover plate, 404-Input terminal;

[0034] 5-Output terminal assembly, including: 501-Output terminal fixing flange, 502-Pot type insulator;

[0035] 6-Observation components, including: 601-High-pressure end observation window flange, 602-High-pressure end observation window, 603-Low-pressure end observation window flange, 604-Low-pressure end observation window;

[0036] 7-Transformer assembly, including: 71-Cage closed-loop magnetic core unit, 711-Core column magnetic core, 712-Side column magnetic core, 713-High voltage output end cover magnetic core, 714-Low voltage output end cover magnetic core, 715-High voltage end outlet, 716-Low voltage end outlet, 717-Stainless steel tie rod, 72-Conical insulating cylinder, 73-Primary winding, 74-Secondary winding, 75-Magnetic core epoxy cover plate, 76-Lifting ring bracket, 77-Resistor voltage divider, 78-Equalizing ring. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1-9 As shown, this invention provides a continuous repetition frequency (CRLF) ultra-high voltage pulse transformer, including an outer cylinder 1, an oil conservator 2 located at the top of the outer cylinder 1, an input terminal assembly 4 and an output terminal assembly 5 located at both ends of the outer cylinder 1, and a transformer assembly 7 located inside the outer cylinder 1. The transformer assembly 7 includes a cage-type closed-loop magnetic core unit 71, a primary winding 73, and a secondary winding 74. By rounding the corners of the magnetic core, the circular winding of the primary winding 73 and the secondary winding 74, and the presence of an equalizing ring 78 at the high-voltage end of the secondary winding 74, the problems of arcing and corona discharge at the transformer's tip under ultra-high voltage conditions are solved, and the electric field distribution is improved. The closed-loop magnetic core unit 71 adopts a closed-core cage structure, and the secondary winding 74 adopts a tapered winding structure, which improves the transformer's coupling coefficient, reduces leakage inductance, improves energy transfer efficiency, and solves the problem of slow output pulse rise time. After the transformer assembly 7 is assembled as a single unit, it can be hoisted into the outer cylinder 1 by means of lifting ring brackets at both ends and fixed with bolts, making the production, assembly, and maintenance of the transformer simple and easy to operate. The transformer of the present invention, through the tubular outer cylinder 1, can also serve as an oil tank and a transformer assembly installation, reducing the product's size, floor space, and processing difficulty, thereby lowering production costs and solving the problems of traditional ultra-high voltage pulse transformers being bulky, heavy, unattractive, and complex in structure. At the same time, the metal outer cylinder 1 also functions as a radiation shielding layer, solving the problem of electromagnetic interference causing damage to the surrounding environment and equipment during online power-on operation.

[0039] like Figure 1 As shown, the outer cylinder 1 is placed horizontally and has a circular tube structure. The left end of the tube tapers inward to fit the output end assembly 5 and achieve a sealed and fixed connection. It has an oil inlet 101 at the top and an oil outlet at the bottom connected to an oil drain valve 102 via a pipe. The outer cylinder 1 is made of stainless steel plate wound and welded into a tubular structure, which has high structural strength and good sealing performance. It also serves as a radiation shielding layer, solving the problem of electromagnetic interference causing damage to the surrounding environment and equipment during online power-on operation.

[0040] The bottom of the outer cylinder 1 is also fixedly provided with a fixed base 3, which is made of channel steel, has high support strength, and is fixedly connected to the bottom of the outer cylinder 1 by welding.

[0041] The input terminal assembly 4 and the output terminal assembly 5 are respectively sealed and fixedly connected to the two ends of the outer cylinder 1 to seal the outer cylinder 1 and prevent oil leakage.

[0042] Among them, such as Figure 1-2 As shown, the input terminal assembly 4 includes an input terminal fixing flange 401, a base plate 402, a base cover plate 403, and an input terminal 404. The input terminal fixing flange 401 is located at one end of the outer cylinder 1, and is made of stainless steel plate, and is fixedly connected to the outer cylinder 1 at one end by welding. The base plate 402 is also made of stainless steel plate, and has multiple bolt holes circumferentially arranged on its surface. By fixing the base plate 402 to the input terminal fixing flange 401 with bolts, and using a sealing ring between them, the sealing of the outer cylinder 1 at one end is achieved, effectively preventing transformer oil leakage. The base cover plate 403 serves as a base for connecting and fixing the input terminal 404. It is located on the outside of the base plate 402 and is fixedly connected to the base plate 402 with bolts, and a sealing ring is used between them for sealing. The input terminal 404 is fixedly mounted on the base cover plate 403. One end of the terminal passes through the base cover plate 403 and the bottom plate 402 in sequence, and is electrically connected to the low-voltage end of the transformer assembly 7 located in the outer cylinder 1 through a busbar.

[0043] like Figure 2-3 As shown, the output end assembly 5 includes an output end fixing flange 501 and a basin-type insulator 502. The output end fixing flange 501 is located at the other end of the outer cylinder 1, and is made of stainless steel plate. It is sealed and fixedly connected to the contraction pipe opening at the other end of the outer cylinder 1 by welding. The basin-type insulator 502 has its basin opening facing outward, and its basin bottom is located inside the outer cylinder 1. Multiple bolt fixing holes are provided circumferentially along the basin edge. The basin-type insulator 502 is fixedly connected to the output end fixing flange 501 by bolts passing through the bolt fixing holes. Furthermore, a sealing ring is provided between the two to effectively prevent oil leakage at the other end of the outer cylinder 1. The basin bottom of the basin insulator 502 is provided with a high-voltage lead electrode, which is electrically connected to the high-voltage end of the transformer assembly 7 located inside the outer cylinder 1 through a high-voltage lead wire.

[0044] Furthermore, such as Figure 1As shown, for observation of the low-voltage and high-voltage ends of transformer assembly 7, the outer cylinder 1 is equipped with an observation assembly 6, including a high-voltage end observation window flange 601, a high-voltage end observation window 602, a low-voltage end observation window flange 603, and a low-voltage end observation window 604. Both the high-voltage end observation window flange 601 and the low-voltage end observation window flange 603 are made of thick stainless steel plate and are sealed and fixed to the surface of the outer cylinder by welding. Their positions correspond to the high-voltage end and low-voltage end of transformer assembly 7, respectively. The high-voltage end observation window 602 and the low-voltage end observation window 604 are made of transparent lead glass and are fixed to the high-voltage end observation window flange 601 and the low-voltage end observation window flange 603, respectively, by window pressure rings and sealing rings, effectively preventing transformer oil leakage.

[0045] Preferably, the outer cylinder 1 is also provided with a measuring flange. The measuring flange is formed by processing thick stainless steel plate and is sealed and fixed to the surface of the outer cylinder 1 by welding. The surface of the measuring flange is provided with a measuring cover plate, which is formed by processing special epoxy plate. The measuring cover plate is equipped with a current sampling interface and a voltage sampling interface. The transformer winding status can be monitored online through the current sampling interface and the voltage sampling interface. A sealing ring is provided between the measuring cover plate and the measuring flange, and the measuring cover plate is sealed and fixed to the measuring flange by bolts.

[0046] like Figure 4 As shown, the oil conservator 2 is fixedly installed at the top of the outer cylinder 1 to adjust the oil level in the outer cylinder 1, ensuring that the outer cylinder 1 is always full of oil, reducing the contact area between the oil and air, and preventing the oil from getting damp or oxidizing too quickly. It includes an oil level display tube 201 on the side and a connecting tube 202 at the bottom. The oil level display tube 201 allows observation of the oil level in the oil conservator 2, facilitating timely replenishment of transformer oil. The connecting tube 202 is connected to both ends of the outer cylinder 1 and the oil conservator 2, respectively, creating conditions for the thermal expansion and contraction of the transformer oil, ensuring that the outer cylinder 1 is always full of oil under any temperature and operating conditions.

[0047] like Figure 5-7 As shown, the transformer assembly 7 is hoisted into the outer cylinder 1 as a whole and connected to the fixed bracket inside the outer cylinder 1 by bolts. It includes a cage-type closed-loop magnetic core unit 1, a conical insulating cylinder 2, a primary winding 73, a secondary winding 74, a magnetic core epoxy cover plate 75, a lifting ring bracket 76, and a resistance voltage divider 77.

[0048] The epoxy cover plate 75 is located at both ends of the cage-type closed-loop magnetic core unit 71, wrapping and fixing the output end cap magnetic cores at both ends of the cage-type closed-loop magnetic core unit 71. A lifting ring bracket 76 is fixedly provided on its outer side. The lifting ring bracket 76 is provided with multiple bolt fixing holes and lifting ring holes. Through the lifting ring holes, the entire transformer assembly 7 can be hoisted into the outer cylinder 1. Through the multiple bolt fixing holes provided on the lifting ring bracket 76, bolts are used to fix it to the fixed bracket inside the outer cylinder 1, realizing the fixed connection between the transformer assembly 7 and the outer cylinder 1.

[0049] The cage-type closed-loop magnetic core unit 1 includes an output end cap magnetic core, a core column magnetic core 711 whose two ends are fixedly connected to the center of the output end cap magnetic core, and a side column magnetic core 712 circumferentially surrounding the outside of the core column magnetic core 711. The two ends of the side column magnetic core 712 are fixedly connected to the output end cap magnetic core. By having multiple sets of side column magnetic cores 712 arranged parallel to each other and circumferentially surrounding the outside of the core column magnetic core 711, and by using the output end cap magnetic core to seal the two ends of the core column magnetic core 711 and the side column magnetic core 712, a closed magnetic core cage structure is formed.

[0050] The conical insulating cylinder 72 has a conical structure, with its central axis coinciding with the central axis of the core column magnetic core 711. The bottom of the cone is located at the high-voltage end of the transformer assembly 7 and is fixed to the magnetic core epoxy cover plate 75 by bolts. The top of the conical insulating cylinder 72 is located at the low-voltage end of the transformer assembly 7 and is fixed to the magnetic core epoxy cover plate 75 by bolts. The conical insulating cylinder 72 provides support for the winding structure of the winding.

[0051] The primary winding 73 is fixed to the outer periphery of the core 711, and the secondary winding 74 is fixed to the outer periphery of the conical insulating cylinder 72. The primary winding 73 employs a copper foil winding structure, with oil-paper composite insulation between layers. Copper busbars are used as leads, and the winding is supported by a primary bobbin. The primary bobbin is fixed to the outside of the core 711 and is made of a special epoxy board material. The secondary winding 74 adopts a conical winding structure, which effectively reduces the transformer's leakage inductance, reduces the rise time of the output pulse, and improves the transformer's coupling coefficient. The secondary winding is wound with multi-strand high-frequency Litz wire, which reduces heat generation. The secondary conical winding insulating cylinder 72 is made of a special epoxy board material, and winding limiting grooves are used on the secondary conical winding insulating cylinder 72 to ensure the spacing and insulation between the high-frequency Litz wires. Preferably, the high-voltage end of the secondary winding 74 is provided with an equalizing ring 78, which is formed by welding aluminum tubes and fixed to the high-voltage end of the secondary winding 74 with epoxy resin as the last turn of the winding. It is connected to the high-voltage lead-out electrode of the basin insulator 502 through the high-voltage end lead wire, which can optimize the electric field distribution at the high-voltage end of the transformer.

[0052] The resistive voltage divider 77 is located inside the outer cylinder 1 and is used for measuring pulsed high voltage.

[0053] like Figure 7-9 As shown, the cage-type closed-loop magnetic core 71 is assembled from multiple magnetic cores stacked together and fixed by stainless steel tie rods 717. The contact positions of each component of the magnetic core are flat and burr-free to reduce air gaps and increase the transformer coupling coefficient. After the primary winding 73 and the secondary winding 74 are wound, they are installed into the cage-type closed-loop magnetic core unit 71 as a whole. During installation and fixing, it is necessary to ensure that there are gaps between each component to ensure that the transformer oil can flow well during transformer operation to achieve heat dissipation and cooling effect.

[0054] Furthermore, the cage-type closed-loop magnetic core 71 includes a core column magnetic core 711, a side column magnetic core 712, and an output end cover magnetic core. The output end cover magnetic core includes a high-voltage output end cover magnetic core 713 located at the high-voltage end of the transformer assembly 7, and a low-voltage output end cover magnetic core 714 located at the low-voltage end of the transformer assembly 7. The core magnetic core 711 and the side core magnetic core 712 are wound on a stainless steel tie rod 717 in an involute pattern. The magnetic core is covered with a 5mm thick epoxy tube and cast together with the magnetic core using epoxy resin. The high-voltage output end cap magnetic core 713 and the low-voltage output end cap magnetic core 714 have a radial structure with flat, burr-free end faces and openings for reserved positions for lead wires. The high-voltage output end cap magnetic core 713 has a high-voltage end outlet 715 on its outer periphery, which is a reserved notch for leading out the high-voltage end wire. The low-voltage output end cap magnetic core 714 has a low-voltage end outlet 716, which is a reserved notch for leading in the low-voltage end wire.

[0055] In this embodiment of the invention, the core column core 711 of the cage-type closed-loop magnetic core 71 is a cylindrical magnetic core with a diameter of 254mm and a length of 1100mm; the side column cores 712 are cylindrical magnetic cores with a diameter of 86mm and a length of 1100mm, totaling 10 cores. The primary winding 73 and the secondary winding 74 are mounted and fixed on the insulating frame, and then the whole assembly is installed into the cage-type closed-loop magnetic core 71 and fixed in the outer cylinder 1 with fasteners to facilitate the assembly of the transformer assembly 7; the primary winding 73 is wound with 4 layers of 0.8*800mm copper foil, each layer having 1 electrical turn, ensuring its inductance is 54uH. The primary winding 73 is insulated with oil-paper composite insulation between layers, with an insulation thickness of 5mm (1mm paper + 4mm oil channel), and the lead wires are 100*2mm copper busbars. The secondary winding 74 has 108 turns to ensure sufficient margin. It employs a tapered winding structure to enhance transformer coupling, reduce leakage inductance, and shorten the rise time of the output pulse. The winding uses 5.5mm outer diameter multi-strand high-frequency Litz wire with 0.5mm insulation thickness and 7kV inter-turn insulation. The inductance is maintained at 40mH by adjusting the turn spacing. Oil channels are provided between the cage-type closed-loop magnetic core 71, the primary winding 73, and the secondary winding 74 to ensure good transformer oil flow during operation for effective heat dissipation and cooling.

[0056] The continuous repetition frequency operation ultra-high voltage pulse transformer of the present invention has an outer cylinder 1 with a tubular structure that serves as both a transformer oil tank and a mounting point for transformer components 7. This reduces the product's size, floor space, and processing difficulty, thereby lowering production costs and solving the problems of traditional ultra-high voltage pulse transformers being bulky, heavy, unattractive, and structurally complex. The metal outer cylinder 1 also serves as a radiation shielding layer, solving the problem of electromagnetic interference causing damage to the surrounding environment and equipment during online operation.

[0057] The transformer assembly 7 is manufactured separately for each component and then hoisted and fixed inside the outer cylinder 1 after overall assembly, which facilitates assembly and maintenance, and can also reduce production costs and improve production efficiency. The problems of tip arcing or corona in the transformer under ultra-high voltage environment are solved by measures such as circular winding of the primary winding 73 and secondary winding 74, rounding of the edges of the cage-type closed-loop magnetic core unit, and the use of equalizing rings at the high voltage output end of the secondary winding 74, thereby improving the electric field distribution.

[0058] By adopting a closed-loop magnetic core unit 71 with a closed core cage structure and a tapered winding structure for the secondary winding 74, the coupling coefficient of the transformer is improved, leakage inductance is reduced, energy transfer efficiency is improved, and the problem of slow output pulse rise time is solved.

[0059] Through the above design, this invention has solved the problems of large size, large footprint, difficult processing, unsightly appearance, slow rise time of output pulse leading edge, and easy arcing or corona discharge of the transformer when outputting 600kV, which are currently common in China for 600kV continuous repetition frequency ultra-high voltage pulse transformers. It also solves the heat dissipation problem of transformers operating at continuous repetition frequency.

[0060] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous repetition frequency (CRLF) ultra-high voltage pulse transformer, characterized in that, include: The horizontally placed outer cylinder (1) is made of stainless steel plate rolled into a tubular structure, with an oil pillow (2) at the top and a fixed base (3) at the bottom; The input terminal assembly (4) located at one end of the outer cylinder (1) includes an input terminal fixing flange (401), a base plate (402), a base cover plate (403), and an input terminal (404); The output end assembly (5) located at the other end of the outer cylinder (1) includes an output end fixing flange (501) and a basin insulator (502); The transformer assembly (7) located inside the outer cylinder (1) includes a cage-type closed-loop magnetic core unit (71), a conical insulating cylinder (72), a primary winding (73), a secondary winding (74), and a magnetic core epoxy cover plate (75); wherein, the cage-type closed-loop magnetic core unit (71) includes a core column magnetic core (711), and multiple sets of side column magnetic cores (712) that are parallel and circumferentially surrounding the outside of the core column magnetic core (711), thereby sealing both ends of the core column magnetic core (711) and the side column magnetic cores (712) to form a closed magnetic core cage structure output end cover magnetic core; the magnetic core epoxy cover plate (75) wraps and fixes the output end cover magnetic core, and its outer side is connected to the outside by a lifting ring bracket (76). The fixed bracket inside the outer cylinder (1) is fixedly connected; the conical insulating cylinder (72) has a conical structure, and its central axis coincides with the central axis of the core column magnetic core (711). Both ends are fixed on the magnetic core epoxy cover plate (75); the primary winding (73) is fixed on the outer periphery of the core column magnetic core (711); the secondary winding (74) is fixed on the outer periphery of the conical insulating cylinder (72) to form a conical winding structure. Its high-voltage end is provided with an equalizing ring (78) as the last turn of the winding, and is connected to the high-voltage lead-out electrode of the basin insulator (502) through the high-voltage end lead wire; an oil passage is left between the cage-type closed-loop magnetic core unit (71), the primary winding (73), and the secondary winding (74).

2. The continuously repetitive frequency (CRLF) ultra-high voltage pulse transformer according to claim 1, characterized in that, The core magnetic core (711) and the side magnetic core (712) are wound on the stainless steel tie rod (717) in an involute manner. The core magnetic core (711) and the side magnetic core (712) are respectively fitted with epoxy tubes with a wall thickness of 5mm.

3. The continuously repetitive frequency (CRLF) ultra-high voltage pulse transformer according to claim 1, characterized in that, The outgoing end cap magnetic core includes a high-voltage outgoing end cap magnetic core (713) located at the high-voltage end of the transformer assembly (7) and a low-voltage outgoing end cap magnetic core (714) located at the low-voltage end of the transformer assembly (7); wherein the high-voltage outgoing end cap magnetic core (713) has a high-voltage end outlet (715) on its outer periphery, which is a reserved notch for the high-voltage end lead to be led out; the low-voltage outgoing end cap magnetic core (714) has a low-voltage end outlet (716) on its outer periphery, which is a reserved notch for the low-voltage end lead to be led in.

4. A continuously repetitive ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The core column (711) is a cylindrical magnetic core with a diameter of 254 mm and a length of 1100 mm; the side column magnetic core (712) is a cylindrical magnetic core with a diameter of 86 mm and a length of 1100 mm, and there are 10 of them in total.

5. A continuously repetitive frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The primary winding (73) is made of 0.8*800mm copper foil in 4 layers, each layer has 1 electrical turn, and the inductance value is 54uH. The primary winding (73) is insulated with oil paper composite insulation between layers with an insulation thickness of 5mm. The lead wire is made of 100*2mm copper busbar. The secondary winding (74) has 108 turns. The winding uses multi-strand high-frequency Litz wire with an outer diameter of 5.5mm, a wire insulation thickness of 0.5mm, an inter-turn insulation of 7kV, and an inductance of 40mH.

6. A continuously repetitive frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The outer cylinder (1) is provided with an observation assembly (6), including a high-pressure end observation window flange (601), a high-pressure end observation window (602), a low-pressure end observation window flange (603), and a low-pressure end observation window (604); The high-voltage end observation window flange (601) and the low-voltage end observation window flange (603) are both made of thick stainless steel plate and are sealed and fixed to the outer cylinder surface by welding. Their positions correspond to the high-voltage end and the low-voltage end of the transformer assembly (7), respectively. The high-voltage end observation window (602) and the low-voltage end observation window (604) are made of transparent lead glass and are fixed to the high-voltage end observation window flange (601) and the low-voltage end observation window flange (603) respectively by window pressure ring and sealing ring.

7. A continuously repetitive frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The outer cylinder (1) is also provided with a measuring flange. The measuring flange is formed by processing thick stainless steel plate and is sealed and fixed to the surface of the outer cylinder (1) by welding. The measuring flange surface is also provided with a measuring cover plate. The measuring cover plate is formed by processing special epoxy plate and is equipped with a current sampling interface and a voltage sampling interface. The transformer winding status is monitored online through the current sampling interface and the voltage sampling interface.

8. A continuously repetitive frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The outer cylinder (1) is also equipped with a resistance voltage divider (77) for measuring pulsed high voltage.

9. A continuously repetitive frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, characterized in that, The oil conservator (2) includes an oil level display tube (201) located on the side and a connecting tube (202) located at the bottom; the oil level in the oil conservator (2) can be observed through the oil level display tube (201); the two ends of the connecting tube (202) are connected to the outer cylinder (1) and the oil conservator (2) respectively.

10. A continuous repetition frequency operating ultra-high voltage pulse transformer according to any one of claims 1-3, wherein the top of the outer cylinder (1) is provided with an oil inlet (101) and the bottom oil outlet is connected to an oil drain valve (102) via a pipeline.

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