An epoxy resin insulated electromagnetic voltage transformer and its manufacturing process

Abstract

The present invention relates to the field of voltage transformers, and more specifically, to an epoxy resin insulated electromagnetic voltage transformer and its manufacturing process. The electromagnetic voltage transformer comprises: a high-voltage side winding, a low-voltage side winding, and an iron core; the high-voltage side winding is connected to one side of the iron core via a first winding frame, and the low-voltage side winding is connected to the other side of the iron core via a second winding frame; the iron core is connected to an outer shell via an upper positioning structure and a lower positioning structure; the first winding frame is connected to the upper positioning structure; and an epoxy resin insulation structure is cast between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure, and the outer shell. The epoxy resin insulation structure is cast between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure, and the outer shell to form an electromagnetic voltage transformer using epoxy resin insulation as the insulating medium. Compared with traditional voltage transformers, the electromagnetic voltage transformer has the advantages of being small in size, light in weight, oil-free, gas-free, and substantially pollution-free.

Description

Technical Field

[0001] The present invention relates to the field of voltage transformers, and more particularly to an epoxy resin insulated electromagnetic voltage transformer and a manufacturing process thereof. Background Art

[0002] Currently, oil-immersed voltage transformers (OTTs) are the predominant type used in 66kV power grids, accounting for over 50% of all high-voltage transformers in the grid. Oil-immersed OTTs have been around for a long time, making their operation and maintenance familiar to users. They are also inexpensive and continue to be widely used in older grids. However, these OTTs are bulky, require extensive maintenance, and are prone to fire and explosion. Consequently, they are rarely used in new grids, replaced by high-voltage SF6 gas-insulated OTTs. Currently, the SF6 electromagnetic OTTs used in substations mostly utilize a complex double-shield design with a composite hollow bushing for internal shielding. This design is extremely difficult to manufacture and install, and is costly. Furthermore, in existing OTTs, the relative position of the high-voltage winding and the core is difficult to adjust after connection, limiting flexibility during the design and manufacturing phase and hindering optimization of the device's performance and structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an epoxy resin insulated electromagnetic voltage transformer and a manufacturing process thereof.

[0004] The technical solution adopted in the present invention is:

[0005] An epoxy resin insulated electromagnetic voltage transformer comprises: a high-voltage side winding, a low-voltage side winding and an iron core; the high-voltage side winding is connected to one side of the iron core via a first winding skeleton, and the low-voltage side winding is connected to the other side of the iron core via a second winding skeleton; the iron core is connected to an outer shell via an upper positioning structure and a lower positioning structure; the first winding skeleton is connected to the upper positioning structure so as to slide on the iron core under the control of the upper positioning structure to adjust the relative position of the high-voltage side winding and the iron core; an epoxy resin insulation structure is cast between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure and the outer shell.

[0006] Furthermore, the high-voltage side winding is a stepped winding composed of six winding bodies of different sizes, a U-shaped grading ring is provided between the connecting ends of two adjacent winding bodies, and an annular grading ring is provided at the end of the winding body at the bottom end of the high-voltage side winding.

[0007] Furthermore, the wrapping structure of the high-voltage side winding adopts a conical semiconductor structure with equipotential lines.

[0008] Furthermore, the iron core adopts a continuously wound iron core structure.

[0009] Furthermore, the first winding frame is slidably connected to one side of the iron core, and the second winding frame is fixedly connected to the other side of the iron core; the upper positioning structure includes: an upper positioning frame fixed above the iron core, and upper and lower sliders are slidably provided in the regulating groove of the upper positioning frame, and the upper and lower sliders are threadedly connected to the positioning screw rotated on the upper positioning frame, and the upper and lower sliders are connected to the first winding frame through a connecting rod.

[0010] Furthermore, the lower positioning structure includes: a lower positioning frame fixed below the iron core, a circular through-hole provided at the bottom of the lower positioning frame for the positioning through-tube to pass through, the bottom of the circular through-hole is connected to the conical penetration groove on the lower surface of the lower positioning frame, and the top of the circular through-hole is connected to the rectangular groove in the middle of the lower positioning frame; the top of the positioning through-tube is closed and the bottom is fixed to the bottom surface of the inner shell; the positioning clamping column sliding on the side of the positioning through-tube is clamped on the bottom surface of the rectangular groove, and the end of the positioning clamping column inserted into the positioning through-tube is connected to the inner wall of the positioning through-tube through a compression spring.

[0011] Furthermore, more than one rectangular sleeve is arranged above the interior of the shell; the rectangular sleeves are sealed and slidably connected with rectangular plates, which are inserted into the internal thread groove at one end of the rectangular sleeve and are threadedly connected to the screw rotated on the shell; the end of the rectangular plate that passes through the outside of the rectangular sleeve is inserted into the rectangular through-hole on the side of the upper positioning frame, and abuts against the side of the positioning screw; the top of the shell is connected to a top cover with a pouring hole and an exhaust hole, and the protrusion on the lower surface of the top cover is clamped in the two grooves on the upper surface of the upper positioning frame.

[0012] Furthermore, two heat dissipation pipes transversely arranged below the shell are located below the iron core.

[0013] Furthermore, rotating columns are provided in the two heat dissipation pipes, and the front ends of the two rotating columns are rotatably connected to the lower ends of the two lifting links. The lifting columns at the upper ends of the two lifting links are slid in the horizontal slideways of the lifting frame, and the lifting frame is connected to a movable scraper frame mounted on the outer side of the outer shell. The two ends of the movable scraper frame are connected to the two protective covers on the side of the outer shell through one or more springs respectively, and the two protective covers are provided on the outside of the two lead through-holes on the side of the outer shell; the rear end of one rotating column is fixed to the vertical windward plate, and the rear end of the other rotating column is fixed to the horizontal rainward plate with a water collecting trough.

[0014] Furthermore, the first winding skeleton includes: a skeleton sleeve for winding and installing the high-voltage side winding, the inner side of the skeleton sleeve sleeve mounted on the iron core is connected to the upper positioning structure; the outer side of the bottom of the skeleton sleeve is connected to the wire rack through a bending structure, and the top of the wire rack is connected to the first winding roller and the guide plate with cable through holes, and the first winding roller is located between the guide plate and the skeleton sleeve; the second winding roller is slidably connected in the longitudinal groove below the wire rack, and the movable side plates on both sides of the second winding roller are slid on the side surfaces of the wire rack; tensioning springs are connected between the two movable side plates and the two protrusions at the bottom of the wire rack; the connection terminals of the high-voltage side winding are sequentially passed through the top of the first winding roller and the bottom of the second winding roller, and pass through the cable through holes of the guide plate; the second winding skeleton has the same structure as the first winding skeleton, and the skeleton sleeve of the second winding skeleton is fixed to the iron core by bolts.

[0015] A manufacturing process, applied to the aforementioned epoxy resin insulated electromagnetic voltage transformer, comprises the following steps:

[0016] Assembling the high-voltage side winding wound on the first winding frame on one side of the iron core;

[0017] Assembling the low-voltage side winding wound on the second winding frame on the other side of the iron core;

[0018] Connecting the iron core to the upper positioning structure and the lower positioning structure, and connecting the first winding skeleton to the upper positioning structure;

[0019] Connecting the upper positioning structure and the lower positioning structure to the housing, and adjusting the relative position of the high-voltage side winding and the iron core on the first winding frame through the upper positioning structure;

[0020] An epoxy resin insulation structure is poured between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure and the shell, and a finished product is formed after curing.

[0021] As can be seen from the above scheme, the beneficial effects of the present invention are:

[0022] In the present invention, an epoxy resin insulation structure is cast between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure and the shell to form an electromagnetic voltage transformer using epoxy resin insulation as the insulating medium. Compared with traditional voltage transformers, it not only has the characteristics of small size, light weight, oil-free, gas-free, and basically no pollution to the environment, but also the product basically requires no maintenance, reducing costs; in addition, the first winding skeleton is connected to the upper positioning structure, which is convenient for adjusting the relative position of the high-voltage side winding and the iron core, providing greater flexibility in the design and processing stages, and is conducive to optimizing the performance and structure of the voltage transformer of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 An overall cross-sectional view of a voltage transformer provided in an embodiment of the present invention;

[0026] Figure 2 The overall schematic diagram of the voltage transformer provided by the embodiment of the present invention is Figure 1 ;

[0027] Figure 3 The overall schematic diagram of the voltage transformer provided by the embodiment of the present invention is Figure 2 ;

[0028] Figure 4 A partial schematic diagram of a voltage transformer provided in an embodiment of the present invention Figure 1 ;

[0029] Figure 5 A partial schematic diagram of a voltage transformer provided in an embodiment of the present invention Figure 2 ;

[0030] Figure 6 A schematic diagram of a first winding skeleton provided in an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a second winding skeleton provided by an embodiment of the present invention;

[0032] Figure 8 A schematic diagram of an upper positioning structure provided by an embodiment of the present invention;

[0033] Figure 9 A cross-sectional view of a lower positioning structure provided by an embodiment of the present invention;

[0034] Figure 10 Schematic diagram of a housing provided in an embodiment of the present invention Figure 1 ;

[0035] Figure 11 Schematic diagram of a housing provided in an embodiment of the present invention Figure 2 ;

[0036] Figure 12 A schematic diagram of a top cover provided in an embodiment of the present invention;

[0037] Figure 13 A schematic diagram of a high-voltage side winding provided by an embodiment of the present invention;

[0038] Icons: High-voltage side winding 1; winding body 101; U-shaped equalizing ring 102; annular equalizing ring 103; low-voltage side winding 2; iron core 3; first winding skeleton 4; skeleton sleeve 401; conductor frame 402; first winding roller 403; guide plate 404; second winding roller 405; movable side plate 406; tensioning spring 407; second winding skeleton 5; upper positioning structure 6; upper positioning frame 601; slider 602; positioning screw 603; connecting rod 604 ; Lower positioning structure 7; Lower positioning frame 701; Positioning through-tube 702; Conical penetration groove 703; Positioning clamping column 704; Housing 8; Rectangular sliding sleeve 801; Rectangular plate 802; Screw 803; Top cover 804; Bump 805; Heat dissipation pipe 806; Rotating column 807; Lifting connecting rod 808; Lifting column 809; Lifting frame 810; Movable scraping frame 811; Spring 812; Protective cover 813; Vertical windward plate 814; Horizontal rain-facing plate 815. DETAILED DESCRIPTION

[0039] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings below, it is obvious that the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0041] Example 1

[0042] See also Figures 1-13 The present invention provides an epoxy resin insulated electromagnetic voltage transformer, comprising: a high-voltage side winding 1, a low-voltage side winding 2 and an iron core 3; the high-voltage side winding 1 is connected to one side of the iron core 3 through a first winding skeleton 4, and the low-voltage side winding 2 is connected to the other side of the iron core 3 through a second winding skeleton 5, and the second winding skeleton 5 and the iron core 3 can be connected by bolts or adhesives to achieve relative fixation; the iron core 3 is connected to the shell 8 through an upper positioning structure 6 and a lower positioning structure 7; the first winding skeleton 4 is connected to the upper positioning structure 6 so as to slide on the iron core 3 under the control of the upper positioning structure 6 to adjust the relative position of the high-voltage side winding 1 and the iron core 3; an epoxy resin insulation structure is cast between the high-voltage side winding 1, the low-voltage side winding 2, the iron core 3, the upper positioning structure 6, the lower positioning structure 7 and the shell 8.

[0043] The working principle and technical effects of the above technical solution are as follows:

[0044] In the epoxy resin insulated electromagnetic voltage transformer of the present invention, a cable connector connected to the high-voltage side winding 1 and the low-voltage side winding 2 is provided on the shell 8, and the iron core 3 is connected to the shell 8 through the upper positioning structure 6 and the lower positioning structure 7. The assembly is very convenient. An epoxy resin insulation structure is poured between the high-voltage side winding 1, the low-voltage side winding 2, the iron core 3, the upper positioning structure 6, the lower positioning structure 7 and the shell 8 to form an electromagnetic voltage transformer using epoxy resin insulation as the insulating medium. After pouring, a long-term low-temperature infiltration curing epoxy resin process is adopted to enable the product to achieve high insulation level and low partial discharge in a small volume. The product is small in size and heavy. It has the characteristics of being light, oil-free, gas-free, and basically pollution-free to the environment, and the product basically requires no maintenance, which reduces costs; the first winding skeleton 4 is connected to the upper positioning structure 6, and the upper positioning structure 6 can be used to control the first winding skeleton 4 to slide on the iron core 3, thereby adjusting the relative position of the high-voltage side winding 1 on the first winding skeleton 4 and the iron core 3. By adjusting the relative position between the high-voltage side winding 1 and the iron core 3, it provides greater flexibility in the design and processing stages, which is conducive to the optimization of magnetic circuit distribution, measurement accuracy, heat dissipation performance, mechanical stability, electrical performance and other aspects, thereby improving the overall performance and working reliability of the mutual inductor.

[0045] The high-voltage side winding 1 is a stepped winding composed of six winding bodies 101 of different sizes. A U-shaped equalizing ring 102 is provided between the connecting ends of two adjacent winding bodies 101, and an annular equalizing ring 103 is provided at the end of the winding body 101 at the bottom end of the high-voltage side winding 1.

[0046] In the high-voltage side winding 1, since the electric field strength varies greatly at different positions, it is easy to cause local discharge and even damage the insulating material. The present invention uses a U-shaped equalizing ring 102 and an annular equalizing ring 103 to effectively reduce the unevenness of the electric field and reduce the risk of local discharge; in addition, the high-voltage side winding 1 will generate heat during operation. If the heat is unevenly distributed, it may cause the temperature in some areas to be too high, affecting the service life of the winding, and the design of the stepped winding can optimize the heat distribution and reduce the temperature of the hot spot area; in addition, the design of the stepped winding can better disperse the mechanical stress generated by the electromagnetic force, improve the mechanical strength of the winding, and reduce structural damage caused by uneven mechanical stress.

[0047] The high-voltage side winding 1 in the present invention is wound in multiple steps, and a U-shaped grading ring 102 is provided between the connection ends of two adjacent winding bodies 101. The end of the winding body 101 of the last step is provided with an annular grading ring 103, so that the electric field of the overall structure of the high-voltage side winding 1 is uniform, thereby breaking through the application limit of the epoxy resin insulation strength at the 72.5kV voltage level. The epoxy resin insulation structure is adopted to overcome the flammability, explosiveness and complex maintenance of oil-insulated products and the greenhouse gas use of SF6 gas-insulated products. The high-voltage side winding 1 adopts an original high and low voltage and multi-layer shielding technology with shielding at multiple steps, which is conducive to achieving better electrical performance indicators.

[0048] The wrapping structure of the high-voltage side winding 1 adopts a conical semiconductor structure with equipotential lines, so that the electric field in this part is more uniform.

[0049] The core 3 adopts a continuous wound core 3 structure to improve its internal electric field distribution, greatly simplify the shielding structure, and the low magnetic flux density design enables the product to withstand higher overvoltage, lightning impulse and operation impulse voltages, effectively preventing ferromagnetic resonance.

[0050] The first winding skeleton 4 is slidably connected to one side of the iron core 3, and the second winding skeleton 5 is fixedly connected to the other side of the iron core 3; the upper positioning structure 6 includes: an upper positioning frame 601 fixed above the iron core 3, and upper and lower sliders 602 are slidably provided in the regulating groove of the upper positioning frame 601, and the upper and lower sliders 602 are threadedly connected to the positioning screw 603 rotated on the upper positioning frame 601, and the upper and lower sliders 602 are connected to the first winding skeleton 4 through a connecting rod 604.

[0051] The upper positioning frame 601 is fixed above the iron core 3, and the upper and lower sliders 602 are connected to the positioning screw 603 through threads. The upper and lower sliders 602 can be controlled to move up and down in the adjustment groove of the upper positioning frame 601 by rotating the positioning screw 603. The connecting rod 604 connects the upper and lower sliders 602 and the first winding frame 4, so that the movement of the upper and lower sliders 602 can drive the connecting rod 604 to move up and down. The connecting rod 604 drives the first winding frame 4 to slide on one side of the iron core 3, and adjusts the precise adjustment of the high-voltage side winding 1 on the first winding frame 4, so that during the installation and debugging process, the position of the high-voltage side winding 1 can be adjusted as needed, thereby optimizing the electrical and mechanical properties of the high-voltage side winding 1. Since the first winding frame 4 can be slidably adjusted, it can ensure that its relative position with the second winding frame 5 is more precise, thereby improving the overall installation accuracy of the high-voltage side winding 1 and the low-voltage side winding 2.

[0052] The lower positioning structure 7 includes: a lower positioning frame 701 fixed below the iron core 3, a circular through-hole provided at the bottom of the lower positioning frame 701 for the positioning through-tube 702 to pass through, the bottom of the circular through-hole is connected to the conical penetration groove 703 on the lower surface of the lower positioning frame 701, and the top of the circular through-hole is connected to the rectangular groove in the middle of the lower positioning frame 701; the top of the positioning through-tube 702 is closed and the bottom is fixed to the bottom surface of the inner part of the shell 8; the positioning clamping column 704 slidingly arranged on the side of the positioning through-tube 702 is clamped on the bottom surface of the rectangular groove, and one end of the positioning clamping column 704 inserted into the positioning through-tube 702 is connected to the inner wall of the positioning through-tube 702 through a compression spring.

[0053] The structural setting of the lower positioning structure 7 is conducive to improving the efficiency of installing the iron core 3 inside the shell 8. The positioning tube 702 is pre-fixed and connected to the bottom surface of the inner part of the shell 8. During installation, the conical penetration groove 703 on the lower surface of the lower positioning frame 701 is controlled to contact the top of the positioning tube 702, and the conical penetration groove 703 is gradually brought into contact with the positioning column 704 slidingly arranged on the side of the positioning tube 702. The conical surface of the conical penetration groove 703 generates pressure on the positioning column 704, so that the positioning column 704 slides into the positioning tube 702 and compresses the compression spring, which is convenient for positioning the column 7 04 Through the circular perforation, after the positioning column 704 detaches from the circular perforation and enters the rectangular groove in the middle of the lower positioning frame 701, the positioning column 704 extends to the outside of the positioning tube 702 under the elastic force of the compression spring, and is clamped on the bottom surface of the rectangular groove, realizing the preliminary connection between the iron core 3 and the shell 8. At this time, the positioning tube 702 and the lower positioning frame 701 can rotate relative to each other. When pouring epoxy resin, the upper positioning structure 6 can be controlled to drive the iron core 3 to swing a certain amplitude with the axis of the positioning tube 702 as the center, so as to achieve slight stirring of the epoxy resin, which is conducive to the discharge of bubbles in the epoxy resin.

[0054] In the present invention, the lower positioning structure 7 is mainly used for the installation and positioning of the iron core 3 and the shell 8, and realizes efficient and precise installation through a specific structural design. The traditional installation method of the iron core and the shell may require complicated fixing steps, resulting in low installation efficiency. The design of the lower positioning structure 7 can simplify the installation process and improve the installation efficiency; the traditional installation method may be difficult to achieve precise alignment, and the lower positioning structure can achieve precise positioning and fixation through the design of the tapered penetration groove and the positioning column. In addition, during the epoxy resin pouring process, the residual bubbles will affect the insulation performance and mechanical strength. The swingable design of the lower positioning structure 7 can slightly stir the epoxy resin during pouring to help the bubbles to be discharged, thereby improving the filling quality and insulation performance of the epoxy resin.

[0055] More than one rectangular sleeve 801 is set above the interior of the shell 8; the rectangular sleeve 801 is sealed and slidably connected with a rectangular plate 802, and the rectangular plate 802 is inserted into the internal thread groove at one end of the rectangular sleeve 801 and is threadedly connected to the screw 803 rotated on the shell 8; the end of the rectangular plate 802 that passes through the outside of the rectangular sleeve 801 is inserted into the rectangular through-hole on the side of the upper positioning frame 601, and abuts against the side of the positioning screw 603; the top of the shell 8 is connected to a top cover 804 with a pouring hole and an exhaust hole, and the protrusion 805 on the lower surface of the top cover 804 is clamped in the two grooves on the upper surface of the upper positioning frame 601.

[0056] When pouring epoxy resin, the rectangular plate 802 is away from the rectangular perforations on the side of the upper positioning frame 601 to prevent it from affecting the swing of the iron core 3 and the lower positioning frame 701. After the pouring is basically completed, the protrusion 805 on the lower surface of the top cover 804 is clamped into the two grooves on the upper surface of the upper positioning frame 601, and the top cover 804 and the shell 8 are fixedly connected by bolts. Then, the epoxy resin can be supplemented through the pouring hole on the top of the shell 8 to ensure the density of the pouring. During the pouring process, the gas can be discharged through the exhaust hole. After the pouring is completely completed, the pouring hole and the exhaust hole can be blocked by plugging. The hole is closed and then a long-term low-temperature infiltration curing epoxy resin treatment is carried out; in addition, after the pouring is completed, the screw 803 is rotated to change the contact position of the screw 803 and the inner thread groove of the rectangular plate 802, thereby controlling the rectangular plate 802 to slide in the rectangular sleeve 801, making it easy to control the rectangular plate 802 to be inserted into the rectangular through-hole on the side of the upper positioning frame 601, thereby limiting the lateral position of the iron core 3, and controlling the rectangular plate 802 to contact the side of the positioning screw 603 to prevent the rotation of the positioning screw 603 from affecting the accuracy of the position of the high-voltage side winding 1, and the operation is very convenient.

[0057] The two heat dissipation pipes 806 that are horizontally arranged below the shell 8 are located below the iron core 3. The heat dissipation pipes 806 can directly contact the high-temperature area below the iron core 3, can quickly absorb the heat generated by the iron core 3, and transfer the heat from the high-temperature area to the heat dissipation pipes through heat conduction. The two ends of the heat dissipation pipes 806 can be connected to a cooling heat exchange medium, and the cooling heat exchange medium flows through the heat dissipation pipes 806. When the heat is transferred to the heat dissipation pipes 806, a convection heat transfer effect is generated, and the heat is effectively dissipated; when the heat dissipation pipes 806 are exposed to the outside of the shell 8, heat can be dissipated through natural convection and air flow; when the heat dissipation pipes 806 are connected to a cooling system (such as a fan or a cooling tower), heat dissipation can be accelerated by forced convection, which can quickly absorb the heat of the iron core 3, reduce heat accumulation, and improve the overall heat dissipation efficiency, thereby improving the device. The overall stability and reliability of the equipment; in addition, the heat dissipation pipe 806 is passed through the inside of the shell 8, which can effectively utilize the space of the shell 8, reduce the size and complexity of the external heat dissipation device, and simplify the structural design. The combination of the heat dissipation pipe 806 and the shell 8 makes the shell 8 itself a part of the heat dissipation system, enhances the heat dissipation capacity of the shell 8, and further improves the heat dissipation performance of the equipment. The design of the heat dissipation pipe 806 reduces the dependence on external cooling equipment, reduces operating costs and maintenance difficulty, and improves the compactness and integration of the equipment. The combination of the heat dissipation pipe 806 and the shell 8 is also conducive to improving the overall structural strength of the present invention, and can improve the tightness of the poured epoxy resin and the shell 8 during pouring.

[0058] A rotating column 807 is installed in each of the two heat dissipation tubes 806. The front ends of the two rotating columns 807 are rotatably connected to the lower ends of the two lifting links 808. The lifting columns 809 at the upper ends of the two lifting links 808 are slidably arranged in the horizontal slideway of the lifting frame 810. The lifting frame 810 is connected to a movable scraper frame 811 mounted on the outer side of the outer shell 8. The two ends of the movable scraper frame 811 are respectively connected to the two protective covers 813 on the side of the outer shell 8 through one or more springs 812. The two protective covers 813 are arranged on the outside of the two lead through-holes on the side of the outer shell 8; the rear end of one rotating column 807 is fixed with a vertical windward plate 814, and the rear end of the other rotating column 807 is fixed with a horizontal rain-facing plate 815 with a water collecting trough. The two heat dissipation pipes 806 can also be equipped with rotating columns 807 and other structures, and a movable scraper frame 811 is set on the outer side of the shell 8. The movable scraper frame 811 can be controlled to slide on the outer side of the shell 8 to clean the outer side of the shell 8, reduce the dirt on the outer side of the shell 8, and ensure the heat dissipation effect. A vertical windward plate 814 is fixed to the rear end of a rotating column 807. When the wind is strong, the vertical windward plate 814 can be blown to swing, thereby driving the rotating column 807 connected thereto to rotate at a certain angle. When the rotating column 807 rotates, it can drive the jacking link 808 connected thereto to swing, and the jacking column 809 on the jacking link 808 slides in the horizontal slideway of the jacking frame 810, so that the movable scraper frame 811 stretches the spring 812, thereby driving the movable scraper frame 811 to slide on the outer side of the shell 8 to clean the outer side of the shell 8, and when the wind is weak, the movable scraper frame 811 is between the spring 812 and its When the rain is small or the rain in the water collecting trough of the horizontal rain plate 815 is poured out, the movable scraper frame 811 is reset downwards under the spring 812 and its own gravity.

[0059] The first winding skeleton 4 includes: a skeleton sleeve 401 for winding and installing the high-voltage side winding 1, the inner side of the skeleton sleeve 401 sleeved on the iron core 3 is connected to the upper positioning structure 6; the outer side of the bottom of the skeleton sleeve 401 is connected to the wire rack 402 through a curved structure, the upper part of the wire rack 402 is connected to the first winding roller 403 and the guide plate 404 with cable perforations, the first winding roller 403 is located between the guide plate 404 and the skeleton sleeve 401; the second winding roller 403 is slidably connected in the longitudinal groove below the wire rack 402 05, the movable side plates 406 on both sides of the second winding roller 405 are slidably arranged on the side surfaces of the conductor frame 402; tensioning springs 407 are connected between the two movable side plates 406 and the two protrusions at the bottom of the conductor frame 402; the connection terminals of the high-voltage side winding 1 are passed through the top of the first winding roller 403 and the bottom of the second winding roller 405 in turn, and pass through the cable through-hole of the guide plate 404; the second winding frame 5 and the first winding frame 4 have the same structure, and the frame sleeve of the second winding frame 5 is fixed to the iron core 3 by bolts.

[0060] The skeleton sleeve 401 of the first winding skeleton 4 is used for the winding installation of the high-voltage side winding 1. The inner side of the skeleton sleeve 401 sleeved on the iron core 3 is connected to the upper positioning structure 6, which is convenient for sliding on the iron core 3 under the control of the upper positioning structure 6 to adjust the position of the high-voltage side winding 1. The terminal of the high-voltage side winding 1 passes through the top of the first winding roller 403 and the bottom of the second winding roller 405 in turn, and passes through the cable through-hole of the guide plate 404, so that after the terminal of the high-voltage side winding 1 is connected to the cable connector on the shell 8, the cable has a certain buffer space, which is convenient for adjusting the skeleton sleeve 401 and the high-voltage side winding 1 after the installation is completed. The position is adjusted so that it does not affect the adjustment of the position of the high-voltage side winding 1. During adjustment, the cable generates pressure on the second winding roller 405, and the second winding roller 405 slides in the longitudinal groove below the conductor rack 402, and stretches or relaxes the tensioning spring 407 to ensure the tension of the cable. In addition, the arrangement of the above structure is also convenient for coordinating with the upper positioning structure 6 and the iron core 3 to swing and eliminate bubbles, and does not affect the swing stirring effect. When the upper positioning structure 6 and the iron core 3 swing, the contact position of the cable with the second winding roller 405 and the cable perforation of the guide plate 404 changes, so that the cable can contact with the cast epoxy resin, thereby improving the insulation effect.

[0061] Example 2

[0062] See also Figures 1-13 , a manufacturing process, applied to the epoxy resin insulated electromagnetic voltage transformer, the process comprises the following steps:

[0063] Assemble the high-voltage side winding 1 wound on the first winding frame 4 on one side of the iron core 3;

[0064] Assemble the low-voltage side winding 2 wound on the second winding frame 5 on the other side of the core 3;

[0065] Connect the iron core 3 to the upper positioning structure 6 and the lower positioning structure 7, and connect the first winding skeleton 4 to the upper positioning structure 6;

[0066] Connect the upper positioning structure 6 and the lower positioning structure 7 to the housing 8, and adjust the relative position of the high-voltage side winding 1 and the iron core 3 on the first winding frame 4 through the upper positioning structure 6;

[0067] An epoxy resin insulation structure is poured between the high-voltage side winding 1, the low-voltage side winding 2, the iron core 3, the upper positioning structure 6, the lower positioning structure 7 and the shell 8, and is cured to form a finished product.

[0068] The manufacturing process of the epoxy resin insulated electromagnetic voltage transformer of the present invention is simple and effective, and can be installed quickly and conveniently, thus simplifying the design and manufacturing costs.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0071] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An epoxy resin insulated electromagnetic voltage transformer, characterized in that: include: High-voltage side winding, low-voltage side winding and iron core; the high-voltage side winding is connected to one side of the iron core through a first winding skeleton, and the low-voltage side winding is connected to the other side of the iron core through a second winding skeleton; The iron core is connected to the housing through an upper positioning structure and a lower positioning structure; the first winding skeleton is connected to the upper positioning structure so as to slide on the iron core under the control of the upper positioning structure to adjust the relative position of the high-voltage side winding and the iron core; An epoxy resin insulation structure is cast between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure and the shell; The lower positioning structure includes: a lower positioning frame fixed below the iron core; a circular through-hole is provided at the bottom of the lower positioning frame for the positioning tube to pass through; the bottom of the circular through-hole is connected to the conical penetration groove on the lower surface of the lower positioning frame; the top of the circular through-hole is connected to the rectangular groove in the middle of the lower positioning frame; the top of the positioning tube is closed and the bottom is fixed to the bottom surface of the inner shell; a positioning clamping column slidably provided on the side of the positioning tube is clamped on the bottom surface of the rectangular groove; the end of the positioning clamping column inserted into the positioning tube is connected to the inner wall of the positioning tube via a compression spring; One or more rectangular sleeves are provided above the interior of the housing; rectangular plates are sealed and slidably connected inside the rectangular sleeves, and the rectangular plates are inserted into the internal thread grooves at one end of the rectangular sleeves and are threadedly connected to the screws rotated on the housing; the end of the rectangular plates extending outside the rectangular sleeves is inserted into the rectangular through-holes on the side of the upper positioning frame and abuts against the side of the positioning screw; a top cover with a pouring hole and an exhaust hole is connected to the top of the housing, and a protrusion on the lower surface of the top cover is snap-fitted into two grooves on the upper surface of the upper positioning frame; The two heat dissipation pipes that are horizontally arranged under the outer shell are located under the iron core; rotating columns are rotated in the two heat dissipation pipes, and the front ends of the two rotating columns are rotatably connected to the lower ends of the two jacking connecting rods. The jacking columns at the upper ends of the two jacking connecting rods are slid in the horizontal slideway of the jacking frame, and the jacking frame is connected to the movable scraper frame mounted on the outer side of the outer shell. The two ends of the movable scraper frame are connected to the two protective covers on the side of the outer shell through one or more springs respectively, and the two protective covers are arranged on the outside of the two lead through-holes on the side of the outer shell; the rear end of one rotating column is fixed to the vertical windward plate, and the rear end of the other rotating column is fixed to the horizontal rain-facing plate with a water collecting trough.

2. The epoxy resin insulated electromagnetic voltage transformer according to claim 1, characterized in that: The high-voltage side winding is a stepped winding composed of six winding bodies of different sizes. A U-shaped voltage-grading ring is provided between the connecting ends of two adjacent winding bodies, and an annular voltage-grading ring is provided at the end of the winding body at the bottom end of the high-voltage side winding.

3. The epoxy resin insulated electromagnetic voltage transformer according to claim 1, characterized in that: The wrapping structure of the high-voltage side winding adopts a conical semiconductor structure with equipotential lines.

4. The epoxy resin insulated electromagnetic voltage transformer according to claim 1, characterized in that: The iron core adopts a continuous wound iron core structure.

5. The epoxy resin insulated electromagnetic voltage transformer according to claim 1, characterized in that: The first winding frame is slidably connected to one side of the iron core, and the second winding frame is fixedly connected to the other side of the iron core; the upper positioning structure includes: an upper positioning frame fixed above the iron core, and upper and lower sliders are slidably provided in the regulating groove of the upper positioning frame, and the upper and lower sliders are threadedly connected to the positioning screw rotated on the upper positioning frame, and the upper and lower sliders are connected to the first winding frame through a connecting rod.

6. The epoxy resin insulated electromagnetic voltage transformer according to claim 1, characterized in that: The first winding skeleton includes: a skeleton sleeve for winding and installing the high-voltage side winding, the inner side of the skeleton sleeve sleeve mounted on the iron core is connected to the upper positioning structure; the outer side of the bottom of the skeleton sleeve is connected to the wire rack through a bending structure, and the top of the wire rack is connected to the first winding roller and the guide plate with cable through holes, and the first winding roller is located between the guide plate and the skeleton sleeve; the second winding roller is slidably connected in the longitudinal groove below the wire rack, and the movable side plates on both sides of the second winding roller are slid on the side surfaces of the wire rack; tensioning springs are connected between the two movable side plates and the two protrusions at the bottom of the wire rack; the connection terminals of the high-voltage side winding are sequentially passed through the top of the first winding roller and the bottom of the second winding roller, and pass through the cable through holes of the guide plate; the second winding skeleton has the same structure as the first winding skeleton, and the skeleton sleeve of the second winding skeleton is fixed to the iron core by bolts.

7. A manufacturing process, applied to an epoxy resin insulated electromagnetic voltage transformer according to any one of claims 1 to 6, characterized in that: The process includes the following steps: Assembling the high-voltage side winding wound on the first winding frame on one side of the iron core; Assembling the low-voltage side winding wound on the second winding frame on the other side of the iron core; Connecting the iron core to the upper positioning structure and the lower positioning structure, and connecting the first winding skeleton to the upper positioning structure; Connecting the upper positioning structure and the lower positioning structure to the housing, and adjusting the relative position of the high-voltage side winding and the iron core on the first winding frame through the upper positioning structure; An epoxy resin insulation structure is poured between the high-voltage side winding, the low-voltage side winding, the iron core, the upper positioning structure, the lower positioning structure and the shell, and a finished product is formed after curing.

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