Transformer and electrical equipment

Abstract

The transformer comprises an iron core and a winding, the iron core comprises a main column iron core and two side column iron cores, the cross section area of each side column iron core is 50%-52% of the cross section area of the main column iron core, and the two side column iron cores are located on the two sides of the main column iron core respectively; the winding comprises a low-voltage winding and a high-voltage winding, the low-voltage winding is arranged on the outer side of the main column iron core in a double-layer spiral sleeving mode, and the high-voltage winding is arranged on the outer side of the low-voltage winding in an inner screen continuous structure sleeving mode. The transformer is of a single-phase three-column type structure, that is, the iron core of the transformer comprises the main column iron core and the two side column iron cores, the cross section area of the side column iron cores is 50%-52% of the cross section area of the main column iron core, the main column iron core is sleeved with the low-voltage winding and the high-voltage winding, and the high-voltage winding is sleeved with the low-voltage winding and the high-voltage winding. Therefore, the functions of electric energy transmission and voltage class conversion of the transformer are achieved, the overall dimension of the transformer is small, the occupied area of the transformer is saved, the transformer can adapt to the arrangement space of most transformers, and the adaptability of the transformer is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical engineering, and in particular to a transformer and electrical equipment. Background Technology

[0002] With the development of technology, electrical equipment is increasingly used in various fields, especially in energy, industry, and construction, where it is one of the most important pieces of equipment. As the core equipment for electrical energy conversion, the transformer is an indispensable type of electrical equipment. As a static electrical device that uses the principle of electromagnetic induction to change AC voltage, current, and impedance, the core function of a transformer is to realize the transmission of electrical energy and the conversion of voltage levels.

[0003] Currently, the main transformers for million-kilowatt nuclear power generating units produced by domestic transformer manufacturers all adopt a single-phase four-column iron core and a two-column coil structure. The capacity of each coil is 50% of the total capacity of the transformer. However, this transformer is large in size and has high requirements for on-site space, which cannot meet the current on-site transformer layout space requirements and has low adaptability. Utility Model Content

[0004] The present invention provides a transformer and electrical equipment to reduce the size of the transformer, save its space, meet most layout space requirements, and improve adaptability.

[0005] This utility model provides a transformer, which includes:

[0006] The iron core includes a main iron core and two side iron cores. The cross-sectional area of ​​the side iron cores is 50%-52% of the cross-sectional area of ​​the main iron core. The two side iron cores are located on both sides of the main iron core.

[0007] The winding includes a low-voltage winding and a high-voltage winding. The low-voltage winding is wound in a double-layer spiral on the outside of the main column core, and the high-voltage winding is wound in a continuous inner screen structure on the outside of the low-voltage winding.

[0008] In the transformer provided by this utility model, the transformer further includes an outgoing line device and a bushing. One end of the bushing is connected to the high-voltage winding and the outgoing line device, and the other end of the bushing is connected to an external power system.

[0009] In the transformer provided by this utility model, the outgoing line device includes an equalizing ball and a shielding tube. One end of the shielding tube is connected to the equalizing ball, and one end of the bushing is inserted into the inside of the equalizing ball and connected to the equalizing ball through an equipotential line.

[0010] In the transformer provided by this utility model, the transformer also includes a voltage regulating tap changer, the voltage regulating tap changer is provided with a terminal block covered with an insulating material on the outside, and one end of the terminal block is connected to the voltage regulating tap changer.

[0011] In the transformer provided by this utility model, the insulating component is insulating crepe paper.

[0012] In the transformer provided by this utility model, the transformer also includes an oil tank. The oil tank is provided with a copper shield and an oil tank magnetic shield. The copper shield is fixed to the inner side of the tank wall, and the oil tank magnetic shield is fixed inside the oil tank and grounded to the oil tank at one point through a grounding bolt.

[0013] In the transformer provided by this utility model, the oil tank further includes a tank cover, the outer surface of which is provided with an inwardly recessed bending structure; the transformer further includes a riser seat and a fixed seat, the riser seat includes a riser seat flange, the fixed seat is fixed on the bending structure, and the riser seat flange is fixed on the upper end of the fixed seat.

[0014] In the transformer provided by this utility model, the transformer further includes a main air pipe and a secondary air pipe. The main air pipe is connected to the secondary air pipe and the oil conservator. The secondary air pipe is connected to the riser and the main air pipe. An insulating component is provided at one end of the secondary air pipe connected to the main air pipe. The insulating component is used to block the loop current formed between the main air pipe and the secondary air pipe by the leakage magnetic flux generated by the high current output line on the low voltage side.

[0015] In the transformer provided by this utility model, the auxiliary air guide pipe includes a first flange and a second flange, which are fixedly connected by bolts; the insulation assembly includes a sealing gasket, an insulating sleeve and an insulating washer, the sealing gasket is located between the first flange and the second flange, the insulating sleeve is fitted onto the shank of the bolt, and the insulating washer is located between the head of the bolt and the first flange or the second flange.

[0016] This utility model also provides an electrical device, which includes:

[0017] A transformer, wherein the transformer is any one of the transformers described above.

[0018] The transformer of this application adopts a single-phase three-column structure, that is, the transformer core includes one main column core and two side column cores. The cross-sectional area of ​​the side column cores is 50%-52% of the cross-sectional area of ​​the main column core. The low-voltage winding and the high-voltage winding are mounted on the main column core, thereby realizing the function of power transmission and voltage level conversion of the transformer. The transformer has a small size and light weight, thus saving the floor space of the transformer, avoiding the influence of layout space, and can be adapted to the layout space of most transformers, improving its adaptability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of the iron core in an embodiment of this utility model;

[0021] Figure 2 This is a structural diagram of the combination of the wire outlet device and the sleeve in an embodiment of this utility model;

[0022] Figure 3 This is a structural diagram of the voltage regulating tap changer in the embodiment of this utility model;

[0023] Figure 4 This is a structural diagram of the oil tank and clamp in an embodiment of the present utility model;

[0024] Figure 5 This is a structural diagram of the clamp in an embodiment of the present utility model;

[0025] Figure 6 This is an assembly drawing of the box cover and the lifting seat in an embodiment of this utility model;

[0026] Figure 7 This is a structural diagram of the main air tube and the secondary air tube in an embodiment of this utility model;

[0027] Figure 8 This is an assembly diagram of the first flange, the second flange, and the insulation assembly in an embodiment of this utility model.

[0028] The labels for the attached figures are as follows:

[0029] 1. Iron core; 11. Main column iron core; 12. Side column iron core; 13. Clamping component; 131. Clamping component magnetic shielding component; 132. Magnetic shielding insulation component; 2. Outgoing line device; 21. Equalizing ball; 22. Shielding tube; 23. Equipotential line; 24. Support insulation component; 3. Sleeve; 4. Voltage regulating tap changer; 41. Terminal block; 5. Oil tank; 51. Copper shielding component; 52. Oil tank magnetic shielding component; 53. Tank cover; 531. Bending structure; 6. Elevator seat; 61. Fixed seat; 62. Elevator seat flange; 7. Main air pipe; 8. Secondary air pipe; 81. Insulation assembly; 811. Sealing gasket; 812. Insulation sleeve; 813. Insulation gasket; 82. First flange; 83. Second flange; 9. Bolt. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] Reference Figures 1 to 8 The diagram illustrates an embodiment of the transformer and electrical equipment of this utility model. The transformer includes a core 1 and windings. The core 1 includes a main core 11 and two side cores 12. The cross-sectional area of ​​the side cores 12 is 50%-52% of the cross-sectional area of ​​the main core 11. The two side cores 12 are located on both sides of the main core 11. The windings include a low-voltage winding and a high-voltage winding. The low-voltage winding is wound in a double-layer spiral configuration on the outside of the main core 11, and the high-voltage winding is wound in a continuous inner-screen configuration on the outside of the low-voltage winding.

[0032] Specifically, the transformer is a single-phase three-limb transformer, which includes an iron core 1 and windings. The iron core 1 is made of high-permeability, low-loss high-quality cold-rolled silicon steel sheets stacked together to form a closed magnetic circuit and enhance magnetic field coupling. The iron core 1 has a single-phase three-limb structure and is fully obliquely joined. The core 1 includes a main core 11 and two side cores 12. The main core 11 and the side cores 12 are arranged in parallel, and the two side cores 12 are respectively located on both sides of the main core 11 and are adjacent to the main core 11. The cross-sectional area of ​​the side cores 12 is 50%-52% of the cross-sectional area of ​​the main core 11. The capacity of the main core 11 is increased from 50% to 100% of the total capacity of the transformer. The upper and lower ends of the main core 11 and the two side cores 12 are connected by an upper yoke and a lower yoke, respectively, so that the main core 11 and the two side cores 12 form a closed magnetic circuit.

[0033] The winding transmits energy through electromagnetic induction. The winding includes a low-voltage winding and a high-voltage winding. The low-voltage winding is used to output or receive low voltage. The low-voltage winding is wound close to the outer surface of the main column core 11 and adopts a double-layer spiral structure. That is, the low-voltage winding is sleeved on the outside of the main column core 11 in a double-layer spiral structure. The conductor cross-sectional area of ​​the low-voltage winding is large, which is suitable for large current (higher current on the low-voltage side). The voltage of the low-voltage winding is low, and the insulation requirements are small. Therefore, setting the low-voltage winding close to the main column core 11 can reduce the thickness of the insulation material. At the same time, the temperature of the main column core 11 is low, which is conducive to the heat dissipation of the large current of the low-voltage winding.

[0034] The high-voltage winding is used to receive or output high voltage. The high-voltage winding is wrapped around the low-voltage winding and adopts an inner continuous shield structure. That is, the high-voltage winding is sleeved on the outside of the low-voltage winding with an inner continuous shield structure. The electric field distribution is optimized by segmented winding and shielding layer. Since the high-voltage winding requires a thicker insulation layer, the high-voltage winding is located away from the main column iron core 11. The outer space is sufficient to facilitate the arrangement of insulating paper, oil channels or shielding layer. Moreover, the high-voltage winding is away from the main column iron core 11, so its heat dissipation conditions are better.

[0035] The windings achieve voltage rise and fall through electromagnetic induction. The high-voltage winding focuses on long-distance and efficient transmission, while the low-voltage winding focuses on safe power supply.

[0036] More specifically, the low-voltage winding leads are all located at the upper end of the iron core 1, and the double-layer coils of the low-voltage winding are connected in parallel via copper busbars. Meanwhile, the high-voltage winding has a tapped section, uses a center-entry wire, and employs an inner-screen continuous type at the first end, with the remaining sections being continuous, to increase the inter-turn capacitance at the ends, effectively improving the distribution of the impact potential and gradient of the high-voltage winding, and increasing the insulation safety margin; the low-voltage winding is helical, and the transposed conductors are all self-adhesive transposed conductors, reducing eddy current losses in the coil.

[0037] The transformer of this application adopts a single-phase three-column structure, that is, the core 1 of the transformer includes one main column core 11 and two side column cores 12. The cross-sectional area of ​​the side column cores 12 is 50%-52% of the cross-sectional area of ​​the main column core 11. The low-voltage winding and the high-voltage winding are mounted on the main column core 11, thereby realizing the function of power transmission and voltage level conversion of the transformer. The transformer has a small size and light weight, thereby saving the floor space of the transformer, avoiding the influence of the layout space, and can be adapted to the layout space of most transformers, improving its adaptability.

[0038] In one embodiment, reference is made to Figure 2As shown, the transformer also includes a lead-out device 2 and a bushing 3. One end of the bushing 3 is connected to the high-voltage winding and the lead-out device 2, and the other end of the bushing 3 is connected to an external power system. Specifically, the outgoing line device 2 and the bushing 3 are connection components between the high-voltage winding of the transformer and the external power system, used for voltage equalization and ground insulation. The outgoing line device 2 is fixed to the transformer body by an insulating component, thus being fixed inside the oil tank 5. One end of the outgoing line device 2 is connected to one end of the bushing 3, and the other end of the bushing 3 passes through the tank cover 53 of the oil tank 5 and is located outside the oil tank 5, thereby connecting to the external power system. One end of the bushing 3 is connected to the high-voltage winding of the transformer through an internal lead, and the other end of the bushing 3 is connected to the external power system. Therefore, the high-voltage winding, the bushing 3, the outgoing line device 2, and the external power system form a line channel. The lines of the external power system and the connection lines of the high-voltage winding are located in the bushing 3 and the line channel. The bushing 3 and the outgoing line device 2 can perform voltage equalization and ground insulation on the lines of the external power system and the connection lines of the high-voltage winding, ensuring the safety of the lines of the external power system and the connection lines of the high-voltage winding.

[0039] In a specific embodiment, refer to Figure 2 As shown, the outgoing line device 2 includes an equalizing sphere 21 and a shielding tube 22. One end of the shielding tube 22 is connected to the equalizing sphere 21, and one end of the bushing 3 is inserted into the equalizing sphere 21 and connected to the equalizing sphere 21 through an equipotential line 23. Specifically, the outgoing line device 2 includes an equalizing sphere 21 and a shielding tube 22. The equalizing sphere 21 is used to distribute the electric field uniformly, thereby reducing the local field strength, avoiding corona discharge or insulation breakdown, and thus ensuring the stable operation of the high-voltage side of the transformer. The shielding tube 22 is used to uniformly distribute the electric field, and the leads of the high-voltage winding are placed inside the shielding tube 22 to prevent insulation breakdown.

[0040] The equalizing ball 21 is located between the shielding tube 22 and the bushing 3. One end of the equalizing ball 21 is connected to one end of the bushing 3, and the other end of the equalizing ball 21 is connected to one end of the shielding tube 22. The other end of the bushing 3 is connected to the external power system, thereby ensuring the safety of the external power system lines and the connection lines of the high-voltage winding. At the same time, one end of the bushing 3 is inserted into the equalizing ball 21, and one end of the bushing 3 is connected to the equalizing ball 21 through the equipotential line 23. The equipotential line 23 balances the potential between the equalizing ball 21 and the bushing 3, so that there is no potential difference between them after the equalizing ball 21 and the bushing 3 are connected, avoiding affecting the operation of the transformer and improving the stability of the transformer.

[0041] More specifically, the lead wire of the high-voltage winding is located inside the shielding tube 22, and is connected to the internal lead wire of the bushing 3 via the equalizing ball 21 along the direction of the shielding tube 22. That is, the connection line of the high-voltage winding and the internal lead wire of the bushing 3 is located inside the outgoing device 2 and the bushing 3, thereby improving the stability of the power transmission of the transformer.

[0042] Meanwhile, the sleeve 3 does not need to be fixedly connected to the equalizing ball 21, but is only connected through the equipotential line 23, which reduces the installation difficulty of the sleeve 3 and the equalizing ball 21 and improves the installation efficiency.

[0043] More specifically, the end of the equalizing ball 21 connected to the sleeve 3 is provided with a through hole, and the size of the through hole can be designed differently to match the terminal size of the sleeve 3, so as to facilitate the insertion of one end of the sleeve 3 into the inside of the equalizing ball 21 and improve installation efficiency.

[0044] More specifically, the outer surface of the equalizing ball 21 adopts a multi-layer oil gap segmentation structure, which is an insulating structure on the outer surface of the equalizing ball 21. This structure can effectively reduce the electric field strength between the outer surface of the equalizing ball 21 and the tank wall of the oil tank 5, thereby further improving the safety of the transformer during long-term operation.

[0045] More specifically, the outgoing line device 2 further includes a supporting insulating member 24, which is fixed to the transformer body. The equalizing ball 21 and the shielding tube 22 are fixed to the supporting insulating member 24, and one end of the shielding tube 22 passes through the opening of the supporting insulating member 24 and connects to the equalizing ball 21. Specifically, the outgoing line device further includes a supporting insulating member 24, which supports and insulates the shielding tube 22 and the equalizing ball 21. One side of the supporting insulating member 24 is fixedly connected to the transformer body, and the equalizing ball 21 and the shielding tube 22 are fixedly connected to the other side of the supporting insulating member 24. One end of the shielding tube 22 passes through the opening of the supporting insulating member 24 and connects to the equalizing ball 21, thereby allowing the lead of the high-voltage winding to be located inside the shielding tube 22 and connected to the internal lead of the bushing 3 along the direction of the shielding tube 22 via the equalizing ball 21.

[0046] In one embodiment, reference is made to Figure 3As shown, the transformer also includes a voltage regulating tap changer 4, which has a terminal block 41 covered with an insulating material on the outside, and one end of the terminal block 41 is connected to the voltage regulating tap changer 4. Specifically, the transformer also includes a voltage regulating tap changer 4, which is a key component for adjusting the output voltage of the transformer. Voltage adjustment is achieved by changing the effective turns ratio of the winding. The voltage regulating tap changer 4 is connected to the high-voltage winding and has a terminal block 41 for connecting to it. Therefore, one end of the terminal block 41 is connected to the voltage regulating tap changer 4, thereby improving its safety and stability. The outer side of the terminal block 41 is covered with an insulating material to enhance its ground safety. Therefore, providing an insulating material on the outer side of the terminal block 41 significantly reduces the insulation distance between the voltage regulating tap changer 4 and the tank wall of the transformer's oil tank 5, further reducing the overall size of the transformer, decreasing its footprint, saving space, and improving its adaptability.

[0047] In a specific embodiment, the insulating component is insulating crepe paper (not shown in the figure). Specifically, the insulating component covers the outside of the terminal 41. To improve the assembly efficiency between the insulating component and the terminal 41, insulating crepe paper is used for the insulating component, which is simple to install and has low production cost.

[0048] More specifically, the thickness of the insulating component is set to 6mm, which ensures that the insulating component insulates the terminal 41 while reducing production costs and the space occupied by the terminal 41.

[0049] More specifically, in this embodiment, the terminal block 41 is made of insulated copper rod; multiple terminals 41 are provided, and the multiple terminals 41 are spaced apart along the circumference of the voltage regulating tap switch 4 on the outer edge of the voltage regulating tap switch 4, thereby improving the safety of the voltage regulating tap switch 4, while ensuring that the terminals 41 do not affect the operation of the voltage regulating tap switch 4.

[0050] In one embodiment, reference is made to Figure 4As shown, the transformer also includes an oil tank 5. The oil tank 5 is provided with a copper shield 51 and an oil tank magnetic shield 52. The copper shield 51 is fixed to the inner side of the tank wall of the oil tank 5, and the oil tank magnetic shield 52 is fixed inside the oil tank 5 and grounded to the oil tank 5 at one point through a grounding bolt. Specifically, the transformer also includes an oil tank 5, which forms a sealed device space. The iron core 1, the winding, the outgoing line device 2, and the voltage regulating tap changer 4 are all installed in the device space. To control the leakage flux of the transformer and avoid overheating, leakage flux shielding measures need to be set on the oil tank 5. In this embodiment, a copper shield 51 and an oil tank magnetic shield 52 are provided on the inner wall of the oil tank 5. The copper shield 51 is directly welded to the inner wall of the oil tank 5, and the oil tank magnetic shield 52 is fixed to the inside of the oil tank 5 by a fixing member and grounded to the oil tank 5 at one point by a grounding bolt. The copper shield 51 and the oil tank magnetic shield 52 are arranged along the inner wall surface of the oil tank 5, which can effectively reduce the leakage flux entering the oil tank 5, so as to prevent the tank wall and the edge of the oil tank 5 from overheating and reduce stray losses. The oil tank magnetic shield 52 is grounded at one point, and the rest is reliably insulated from the oil tank 5.

[0051] In this embodiment, by employing a coupled leakage magnetic shielding measure that combines the copper shield 51 and the oil tank magnetic shield 52, the overheating problem of the metal structural components of the transformer under high leakage magnetic flux can be effectively solved.

[0052] In another embodiment, reference is made to Figure 7 As shown, based on meeting the potential insulation distance between the winding and the oil tank 5, the overall structure of the oil tank 5 is designed and optimized according to the arrangement of the bushing 3 and the voltage regulating tap changer 4, thereby reducing the size of the oil tank 5. This ensures both the safety of the transformer insulation and the mechanical strength of the oil tank 5, and also provides a more compact product for the capacity expansion and replacement of the main transformer.

[0053] In a specific embodiment, refer to Figure 4 and Figure 5As shown, the iron core 1 is provided with a clamp 13, which is used to clamp the iron core 1. The clamp 13 is provided with a clamp magnetic shield 131, which is fixed at the fixing point between the clamp 13 and the iron core 1. Specifically, the iron core 1 is provided with a clamp 13, which is used to clamp the iron core 1. The clamp 13 tightly clamps the upper and lower yokes and column of the iron core 1 by bolts or welding to prevent the laminations of the iron core 1 from loosening, shifting or deforming. The clamp 13 is provided with a clamp magnetic shield 131, which is located at the fixing point between the clamp 13 and the iron core 1, and is located on the side of the clamp 13 away from the iron core 1. The clamp magnetic shield 131 is used to shield the leakage magnetic flux of the clamp 13 to prevent the clamp 13 from overheating.

[0054] In this embodiment, the clamp magnetic shield 131 includes a first connecting section and a second connecting section. The first connecting section and the second connecting section are vertically connected to fix them to both sides of the clamp 13, thereby improving the shielding effect of the clamp magnetic shield 131.

[0055] More specifically, a magnetic shielding insulator 132 is provided between the clamp 13 and the clamp magnetic shield 131. The size of the magnetic shielding insulator 132 is the same as that of the clamp magnetic shield 131, so as to provide insulation for the clamp magnetic shield 131.

[0056] In a specific embodiment, refer to Figure 6 As shown, the oil tank 5 also includes a tank cover 53, the outer surface of which has an inwardly recessed bending structure 531; the transformer also includes a riser seat 6 and a fixed seat 61, the riser seat 6 including a riser seat flange 62, the fixed seat 61 being fixed to the bending structure 531, and the riser seat flange 62 being fixed to the upper end of the fixed seat 61. Specifically, the oil tank 5 also includes a tank cover 53, the tank cover 53 being located at the top of the oil tank 5, the outer surface of the tank cover 53 having a bending structure 531 recessed towards the interior of the oil tank 5; the transformer also includes a riser seat 6 and a fixed seat 61, the riser seat 6 being used to support and fix the high-voltage bushing or low-voltage bushing of the transformer, and the fixed seat 61 being used to fixally connect the tank cover 53 and the riser seat 6.

[0057] The riser seat 6 includes a riser seat flange 62. The fixed seat 61 is used to fix the cover 53 and the riser seat flange 62. The riser seat flange 62 is used to fix the fixed seat 61 and other structural components of the riser seat 6, such as enclosed busbar cylinders, low-voltage bushings 3, enclosed busbar terminals, etc. That is, one side of the fixed seat 61 is fixed to the bending structure 531, and the other side of the fixed seat 61 is fixedly connected to the riser seat flange 62. That is, the riser seat flange 62 is fixed to the upper end of the fixed seat 61. Therefore, there is a certain distance between the riser seat flange 62 and the cover 53, avoiding direct contact between the riser seat flange 62 and the cover 53. When water droplets fall on the cover 53, the water will collect in the bending structure 531 and will not directly contact the riser seat flange 62, thereby avoiding the problem of water accumulation and rust on the riser seat flange 62.

[0058] More specifically, the total height of the fixed seat 61 and the riser flange 62 is equal to the depth of the bending structure 531, so that the upper surface of the riser flange 62 is flush with the outer surface of the cover 53, thereby improving the structural stability of the transformer.

[0059] More specifically, the riser flange 62 adopts a through-hole bolt structure, that is, the connection between the riser flange 62 and the enclosed busbar cylinder is fixed by bolts passing through the through holes and being locked with nuts, in order to further avoid the problem of water accumulation and rust on the riser flange 62.

[0060] In a specific embodiment, refer to Figure 7 As shown, the transformer also includes a main air pipe 7 and a secondary air pipe 8. The main air pipe 7 is connected to the secondary air pipe 8 and the oil conservator. The secondary air pipe 8 is connected to the riser 6 and the main air pipe 7. An insulation component 81 is provided at one end of the secondary air pipe 8 connected to the main air pipe 7. The insulation component 81 is used to block the loop current formed between the main air pipe 7 and the secondary air pipe 8 by the leakage magnetic flux formed by the high current output line on the low voltage side. Specifically, the transformer also includes a main gas pipe 7 and a secondary gas pipe 8. The main gas pipe 7 is the connection channel between the transformer body and the oil conservator, that is, the main gas pipe 7 connects to the secondary gas pipe 8 and the oil conservator. When the transformer oil expands due to temperature rise or contracts due to cooling, the main gas pipe 7 connects the oil tank 5 and the oil conservator. The secondary gas pipe 8 connects the riser 6 and the main gas pipe 7. The main function of the secondary gas pipe 8 is to collect the gas generated by the operating transformer into the main gas pipe 7. A gas relay is installed between the main gas pipe 7 and the oil conservator, and the gas can eventually be collected into the gas relay.

[0061] During the operation of the transformer, when the leakage magnetic field generated by the low-voltage lead of the transformer passes through the circuit, it will generate a large current in the circuit of the main air pipe 7 and the secondary air pipe 8. The leakage magnetic field of the low-voltage lead will form a large current loop in the main air pipe 7 and the secondary air pipe 8, which will lead to local overheating of the flange of the secondary air pipe 8. In order to avoid overheating caused by leakage magnetic field circulation, in this embodiment, the insulation component 81 is provided at the end where the secondary air pipe 8 is connected to the main air pipe 7. The insulation component 81 is used to block the leakage magnetic field circulation between the secondary air pipe 8 and the main air pipe 7, avoid the formation of a current loop between the secondary air pipe 8 and the main air pipe 7, and thus avoid overheating of the flange of the secondary air pipe 8, ensuring the normal operation of the transformer.

[0062] In one embodiment, reference is made to Figure 8 As shown, the secondary air guide pipe 8 includes a first flange 82 and a second flange 83, which are fixedly connected by bolts 9; the insulating assembly 81 includes a sealing gasket 811, an insulating sleeve 812, and an insulating washer 813. The sealing gasket 811 is located between the first flange 82 and the second flange 83, the insulating sleeve 812 is fitted onto the shank of the bolt 9, and the insulating washer 813 is located between the head of the bolt 9 and the first flange 82 or the second flange 83. Specifically, the auxiliary air guide pipe 8 includes a first flange 82 and a second flange 83. The first flange 82 and the second flange 83 are used to fix the auxiliary air guide pipe 8 and other structural components of the transformer. The first flange 82 and the second flange 83 are fixedly connected vertically, and the first flange 82 and the second flange 83 are fixedly connected by bolts 9. That is, both the first flange 82 and the second flange 83 are provided with fixing holes. The end of the bolt 9 passes through the fixing holes of the first flange 82 and the second flange 83 in sequence and is locked with a nut. Since the bolt 9 is a metal structure, it will cause the first flange 82 and the second flange 83 to form a circuit. Therefore, the insulating component 81 is provided between the first flange 82 and the second flange 83.

[0063] The insulating assembly 81 includes a sealing gasket 811, an insulating sleeve 812, and an insulating washer 813. The sealing gasket 811 is disposed between the first flange 82 and the second flange 83, and is used to isolate and seal the first flange 82 and the second flange 83, preventing the first flange 82 and the second flange 83 from directly contacting each other and forming a circuit. The insulating sleeve 812 is sleeved on the shank of the bolt 9, that is, the insulating sleeve 812 insulates the portion of the bolt 9 located in the fixing hole of the first flange 82 and the second flange 83. The insulating sleeve 812 is located in the fixing hole and between the shank of the bolt 9 and the first flange 82 and the second flange 83, thereby preventing the shank of the bolt 9 from directly contacting the first flange 82 and the second flange 83 and forming a circuit. The insulating washer 813 is located between the head of the bolt 9 and the first flange 82 or the second flange 83, that is, the insulating washer 813 isolates the head of the bolt 9 from direct contact with the first flange 82 or the second flange 83.

[0064] Therefore, in this embodiment, the sealing gasket 811, the insulating sleeve 812, and the insulating washer 813 are used to insulate the first flange 82, the second flange 83, and the bolt 9, so as to prevent the first flange 82, the second flange 83, and the bolt 9 from forming a circuit. This insulates the secondary air guide pipe 8, blocks the leakage magnetic current circulating in the circuit of the secondary air guide pipe 8 and the main air guide pipe 7 due to low voltage and high current, avoids the problem of local overheating of the pipeline during the operation of the transformer, and ensures the normal operation of the transformer.

[0065] More specifically, since the large current on the low-voltage output side will generate leakage flux and cause circulating current, the insulation component 81 can isolate the circulating current to prevent local overheating. Therefore, the insulation component 81 is also provided in the middle of the main gas pipe 7.

[0066] This application also provides an electrical device (not shown in the figure), which includes a transformer, which is any of the transformers described above. Since the transformer has been described in detail in the above embodiments, it will not be described again here.

[0067] The electrical equipment described in this application, due to the use of the transformer, has a small size and high adaptability, thereby reducing the area occupied by the electrical equipment, making it suitable for most scenarios and improving its competitiveness.

[0068] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A transformer, characterized by The transformer comprises: a core comprising a main column core and two side column cores, the cross-sectional area of the side column cores being 50%-52% of the cross-sectional area of the main column core, and the two side column cores being located on the two sides of the main column core, respectively; windings comprising low-voltage windings and high-voltage windings, the low-voltage windings being arranged in a double-layer spiral manner on the outside of the main column core, and the high-voltage windings being arranged in an inner-screen continuous structure on the outside of the low-voltage windings.

2. The transformer of claim 1, wherein, The transformer further comprises a lead-out device and a bushing, one end of the bushing being connected to the high-voltage windings and the lead-out device, and the other end of the bushing being connected to an external power system.

3. The transformer of claim 2, wherein, The lead-out device comprises a voltage equalizing ball and a shielding tube, one end of the shielding tube being connected to the voltage equalizing ball, and one end of the bushing being inserted into the voltage equalizing ball and connected to the voltage equalizing ball through an equipotential line.

4. The transformer of claim 1, wherein, The transformer further comprises a voltage regulating tap changer, the voltage regulating tap changer being provided with a terminal having an insulating member covering the outside of the terminal, and one end of the terminal being connected to the voltage regulating tap changer.

5. The transformer of claim 4, wherein, The insulating member is insulating crepe paper.

6. The transformer of claim 1, wherein, The transformer further comprises an oil tank, the oil tank being provided with a copper shielding member and an oil tank magnetic shielding member, the copper shielding member being fixedly arranged on the inside of the tank wall of the oil tank, and the oil tank magnetic shielding member being fixedly arranged in the inside of the oil tank and grounded to the oil tank through a grounding bolt.

7. The transformer of claim 6, wherein, The oil tank further comprises a tank cover, the outer surface of the tank cover being provided with a bending structure recessed inwardly; the transformer further comprises a lifting seat and a fixing seat, the lifting seat comprising a lifting seat flange, and the fixing seat being fixedly arranged on the bending structure, and the lifting seat flange being fixedly arranged on the upper end of the fixing seat.

8. The transformer of claim 7, wherein, The transformer further comprises a main gas guide pipe and a secondary gas guide pipe, the main gas guide pipe being connected to the secondary gas guide pipe and an oil storage tank, the secondary gas guide pipe being connected to the lifting seat and the main gas guide pipe, and one end of the secondary gas guide pipe connected to the main gas guide pipe being provided with an insulating assembly for blocking the loop current formed between the main gas guide pipe and the secondary gas guide pipe by the leakage magnetic field formed by the large current lead-out on the low-voltage side.

9. The transformer of claim 8, wherein, The secondary gas guide pipe comprises a first flange and a second flange, the first flange and the second flange being fixedly connected through bolts; the insulating assembly comprises a sealing gasket, an insulating sleeve and an insulating gasket, the sealing gasket being located between the first flange and the second flange, the insulating sleeve being sleeved on the rod portion of the bolt, and the insulating gasket being located between the head portion of the bolt and the first flange or the second flange.

10. An electrical device, characterized by The transformer is the transformer according to any one of claims 1-9. ​

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