Single-phase transformer

Abstract

The application relates to a single-phase transformer, comprising a core comprising one main column and at least two side columns; a first winding and a second winding wound on the main column; an excitation winding and a voltage regulating winding wound on any side column; and a tap switch. The first winding is a primary winding, the second winding is a secondary winding, and the first winding is a low-voltage winding / high-voltage winding, and the second winding is a high-voltage winding / low-voltage winding; the excitation winding is connected in parallel with the first winding; and the tap switch connects the second winding with the voltage regulating winding. The single-phase transformer adopts a structure of primary-side side-column excitation and secondary-side voltage regulation, adjusts the output voltage, has simple structure, small size, good reliability, low manufacturing cost, and the first winding and the second winding are wound on the main column, and the excitation winding and the voltage regulating winding are wound on any side column, so that the winding turn number limit can be avoided to a certain extent, the adjustable range of the transformer output voltage is increased, and the application scenarios of the single-phase transformer are expanded.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a single-phase transformer. Background Art

[0002] With the increasing development of current industry and economy, traditional transformers are unable to meet the current demand for industrial electricity. Single-phase transformers with many advantages such as low loss, light weight, small size and low cost have come into being and have been widely used in ultra-high voltage and large-capacity power grids.

[0003] Traditional single-phase transformers use a single-column winding method, with all windings wound on a central core column. Output voltage regulation is based on the constant magnetic flux voltage regulation principle. Consequently, traditional single-phase transformers are limited by the number of winding turns per core column, resulting in a narrow output voltage adjustment range. Summary of the Invention

[0004] Based on this, it is necessary to provide a single-phase transformer with a large adjustable output voltage range.

[0005] A single-phase transformer, comprising:

[0006] An iron core comprising a main column and at least two side columns;

[0007] a first winding and a second winding wound on the main column;

[0008] The excitation winding and voltage regulating winding wound on any side column;

[0009] and tap changers;

[0010] The first winding is a primary winding, the second winding is a secondary winding, the first winding is a low-voltage winding / high-voltage winding, and the second winding is a high-voltage winding / low-voltage winding; the excitation winding is connected in parallel with the first winding; the tap changer connects the second winding and the voltage regulating winding.

[0011] In one embodiment, the iron core is a single-phase three-column iron core structure, including a main column, two side columns, and an upper iron yoke and a lower iron yoke; the two side columns are respectively arranged on both sides of the main column; the first winding and the second winding are wound on the main column; the excitation winding and the voltage regulating winding are wound on any side column.

[0012] In one embodiment, the low voltage winding is close to the main column; the high voltage winding is sleeved on the low voltage winding and wound along the outer periphery of the low voltage winding.

[0013] In one embodiment, the excitation winding is close to the side pole; the voltage regulating winding is sleeved on the excitation winding and wound along the outer periphery of the excitation winding.

[0014] In one embodiment, the low voltage winding is a double-layer spiral winding structure.

[0015] In one embodiment, the high voltage winding is a tangled winding structure.

[0016] In one embodiment, the excitation winding and the voltage regulating winding both use self-adhesive transposed conductors.

[0017] In one embodiment, an oil guide baffle is arranged in the winding gap of the high-voltage winding.

[0018] In one embodiment, the tap changer is a linear voltage regulating tap changer.

[0019] In one embodiment, the single-phase transformer is a step-up transformer; the first winding is a low-voltage winding, and the second winding is a high-voltage winding.

[0020] The above-mentioned single-phase transformer adopts a structure with side-column excitation on the primary side and voltage regulation on the secondary side to adjust the output voltage. It not only has a simple structure, small size, good reliability and low manufacturing cost, but also the first winding and the second winding are wound on the main column, and the excitation winding and the voltage regulation winding are wound on any side column. This can avoid the limitation of the number of winding turns to a certain extent, increase the adjustable range of the transformer output voltage, and help expand the application scenarios of single-phase transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Schematic diagram of the structure of a single-phase transformer in one embodiment;

[0023] Figure 2 Schematic diagram of winding connection of a single-phase transformer in one embodiment. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0026] It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements herein, but these elements are not limited by these terms. These terms are used solely to distinguish a first element from another element. For example, a first winding may be referred to as a second winding, and similarly, a second winding may be referred to as a first winding, without departing from the scope of this application. The first winding and the second winding are both windings, but they are not the same winding.

[0027] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0028] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0029] In one embodiment, Figure 1 As shown, a single-phase transformer is provided, comprising: an iron core 100 comprising a main leg and at least two side legs; a first winding 200 and a second winding 300 wound on the main leg; an excitation winding 400 and a voltage regulating winding 500 wound on either side leg; and a tap changer (not shown). The first winding 200 is the primary winding; the second winding 300 is the secondary winding. The first winding 200 is a low-voltage winding / high-voltage winding, while the second winding 300 is a high-voltage winding / low-voltage winding. The excitation winding 400 is connected in parallel with the first winding 200; the tap changer connects the second winding 300 and the voltage regulating winding 500.

[0030] The type of the iron core 100 is not unique; for example, it can be a three-column structure or a five-column structure. The first winding 200 is a low-voltage winding / high-voltage winding, and the second winding 300 is a high-voltage winding / low-voltage winding, which means that the first winding 200 is a low-voltage winding and the second winding 300 is a high-voltage winding; or the first winding 200 is a high-voltage winding and the second winding 300 is a low-voltage winding. Furthermore, a design principle of arranging the windings in order of voltage from inside to outside can be adopted, with the low-voltage winding closer to the main column than the high-voltage winding, that is, when the first winding 200 is a low-voltage winding, the first winding 200 is located on the inside; when the first winding 200 is a high-voltage winding, the first winding 200 is located on the outside.

[0031] In addition, the excitation winding 400, also known as the excitation winding, is a coil winding that can generate a magnetic field. The winding method of each winding is not unique. For example, an inner screen continuous structure, a tangled continuous structure, or a full continuous structure can be adopted. Furthermore, the type of tap changer is not unique. For example, it can be an on-load tap changer or a no-load tap changer. The on-load tap changer can also be a positive and negative voltage regulating on-load tap changer, a linear voltage regulating on-load tap changer, or a coarse and fine voltage regulating on-load tap changer. The tap changer includes at least two gears, which can change the number of connected turns of the voltage regulating winding 500. It can be understood that when the voltage regulating winding 500 is not connected, one end of the tap changer is connected to the end of the second winding 300, and the other end is directly led out as a connection terminal. In one embodiment, the tap changer is a linear voltage-regulating tap changer, which can reduce the number of coil turns. On the one hand, this is beneficial to reducing the material cost of the single-phase transformer. On the other hand, the tap changer is connected in series with the voltage-regulating winding when in rated tap mode, and does not provide voltage regulation when in the most negative tap mode. This can reduce the load loss at the most negative tap mode, reduce the cooling power, and make the product more environmentally friendly.

[0032] Specifically, the first winding 200 is the primary side of a single-phase transformer, and the second winding 300 is the secondary side of the transformer. When the transformer starts operating, current flows into the first winding 200. At the same time, the excitation winding 400 connected in parallel with the first winding 200 also receives a starting voltage, generating an induced magnetic field. On the one hand, the second winding 300, which is wound on the same core column as the first winding 200, generates a first induced voltage; on the other hand, the voltage regulating winding 500, which is wound on the same core column as the excitation winding 400, receives a second induced voltage. The superposition of the first and second induced voltages is the final output voltage of the second winding 300. The output voltage can be adjusted by adjusting the effective number of turns connected to the voltage regulating winding 500.

[0033] For example, consider a tap changer with forward and reverse voltage regulation. If the transformer is a step-up transformer, forward voltage regulation can further increase the output voltage of the second winding 300. By adjusting the number of turns of the voltage regulating winding 400, other conditions remaining unchanged, the output voltage can be significantly increased or even doubled (the second induced voltage of the voltage regulating winding 400 is equal to the first induced voltage of the second winding 300). Based on this principle, a 500kV transformer can be upgraded to a 1000kV transformer. If the transformer is a step-down transformer, reverse voltage regulation can further reduce the output voltage of the second winding 300.

[0034] The above-mentioned single-phase transformer, on the one hand, adopts an iron core comprising a main column and at least two side columns, and the first winding 200 and the second winding 300, as well as the excitation winding 400 and the voltage regulating winding 500, are respectively wound on the main column and any side column, which is equivalent to reducing the number of lead wires and the number of coil turns on the same iron core column, which is not only conducive to improving the heat dissipation performance of the single-phase transformer, but also can avoid the limitation of the number of winding turns to a certain extent, increase the adjustable range of the transformer output voltage, and help expand the application scenarios of the single-phase transformer; on the other hand, a structure with side column excitation on the primary side and voltage regulation on the secondary side is adopted to adjust the output voltage, which has a simple structure, small size, good reliability and low manufacturing cost.

[0035] In one embodiment, the single-phase transformer is a step-up transformer. The first winding 200 is a low-voltage winding, and the second winding 300 is a high-voltage winding.

[0036] Among them, the single-phase transformer is a step-up transformer, which means that the low-voltage winding is used to connect to the power supply side, and the high-voltage winding is used to connect to the load, that is, the grid side. Figure 2 As shown, the excitation winding 400 is connected in parallel with the first winding 200. The starting end ja and the ending end jx of the excitation winding 400 are connected to the starting end a and the ending end x of the first winding 200, respectively. The starting end a and the ending end x of the first winding 200 are also connected to the generator. The lead end A of the second winding 300 is connected to the power grid. The starting end of the voltage regulating winding 500 is connected to the second winding 300, and the different connection terminals of the voltage regulating winding 500 are respectively connected to the various optional voltage regulating taps (i.e., Figure 2 The output terminal X of tap changer K is connected to the power grid. Specifically, by changing the connection method of tap changer K, the number of turns of the voltage regulating winding 500 can be changed. When tap 1 of tap changer K is connected to the voltage regulating winding 500, the voltage regulating winding 500 is completely disconnected from the circuit. When tap 5 of tap changer K is connected to the voltage regulating winding 500, the voltage regulating winding 500 is fully connected to the circuit.

[0037] In the above embodiment, the voltage regulating winding 500 is a high-voltage voltage regulating coil. According to the transformer principle, the current on the high-voltage side is much smaller than the current on the low-voltage side. A tap changer is connected to the high-voltage side. The tap changer has a small operating current and a correspondingly small volume, which is convenient for installation. Through the low-voltage excitation design, the number of turns of the excitation winding is small, which is conducive to reducing costs. Through the design of low-voltage excitation and high-voltage voltage regulation, the output voltage of the step-up transformer can be increased, which is conducive to reducing the number of boosting times during the power transmission process, reducing losses, reducing CO2 emissions, and saving land, which is of great significance to energy conservation and environmental protection.

[0038] In one embodiment, please refer to Figure 1 The core 100 is a single-phase, three-legged iron core structure, comprising a main leg, two side legs, and upper and lower yokes. The two side legs are located on either side of the main leg; the first winding 200 and the second winding 300 are wound around the main leg; the excitation winding 400 and the voltage regulating winding 500 are wound around either side leg.

[0039] Specifically, a main leg, two side legs, and upper and lower yokes form the transformer's magnetic circuit and mounting framework. The first and second windings 200 and 300 are wound on the main leg 110; the excitation winding 400 and voltage-regulating winding 500 are wound on either side leg 120, facilitating a more compact transformer structure. Furthermore, the core 100 can be constructed from high-quality, grain-oriented, cold-rolled silicon steel sheets, reducing electromagnetic losses and increasing magnetic induction efficiency, thereby enhancing the voltage regulation performance of the single-phase transformer.

[0040] In one embodiment, the low voltage winding is close to the main column 110 ; the high voltage winding is wrapped around the low voltage winding and along the outer periphery of the low voltage winding.

[0041] Specifically, if the first winding 200 is a low-voltage winding and the second winding 300 is a high-voltage winding, the first winding 200 is located close to the main column 110, and the second winding 300 is wrapped around the first winding 200 and along the outer periphery of the first winding 200. If the first winding 200 is a high-voltage winding and the second winding 300 is a low-voltage winding, the second winding 300 is located close to the main column 110, and the first winding 200 is wrapped around the second winding 300 and along the outer periphery of the second winding 300. Furthermore, to improve the insulation performance of the transformer, an insulating channel is provided between the first winding 200 and the second winding 300.

[0042] In the above embodiment, the low-voltage winding is positioned closer to the main column 110 than the high-voltage winding, and is located on the inner side. The high-voltage winding is positioned further away from the core, and is located on the outer side. This allows the low-voltage winding, which has a lower voltage and a higher current, to be positioned closer to the inner side of the main column 110, conforming to the design principle of arranging the windings in order of voltage from the inside out, resulting in a more rational layout.

[0043] In one embodiment, the excitation winding 400 is located near the side pole 120; the voltage regulating winding 500 is wrapped around the excitation winding 400 and along the outer periphery of the excitation winding 400. Furthermore, to improve the insulation performance of the transformer, an insulating channel is provided between the excitation winding 400 and the voltage regulating winding 500.

[0044] In the above embodiment, the voltage regulating winding 500 having multiple terminals is arranged outside the side pole 120, and the lead-out structure is simple, which is conducive to reducing the difficulty of manufacturing the transformer and improving the heat dissipation performance and short-circuit resistance.

[0045] In one embodiment, the low-voltage winding has a double-layer spiral winding structure. It is understood that if the first winding 200 is a low-voltage winding and the second winding 300 is a high-voltage winding, the first winding 200 has a double-layer spiral winding structure; if the first winding 200 is a high-voltage winding and the second winding 300 is a low-voltage winding, the second winding 300 has a double-layer spiral winding structure.

[0046] Among them, the single-layer spiral winding is provided with a head end lead at the upper end of the winding and a tail end lead at the bottom of the winding. Correspondingly, the double-layer spiral winding structure is actually composed of two single-layer spiral windings, the two layers of winding are connected at one end, and the other end of the winding is provided with a head end lead and a tail end lead. Specifically, the leakage magnetic field of the winding is determined by the direction of the current of the winding. The double-layer spiral winding structure can offset the end leakage magnetic field because the current directions of the head end and the tail end are opposite, thereby improving the problem of local overheating of metal structural parts such as the iron core caused by the leakage magnetic field generated by the high current of the low-voltage winding.

[0047] Furthermore, in one embodiment, the first winding 200 is a low-voltage winding, and both the first winding 200 and the excitation winding 400 have a double-layer spiral winding structure. Specifically, the excitation winding 400 is connected in parallel with the first winding 200, and both exhibit low-voltage and high-current characteristics. Designing the excitation winding 400 as a double-layer spiral winding structure, based on the same principle, can also offset the leakage magnetic field at the end of the excitation winding 400, thereby improving the problem of local overheating of metal components such as the core caused by leakage magnetic field generated by high current.

[0048] In one embodiment, the high voltage winding is a tangled winding structure.

[0049] Among them, the turns of the tangled winding are not arranged in a natural number sequence, but turns of non-adjacent number sequences are inserted between adjacent number sequence turns. In this way, the turns between the original continuous coil segments need to be interlaced and connected with the help of tangled transposition (rectification) to form tangled segments, thereby forming a tangled winding structure. Furthermore, the tangled winding structure can be an ordinary tangled winding structure or a flower-inserted tangled winding structure. In one embodiment, the high-voltage winding is a tangled continuous winding structure. The entanglement connects the tangled winding with the continuous winding to form a tangled continuous winding structure.

[0050] Specifically, the high-voltage winding has a middle outlet and adopts a tangled partition compensation structure, which can increase the longitudinal capacitance, improve the impact voltage distribution inside the high-voltage winding, reduce the impact voltage potential and gradient, improve the winding's short-circuit resistance, and help increase the insulation safety margin of the high-voltage winding.

[0051] In one embodiment, the voltage regulating winding 500 is a spiral winding structure, which is simple to wind and has low manufacturing cost.

[0052] In one embodiment, both the excitation winding 400 and the voltage regulating winding 500 use self-adhesive transposed conductors.

[0053] Among them, the transposed conductor is composed of a certain number of enameled copper flat wires combined into two rows with the wide sides touching each other, and the enameled wires in the two rows are transposed along the narrow sides in the same direction as required, and then the conductor is continuously and tightly wrapped with multiple layers of electrical insulating paper, rope or tape to form a conductor. Self-adhesive transposed conductors refer to transposed conductors with self-adhesive paint between the enameled flat wires, which can be bonded to each other after heating to form a whole. The self-adhesive transposed conductor can be a paper-insulated self-adhesive transposed conductor or a heat-shrinkable mesh-wrapped self-adhesive transposed conductor. Furthermore, in one embodiment, a large oil channel is also provided in the voltage regulating winding 500, which is beneficial to improving the heat dissipation performance of the winding.

[0054] In the above-described embodiment, self-adhesive transposed conductors are used to form the excitation winding 400 and the voltage regulating winding 500. On the one hand, the combination of multiple, split conductors and transposition significantly reduces eddy current and circulating current losses in the windings, while also reducing the temperature rise at hot spots in the windings, resulting in a more uniform temperature distribution throughout the windings. Compared to other windings with the same number of strands, transposed conductors have a higher fill factor and less outer insulation occupancy, which can reduce the size of the transformer. Furthermore, due to the transposed conductors' self-adhesive properties during heating, the windings are bonded together into a single unit, improving the transformer's short-circuit resistance.

[0055] In one embodiment, an oil guide baffle is arranged in the winding gap of the high-voltage winding.

[0056] Among them, the shape of the oil guide baffle can be "Z"-shaped, "S"-shaped or "Z"-shaped. Specifically, an oil guide baffle is arranged in the winding gap of the high-voltage winding, and an axial oil channel is placed, so that the oil flow can be evenly distributed to avoid splashing of cooling oil. Furthermore, the oil flow rate can be distributed according to the size of each winding loss, and the oil flow rate can be controlled below the preset speed, thereby eliminating the oil flow electrification phenomenon, ensuring that the winding has a good cooling effect, reducing the temperature rise of the winding hot spot, and avoiding local overheating. It can be understood that the value of the preset speed is not unique, for example, it can be 0.4m / s, 0.5m / s or 0.5m / s, which is determined in combination with the heat dissipation requirements of the winding.

[0057] For ease of understanding, the following Figure 1 and Figure 2 , the single-phase transformer in this application is described in detail.

[0058] In one embodiment, Figure 1 As shown, a single-phase transformer includes a single-phase three-leg iron core 100, a first winding 200 and a second winding 300 wound on the core's main leg 110, an excitation winding 400 and a voltage regulating winding 500 wound on either side leg 120 of the core, and a tap changer (not shown). The first winding 200 is the primary winding, the second winding 300 is the secondary winding, and the first winding 200 is the low-voltage winding, while the second winding 300 is the high-voltage winding. The excitation winding 400 is connected in parallel with the first winding 200; the tap changer connects the second winding 300 and the voltage regulating winding 500.

[0059] The iron core 100 is made of high-quality grain-oriented cold-rolled silicon steel sheets, which can reduce electromagnetic loss, improve magnetic induction efficiency, and thus improve the voltage regulation effect of the single-phase transformer. Figure 1 As shown, the low-voltage winding, or first winding 200, is located near the main leg 110. The high-voltage winding, or second winding 300, is wrapped around the low-voltage winding and wound around its outer periphery. An insulating channel is also provided between the low-voltage and high-voltage windings. This not only places the low-voltage winding, which has low voltage and high current, closer to the inside of the main leg 110, conforming to the design principle of arranging the windings in order of voltage from inside to outside, making the layout more rational, but also improving the transformer's insulation performance. The excitation winding 400 is located near the side leg 120. The voltage-regulating winding 500 is wrapped around the excitation winding 400 and wound around its outer periphery. The voltage-regulating winding 500, with its multiple terminals, is arranged outside the side leg 120, simplifying the wiring structure, reducing the transformer's manufacturing complexity, and improving heat dissipation and short-circuit resistance. Similarly, to enhance the transformer's insulation performance, an insulating channel is provided between the excitation winding 400 and the voltage-regulating winding 500.

[0060] Furthermore, both the low-voltage winding and the excitation winding 400 are double-layer spiral winding structures. Since the current directions at the head and tail ends are opposite, the leakage magnetic field at the ends can be offset, improving the leakage magnetic field caused by large currents, which causes local overheating of metal structural parts such as the iron core. The high-voltage winding is a tangled continuous winding structure, which can increase the longitudinal capacitance, improve the impact voltage distribution inside the high-voltage winding, reduce the impact voltage potential and gradient, and enhance the short-circuit resistance of the winding, which is beneficial to increasing the insulation safety margin of the high-voltage winding. The voltage regulating winding 500 is a spiral winding structure with simple winding and low manufacturing cost. Both the excitation winding 400 and the voltage regulating winding 500 use self-adhesive transposed conductors, which can greatly reduce the eddy current loss and circulating current loss of the winding, while reducing the temperature rise of the winding hot spots, making the temperature distribution of the entire winding more uniform, and also helping to improve the short-circuit resistance of the transformer winding.

[0061] In addition, the winding gaps of the high-voltage windings are arranged with "Z"-shaped oil guide baffles and axial oil channels, which can ensure uniform oil flow distribution and prevent cooling oil splashing. Furthermore, the oil flow rate can be distributed according to the size of each winding loss, and the oil flow rate can be controlled below a preset speed, thereby eliminating the phenomenon of oil flow electrification, ensuring good cooling effect on the winding, reducing the temperature rise of the winding hot spots, and avoiding local overheating. It is understood that the value of this preset speed is not unique, for example, it can be 0.4m / s, 0.5m / s, or 0.5m / s, and is determined in combination with the specific heat dissipation requirements of the winding.

[0062] Specifically, such as Figure 2 As shown in FIG, the tap changer K is a linear voltage regulating tap changer including five optional voltage regulating taps. Figure 2 As shown, the excitation winding 400 is connected in parallel with the first winding 200. The starting end ja and the ending end jx of the excitation winding 400 are connected to the starting end a and the ending end x of the first winding 200, respectively. The starting end a and the ending end x of the first winding 200 are also connected to the generator. The lead end A of the second winding 300 is connected to the power grid. The starting end of the voltage regulating winding 500 is connected to the second winding 300, and the different connection terminals of the voltage regulating winding 500 are respectively connected to the various optional voltage regulating taps (i.e., Figure 2 Tap changer K has taps "1" through "5" (see Figure 1). The output terminal X of tap changer K is connected to the grid. By changing the connection method of tap changer K, the number of turns of the voltage regulating winding 500 can be changed. When tap 1 of tap changer K is connected to the voltage regulating winding 500, the voltage regulating winding 500 is completely disconnected from the circuit. When tap 5 of tap changer K is connected to the voltage regulating winding 500, the voltage regulating winding 500 is fully connected to the circuit.

[0063] In the above embodiment, a three-column core is adopted, and the first winding 200 and the second winding 300 are wound on the main column 110, and the excitation winding 400 and the voltage regulating winding 500 are wound on the side column 120, which is equivalent to reducing the number of lead wires and the number of coil turns on the same core column, which is not only conducive to improving the heat dissipation performance of the single-phase transformer, but also can avoid the limitation of the number of winding turns to a certain extent, increase the adjustable range of the transformer output voltage, and help expand the application scenarios of the single-phase transformer; a structure with side column excitation on the primary side and voltage regulation on the secondary side is adopted to adjust the output voltage, which has a simple structure. , small size, good reliability, and low manufacturing cost; the voltage regulating winding 500 is a high-voltage voltage regulating coil. According to the transformer principle, the current on the high-voltage side is much smaller than the current on the low-voltage side. The tap changer is connected to the high-voltage side. The working current of the tap changer is small, and the corresponding volume is also small, which is easy to install; through the low-voltage excitation design, the number of coil turns of the excitation winding is small, which is conducive to reducing costs; through the design of low-voltage excitation and high-voltage voltage regulation, the output voltage of the step-up transformer can be increased, which is conducive to reducing the number of boosting times in the transmission process, reducing losses, reducing CO2 emissions, and saving land at the same time, which is of great significance to energy conservation and environmental protection.

[0064] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. The schematic descriptions of these terms throughout this specification do not necessarily refer to the same embodiment or example.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A single-phase transformer, characterized in that: include: An iron core comprising a main column and at least two side columns; a first winding and a second winding wound on the main column; The excitation winding and voltage regulating winding wound on any side column; and a tap changer; when the voltage regulating winding is not connected, one end of the tap changer is connected to the end of the second winding, and the other end is directly led out as a connection terminal; when the voltage regulating winding is connected, the output voltage is regulated by adjusting the effective number of turns connected to the voltage regulating winding; the tap changer is a forward and reverse voltage regulating tap changer; if the first winding is a low-voltage winding and the second winding is a high-voltage winding, the number of turns connected to the voltage regulating winding is adjusted by the forward and reverse voltage regulating tap changer to achieve forward voltage regulation to increase the output voltage of the second winding; if the first winding is a high-voltage winding and the second winding is a low-voltage winding, the number of turns connected to the voltage regulating winding is adjusted by the forward and reverse voltage regulating tap changer to achieve reverse voltage regulation to reduce the output voltage of the second winding; The first winding is a primary winding, the second winding is a secondary winding, the first winding is a low-voltage winding or a high-voltage winding, and the second winding is a high-voltage winding or a low-voltage winding; the excitation winding is connected in parallel with the first winding; The tap changer connects the second winding and the voltage regulating winding; wherein, when the first winding is a low-voltage winding, the first winding and the excitation winding are both double-layer spiral winding structures; the current flows in opposite directions at the head and tail ends of the double-layer spiral winding structure; The excitation winding and the voltage regulating winding both use self-adhesive transposed conductors; the self-adhesive transposed conductors refer to the transposed conductors having self-adhesive paint between the enameled flat wires, which adhere to each other after heating to form a whole; the voltage regulating winding is also provided with a large oil channel.

2. The single-phase transformer according to claim 1, characterized in that The iron core is a single-phase three-column iron core structure, including a main column, two side columns, an upper iron yoke and a lower iron yoke; the two side columns are respectively arranged on both sides of the main column.

3. The single-phase transformer according to claim 2, characterized in that The low voltage winding is close to the main column; the high voltage winding is sleeved on the low voltage winding and wound along the outer periphery of the low voltage winding.

4. The single-phase transformer according to claim 2, characterized in that The excitation winding is close to the side column; the voltage regulating winding is sleeved on the excitation winding and is wound along the outer periphery of the excitation winding.

5. The single-phase transformer according to claim 1, characterized in that The high-voltage winding is a tangled winding structure.

6. The single-phase transformer according to claim 1, characterized in that An oil guide baffle is arranged in the winding gap of the high-voltage winding.

7. The single-phase transformer according to claim 6, characterized in that The shape of the oil guide baffle is "Z"-shaped or "S"-shaped.

8. The single-phase transformer according to claim 1, characterized in that The tap changer is a linear voltage regulating tap changer.

9. The single-phase transformer according to claim 1, characterized in that The low-voltage winding is used to connect to the power supply side, and the high-voltage winding is used to connect to the load.

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