Hollow wire transformer

Abstract

The utility model discloses a hollow lead transformer, including high voltage insulator, low voltage insulator, shell, heat exchanger and circulating pump, it is equipped with a plurality of groups of high voltage insulator and low voltage insulator, and it is equipped with a plurality of groups of high voltage insulator and low voltage insulator transversely equidistant mode at the top of shell, heat exchanger is equipped on the front side and back side of shell, and circulating pump is equipped with the circulating pump. The circulating pump is mounted at the side bottom of the shell; an iron core, a confluence conduit and a plurality of groups of primary windings and secondary windings are arranged in the shell, the three secondary windings are respectively sleeved on a core column of the iron core, the three primary windings are respectively wound and sleeved on the secondary windings, the primary windings are led out to a high-voltage insulator through leads, and the secondary windings are led out to a low-voltage insulator through leads; the primary winding is formed by winding a hollow round wire, and the secondary winding is formed by winding a hollow flat wire. According to the device, the inherent heat dissipation problem is solved, and the problem of loss increase caused by the skin effect of current is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field, concretely is a kind of hollow conductor transformer. BACKGROUND

[0002] With the continuous development of power system, especially the large-scale access of renewable energy, higher requirements are put forward for transformer, including the increasing demand of miniaturization, light weight, high efficiency and the like. In order to improve heat dissipation, the common practice currently includes but is not limited to increasing distance and shell size to enhance the effect of natural air cooling, or installing a fan inside the transformer to achieve forced air cooling; to reduce current skin effect, winding wire usually adopts flat wire or multi-stranded transposed wire, however, these methods often lead to large equipment size, high cost, and may also introduce additional safety hazards.

[0003] The existing transformer has the following defects:

[0004] 1. The existing transformer usually adopts solid copper wire or aluminum wire as winding, which has good electrical performance, but faces the problem of poor heat dissipation in high power density applications;

[0005] 2. The existing transformer has the problem of increased loss due to current flowing mainly along the surface of the conductor under high frequency conditions, forming skin effect.

[0006] Therefore, a solution is needed. SUMMARY

[0007] (I) Technical problem solved

[0008] In view of the deficiencies of the prior art, the utility model provides a hollow conductor transformer to solve the problems raised in the background art.

[0009] (II) Technical scheme

[0010] To achieve the above object, the utility model discloses a hollow conductor transformer, including high -voltage insulator, low -voltage insulator, shell, heat exchanger and circulating pump, the high -voltage insulator and low -voltage insulator are all equipped with several groups, several groups high -voltage insulator and low -voltage insulator install in the top of shell in horizontal equidistance mode, heat exchanger installs in the front and rear two sides of shell, and circulating pump installs in the bottom of shell side face, the shell inside is equipped with iron core, the confluence guide pipe and several groups primary winding, secondary winding, three secondary winding are respectively covered on the core column of iron core, three primary windings are respectively wrapped in secondary winding, and the primary winding is led out to high -voltage insulator through lead, and the secondary winding is led out to low -voltage insulator through lead, the primary winding adopts the winding of hollow round conductor wire, and the secondary winding adopts the winding of hollow flat conductor wire, the inside bottom end of shell is filled with cooling insulating oil, the first end of hollow flat conductor wire is equipped with secondary oil inlet guide pipe, and the tail end is equipped with secondary oil outlet guide pipe, the first end of hollow round conductor wire is equipped with primary oil inlet guide pipe, and the tail end is equipped with primary oil outlet guide pipe, and the first end of hollow flat conductor wire and hollow round conductor wire is connected to the confluence guide pipe through secondary oil inlet guide pipe and primary oil inlet guide pipe respectively, and the tail end of hollow flat conductor wire and hollow round conductor wire is led out to the winding outside and cooling insulating oil respectively through secondary oil outlet guide pipe and primary oil outlet guide pipe.

[0011] Preferably, the circulating pump is provided with an oil inlet pipe at both ends, one end of the circulating pump is connected to the confluence guide pipe through the oil inlet pipe, and the other end of the circulating pump is connected to the inside of the shell through the oil inlet pipe.

[0012] Preferably, a valve is installed in each of the oil inlet pipes.

[0013] (Three) beneficial effects

[0014] The utility model provides a kind of hollow conductor transformer. It has the following beneficial effects:

[0015] The hollow conductor transformer in the present application benefits from the unique hollow structure and reasonable spacing, improving the overall heat dissipation performance of the transformer. Even under heavy load, it can maintain stable operation, reducing the risk of failure caused by overheating and prolonging the service life. By using hollow conductor winding design, the influence of skin effect on conductor resistance is greatly reduced, the eddy current loss is reduced, and the electrical conductivity is improved. Due to the use of a more flexible cooling system configuration, the best cooling strategy can be adjusted according to different application scenarios, enhancing the adaptability of the product. The transformer is miniaturized and lightened, reducing the floor area and transportation cost, which is conducive to popularization and application.

[0016] The hollow conductor transformer retains the advantages of the traditional transformer, overcomes the inherent heat dissipation problem to a certain extent, and solves the increase in resistance caused by the skin effect of the current, especially in the case of large current. Tests show that, under the same conditions, compared with the traditional solid conductor transformer, the hollow conductor transformer can reduce the working temperature rise by about 30% and the energy consumption by about 6% while maintaining the same load. This achievement has important significance for promoting modern power grid construction and promoting the development of new energy power generation technology. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a whole structure schematic view of the utility model;

[0018] Fig. 2 It is a structure schematic view of the shell inside.

[0019] In the figure, 1 is a high-voltage insulator, 2 is a low-voltage insulator, 3 is a shell, 4 is a heat exchanger, 5 is a circulating pump, 6 is an oil inlet pipe, 7 is a valve, 8 is an iron core, 9 is a secondary winding, 10 is a hollow flat conductor, 11 is a primary winding, 12 is a hollow round conductor, 13 is a bus duct, 14 is cooling insulating oil, 151 is a primary oil inlet guide pipe, 152 is a primary oil outlet guide pipe, 161 is a secondary oil inlet guide pipe, and 162 is a secondary oil outlet guide pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] Please refer to Figs. 1-2 The embodiment of the utility model provides a technical scheme:

[0022] Embodiment 1

[0023] For the above-mentioned problem 1 to be solved: the existing transformer usually adopts solid copper wire or aluminum wire as the winding. Although this design has good electrical performance, it faces the problem of poor heat dissipation in high power density applications.

[0024] The solution is as follows: a hollow conductor transformer, comprising high-voltage insulators 1, low-voltage insulators 2, a shell 3, a heat exchanger 4 and a circulating pump 5, the high-voltage insulators 1 and the low-voltage insulators 2 are each provided with a plurality of groups, the plurality of groups of the high-voltage insulators 1 and the low-voltage insulators 2 are installed in a transverse equidistant manner on the top of the shell 3, the heat exchanger 4 is installed on the front and rear sides of the shell 3, and the circulating pump 5 is installed on the side bottom of the shell 3; the inside of the shell 3 is provided with an iron core 8, a confluence conduit 13 and a plurality of groups of primary windings 11 and secondary windings 9, three secondary windings 9 are respectively sleeved on the core columns of the iron core 8, three primary windings 11 are respectively sleeved on the secondary windings 9, the primary windings 11 are led out to the high-voltage insulators 1 through lead wires, and the secondary windings 9 are led out to the low-voltage insulators 2 through lead wires; the primary windings 11 are made of hollow round conductors 12, and the secondary windings 9 are made of hollow flat conductors 10; the inside bottom end of the shell 3 is filled with cooling insulating oil 14; the first end of the hollow flat conductor 10 is provided with a secondary oil inlet guide pipe 161, and the tail end is provided with a secondary oil outlet guide pipe 162, the first end of the hollow round conductor 12 is provided with a primary oil inlet guide pipe 151, and the tail end is provided with a primary oil outlet guide pipe 152, the first ends of the hollow flat conductor 10 and the hollow round conductor 12 are connected to the confluence conduit 13 through the secondary oil inlet guide pipe 161 and the primary oil inlet guide pipe 151 respectively, and the tail ends of the hollow flat conductor 10 and the hollow round conductor 12 are respectively led out to the outside of the winding and communicated with the cooling insulating oil 14 through the secondary oil outlet guide pipe 162 and the primary oil outlet guide pipe 152, when the transformer works, the insulating cooling oil 14 in the shell enters from the oil inlet pipe 6 under the action of the circulating pump 5 and is respectively sent to the hollow conductors of the primary windings 11 and the secondary windings 9 through the confluence conduit 13, carries away the heat generated by the windings along the predetermined path and is discharged from the upper part of the hollow conductor through the oil outlet guide pipe, and the heated insulating cooling oil 14 releases heat to the external environment through the shell 3 and the heat exchanger 4 after being cooled, and then flows back to the lower part of the shell 3, thereby forming a closed cooling circulation system. Due to the use of high-efficiency heat-conducting material-hollow conductor, more heat can be transferred under the same conditions, thereby achieving better heat dissipation effect.

[0025] The circulating pump 5 is provided with oil inlet pipes 6 on the left and right ends, one end of the circulating pump 5 is connected with the confluence conduit 13 through the oil inlet pipe 6, and the other end of the circulating pump 5 is connected with the inside of the shell 3 through the oil inlet pipe 6, and the insulating cooling oil 14 in the shell enters from the oil inlet pipe 6 under the action of the circulating pump 5 and is respectively sent to the hollow conductors of the primary windings 11 and the secondary windings 9 through the confluence conduit 13.

[0026] A valve 7 is installed in each of the oil inlet pipes 6, and the oil inlet pipes 6 on the two sides of the circulating pump 5 are respectively provided with the valve 7, so as to prevent leakage when the circulating pump 5 is maintained and the filter element is replaced.

[0027] Example 2

[0028] The above-mentioned problem 2 to be solved: the existing transformer due to the current mainly flows along the surface of the conductor under high frequency conditions to form the skin effect, resulting in increased loss.

[0029] The solution is as follows: due to the adoption of hollow conductor as winding material, the tendency of current mainly flowing along the surface of the conductor under high frequency conditions is dispersed to the pipe wall, thereby significantly weakening the influence of the skin effect, avoiding excessive local current density of the conductor, significantly reducing the resistance and eddy current loss, improving the transmission efficiency and improving the material utilization.

[0030] Working principle: during operation, the insulating cooling oil 14 in the shell enters the hollow conductor of the primary winding 11 and the secondary winding 9 through the action of the circulating pump 5 from the oil inlet pipe 6 and is sent to the hollow conductor along the predetermined path, and the heat generated by the winding is taken away and discharged from the upper part of the hollow conductor through the oil outlet guide pipe, and the heated insulating cooling oil 14 is cooled by the shell 3 and the heat exchanger 4 to release heat to the external environment and then flows back to the lower part of the shell 3, forming a closed cooling circulation system. Due to the adoption of high-efficiency heat-conducting material-hollow conductor, more heat can be transferred under the same conditions, thereby achieving better heat dissipation effect. The hollow conductor is made of high-temperature-resistant and high-conductivity copper or aluminum alloy, and the wire gauge is selected according to the design requirements, and single or multiple hollow round conductors and hollow flat conductors are selected, and the wall thickness is controlled between 0.5-1mm, ensuring good mechanical strength and sufficient cooling liquid flow.

[0031] The utility model discloses a 1, high -voltage insulator;2, low -voltage insulator;3, shell;4, heat exchanger;5, circulating pump;6, oil inlet pipe;7, valve;8, iron core;9, secondary winding;10, hollow flat conductor;11, primary winding;12, hollow round conductor;13, converging duct;14, cooling insulating oil;151, primary oil -inlet guide pipe;152, primary oil -outlet guide pipe;161, secondary oil -inlet guide pipe;162, secondary oil -outlet guide pipe, the components are all general standard parts or the components known to those skilled in the art, and the structure and principle are all known to the technical personnel and can be known through the conventional experimental method, and the utility model solves the problem that the existing transformer usually adopts solid copper wire or aluminum wire as winding, and this design has good electrical performance, but in the application of high power density, the utility model discloses the mutual combination of the above -mentioned components can be applied to the winding design by the hollow conductor, retains the advantages of the traditional transformer, not only overcomes the inherent heat dissipation problem to a certain extent, but also solves the resistance increase caused by the skin effect of the current.

[0032] The basic principle and main features of the present application and the advantages of the present application are shown and described above, for those skilled in the art, obviously the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0033] In addition, it should be understood that, although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A hollow conductor transformer, characterized by: The utility model provides a kind of high-voltage transformer, including high-voltage insulator (1), low-voltage insulator (2), shell (3), heat exchanger (4) and circulating pump (5), the high-voltage insulator (1) and low-voltage insulator (2) are equipped with several groups, several groups high-voltage insulator (1) and low-voltage insulator (2) are installed in shell (3) top in transverse equidistant mode, heat exchanger (4) is installed in shell (3) front and back two sides, circulating pump (5) is installed in shell (3) side bottom; The shell (3) is internally provided with a core (8), a bus guide pipe (13), and a plurality of groups of primary windings (11) and secondary windings (9). Three secondary windings (9) are respectively sleeved on the core columns of the core (8). Three primary windings (11) are respectively sleeved on the secondary windings (9). The primary windings (11) are led out to the high-voltage insulators (1) through lead wires. The secondary windings (9) are led out to the low-voltage insulators (2) through lead wires. The primary windings (11) are made of hollow round wires (12). The secondary windings (9) are made of hollow flat wires (10). The bottom end of the shell (3) is filled with cooling insulating oil (14). The first end of the hollow flat wire (10) is provided with a secondary oil inlet guide pipe (161), and the tail end is provided with a secondary oil outlet guide pipe (162). The first end of the hollow round wire (12) is provided with a primary oil inlet guide pipe (151), and the tail end is provided with a primary oil outlet guide pipe (152). The first ends of the hollow flat wire (10) and the hollow round wire (12) are respectively connected to the bus guide pipe (13) through the secondary oil inlet guide pipe (161) and the primary oil inlet guide pipe (151). The tail ends of the hollow flat wire (10) and the hollow round wire (12) are respectively led out to the outside of the winding and connected to the cooling insulating oil (14) through the secondary oil outlet guide pipe (162) and the primary oil outlet guide pipe (152).

2. A hollow conductor transformer according to claim 1, characterized in that: The circulating pump (5) is provided with an oil inlet pipe (6) at both ends. One end of the circulating pump (5) is connected to the bus guide pipe (13) through the oil inlet pipe (6). The other end of the circulating pump (5) is connected to the inside of the shell (3) through the oil inlet pipe (6).

3. A hollow conductor transformer according to claim 1, characterized in that: A valve (7) is installed in each oil inlet pipe (6).

Images