High-impedance transformer

Abstract

The utility model relates to the technical field of transformers, in particular to a high-impedance transformer, which comprises a coil assembly, a magnetic leakage sheet, a first coil, a second coil, a third coil and a fourth coil. Each magnetic leakage sheet comprises a plurality of silicon steel sheets, GPO3 plates are arranged on the sides, close to each other, of every two silicon steel sheets, epoxy plates are arranged on the upper surfaces and the lower surfaces of the silicon steel sheets in the same group, iron cores are installed on the upper portion and the lower portion of the coil group, and rear upper clamping pieces are fixedly installed on the upper portion and the lower portion of one side of each iron core. And three output wiring insulating plates are fixedly mounted on one side of the rear upper clamping piece. The method has the beneficial effects that when the ferromagnetic material is magnetized, one part of magnetic flux directly passes through the defect or bypasses the defect to enter the material again, and the other part of magnetic flux leaks into a space above the surface of the material and bypasses the defect through air to enter the material again, so that a leakage magnetic field is formed on the surface of the material, and the impedance of the whole transformer can be improved; harmonic waves of input current are eliminated, and pollution of the harmonic waves to a power grid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a high-impedance transformer. Background Art

[0002] A high impedance transformer is a specially designed transformer used to limit the short-circuit current of the power grid. Its short-circuit voltage percentage is higher than that of conventional transformers. The design of the high impedance transformer has a higher short-circuit impedance than that of conventional transformers, which means that under short-circuit conditions, it can effectively limit the amplitude of the current. This type of transformer is usually used in power grids where short-circuit current needs to be limited to reduce the impact and damage to the system. The high impedance transformer is an important component of the power system. It improves the reliability and safety of the system through special design. When selecting and using a high impedance transformer, it is necessary to determine the appropriate design and parameters based on the specific power grid conditions and application background.

[0003] In the prior art, current harmonics in traditional transformers are mainly generated by nonlinear loads. When current passes through nonlinear loads, non-sinusoidal current will be formed due to the non-linear relationship between current and voltage, i.e. harmonics will be generated, which will have a series of impacts on the power system and cause pollution to the power grid. Utility Model Content

[0004] The purpose of the utility model is to provide a high impedance transformer to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a high impedance transformer, comprising:

[0006] A coil group, wherein a mounting groove is provided in the coil group, and a magnetic leakage sheet is provided in the mounting groove;

[0007] Each of the magnetic leakage sheets comprises a plurality of silicon steel sheets, and a GPO3 plate is provided on one side of each of the silicon steel sheets close to each other, and epoxy plates are provided on the upper and lower surfaces of the silicon steel sheets in the same group.

[0008] Preferably, an iron core is installed at the upper and lower parts of the coil group, and a rear upper clamp is fixedly installed at the upper and lower parts of one side of the iron core.

[0009] Preferably, three output wiring insulation plates are fixedly mounted on one side of the rear upper clamp, and four connection joints are fixedly mounted in the middle of each output wiring insulation plate.

[0010] Preferably, a front upper clamp is fixedly mounted on the upper portion of the other side of the coil assembly.

[0011] Preferably, an input wiring insulation plate is fixedly mounted on the lower portion of the other side of the coil assembly.

[0012] Preferably, a plurality of evenly distributed input voltage regulating taps are fixedly installed in the middle of the input wiring insulation board.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The high impedance transformer proposed in the utility model is provided with a leakage magnetic sheet. Since the leakage magnetic sheet is provided with silicon steel sheets, GPO3 plates and epoxy plates, when the ferromagnetic material is magnetized, a part of the magnetic flux will directly pass through the defects or bypass the defects to re-enter the material, while the other part of the magnetic flux will leak into the space above the surface of the material, bypass the defects through the air and re-enter the material, thereby forming a leakage magnetic field on the surface of the material, which can improve the impedance of the whole transformer, eliminate the harmonics of the input current of the rectifier circuit, and reduce the pollution of the harmonic current to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the partial structure of the coil of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the magnetic leakage sheet of the utility model;

[0018] Figure 4 This is the electrical schematic diagram of the utility model.

[0019] In the figure: 1. Output wiring insulation plate; 2. Rear upper clamp; 3. Iron core; 4. Front upper clamp; 5. Coil group; 6. Input wiring insulation plate; 7. Connector; 8. Leakage magnetic sheet; 81. Silicon steel sheet; 82. GPO3 board; 83. Epoxy board; 9. Input voltage regulating tap; 10. Installation slot. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figures 1 to 4The utility model provides a technical solution: a high impedance transformer, comprising: a coil group 5, a mounting groove 10 is provided in the coil group 5, and a leakage magnetic sheet 8 is provided in the mounting groove 10; each leakage magnetic sheet 8 includes a plurality of silicon steel sheets 81, and a GPO3 board 82 is provided on one side of each silicon steel sheet 81 close to each other, and an epoxy board 83 is provided on the upper and lower surfaces of the silicon steel sheets 81 in the same group. The GPO3 board 82 is a hard plate-shaped insulating material made of an alkali-free glass fiber felt board impregnated with an unsaturated polyester resin paste, and has good mechanical strength and electrical insulation performance. It is used as a safety baffle or shield to prevent the local overheating caused by the leakage magnetic field from affecting other components. The silicon steel sheet 81 has a high magnetic conductivity and can effectively reduce the loss and temperature rise caused by the leakage magnetic field. The epoxy board 83 is an insulating material made of epoxy resin, which has good mechanical properties, heat resistance and insulation performance. The epoxy board 83 is used to isolate different The potential part, or as a supporting structure to maintain the stability and insulation of the component, at this time, after the ferromagnetic material is magnetized, the surface or near-surface defects will generate a leakage magnetic field. When the ferromagnetic material is magnetized, if the material is continuous and uniform, the magnetic induction lines will be constrained inside the material. However, if there are defects that cut the magnetic lines of force, such as cracks or other changes in the tissue state, the magnetic permeability of the material will change. Since the magnetic permeability of the defective part is usually low and the magnetic resistance is large, this will cause the magnetic flux in the magnetic circuit to be distorted. Therefore, part of the magnetic flux will directly pass through the defect or bypass the defect to re-enter the material, while another part of the magnetic flux will leak into the space above the surface of the material, bypass the defect through the air and enter the material again, thereby forming a leakage magnetic field on the surface of the material. By adding the leakage magnetic sheet 8, the impedance of the whole transformer can be improved, the harmonics of the input current of the rectifier circuit can be eliminated, and the pollution of the harmonic current to the power grid can be reduced.

[0022] An iron core 3 is installed at the upper and lower parts of the coil group 5, and a rear upper clamp 2 is fixedly installed at the upper and lower parts of one side of the iron core 3. Three output wiring insulation plates 1 are fixedly installed on one side of the rear upper clamp 2, and four connecting joints 7 are fixedly installed in the middle of each output wiring insulation plate 1. A front upper clamp 4 is fixedly installed at the upper part of the other side of the coil group 5, and an input wiring insulation plate 6 is fixedly installed at the lower part of the other side of the coil group 5. A plurality of evenly distributed input voltage regulating taps 9 are fixedly installed in the middle of the input wiring insulation plate 6. The four connecting joints 7 are connected to the outer winding of the coil group 5 in sequence, and the voltage of the outer winding coil is 3Φ740V. The primary line voltage of the inner winding of the coil group 5 is R1-S1-T1 connected to 3Φ361V, R2-S2-T2 connected to 3Φ380V, and R3-S3-T3 connected to 3Φ399V. At the same time, the input voltage regulating tap 9 is used to adjust the output voltage of the transformer to adapt to grid voltage fluctuations or load changes.

[0023] When the ferromagnetic material is magnetized, the magnetic permeability of the material will change due to the mutual cooperation between the silicon steel sheet 81, the epoxy board 83 and the GPO3 board 82. Since the magnetic permeability of the defective part is usually low and the magnetic resistance is large, a part of the magnetic flux will directly pass through the defect or bypass the defect to re-enter the material, while the other part of the magnetic flux will leak into the space above the surface of the material, bypass the defect through the air and re-enter the material, thereby forming a leakage magnetic field on the surface of the material. By adding a leakage magnetic sheet 8, and the leakage magnetic sheet 8 is also wrapped with a 0.13 nanometer three-layer paper, the impedance of the entire transformer can be increased, the harmonics of the input current of the rectifier circuit can be eliminated, and the pollution of the harmonic current to the power grid can be reduced.

[0024] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A high impedance transformer, characterized in that: include: A coil assembly (5), wherein a mounting groove (10) is provided in the coil assembly (5), and a magnetic leakage sheet (8) is provided in the mounting groove (10); Each magnetic leakage sheet (8) comprises a plurality of silicon steel sheets (81), and each pair of silicon steel sheets (81) is provided with a GPO3 plate (82) on one side close to each other, and the silicon steel sheets (81) in the same group are provided with epoxy plates (83) on the upper and lower surfaces.

2. A high impedance transformer according to claim 1, characterized in that: The upper and lower parts of the coil group (5) are both equipped with an iron core (3), and the upper and lower parts of one side of the iron core (3) are both fixedly equipped with a rear upper clamp (2).

3. A high impedance transformer according to claim 2, characterized in that: Three output wiring insulation plates (1) are fixedly mounted on one side of the rear upper clamp (2), and four connection joints (7) are fixedly mounted in the middle of each output wiring insulation plate (1).

4. A high impedance transformer according to claim 1, characterized in that: A front upper clamp (4) is fixedly mounted on the upper portion of the other side of the coil group (5).

5. A high impedance transformer according to claim 1, characterized in that: An input wiring insulation plate (6) is fixedly mounted on the lower portion of the other side of the coil group (5).

6. A high impedance transformer according to claim 5, characterized in that: A plurality of evenly distributed input voltage regulating taps (9) are fixedly installed in the middle of the input wiring insulation board (6).

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