Filter transformer for suppressing harmonic eddy-current loss noise

Abstract

The invention discloses a filter transformer for suppressing harmonic eddy current loss noise, which is characterized in that a core-wrapped column is mounted between an upper yoke and a lower yoke, each of the upper yoke and the lower yoke comprises a plurality of silicon steel sheets, the plurality of silicon steel sheets of the upper yoke are transversely and vertically stacked and arranged front and back, each silicon steel sheet of the upper yoke is divided into two sheets, and the two sheets are arranged in parallel; the upper end of the upper iron yoke and the lower end of the lower iron yoke are provided with an upper pressing beam and a lower pressing beam respectively, and the steel silicon steel sheet further comprises a tensioning piece. The upper end and the lower end of the tensioning piece are installed on the upper pressing beam and the lower pressing beam in a penetrating mode respectively so that the upper end face and the lower end face of the iron core column can be tightly attached to the end face of the upper iron yoke and the end face of the lower iron yoke respectively, and the problems of mechanical noise caused by inter-sheet high-frequency electrodynamic force attraction caused by higher harmonics, eddy current heating caused by large faces of silicon steel sheets and the like are solved. The invention has the technical characteristics of low temperature rise, low noise, low loss, economy, safety, reliability and the like.

Description

Technical Field

[0001] The invention relates to a transformer, and more specifically, to a filter transformer capable of suppressing harmonic eddy current loss noise, and belongs to the technical field of transformers. Background Art

[0002] The three-phase transformer is a combination of three single-phase transformers of the same capacity, with three independent windings, which are connected to the three-phase AC power supply through different connection methods (such as star and triangle), and the output is also the same. It mainly works based on the principle of electromagnetic induction: when AC current flows through the primary coil, AC magnetic flux is generated in the iron core or magnetic core, and this alternating magnetic flux passes through the secondary winding, inducing voltage or current in the secondary winding. If the secondary winding is connected to the load of the external circuit, AC current will flow out to achieve the output of electric energy. The three-phase transformer is mainly composed of iron core, winding, oil tank, oil pillow, insulating bushing, tap changer and gas relay. Among them: Iron core: It is the magnetic circuit part of the transformer, which is made of high-quality silicon steel sheets with a thickness of 0.3-0.35mm or thinner to reduce hysteresis and eddy current losses. The iron core includes an iron core column, a winding on the iron core column, and the upper and lower iron yokes connect the iron core columns to form a closed magnetic circuit. Winding: It is the circuit part of the transformer, which is divided into high-voltage winding and low-voltage winding. There are two types of windings: concentric and overlapping. The concentric winding is to make both the high-voltage winding and the low-voltage winding into a cylindrical shape, and then coaxially sleeved on the iron core column; the overlapping winding is to divide the high-voltage winding and the low-voltage winding into several coils, which are staggered along the height of the iron core column.

[0003] At present, the advantages of three-phase transformers are that they can realize voltage conversion and current transmission; they have high efficiency and stability; they can be carefully designed and manufactured according to user requirements; after establishing a new neutral line-grounding, they can eliminate the common mode interference and other neutral line problems in the power grid; they can convert three-wire △ wiring into a four-wire Y0 system, further eliminating high-frequency pulse interference and noise coupled by the transformer. It is suitable for circuits with AC 50Hz to 60Hz and voltage below 660V. It is widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, lighting and other fields.

[0004] However, the three-phase transformer in the prior art has the following technical defects: 1) After the upper iron yoke, the lower iron yoke and the iron core column in the transformer are assembled into a table, the iron yoke and the iron core column are pressed by the upper and lower pressure beams through the pull rods, and the structure is loose, and each phase of the iron core column is made separately, so it is difficult to make the three iron core columns completely equal in height. When assembled into a table, the three iron core columns are lined up on the smooth upper surface of the lower iron yoke, and the three iron core columns are placed on the lower iron yoke, and then the upper iron yoke is installed, and the upper and lower iron yokes and the iron core columns are pressed by the pull rods. Since the upper iron yoke and the lower iron yoke have stable structures and are not easy to deform, the three core columns cannot be completely equal in height (the basic principle that three points cannot be in a straight line). Even if the processing accuracy of the three iron core columns is very high, it is very easy to cause the three iron core columns to be unable to be installed at the same height during actual installation. Therefore, it will eventually happen that the pressing force of the three iron core columns is inconsistent when the transformer is assembled into a table, and the iron core is very likely to vibrate due to electromagnetics, causing huge noise.

[0005] 2) It is impossible to accurately position the core column at the fixed position of the corresponding upper and lower iron yokes, and the stability of the entire core cannot be ensured. Mechanical noise is easily caused by assembly errors, and the product structure is poor, loose, and difficult to operate;

[0006] 3) If Fig.12 The figure shows the laminated iron core column in the magnetic induction area of ​​a traditional transformer. In order to overcome the inability of the electric attraction force to generate vibration and mechanical noise here, the iron core curing glue is used to brush the curing glue on the entire iron core column, and then a glass ribbon or a fiberglass belt is tied to the cured iron core column. This structure can barely be used on the fundamental wave of AC power. When encountering high-order spectrum waves, the radial magnetic derivative magnetic lines of the leakage magnetic field pass through the large surface of the silicon steel sheet to cause eddy current heating (at the cross-section), the core temperature rises sharply, and the iron core curing glue loses the function of curing the whole. The glass ribbon and the fiberglass belt play a limiting role without clamping force, so it is impossible to control the attraction force and electric force between the silicon steel sheets in the iron core column. Under high-order harmonics, its attraction frequency increases sharply, and the mechanical noise caused by the attraction of high-frequency electric force between the sheets of the iron core column becomes larger and larger, until the iron core column is completely loose, until the conductor and the conductor are short-circuited and the transformer is burned. Summary of the invention

[0007] In order to solve the above-mentioned problems of the prior art, the present invention provides a filter transformer for suppressing harmonic eddy current loss noise, which has the technical characteristics of low temperature rise, low noise, low loss, economy, safety and reliability.

[0008] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0009] The present invention discloses a filter transformer for suppressing harmonic eddy current loss noise, comprising a coil, an insulation, a body, an oil tank and three iron core columns arranged at equal intervals, wherein the iron core column is installed between an upper iron yoke and a lower iron yoke, wherein the upper iron yoke and the lower iron yoke both comprise a plurality of silicon steel sheets, and the silicon steel sheets are fitted and pressed into a block by fasteners, wherein the plurality of silicon steel sheets of the upper iron yoke are arranged horizontally and vertically and stacked front to back, wherein the silicon steel sheets of the upper iron yoke are divided into two sheets, and the dividing lines on adjacent silicon steel sheets are staggered to achieve cross-staggered clamping and clamping between the stacked silicon steel sheets, wherein an upper pressure beam and a lower pressure beam are respectively installed at the upper end of the upper iron yoke and the lower end of the lower iron yoke, and further comprising a tensioning member, wherein the upper and lower ends of the tensioning member are respectively penetrated and installed on the upper pressure beam and the lower pressure beam to achieve the upper and lower end faces of the iron core column being respectively fitted against the end faces of the upper iron yoke and the lower iron yoke.

[0010] Preferably, the dividing lines on adjacent silicon steel sheets are respectively located on the left and right sides of the center lines of the two silicon steel sheets, and the two dividing lines are spaced 10 mm apart.

[0011] Preferably, three equally spaced mounting grooves are respectively provided on the lower end surface of the upper iron yoke and the upper end surface of the lower iron yoke, and the middle mounting groove is located at the center line of the upper iron yoke. The mounting grooves are formed by cutting silicon steel sheets, wherein the width of the mounting grooves (silicon steel sheet cutting openings) located at the center is greater than the spacing between adjacent dividing lines, and the mounting grooves on the upper iron yoke and the mounting grooves on the lower iron yoke are arranged one by one in the upper and lower directions, and boss tenons are embedded in the mounting grooves, and each of the core columns is restricted and positioned by corresponding boss tenons in the upper and lower directions.

[0012] Preferably, the boss tenon is formed by stacking a plurality of silicon steel sheets, and the boss tenon protrudes from the end surfaces of the upper iron yoke and the lower iron yoke.

[0013] Preferably, the size of the boss tenon is matched with the size of the mounting groove.

[0014] Preferably, process holes are opened at the upper and lower ends of the core column, the size of the process holes is matched with the size of the boss tenon, and the boss tenons on the upper iron yoke and the lower iron yoke can be inserted into the process holes to restrict and position the core column.

[0015] Preferably, the fasteners include four channel steels and a plurality of bolts, wherein two channel steels are used to be clamped front and back on the silicon steel sheet on the upper iron yoke and are fixed by passing bolts and nuts, and the other two channel steels are used to be clamped front and back on the silicon steel sheet on the lower iron yoke and are fixed by passing bolts and nuts.

[0016] Preferably, the tensioning member comprises a pull rod, and the upper and lower ends of the pull rod are respectively passed through channel steels located at the upper and lower ends and are locked and fixed by nuts.

[0017] Preferably, there are two upper pressure beams and two lower pressure beams, the two upper pressure beams are longitudinally spaced apart and arranged on the upper end surface of the upper iron yoke, and the two lower pressure beams are longitudinally spaced apart and arranged on the lower end surface of the lower iron yoke; the two upper pressure beams are respectively located in the middle of adjacent iron core columns, the upper pressure beams and the lower pressure beams are arranged in one-to-one correspondence, and the front end of the upper pressure beam and the front end of the lower pressure beam and the rear end of the upper pressure beam and the rear end of the lower pressure beam are respectively locked and fixed by tensioning pieces.

[0018] Preferably, a plurality of silicon steel laminations are stacked around the core column, and the plurality of silicon steel laminations form a circular column structure, so that the lamination direction of the core column is parallel to the derivation direction of the magnetic excitation line, thereby achieving lateral electromotive force without high-order harmonic alternating current between the silicon steel laminations of the core column.

[0019] Beneficial effects: low temperature rise, low noise, low loss, economical, safe and reliable; by cutting the silicon steel sheet on the iron yoke with a 10mm cross-staggered center line in the length direction, and then stacking them into a whole iron yoke, the eddy current loss of a single silicon steel sheet can be reduced by 1%. Even if three core columns of unequal height are placed on the broken yoke, the upper iron yoke is installed, and the pull rod is tightened, the upper iron yoke can also be slightly deformed due to the height difference of the three columns. Through this slight deformation, the iron cores of the three columns of unequal height are tightly fitted with the upper and lower iron yokes, so that the three columns are protected. The forces are equal, which ensures the tightness of the entire core structure and solves the technical problem that the three points cannot be in a straight line, thereby reducing the vibration of the core caused by electromagnetic radiation; using the process hole in the middle of the radiating core column, three boss tenons corresponding to the process holes of the core column are stacked with silicon steel sheets at the corresponding positions of the upper and lower iron yokes. When assembling the core column, as long as the process holes of the core column are aligned with the boss tenons, the spacing between the three columns and the iron yoke are accurately assembled. The structure of the entire product is stable, strict and easy to operate; the lamination direction of the entire core column is consistent with the direction of the magnetic excitation line (such as Fig.10 The core columns are parallel to the direction of the arrow in the middle, so that there is no high-order harmonic AC lateral attraction electric force between the core columns, which solves the mechanical noise caused by the high-frequency electric force attraction between the plates caused by high-order harmonics. Compared with the existing technical basis, the technology of the present invention has a stable and solid overall structure, and the process makes its operation simple and the installation precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the transformer of the present invention.

[0021] Figure 2 It is a top view of the overall structure of the transformer of the present invention.

[0022] Figure 3 It is a schematic diagram of the connection between the iron core column and the iron yoke of the present invention.

[0023] Figure 4 It is a side view of the connection between the iron core column and the iron yoke of the present invention.

[0024] Figure 5 It is a top view of the lower iron yoke of the present invention.

[0025] Figure 6 It is an enlarged view of point A of the present invention.

[0026] Figure 7 It is a schematic diagram of the arrangement of some silicon steel sheets at the installation groove of the present invention.

[0027] Figure 8 It is a top view of the connection between the lower iron yoke and the iron core column of the present invention.

[0028] Fig. 9 It is a front view of the connection between the lower iron yoke and the iron core column of the present invention.

[0029] Fig.10 It is a schematic diagram of the connection between the lower iron yoke and the boss tenon of the present invention.

[0030] Fig.11 It is a diagram showing the lamination method of the core columns of the present invention and the direction of the magnetic lines of force of the magnetically derived leakage magnetic field.

[0031] Fig.12 It is a diagram showing the direction of magnetic lines of force of the core column lamination method and the magnetic leakage field in the prior art. DETAILED DESCRIPTION

[0032] The following is in conjunction with the instruction manual Figure 1-12 , the present invention is further illustrated, but the present invention is not limited to the following embodiments.

[0033] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “horizontal”, “longitudinal”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] The main feature of the filter transformer designed in this application is that it can operate safely and reliably in a high-order harmonic environment. Especially under the influence of high-order harmonics brought by today's marine wind power, solar power generation, hydrogen energy and supporting energy storage, the transformer can maintain low temperature rise, low loss, low noise, long-term economic, safe and reliable operation.

[0035] like Figure 1-11The figure shows a specific embodiment of a filter transformer for suppressing harmonic eddy current loss noise, a filter transformer for suppressing harmonic eddy current loss noise, comprising a coil, an insulation, a body, an oil tank and three equally spaced iron core columns 8, the iron core column 8 is installed between an upper iron yoke 1 and a lower iron yoke 2, the upper iron yoke 1 and the lower iron yoke 2 both comprise a plurality of silicon steel sheets 3 and the silicon steel sheets 3 are pressed together into a block by fasteners, the plurality of silicon steel sheets 3 of the upper iron yoke 1 are all horizontally vertical and the front and rear areas are The silicon steel sheets 3 of the upper iron yoke 1 are divided into two pieces, and the dividing lines 4 on adjacent silicon steel sheets 3 are staggered to achieve cross-staggered clamping and clamping between the stacked silicon steel sheets 3. An upper pressure beam 5 and a lower pressure beam 6 are respectively installed at the upper end of the upper iron yoke 1 and the lower end of the lower iron yoke 2, and also include a tensioning member 7. The upper and lower ends of the tensioning member 7 are respectively penetrated and installed on the upper pressure beam 5 and the lower pressure beam 6 to achieve the upper and lower end faces of the core column 8 being respectively attached to the end faces of the upper iron yoke 1 and the lower iron yoke 2.

[0036] The prior art (such as "Transformer Radiant Core Column") has disclosed that the core column is composed of an upper and lower iron yoke and an iron core column, respectively. After being assembled into a table, the iron yoke and the iron core column are pressed tightly by the upper and lower pressure beams through the pull rod. Therefore, its structure is loose, and each phase of the iron core column is made separately, so it is difficult to achieve that the three core columns are completely equal in height. When assembled into a table, although the three core columns are lined up on the smooth surface of the lower iron yoke, the upper and lower iron yokes are stable and not easy to deform, so the three core columns cannot be completely equal in height (the design focus of this application: the positions where the three core columns contact the upper iron yoke are regarded as three points. Since the upper iron yoke has high hardness and is not easy to deform, when pulling the three core columns, it is impossible to achieve the same force and consistent fit between the three core columns and the upper iron yoke and the three core columns and the lower iron yoke. Principle: the basic principle that three points cannot be in a straight line). Even if the processing accuracy of the three core columns is very high, it is very easy to have the problem that the three core columns cannot be installed at the same height during actual installation. Therefore, it is inevitable that the transformer will eventually be assembled into a station because the pressing force of the three core columns is inconsistent, and the core is very likely to vibrate due to electromagnetics, causing huge noise. The above problem cannot be solved at present, and can only be checked or replaced regularly.

[0037] In view of the above technical problems, the present invention solves the technical problem of "three points cannot form a straight line" in the transformer. The creativity lies in: the silicon steel sheets 3 of the upper iron yoke 2 which are vertical and stacked front to back are cut at the center line in the length direction and cross-staggered with a spacing of 10 mm, and then cross-staggered and stacked to form a whole upper iron yoke 2 (Note: the silicon steel sheets 3 are cut longitudinally along the length direction to achieve a 1% reduction in the eddy current loss of a single silicon steel sheet 3), thus solving the technical problem of "three points cannot form a straight line" in the transformer.

[0038] The silicon steel sheet creatively designed in this application is called a broken yoke (this design point has significant substance and is a freely defined name).

[0039] Operation method / principle: For example, three core columns 8 of different heights are placed on the lower iron yoke 2, and then the upper iron yoke 1 is installed, and the tie rod 13 (i.e., the tie member 7) is tightened at the same time. Since the silicon steel sheets 3 on the upper iron yoke 1 are vertical and stacked front to back, they are cross-staggered stacks. Therefore, even if the upper iron yoke 1 is pressed into a block, the silicon steel sheets 3 on the upper iron yoke 1 have certain deformation in the vertical direction. Tie rods 13 are set between the left core column 8 and the middle core column 8, and between the middle core column 8 and the right core column 8. At the same time, the tie rods 13 on the left and right are tightened. During the tightening process, the silicon steel sheets 3 on the upper iron yoke 1 in the middle can be deformed downward, so that the upper ends of the core columns 8 on the right, middle, and left sides are subjected to uniform force and have consistent fit. Therefore, it is precisely because the upper iron yoke 1 will form a slight deformation due to the height difference of the three columns that this slight deformation allows the three core columns 8 of unequal height to fit tightly with the upper and lower iron yokes, so that the three core columns 8 are subjected to equal forces, ensuring the tightness of the entire core structure, solving the technical problem that the three points cannot be in a straight line, thereby reducing the vibration of the core caused by electromagnetics. This design point seems simple, but it actually breaks the technical understanding of traditional iron yokes by those skilled in the art. It takes into account the required hardness and stability, and also achieves slight deformation (the overall structure is clamped by misalignment and external fasteners, so it is only slightly deformed, and the technical solution of this application only needs slight deformation). The present invention provides a broader space for the development and use scenarios of transformers.

[0040] In a preferred embodiment, the dividing lines 4 on adjacent silicon steel sheets 3 are respectively located on the left and right sides of the center lines of the two silicon steel sheets 3, and the two dividing lines 4 are spaced 10 mm apart. The cutting spacing is a preferred size and can be adjusted according to actual needs. This application does not impose any specific restrictions.

[0041] In a preferred embodiment, three equally spaced mounting grooves 9 are respectively provided on the lower end surface of the upper iron yoke 1 and the upper end surface of the lower iron yoke 2, and the middle mounting groove 9 is located at the center line of the upper iron yoke 1. Figure 7As shown, the present application preferably adopts a non-through installation groove 9 (that is, the depth dimension of the installation groove is not as large as the width dimension of the silicon steel sheet), and the installation groove is formed by cutting the silicon steel sheet 3, wherein the width of the cutting opening of the installation groove 9 located at the center is greater than the spacing between the adjacent dividing lines 4 (to achieve that the cutting opening forming the installation groove 9 covers the dividing lines 4 on part of the silicon steel sheet 3). Since the installation groove 9 is also formed by cutting a number of silicon steel sheets 3, the dividing lines 4 located at the top of some silicon steel sheets 3 will be covered by the cutting opening forming the installation groove 9, while the dividing lines 4 on the silicon steel sheet 3 located at the bottom of the installation groove 9 are still arranged in an interlaced manner. The design scheme of the present application has a compact structural design, a high degree of integration, and a novel design scheme, and can accurately achieve the technical effect. Specifically: the installation groove 9 on the upper iron yoke 1 and the installation groove 9 on the lower iron yoke 2 are arranged one by one, and a boss tenon 10 is embedded in the installation groove 9, and each of the core columns 8 is restricted and positioned by the boss tenon 10 corresponding to the upper and lower boss tenons.

[0042] In a preferred embodiment, the boss tenon 10 is formed by stacking a number of silicon steel sheets 3, and the boss tenon 10 protrudes from the end faces of the upper iron yoke 1 and the lower iron yoke 2. The size of the boss tenon 10 is compatible with the size of the mounting slot 9. Process holes are provided at the upper and lower ends of the core column 8, and the size of the process hole is compatible with the size of the boss tenon 10. The boss tenons 10 on the upper iron yoke 1 and the lower iron yoke 2 can be inserted into the process holes to limit the positioning of the core column 8. The above design allows the boss tenons 10 to fit tightly with the boss tenons 10, facilitating precise assembly and ensuring that the core column 8 does not shift. When assembling the core column 8, it is sufficient to align the process hole of the core column 8 with the boss tenon 10, ensuring the spacing between the three columns and the precise assembly of the iron yoke. The entire product structure is stable, strict and easy to operate.

[0043] In a preferred embodiment, the fasteners include four channel steels 12 and a plurality of bolts, wherein two channel steels 12 are used to be clamped on the silicon steel sheet 3 on the upper iron yoke 1 and fixed by bolts and nuts, and the other two channel steels 12 are used to be clamped on the silicon steel sheet 3 on the lower iron yoke 2 and fixed by bolts and nuts. The tension member 7 includes a pull rod 13, and the upper and lower ends of the pull rod 13 are respectively passed through the channel steels 12 located at the upper and lower ends and fixed by nuts. The upper pressure beam 5 and the lower pressure beam 6 are each provided with two, and the two upper pressure beams 5 are longitudinally spaced and arranged on the upper end surface of the upper iron yoke 1, and the two lower pressure beams 6 are longitudinally spaced and arranged on the lower end surface of the lower iron yoke 2; the two upper pressure beams 5 are respectively located in the middle of the adjacent iron core columns 8, and the upper pressure beams 5 and the lower pressure beams 6 are arranged one by one, and the front end of the upper pressure beam 5 and the front end of the lower pressure beam 6 and the rear end of the upper pressure beam 5 and the rear end of the lower pressure beam 6 are respectively locked and fixed by the tension member 7. The structure is simple, the installation is convenient, the practicability is strong, and it is suitable for the assembly operation based on the current technology.

[0044] In a preferred embodiment, a plurality of silicon steel laminations 14 are stacked around the core column 8, and the plurality of silicon steel laminations 14 form a circular column structure, so that the lamination direction of the core column 8 is parallel to the derivation direction of the magnetic excitation line, thereby achieving lateral electromotive force without high-order harmonic alternating current between the silicon steel laminations 14 of the core column 8.

[0045] like Fig.12 The figure shows the laminated core column of the traditional transformer magnetic induction area. In order to overcome the problem that the electric suction force cannot generate vibration and mechanical noise here, the core curing glue is used to cure the entire core column ( Fig.12 The silicon steel sheets are gradually getting longer from the left and right ends to the middle. The silicon steel sheets are brushed with curing glue as a whole, and then glass ribbons are tied to the cured iron core columns, or glass fiber reinforced plastic strips are used. This structure can barely be used on the fundamental wave of AC power. When encountering high-order spectrum waves, the radial magnetic derivative magnetic lines of the leakage magnetic field (arrow direction) pass through the large surface of the silicon steel sheet to cause eddy current heating (at the cross-section surface), and the temperature of the iron core rises sharply. The curing glue of the iron core will lose the function of curing the whole, and the glass ribbon and glass fiber reinforced plastic strip play a limiting role without clamping force, so it is impossible to control the electromotive force between the silicon steel sheets in the iron core column. Under high-order harmonics, its attraction frequency increases sharply, and the mechanical noise caused by the attraction of high-frequency electromotive force between the sheets of the iron core column will become larger and larger, until the iron core column is completely loose, until the conductor and the conductor are short-circuited and the transformer is burned.

[0046] However, in this application, the lamination direction of the core column in the magnetic induction area of ​​the transformer is parallel to the direction of the magnetic field lines of the magnetic derivative of the leakage magnetic field (such as Fig.11 As shown), the magnetic derivative magnetic lines of force of the core column in the magnetic induction zone can only enter and exit from the thickness direction of the silicon steel sheet 3 (generally about 0.3 mm), and the eddy current ring of the magnetic lines of force is limited within the thickness of the silicon steel sheet 3, completely eliminating the opportunity for the magnetic lines of force derived from the radial leakage magnetic field of the magnetic induction zone to pass through the large surface of the silicon steel sheet 3, so that no hot spots are generated in the radiating core column of the magnetic induction zone, so that the transformer is not affected by high-order harmonics, ensuring that the filter transformer designed in this application can operate in a high-order harmonic environment with low temperature rise, low loss, environmental protection, economy, reliability and safety.

[0047] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A filter transformer for suppressing harmonic eddy current loss noise, comprising a coil, an insulation, a body, an oil tank and three iron core columns (8) arranged at equal intervals, wherein the iron core column (8) is installed between an upper iron yoke (1) and a lower iron yoke (2), wherein the upper iron yoke (1) and the lower iron yoke (2) both comprise a plurality of silicon steel sheets (3) and the silicon steel sheets (3) are pressed together into a block by fasteners, characterized in that: The plurality of silicon steel sheets (3) of the upper iron yoke (1) are arranged in a horizontal and vertical manner and stacked front to back. The silicon steel sheets (3) of the upper iron yoke (1) are divided into two sheets, and the dividing lines (4) on adjacent silicon steel sheets (3) are staggered to achieve cross-staggered clamping and clamping between the stacked silicon steel sheets (3). An upper pressure beam (5) and a lower pressure beam (6) are respectively installed at the upper end of the upper iron yoke (1) and the lower end of the lower iron yoke (2), and also include a tensioning member (7). The upper and lower ends of the tensioning member (7) are respectively penetrated and installed on the upper pressure beam (5) and the lower pressure beam (6) to achieve the upper and lower end faces of the core column (8) being respectively pressed against the end faces of the upper iron yoke (1) and the lower iron yoke (2).

2. A filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: The dividing lines (4) on adjacent silicon steel sheets (3) are respectively located on the left and right sides of the center lines of the two silicon steel sheets (3), and the two dividing lines (4) are spaced 10 mm apart.

3. A filter transformer for suppressing harmonic eddy current loss noise according to claim 1 or 2, characterized in that: Three equally spaced mounting grooves (9) are respectively provided on the lower end surface of the upper iron yoke (1) and the upper end surface of the lower iron yoke (2), wherein the middle mounting groove (9) is located at the center line of the upper iron yoke (1), wherein the width of the mounting groove (9) located at the center is greater than the spacing between adjacent dividing lines (4), the mounting grooves (9) on the upper iron yoke (1) and the mounting grooves (9) on the lower iron yoke (2) are arranged one by one in upper and lower correspondence, a boss tenon (10) is embedded in the mounting groove (9), and each of the core columns (8) is restricted and positioned by the boss tenons (10) corresponding to the upper and lower boss tenons.

4. A filter transformer for suppressing harmonic eddy current loss noise according to claim 3, characterized in that: The boss tenon (10) is formed by stacking a plurality of silicon steel sheets (3).

5. A filter transformer for suppressing harmonic eddy current loss noise according to claim 3 or 4, characterized in that: The size of the boss tenon (10) is compatible with the size of the installation groove (9).

6. The filter transformer for suppressing harmonic eddy current loss noise according to claim 3, characterized in that: The upper and lower ends of the core column (8) are provided with process holes, the size of the process holes is compatible with the size of the boss tenon (10), and the boss tenon (10) on the upper iron yoke (1) and the lower iron yoke (2) can be inserted into the process holes to restrict and position the core column (8).

7. The filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: The fasteners include four channel steels (12) and a plurality of bolts, wherein two channel steels (12) are used to be clamped front and back on the silicon steel sheets (3) on the upper iron yoke (1) and are locked and fixed by passing bolts and nuts, and the other two channel steels (12) are used to be clamped front and back on the silicon steel sheets (3) on the lower iron yoke (2) and are locked and fixed by passing bolts and nuts.

8. The filter transformer for suppressing harmonic eddy current loss noise according to claim 7, characterized in that: The tensioning member (7) comprises a pull rod (13), the upper and lower ends of which pass through channel steels (12) located at the upper and lower ends respectively and are locked and fixed by nuts.

9. A filter transformer for suppressing harmonic eddy current loss noise according to claim 8, characterized in that: The upper pressure beam (5) and the lower pressure beam (6) are each provided with two, the two upper pressure beams (5) are longitudinally spaced apart and arranged on the upper end surface of the upper iron yoke (1), and the two lower pressure beams (6) are longitudinally spaced apart and arranged on the lower end surface of the lower iron yoke (2); the two upper pressure beams (5) are respectively located in the middle of adjacent iron core columns (8), the upper pressure beams (5) and the lower pressure beams (6) are arranged in one-to-one correspondence, and the front end of the upper pressure beam (5) and the front end of the lower pressure beam (6) as well as the rear end of the upper pressure beam (5) and the rear end of the lower pressure beam (6) are respectively locked and fixed by tensioning members (7).

10. The filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: A plurality of silicon steel laminations (14) are stacked around the core column (8), and the plurality of silicon steel laminations (14) form a circular column structure, so that the lamination direction of the core column (8) is parallel to the direction of magnetic excitation line derivation, thereby achieving a horizontal electromotive force without high-order harmonic alternating current between the silicon steel laminations (14) of the core column (8).

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