Core and transformer

Abstract

The present disclosure provides an iron core and a transformer, and relates to the technical field of transformers. The iron core and the transformer provided by the present disclosure are provided with a plurality of support members on the circumference of the iron core column, a fixing member is wound around the iron core column and each support member, the iron core column is fixed, and an air gap is provided in the middle of the iron core column, thereby increasing the saturation of the iron core, so that after a direct current enters the iron core, the iron core will not be saturated, and effectively improving the problems of abnormal vibration of the iron core, increased loss, increased noise, etc. caused by magnetic flux saturation caused by the direct current entering the iron core.

Description

Technical Field

[0001] The present disclosure relates to the technical field of transformers, and in particular to an iron core and a transformer. Background Art

[0002] The rapid economic development has brought about an increase in electricity demand, while the imbalance in regional economic development has led to inconsistent demand. Coupled with the inconsistency between the regional distribution of power generation resources and the economic distribution, the demand for cross-regional power transmission is growing, which also brings more development opportunities to the DC transmission industry.

[0003] With the establishment of more and more DC lines, especially DC power stations, it has brought huge negative impact on the surrounding AC power stations. The most profound impact is that the DC current enters the transformer through the neutral point, causing the transformer magnetic circuit to saturate, resulting in increased vibration, increased noise, increased losses and other problems in the transformer. Summary of the invention

[0004] Based on the above research, the present disclosure provides an iron core and a transformer.

[0005] In a first aspect, the present disclosure provides an iron core, the iron core comprising at least one iron core column, a plurality of fixing members and a plurality of supporting members;

[0006] An air gap is provided in the middle of the core column;

[0007] Each of the support members is arranged on the circumferential side of the core column to support the core column, and each of the fixing members is arranged around the core column and each of the support members to fix the core column.

[0008] In an optional embodiment, the core column is formed by stacking a plurality of core sheets;

[0009] Each of the supporting members is arranged in a gap formed by stacking a plurality of the iron core sheets.

[0010] In an optional embodiment, the core further includes a first pull plate and a second pull plate;

[0011] The first pull plate and the second pull plate are respectively arranged on both sides of the stacked iron core sheets, and each of the fixing members is wound around the first pull plate and the second pull plate;

[0012] The first pull plate and the second pull plate are arranged along the stacking direction of the core sheets and are used for clamping the stacked core sheets.

[0013] In an optional embodiment, the core further includes a first support plate and a second support plate;

[0014] The first support plate and the second support plate are respectively arranged on two sides of the stacked core sheets, and each of the fixing members is wound around the first support plate and the second support plate;

[0015] The first support plate and the second support plate are arranged in a direction perpendicular to the stacking direction of the core sheets and are used to fix the core sheets.

[0016] In an optional implementation, the air gap is made of non-magnetic conductive material.

[0017] In an optional embodiment, the iron core further includes an upper iron yoke, a lower iron yoke, a first clamp and a second clamp;

[0018] The upper iron yoke of the iron core and the lower iron yoke of the iron core are respectively arranged at two ends of the iron core column and connected to the iron core column;

[0019] The first clamp is arranged on the upper yoke of the iron core, and the second clamp is arranged on the lower yoke of the iron core;

[0020] The first clamp and the second clamp are used to fix the core column, the upper core yoke and the lower core yoke.

[0021] In an optional embodiment, the first clamp includes a first high-pressure clamp, a first low-pressure clamp, a first side plate, and a second side plate;

[0022] The first high-pressure clamp and the first low-pressure clamp are arranged opposite to each other, and the first side plate and the second side plate are arranged opposite to each other between the first high-pressure clamp and the first low-pressure clamp;

[0023] The first high-voltage clamp, the first low-voltage clamp, the first side plate, and the second side plate form a first space, and the iron yoke on the iron core is disposed in the first space.

[0024] In an optional embodiment, the second clamp includes a second high-pressure clamp, a second low-pressure clamp, a third side plate and a fourth side plate;

[0025] The second high-pressure clamp and the second low-pressure clamp are arranged opposite to each other, and the third side plate and the fourth side plate are arranged opposite to each other between the second high-pressure clamp and the second low-pressure clamp;

[0026] The second high-voltage clamp, the second low-voltage clamp, the third side plate and the fourth side plate form a second space, and the core lower iron yoke is disposed in the second space.

[0027] In an optional embodiment, the core further comprises at least one upper beam and at least one foot;

[0028] Each of the upper beams is arranged on the first clamp, and each of the pads is arranged on the second clamp.

[0029] In a second aspect, the present disclosure provides a transformer, comprising a winding and the iron core described in any one of the aforementioned embodiments;

[0030] The winding is sleeved on the core column, and the number of the winding is the same as the number of the core column.

[0031] The iron core and transformer provided by the present invention increase the saturation of the iron core by arranging a plurality of support members on the circumferential side of the iron core column, winding a fixing member around the iron core column and each support member, fixing the iron core column, and arranging an air gap in the middle of the iron core column, thereby preventing the iron core from becoming saturated after a direct current enters the iron core, and effectively improving problems such as abnormal vibration of the iron core, increased loss, and increased noise caused by magnetic flux saturation caused by the direct current entering the iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of the iron core provided in the present invention.

[0034] Figure 2 Another structural schematic diagram of the iron core provided by the present invention.

[0035] Figure 3 This is another structural schematic diagram of the iron core provided by the present disclosure.

[0036] Figure 4 This is another structural schematic diagram of the iron core provided by the present disclosure.

[0037] Figure 5 A schematic diagram of the structure of a transformer provided by the present invention.

[0038] Icons: 100-iron core; 10-iron core column; 11-iron core sheet; 20-air gap; 30-fixing part; 40-supporting part; 50-first pull plate; 51-second pull plate; 52-first support plate; 53-second support plate; 60-iron core upper yoke; 70-iron core lower yoke; 80-first clamp; 801-first low-voltage clamp; 802-first high-voltage clamp; 803-first side plate; 81-second clamp; 811-second low-voltage clamp; 812-second high-voltage clamp; 813-third side plate; 814-fourth side plate; 82-upper beam; 83-foot pad; 200-winding; 201-low-voltage winding; 202-high-voltage winding; 203-voltage regulating winding. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions in the present disclosure will be clearly and completely described below in conjunction with the drawings in the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. The components of the present disclosure described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present disclosure, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0043] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present disclosure may be combined with each other.

[0045] The rapid economic development has led to an increase in electricity demand, while the imbalance of regional economic development has led to inconsistent demand. Coupled with the inconsistency between the regional distribution of power generation resources and economic distribution, the demand for cross-regional power transmission is increasing, which also brings more development opportunities to the DC transmission industry. With the establishment of more and more DC lines, especially DC power stations, it has brought huge negative impacts on the surrounding AC power stations. The most profound impact is that the DC current enters the transformer through the neutral point, causing the transformer magnetic circuit to saturate, resulting in increased vibration, increased noise, increased losses and local overheating of the transformer; and for the converter transformer of the DC power station, this kind of problem is even more serious.

[0046] Based on the above research, the present disclosure provides an iron core to improve the above problems.

[0047] Please refer to Figure 1 and Figure 2 The core 100 provided in the present disclosure includes at least one core column 10 , a plurality of fixing members 30 and a plurality of supporting members 40 .

[0048] An air gap 20 is disposed in the middle of the core column 10 .

[0049] Each of the support members 40 is disposed on the circumferential side of the core column 10 to support the core column 10 , and each of the fixing members 30 is disposed around the core column 10 and each of the support members 40 to fix the core column 10 .

[0050] The air gap 20 is made of non-magnetic material, such as epoxy board, glass fiber board, marble block, etc. The size of the air gap 20 is set according to the DC amount that the transformer needs to withstand. The larger the DC amount that needs to be borne, the larger the air gap 20.

[0051] As an optional embodiment, the air gap 20 can be set at any position of the core column 10. Because the core column 10 is provided with the air gap 20, the magnetic flux at the air gap 20 will be diffracted and scattered, and the no-load voltage ratio error will be slightly increased compared with the theoretical value. In order to reduce the voltage ratio error of the transformer, the present disclosure sets the air gap 20 at the middle position of the core column 10, and divides the core column 10 into an upper core column and a lower core column of equal height through the air gap 20.

[0052] Furthermore, in order to improve the stability of the core column 10 provided with the air gap 20, the present invention arranges each support member 40 on the peripheral side of the core column 10 to support the core column 10, and then each fixing member 30 is wrapped around the core column 10 and each support member 40 for binding and fixing to prevent the core column 10 from moving and causing problems such as increased vibration and increased noise.

[0053] As an optional implementation, the fixing member 30 provided in the present disclosure may be a binding strap.

[0054] The present invention sets a plurality of support members 40 on the circumferential side of the core column 10, winds each fixing member 30 around the core column 10 and each support member 40, fixes the core column 10, and sets an air gap 20 in the middle of the core column 10 to increase the saturation of the core 100, so that after the direct current enters the core 100, the core 100 will not be saturated, and effectively improves the problems of abnormal vibration, increased loss, increased noise and local overheating of the core 100 caused by magnetic flux saturation caused by the direct current entering the core 100. At the same time, the present invention increases the magnetic resistance of the core 100 by setting an air gap 20 in the middle of the core column 10, so that the excitation current of the transformer is greatly increased with almost no increase in no-load loss and noise.

[0055] In an optional embodiment, the core column 10 is formed by stacking a plurality of core sheets 11 .

[0056] Each of the supporting members 40 is disposed in a gap formed by stacking a plurality of the core sheets 11 .

[0057] The core column 10 is formed by stacking a plurality of core sheets 11 in layers. When stacking, the core sheets 11 in the middle are stacked based on the air gap 20, with the core sheets 11 in the middle being the largest level, and then gradually decreasing in level toward both sides.

[0058] like Figure 2 As shown, Figure 2 The cross-sectional view of the cross section of the core column 10 provided by the present invention, the core sheet 11 located at the center of the circle is the largest level, and from the center of the circle to the axial sides, each core sheet 11 decreases step by step, and the lateral width gradually decreases. Therefore, when each layer of core sheets 11 is stacked on the basis of the core sheets 11 of the previous layer, a gap is formed. In order to support the core column 10 and improve the stability of the core column 10, the present invention arranges each support member 40 in the gap formed when each core sheet 11 is stacked. Among them, the shape and size of each support member 40 are determined according to the shape and size of the gap formed when each core sheet 11 is stacked.

[0059] In order to further fix the core column 10 and improve the stability of the core column 10 , the core column 10 provided by the present disclosure further includes a first pull plate 50 , a second pull plate 51 , a first support plate 52 and a second support plate 53 .

[0060] The first pull plate 50 and the second pull plate 51 are respectively disposed on two sides of the stacked core sheets 11 , and each of the fixing members 30 is wound around the first pull plate 50 and the second pull plate 51 .

[0061] The first pull plate 50 and the second pull plate 51 are disposed along the stacking direction of the core sheets 11 and are used to clamp the stacked core sheets 11 .

[0062] The first support plate 52 and the second support plate 53 are respectively disposed on two sides of the stacked core sheets 11 , and each of the fixing members 30 is wound around the first support plate 52 and the second support plate 53 .

[0063] The first support plate 52 and the second support plate 53 are disposed in a direction perpendicular to the stacking direction of the core sheets 11 and are used to fix the core sheets 11 .

[0064] Among them, after the stacking of each iron core sheet 11 is completed, a first pull plate 50 and a second pull plate 51 are respectively set on both sides of the stacking direction of the iron core sheets 11 to clamp the stacked iron core sheets 11, and a first support plate 52 and a second support plate 53 are set on both sides in a direction perpendicular to the stacking direction of the iron core sheets 11 to fix each iron core sheet 11.

[0065] After the first pull plate 50, the second pull plate 51, the first support plate 52, the second support plate 53 and the supporting members 40 are set, the iron core column 10 is tied and fixed by each fixing member 30 wrapped around the first pull plate 50, the second pull plate 51, the first support plate 52, the second support plate 53 and the supporting members 40, thereby improving the stability of the iron core column 10.

[0066] Optionally, the first pull plate 50 and the second pull plate 51 provided in the present disclosure are insulating pull plates.

[0067] The iron core 100 provided by the present invention is configured by arranging a support member 40 in the gap formed when the iron core sheets 11 are stacked, and a first pull plate 50 and a second pull plate 51 are respectively arranged on both sides of the stacking direction of the iron core sheets 11, and a first support plate 52 and a second support plate 53 are arranged on both sides in a direction perpendicular to the stacking direction of the iron core sheets 11, and then a plurality of fixing members 30 are wrapped around and tied to fix them, thereby achieving reliable fixation of the iron core column 10 and improving the stability of the iron core column 10.

[0068] In an optional implementation, please refer to Figure 3 The iron core 100 provided in the present disclosure further includes an upper iron yoke 60 , a lower iron yoke 70 , a first clamp 80 and a second clamp 81 .

[0069] The core upper yoke 60 and the core lower yoke 70 are respectively disposed at two ends of the core column 10 and connected to the core column 10 .

[0070] The first clamp 80 is disposed on the core upper yoke 60 , and the second clamp 81 is disposed on the core lower yoke 70 .

[0071] The first clamp 80 and the second clamp 81 are used to fix the core column 10 , the upper core yoke 60 and the lower core yoke 70 .

[0072] The upper iron yoke 60 and the lower iron yoke 70 are respectively arranged at the two ends of the core column 10 and are fixedly connected to the core column 10. The first clamp 80 is arranged on the upper iron yoke 60 and the second clamp 81 is arranged on the lower iron yoke 70 to fix the upper iron yoke 60, the lower iron yoke 70 and the core column 10 to prevent the core 100 from moving as a whole.

[0073] In an optional implementation, please refer to Figure 3 and 4 The first clamp 80 includes a first high-pressure clamp 802, a first low-pressure clamp 801, a first side plate 803 and a second side plate (not shown in the figure).

[0074] The first high-voltage clamp 802 and the first low-voltage clamp 801 are disposed opposite to each other, and the first side plate 803 and the second side plate are disposed opposite to each other between the first high-voltage clamp 802 and the first low-voltage clamp 801 .

[0075] The first high-voltage clamp 802 , the first low-voltage clamp 801 , the first side plate 803 and the second side plate form a first space, and the core upper iron yoke 60 is disposed in the first space.

[0076] The second clamp 81 includes a second high-voltage clamp 812 , a second low-voltage clamp 811 , a third side plate 813 and a fourth side plate 814 .

[0077] The second high-voltage clamp 812 and the second low-voltage clamp 811 are disposed opposite to each other, and the third side plate 813 and the fourth side plate 814 are disposed opposite to each other between the second high-voltage clamp 812 and the second low-voltage clamp 811 .

[0078] The second high-voltage clamp 812 , the second low-voltage clamp 811 , the third side plate 813 , and the fourth side plate 814 form a second space, and the core lower iron yoke 70 is disposed in the second space.

[0079] Among them, the high-voltage clamp is a clamp facing the high-voltage side of the transformer, and the low-voltage clamp is a clamp facing the low-voltage side of the transformer. By setting the upper iron yoke 60 of the core in the first space formed by the first high-voltage clamp 802, the first low-voltage clamp 801, the first side plate 803 and the second side plate, the upper iron yoke 60 of the core and the part where the upper iron yoke 60 of the core is connected to the core column 10 are fixed. By setting the lower iron yoke 70 of the core in the second space formed by the second high-voltage clamp 812, the second low-voltage clamp 811, the third side plate 813 and the fourth side plate 814, the lower iron yoke 70 of the core and the part where the lower iron yoke 70 of the core is connected to the core column 10 are fixed, avoiding displacement of the upper iron yoke 60 of the core, the core column 10 and the lower iron yoke 70 of the core.

[0080] As an optional embodiment, the first side plate 803 and the second side plate can be disposed between the first high-pressure clamp 802 and the first low-pressure clamp 801 by means of bolts. The third side plate 813 and the fourth side plate 814 can be disposed between the second high-pressure clamp 812 and the second low-pressure clamp 811 by means of bolts.

[0081] In an optional implementation, please refer to Figure 1 , Figure 3 and Figure 4 The core 100 further includes at least one upper beam 82 and at least one foot 83 .

[0082] Each of the upper beams 82 is disposed on the first clamp 80 , and each of the footrests 83 is disposed on the second clamp 81 .

[0083] Among them, when there are multiple upper beams 82 and pads 83, each upper beam 82 is arranged at intervals on the first clamp 80, and each pad 83 is arranged at intervals on the second clamp 81. When there is only one upper beam 82 and pad 83, the upper beam 82 can be arranged in the middle of the first clamp 80, or at both ends of the first clamp 80, and the pad 83 can be arranged in the middle of the second clamp 81, or at both ends of the second clamp 81. The specific arrangement positions of the upper beam 82 and the pad 83 can be determined according to actual use conditions, and the present disclosure does not limit them.

[0084] As an optional embodiment, the upper beam 82 provided on the first clamp 80 can be opposite to the foot 83 provided on the second clamp 81. For example, an upper beam 82 is provided at a certain position of the first clamp 80, and a foot 83 is provided at a position of the second clamp 81 corresponding to the position.

[0085] As an optional embodiment, each upper beam 82 can be installed on the first clamp 80 by means of bolts, and each foot pad 83 can be installed on the second clamp 81 by means of bolts. Figure 3As shown, one end of each upper beam 82 can be set on the first high-voltage clamp 802 by bolts, the other end of each upper beam 82 can be set on the first low-voltage clamp 801 by bolts, one end of each foot 83 can be set on the second high-voltage clamp 812 by bolts, and the other end of each foot 83 can be set on the second low-voltage clamp 811 by bolts, and then the pressure control of the core 100 in the axial direction can be achieved by adjusting the bolts to prevent the core 100 from moving in the axial direction. By adjusting the axial pressure of each upper beam 82 and each foot 83 on the core 100, the increase in vibration and noise caused by the lead wire of the core column 10 being too tight or too loose is avoided.

[0086] The iron core 100 provided by the present invention avoids horizontal displacement of the iron core 100 by setting a first clamp 80 on the iron yoke 60 of the iron core and setting a second clamp 81 on the iron yoke 70 of the iron core. By setting an upper beam 82 on the first clamp 80 and a foot 83 on the second clamp 81, axial pressure control of the iron core 100 is achieved, thereby avoiding increased vibration and noise caused by over-tightening or over-loosening of the lead wires of the core column 10.

[0087] Based on the above, please refer to Figure 5 The present disclosure provides a transformer, which includes a winding 200 and an iron core 100 as described in any one of the above embodiments. Figure 5 The left side is an external view of the transformer provided by the present disclosure, Figure 5 The right side of is a cross-sectional view of the cross section of the transformer provided by the present disclosure.

[0088] The winding 200 is sleeved on the core column 10 , and the number of the winding 200 is the same as the number of the core column 10 .

[0089] The number of the core legs 10 is determined by the nature of the transformer itself. For example, for a three-phase transformer, the number of the core legs 10 is three, and for a single-phase transformer, the number of the core legs 10 is one or two. The winding 200 is sleeved on the core legs 10, so the number of the winding 200 is the same as the number of the core legs 10.

[0090] like Figure 5 As shown, the winding 200 provided by the present disclosure includes a low voltage winding 201, a high voltage winding 202 and a voltage regulating winding 203, wherein the low voltage winding 201 is located in the inner layer, the high voltage winding 202 is located in the middle layer, and the voltage regulating winding 203 is located in the outermost layer.

[0091] In the present disclosure, an air gap 20 is provided in the middle of each core column 10, and the winding 200 is sleeved on the core column 10. When the transformer is excited, under the constraint of the winding 200, the magnetic flux diffraction and dispersion at the air gap 20 are slight, and the negative effects such as increased damage to the inner coil (i.e., the low-voltage winding 201) and local overheating can be almost ignored.

[0092] In summary, the iron core and transformer provided by the present invention increase the saturation of the iron core by arranging multiple supporting parts on the circumferential side of the iron core column, winding the fixing parts around the iron core column and each supporting part, fixing the iron core column, and arranging an air gap in the middle of the iron core column, so that after the direct current enters the iron core, the iron core will not be saturated, effectively improving the problems of abnormal vibration of the iron core, increased loss, increased noise, etc. caused by magnetic flux saturation caused by the direct current entering the iron core.

[0093] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An iron core, characterized in that: The iron core comprises at least one iron core column, a plurality of fixing members and a plurality of supporting members; An air gap is provided in the middle of the core column, and the air gap divides the core column into an upper core column and a lower core column of equal height; the air gap does not completely separate the core column; Each of the supporting members is arranged on the circumference of the core column to support the core column, and each of the fixing members is wound around the core column and each of the supporting members to fix the core column; after being wound, the fixing members are round rather than square; The core column is formed by stacking a plurality of core sheets; Each of the supporting members is disposed in a gap formed by stacking a plurality of the iron core sheets; The inner side of each support member is attached to the side of a core sheet, and the other inner side is attached to another core sheet. The two core sheets attached to the support member are two connected core sheets, and the outer side of each support member is attached to the fixing member. The iron core further comprises an upper iron yoke, a lower iron yoke, a first clamp and a second clamp; The upper iron yoke of the iron core and the lower iron yoke of the iron core are respectively arranged at two ends of the iron core column and connected to the iron core column; The first clamp is arranged on the upper yoke of the iron core, and the second clamp is arranged on the lower yoke of the iron core; The first clamp and the second clamp are used to fix the core column, the upper iron yoke and the lower iron yoke; The first clamp comprises a first high-pressure clamp, a first low-pressure clamp, a first side plate and a second side plate; The first high-pressure clamp and the first low-pressure clamp are arranged opposite to each other, and the first side plate and the second side plate are arranged opposite to each other between the first high-pressure clamp and the first low-pressure clamp; The first high-voltage clamp, the first low-voltage clamp, the first side plate and the second side plate form a first space, and the iron yoke on the iron core is arranged in the first space; The iron core further includes at least one upper beam, one end of the upper beam is fixed to the first high-pressure clamp by bolts, and the other end of the upper beam is fixed to the first low-pressure clamp by bolts.

2. The core according to claim 1, characterized in that The iron core also includes a first pull plate and a second pull plate; The first pull plate and the second pull plate are respectively arranged on both sides of the stacked iron core sheets, and each of the fixing members is wound around the first pull plate and the second pull plate; The first pull plate and the second pull plate are arranged along the stacking direction of the core sheets and are used for clamping the stacked core sheets.

3. The core according to claim 1, characterized in that The core further includes a first support plate and a second support plate; The first support plate and the second support plate are respectively arranged on two sides of the stacked core sheets, and each of the fixing members is wound around the first support plate and the second support plate; The first support plate and the second support plate are arranged in a direction perpendicular to the stacking direction of the core sheets and are used to fix the core sheets.

4. The core according to claim 1, characterized in that The air gap is made of non-magnetic conductive material.

5. The core according to claim 1, characterized in that The second clamp includes a second high-pressure clamp, a second low-pressure clamp, a third side plate and a fourth side plate; The second high-pressure clamp and the second low-pressure clamp are arranged opposite to each other, and the third side plate and the fourth side plate are arranged opposite to each other between the second high-pressure clamp and the second low-pressure clamp; The second high-voltage clamp, the second low-voltage clamp, the third side plate and the fourth side plate form a second space, and the core lower iron yoke is disposed in the second space.

6. The core according to claim 1, characterized in that The core further comprises at least one foot; Each of the pads is disposed on the second clamp.

7. A transformer, characterized in that: The transformer comprises a winding and an iron core according to any one of claims 1 to 6; The winding is sleeved on the core column, and the number of the winding is the same as the number of the core column.

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