CN111029109A

CN111029109A - Transformer with external sudden short circuit impact resistance function

Info

Publication number: CN111029109A
Application number: CN202010005332.4A
Authority: CN
Inventors: 张军海
Original assignee: GUANGZHOU YIBIAN POWER SOURCE EQUIPMENT CO LTD
Current assignee: GUANGZHOU YIBIAN POWER SOURCE EQUIPMENT CO LTD
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-04-17

Abstract

The invention provides a transformer with an external burst short circuit impact resistance function, which comprises a transformer main body and a clamping piece, wherein the transformer main body comprises a coil and an iron core, and the clamping piece is fixedly connected with the iron core; the iron core comprises a core column and an iron yoke, and the core column is fixedly connected with the iron yoke; the coil is coaxially wound on the core column and comprises a bending part and a straight part connected with the bending part; the clamping pieces comprise an upper clamping piece and a lower clamping piece, the upper end and the lower end of the transformer main body are respectively provided with two upper clamping pieces/lower clamping pieces, two ends of the two upper clamping pieces/lower clamping pieces are respectively connected through an upper cross beam and a lower cross beam, a longitudinal beam perpendicular to the upper cross beam and the lower cross beam is arranged between the upper cross beam and the lower cross beam, and an insulating plate is arranged between the longitudinal beam and a linear part of the coil. According to the invention, the insulating plate is additionally arranged between the linear part of the coil and the longitudinal beam, so that the linear part of the coil is prevented from being greatly deformed, and the operation safety of the transformer is ensured.

Description

Transformer with external sudden short circuit impact resistance function

Technical Field

The invention relates to the technical field of transformers, in particular to a transformer with an external sudden short circuit impact resistance function.

Background

At present, in order to create a safe, reliable and strong power grid, the quality requirements of a power transmission and distribution transformer operating in the power grid are gradually improved in China. The transformer is an electrical device that changes an ac voltage by using the principle of electromagnetic induction, and may be damaged by a short circuit during operation. When the short circuit happens outside the transformer, the low-voltage coil is stressed to contract radially inwards, and the high-voltage coil expands and deforms radially outwards. Because the low-voltage coil is wound on the core column, the low-voltage coil is less deformed during sudden short circuit, and no structure is arranged on the outer surface of the high-voltage coil for auxiliary shaping.

The straight line part of the long circular section coil commonly used in the market at present has weaker mechanical strength. In the case of a sudden short circuit outside the transformer, the deformation generated in the straight portion is large. If the coil is deformed more over a longer period of time, the insulating layer of the coil is easily damaged and broken. When the transformer works, turn-to-turn or interlayer short circuit of the coil is easily caused, and the coil of the transformer is burnt. The traditional method for manufacturing the short-circuit resistant product generally improves the manufacturing cost of the transformer through a large number of redundant functional designs. Therefore, how to improve the short circuit impact resistance of the transformer and reduce the manufacturing cost is an urgent problem to be solved by the transformer manufacturing industry.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a transformer with an external sudden short circuit impact resistance function.

The purpose of the invention is realized by adopting the following technical scheme:

a transformer with an external burst short circuit impact resistance function comprises a transformer main body and a clamping piece, wherein the transformer main body comprises a plurality of coils and an iron core, and the clamping piece is fixedly connected with the iron core; the iron core comprises a core column and an iron yoke, and the core column is fixedly connected with the iron yoke; the coil is coaxially wound on the core column and comprises a bending part and a straight part connected with the bending part;

the clamping pieces comprise an upper clamping piece and a lower clamping piece, the upper end/the lower end of the transformer main body is respectively provided with two upper clamping pieces/lower clamping pieces, two ends of the two upper clamping pieces/lower clamping pieces are respectively connected through an upper cross beam/a lower cross beam, a longitudinal beam perpendicular to the upper cross beam/the lower cross beam is arranged between the upper cross beam and the lower cross beam, and an insulating plate is arranged between the longitudinal beam and a linear part of the coil; the clamping pieces form a rectangular hollow frame, and the transformer main body is arranged in the rectangular hollow frame.

Furthermore, an insulating plate is arranged between every two adjacent coils and used for tightly supporting the linear portions of the coils, and the coils are in interference fit with the insulating plate.

Further, the insulating plate is fixed to the longitudinal beam through bolts.

Further, the insulation board is made of electrical laminated wood.

Furthermore, the coil comprises a high-voltage coil and a low-voltage coil, the low-voltage coil is sleeved on the periphery of the core column, and the high-voltage coil is sleeved outside the low-voltage coil; and a supporting plate is arranged between the low-voltage coil and the core column and used for tightly supporting the low-voltage coil.

Further, the length of the insulating plate is not less than the height of the coil.

Further, the transformer also comprises an oil tank, and the transformer main body and the clamping pieces are both positioned inside the oil tank.

Furthermore, a cooling pipeline is arranged inside the clamping piece, a liquid inlet pipe and a liquid outlet pipe are respectively arranged at two ends of the clamping piece, the liquid inlet pipe is connected with a cooling liquid source, the liquid outlet pipe is connected with a liquid discharging port, and cooling liquid enters the cooling pipeline through the liquid inlet pipe and is discharged through the liquid outlet pipe.

Further, the core column comprises a plurality of first iron core pieces arranged in a stacked mode, the iron yoke comprises a plurality of second iron core pieces arranged in a stacked mode, the cross sections of the first iron core pieces and the second iron core pieces are in a step shape, two ends of each first iron core piece are reduced towards the end portion direction, a groove is formed in the connecting position of each second iron core piece and the corresponding first iron core piece, the groove is sunken along the reducing direction of the corresponding first iron core piece, and the reducing end of the corresponding first iron core piece is overlapped with the groove of the corresponding second iron core piece.

Furthermore, a circulating pump is further arranged and arranged on the outer side of the liquid inlet pipe, and the driving cooling water is filled in the water cooling pipeline inside the clamping piece.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a transformer with an external sudden short circuit impact resistance function. When the short circuit happens to the outside of the transformer, the insulating plate tightly supports the straight line part of the coil, so that the coil cannot expand outwards excessively, the insulating layer of the coil is prevented from being damaged, and the short circuit impact resistance of the transformer is improved. And the structure of the insulation board additionally arranged outside the transformer main body has low cost, and the problem of high cost of manufacturing the short-circuit-resistant transformer in the traditional method is solved.

Drawings

Fig. 1 is a front view of a transformer according to an embodiment of the present invention;

FIG. 2 is a side view of a transformer according to an embodiment of the present invention;

FIG. 3 is a schematic view of plane A-A of FIG. 1;

FIG. 4 is a three-dimensional view of a clip according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an iron core according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a core post according to an embodiment of the present invention;

in the figure: 10. a coil; 11. a low-voltage coil; 12. a high-voltage coil; 20. a clamp; 21. a cross beam; 22. a stringer; 23. an insulating plate; 24. a bolt; 25. a liquid inlet pipe; 26. a liquid outlet pipe; 27. a fixing through hole; 30. a stem; 31. a first iron core sheet; 32. a supporting plate; 40. an iron yoke; 50. and an oil tank.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "" second "are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 6, the present invention provides a transformer with an external burst short circuit impact resistance, which includes a transformer body and a clip 20, wherein the transformer body includes a plurality of coils 10 and an iron core, and the clip 20 is fixedly connected to the iron core; the iron core comprises a core column 30 and an iron yoke 40, and the core column 30 is fixedly connected with the iron yoke 40; the coil 10 is coaxially wound around the core column 30, and includes a curved portion and a linear portion connected to the curved portion;

the clamping pieces 20 comprise an upper clamping piece and a lower clamping piece, the upper end and the lower end of the transformer main body are respectively provided with two upper clamping pieces/lower clamping pieces, two ends of the two upper clamping pieces/lower clamping pieces are respectively connected through an upper cross beam 21 and a lower cross beam 21, a longitudinal beam 22 perpendicular to the upper cross beam 21 and the lower cross beam 21 is arranged between the upper cross beam 21 and the lower cross beam 21, and an insulating plate 23 is arranged between the longitudinal beam 22 and the linear part of the coil 10; the clip 20 constitutes a rectangular hollow frame in which the transformer body is disposed.

The invention provides a transformer with an external burst short circuit impact resistance function, wherein longitudinal beams 22 are respectively arranged at the left end and the right end of a clamping piece 20, an insulating plate 23 is arranged between the longitudinal beams 22 and a straight line part of a coil 10, and the insulating plate 23 is in interference fit with the coil 10. When the external of the transformer is suddenly short-circuited, the insulating plate 23 tightly supports the straight part of the coil 10, so that the coil 10 cannot excessively expand outwards, the insulating layer of the coil 10 is prevented from being damaged, and the short-circuit impact resistance of the transformer is improved. And the insulating plate 23 is additionally arranged outside the transformer main body, so that the structure cost is low, and the problem of high cost in the traditional method for manufacturing the short-circuit-resistant transformer is solved.

Specifically, as shown in fig. 1, the transformer body includes A, B, C three-phase coil 10 and an iron core, the coil 10 is coaxially sleeved on the core column 30 to form a curved portion and a linear portion, both ends of the linear portion are respectively connected to the curved portion, and turns of the coil 10 are sequentially arranged in layers along the axial direction of the core column 30 and are continuously wound in a spiral shape. The outer surfaces of the straight portions of the adjacent coils 10 are attached to each other. The upper end and the lower end of the transformer main body are respectively provided with two clamping pieces 20, each clamping piece 20 comprises an upper clamping piece and a lower clamping piece, the upper clamping piece is arranged at the top end of the transformer main body, and the lower clamping piece is arranged at the bottom of the transformer main body. The iron core is fixed on the upper clamping piece and the lower clamping piece through the fixing through hole 27. The upper and lower clip members are hollow rectangular in cross section, which provides the clip member 20 with improved mechanical strength. The clip 20 is provided with a plurality of fixing through holes 27 at the bottom or top for fixing the iron core. When the fixing through holes 27 of the clamping piece 20 clamp the iron core, the clamping effect of the iron core is better, and the noise generated by the vibration of the iron core is reduced.

Two ends of the two upper clamping pieces or the two lower clamping pieces are respectively provided with an upper beam 21 or a lower beam 21, and the two upper clamping pieces or the two lower clamping pieces are fixedly connected through the beams 21. A longitudinal beam 22 perpendicular to the upper/lower cross beam 21 is further arranged between the upper cross beam 21 and the lower cross beam 21. The clamping pieces 20, the cross beams 21 and the longitudinal beams 22 form a rectangular hollow frame, and the transformer main body is located inside the rectangular hollow frame and used for fixing, supporting and protecting the transformer main body. An insulating plate 23 is additionally arranged between the longitudinal beam 22 and the linear part of the coil 10 and is used for pressing the linear part of the coil 10. In the process that the coil 10 expands and deforms radially outwards due to sudden short circuit outside the transformer, the insulating plate 23 compresses the straight line part of the coil 10, so that the coil 10 can only expand in a gap between the insulating plate 23 and the coil 10, the insulating plate 23 is high in bearing capacity and can receive large impact force, the coil 10 cannot deform excessively, the insulating layer on the outer surface of the coil 10 is protected, and the insulating layer is prevented from causing the coil 10 to deform and break. Side beams are provided on both sides of the transformer body, and the coil 10 is movable only within the rectangular hollow frame.

The position of the coil 10 is fixed by the core column 30, and the coil 10 is forced to expand outwards in case of a sudden short circuit outside the transformer. Insulating plates 23 are provided between adjacent coils 10 to tighten the linear portions of the coils 10. And the coil 10 is in interference fit with the insulating plate 23, and is pressed by the insulating plate 23 in the expansion process, so that the shape of the coil 10 is kept in a controllable range. The orthogonal projection of the insulating plate 23 coincides with the orthogonal projection of the linear portion of the coil 10, that is, the insulating plate 23 can completely cover the linear portion of the coil 10, and the coil 10 can only expand in situ without being pressed by the adjacent coil 10. The insulating layer of the coil 10 can be prevented from being damaged and broken, and meanwhile, the coil 10 can only deform slightly at the preset position, so that the adjacent coil 10 cannot be affected, and the internal fault of the transformer is caused.

The material of the insulating plate 23 needs to satisfy insulation, can bear certain impact force, does not need to be frequently replaced, therefore adopts the electrical laminated wood of high strength and high density in this embodiment, and mechanical strength and electrical property satisfy the demand of transformer, and difficult fracture, by the puncture in the use satisfies the operating requirement of transformer. The insulating plates 23 on both sides of the transformer body are fixed to the side members 22 by bolts 24. And because the insulating plate 23 and the coil 10 adopt interference fit, the insulating plate 23 positioned in the middle gap of the coil 10 can be directly and vertically placed. When a short circuit occurs outside the transformer, the A, B, C three-phase coil 10 will expand outward, so both sides of the insulating plate 23 will be impacted by a certain force and will not move easily.

In addition, the coil 10 includes a low voltage coil 11 and a high voltage coil 12, the low voltage coil 11 is sleeved on the periphery of the stem 30, and the high voltage coil 12 is sleeved on the periphery of the low voltage coil 11. In case of sudden short circuit outside the transformer, the high voltage coil 12 is forced to expand outwards and is pressed by the insulating plate 23, and the low voltage coil 11 is forced to contract radially inwards. Since the low voltage coil 11 is wound around the core column 30, the deformation is small, but a certain deformation still occurs, thereby affecting the shape of the high voltage coil 12 sleeved outside. Therefore, the stay 32 is provided in the gap between the stem 30 and the low-voltage coil 11. The stay plate 32 has a shape conforming to the original shape of the low voltage coil 11 and is fitted to the low voltage coil 11. When short circuit happens outside the transformer, the low-voltage coil 11 contracts inwards, and the bracing plate 32 supports the low-voltage coil 11 to keep the low-voltage coil 11 to maintain the original shape.

Preferably, the transformer body and the clamping pieces 20 are located inside the oil tank 50, and the oil tank 50 is filled with transformer oil, so that the iron core and the coil 10 are immersed in the transformer oil, the transformer oil plays a role in insulation and heat dissipation, heat generated during the operation of the transformer is evacuated, and the normal operation of the transformer is prevented from being influenced by overheating.

As a preferred embodiment, the heat dissipation can be realized by cooling liquid circulation. As shown in fig. 4, two ends of the clamp 20 are respectively provided with a liquid inlet pipe 25 and a liquid outlet pipe 26, the liquid inlet pipe 25 is connected to a cooling liquid source, the liquid outlet pipe 26 is connected to a liquid outlet, and the cooling liquid enters the clamp 20 through the liquid inlet pipe 25 and is then discharged through the liquid outlet pipe 26. The inside of the clamping piece 20 is filled with the cooling liquid, so that the cooling liquid is driven to continuously circulate and flow in the clamping piece 20, the heat generated by the transformer in the air is timely discharged, and the temperature of the transformer is effectively reduced. The structure of the clamping piece 20 is the same as the external structure of the clamping piece 20 in the traditional transformer, so that the clamping piece 20 in the traditional transformer can be directly replaced, the internal part of the transformer does not need to be changed, and the clamping piece is convenient for a user to directly replace.

In one possible embodiment, the inlet pipe 25 is disposed on the bottom surface of the clamp 20, and the outlet pipe 26 is disposed on the top surface of the clamp 20. The cooling liquid enters the interior of the clamping piece 20 through the liquid inlet pipe 25, the interior of the clamping piece 20 is filled with the cooling liquid, and then the cooling liquid is discharged through the liquid outlet pipe 26, so that the cooling liquid can be constantly filled in the interior of the clamping piece 20, and the heat generated by the transformer can be timely discharged. This arrangement requires a large power of the circulation pump to ensure that the coolant is discharged from the liquid outlet pipe 26, and is liable to cause a large pressure on the liquid inlet pipe 25 and to be damaged. In the present embodiment, the liquid inlet pipe 25 and the liquid outlet pipe 26 are respectively disposed at two ends of the clamping member 20. The liquid inlet pipe 25 is connected with a cooling liquid source, and the liquid outlet pipe 26 is connected with a liquid outlet. Since the conventional clip 20 is horizontally disposed, it is difficult for cooling water to fill the entire inside of the clip 20. Therefore, a circulating pump is also arranged, and the circulating pump is arranged outside the liquid inlet pipe 25 and drives the cooling liquid to fill the interior of the clamping piece 20. As a feasible implementation mode, the circulating pump and the transformer are separately arranged, and the circulating pump is arranged at the position of a basement or other non-personnel dense area, so that noise interference generated by the working of the circulating pump is prevented. The noise of the circulating pump is separated from the noise of the transformer, so that the noise is not interfered with each other, and the noise decibel of the transformer is controlled within the range of national standard. The cooling mode of traditional transformer is that the fan blows to coil 10 inside and outside surface and cools off, and the circulating liquid cooling that adopts in this embodiment can avoid the noise and the heat that the fan produced, reduces the whole operation noise of transformer, and reduces the power loss, and is energy-concerving and environment-protective.

The clamp 20 is welded with the liquid inlet pipe 25, the liquid outlet pipe 26 and the fixing through hole 27 in a seamless mode, and the surface of the welding position is flat and smooth. It is ensured that a closed space is formed inside the clip 20, the closed space is filled with the cooling liquid, and the cooling liquid cannot leak from the inside of the clip 20. If the cooling water leaks, the insulation aging of the transformer is caused if the cooling water leaks, the insulation level is reduced, and short circuit is caused if the cooling water leaks, so that electric sparks are generated, and the normal work of the transformer is influenced, even the transformer catches fire and explodes. Therefore, the liquid inlet pipe 25, the liquid outlet pipe 26, the fixing through hole 27 and the clamping piece 20 ensure tight welding, and cooling water does not leak. The outer surface of the clamping piece 20 is coated with the anti-rust primer firstly and then is coated with the insulating paint, so that the service life and the insulation of the clamping piece 20 are ensured. In the embodiment, the cooling liquid is tap water, so that the cost is low, the source is wide, the environment is protected, the energy is saved, and the pollution is avoided. The user can select different cooling water according to actual conditions, and can adopt liquid with larger specific heat capacity.

The cooling liquid continuously flows circularly to take away the heat inside the coil 10, so as to achieve the purpose of rapidly reducing the temperature rise of the coil 10, thereby prolonging the insulation life of the coil 10 and improving the overload capacity of the coil 10. The circulating liquid cooling mode is adopted for rapid heat dissipation, so that the operation capacity of the transformer can be improved by 30-40%, the transformer is suitable for transformers with large seasonal variation of the operation capacity, or after a certain transformer breaks down and quits operation, the rest transformers need to be overloaded to a large extent for operation, and the temperature rise of the coil 10 can still be controlled within the limit range of the national standard when the transformer is overloaded.

As shown in fig. 5 and 6, the core includes a core leg 30 and a yoke 40. The stem 30 includes a plurality of first iron core pieces 31 that stack up the setting, the iron yoke 40 includes a plurality of second iron core pieces that stack up the setting, just the both ends that first iron core piece 31 and second pasted the chip all reduce towards the tip direction, the second iron core piece is equipped with the recess with the hookup location of first iron core piece 31, the recess is sunken along the direction that first iron core piece 31 reduced, first iron core piece 31 with the crisscross concatenation of second iron core piece, the seam is the echelonment to form the magnetic flux return circuit. The step-shaped seam effectively reduces the no-load iron core loss of the transformer. Under the condition of a step-shaped seam, magnetic lines of force can vertically enter the adjacent iron core pieces, no-load current is reduced, electromagnetic force acting on the iron core pieces is reduced, the iron core pieces are pressed tightly, and noise of the transformer is obviously reduced. And the step-shaped seam can effectively reduce the no-load iron core loss of the transformer, and reduce the weight and the manufacturing consumable materials of the iron core.

When the transformer runs over electricity for a long time or the third harmonic is large, the loss generated by the iron core is large, the heat productivity is increased, the temperature rise of the iron core is high, the temperature rise often exceeds the limit value of the national standard, and the running life of the transformer is seriously influenced. In the present embodiment, when the diameter of the coil 10 is reduced, the center distance Mo between the core legs 30 is reduced, and the length of the iron yoke 40 is reduced, thereby reducing the weight of the first iron core piece 31 and the second iron core piece. And the no-load loss of the iron core is in direct proportion to the weight of the iron core, so that the hollow loss of the iron core is reduced, and the heat productivity is reduced. The aging speed of the insulating layer on the periphery of the iron core is reduced, the service life of the transformer is effectively prolonged, and the material cost of the transformer is reduced.

The first iron core pieces 31 are sequentially connected end to form a whole, so that the generation of eddy current effect on the iron core is further reduced, and the strength of the transformer iron core is increased. And the cross-section of yoke 40 is rectangle or "D" shape, when guaranteeing stem 30 and yoke 40 splice effect, reduces the weight and the preparation consumptive material of iron core and noise reduction by a wide margin, still further reduces noise and no-load loss when practicing thrift manufacturing cost. The seam forms certain clearance space, is filled with the epoxy layer in this clearance space, after the heat curing for the iron core piece forms a whole, improves transformer insulation system's dielectric strength and insulation resistance, with improvement electric insulation performance, effectively reduces the turbine effect on first iron core piece 31 and the second iron core piece, has further reduced the iron core loss.

Further, the oblique angle of the joint is 45 degrees, and the joint is provided with at least 5 grades. The structure of oblique seam can effectively improve the magnetic field distribution of iron core seam department in this embodiment for the magnetic leakage of iron core is lower, improves the efficiency of transformer by a wide margin. And the number of joints is more than 5, which can increase the mechanical connection strength after the core column 30 and the iron yoke 40 are overlapped.

During the operation of the transformer, certain noise is generated mainly due to the vibration of the iron core, and the iron yoke 40 is mostly exposed in the air, which causes great noise. The two ends of the first core piece 31 of the core column 30 are reduced towards the end part direction, and the diameter of the core column 30 is smaller than that of the core column 30 of the traditional transformer, namely the sectional area of the core column 30 is reduced, the magnetic flux density of the core column 30 is increased, the noise is increased due to the increase of the magnetic flux density, but the noise of the core column 30 is attenuated to a certain extent due to the shielding effect of the coil 10, and the overall influence is not great. The sectional area of the second core piece of the iron yoke 40 is reduced towards the end part, and is in a step shape, so that the sectional area of the second core piece is increased, the magnetic flux density of the iron yoke 40 is reduced, the noise generated by the iron yoke 40 is reduced, and the total noise generated by the iron core is effectively reduced. In addition, the contact area between the iron yoke 40 and the core column 30 is increased, which is beneficial to the heat transfer of the iron core and accelerates the heat dissipation. As the diameter of the core leg 30 is reduced, the diameter of the coil 10 wound around the core leg 30 can be reduced. The weight, the length and the resistance of the material used by the coil 10 are reduced, so that the material consumption can be effectively saved, the cost is reduced, and the effects of energy conservation and environmental protection are achieved.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A transformer with an external burst short circuit impact resistance function is characterized by comprising a transformer main body and a clamping piece, wherein the transformer main body comprises a plurality of coils and an iron core, and the clamping piece is fixedly connected with the iron core; the iron core comprises a core column and an iron yoke, and the core column is fixedly connected with the iron yoke; the coil is coaxially wound on the core column and comprises a bending part and a straight part connected with the bending part; the clamping pieces comprise an upper clamping piece and a lower clamping piece, the upper end/the lower end of the transformer main body is respectively provided with two upper clamping pieces/lower clamping pieces, two ends of the two upper clamping pieces/lower clamping pieces are respectively connected through an upper cross beam/a lower cross beam, a longitudinal beam perpendicular to the upper cross beam/the lower cross beam is arranged between the upper cross beam and the lower cross beam, and an insulating plate is arranged between the longitudinal beam and a linear part of the coil; the clamping pieces form a rectangular hollow frame, and the transformer main body is arranged in the rectangular hollow frame.

2. The transformer according to claim 1, wherein an insulating plate is disposed between adjacent coils for supporting the straight portions of the coils, and the coils are in interference fit with the insulating plate.

3. The transformer having an external sudden short circuit shock resistance function according to claim 2, wherein the insulating plate is fixed to the side members by bolts.

4. The transformer having an external burst short circuit shock resistance function according to claim 3, wherein the insulation plates are made of electrical laminated wood.

5. The transformer with the function of resisting the external short circuit impact according to claim 4, wherein the coils comprise a high-voltage coil and a low-voltage coil, the low-voltage coil is sleeved on the periphery of the core column, and the high-voltage coil is sleeved outside the low-voltage coil; and a supporting plate is arranged between the low-voltage coil and the core column and used for tightly supporting the low-voltage coil.

6. The transformer having an external burst short circuit shock resistance function according to claim 4, wherein an orthogonal projection of the insulating plate coincides with an orthogonal projection of the straight portion of the coil.

7. The transformer with the function of resisting the external sudden short circuit impact as claimed in claim 1, wherein the transformer further comprises an oil tank, and the transformer body and the clamp are both positioned inside the oil tank.

8. The transformer with external short circuit impact resistance as claimed in claim 1, wherein a cooling channel is provided inside the clamping member, a liquid inlet pipe and a liquid outlet pipe are respectively provided at two ends of the clamping member, the liquid inlet pipe is connected to a cooling liquid source, the liquid outlet pipe is connected to a liquid outlet, and the cooling liquid enters the cooling channel through the liquid inlet pipe and is discharged from the liquid outlet pipe.

9. The transformer of claim 1, wherein the core leg comprises a plurality of first core pieces stacked one on another, the yoke comprises a plurality of second core pieces stacked one on another, cross sections of the first core pieces and the second core pieces are stepped, two ends of the first core pieces are reduced toward end portions, a groove is formed at a connection position of the second core pieces and the first core pieces, the groove is recessed along a direction in which the first core pieces are reduced, and the reduced ends of the first core pieces are stacked on the grooves of the second core pieces.

10. The transformer with the function of resisting the external sudden short circuit impact as claimed in claim 1, further comprising a circulating pump, wherein the circulating pump is arranged outside the liquid inlet pipe and drives cooling water to fill the water cooling pipeline inside the clamping piece.