High-stability transformer

Abstract

The invention relates to the technical field of transformers, and discloses a high-stability transformer which comprises a base support, an iron core and a winding, clamping plate assemblies are fixedly installed on the front side and the rear side of the iron core, the lower ends of the clamping plate assemblies are fixedly connected with the base support, an iron core column of the iron core is sleeved with the winding, and a resonance choking mechanism is installed on the iron core. The resonance choking mechanism comprises an upper pressing plate, a lower pressing plate, an inhaul cable and a balancing weight. According to the high-stability transformer, the resonance choking mechanism, the upper pressing plate and the lower pressing plate are arranged on the iron core to serve as boundary supports of the iron core, so that vibration of the iron core is reduced, the vibration of the iron core is transmitted to the inhaul cable and the balancing weight, the balancing weight generates vibration in the direction opposite to that of the iron core, vibration energy of the iron core is counteracted according to the law of conservation of energy, and the stability of the transformer is improved. The natural vibration frequency of the iron core is prevented from being close to the magnetostrictive vibration frequency of the silicon steel sheet, resonance is avoided, the noise of the transformer is reduced, and the transformer runs more stably.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a high-stability transformer. Background Art

[0002] With the widespread application of transformers, the safety issues of transformers have attracted more and more attention. In the prior art, a patent document with a publication number of CN113555194B discloses a high-stability transformer, including a transformer body, an auxiliary heat dissipation base is arranged on the bottom surface of the transformer body, two mounting bases are arranged below the auxiliary heat dissipation base, and auxiliary heat dissipation mechanisms are arranged at both ends of the auxiliary heat dissipation base. The auxiliary heat dissipation mechanism includes a heat dissipation fan. The invention can effectively block external rain and sunlight by arranging an auxiliary heat dissipation mechanism, a rain and sun shading mechanism, a connecting mechanism and an adjusting mechanism, slow down the corrosion rate of the transformer shell, reduce the temperature rise rate inside the transformer, and effectively extend the service life of the transformer.

[0003] In actual use, dry-type transformers are safer than oil-immersed transformers, but the noise problem of dry-type transformers is particularly prominent. Transformer noise mainly comes from two sources: 1) Transformer body noise, which is mainly caused by the vibration of the transformer core, windings and oil tank (including magnetic shielding, etc.); 2) Transformer cooling device noise, which is mainly caused by the transformer cooling fan and submersible oil pump.

[0004] Studies have shown that the vibration of the transformer mainly comes from the vibration of the iron core. In order to achieve the effect of vibration reduction and noise reduction and ensure the stable operation of the transformer, the vibration of the iron core should be controlled. For specific reference: Zhong Xingming. Research on vibration and noise of dry-type transformers [D]. South China University of Technology, 2010. However, the existing vibration reduction and noise reduction measures for transformers are still not perfect. When the inherent self-resonance frequency of the iron core is close to the magnetostrictive vibration frequency of the silicon steel sheet, the iron core will resonate, causing a sudden increase in the noise of the transformer body, which needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to solve the defect in the prior art that the existing transformer has serious noise caused by resonance generated by the iron core, and to propose a high-stability transformer.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a high-stability transformer, including a base bracket, an iron core and a winding, the iron core includes an upper iron yoke located on the upper side, a lower iron yoke located on the lower side and an iron core column located in the middle, a clamping plate assembly is fixedly installed on the front and rear sides of the iron core, the lower end of the clamping plate assembly is fixedly connected to the base bracket, the winding is sleeved on the iron core column of the iron core, and a resonance strangulation mechanism is installed on the iron core.

[0007] The resonance control mechanism includes an upper pressure plate, a lower pressure plate, a cable and a counterweight. The upper pressure plate and the lower pressure plate are fixedly connected to the clamping plate assembly, and the upper pressure plate and the lower pressure plate are respectively pressed against the upper and lower side planes of the iron core. Two cables are arranged on both sides of the iron core, and the two cables are respectively fixedly connected to the two ends of the upper pressure plate and the lower pressure plate. The two cables are in a tensioned state, and a plurality of counterweights are fixedly installed on the surface of the two cables. The vibration of the counterweight is used to offset the vibration of the iron core, so as to avoid the natural self-vibration frequency of the iron core being close to the magnetostrictive vibration frequency of the silicon steel sheet, and avoid resonance. Vibration can cause loosening, falling off and noise of the connecting parts, thereby ensuring the high stability of the transformer.

[0008] Preferably, the clamping plate assembly includes two upper clamping plates, two lower clamping plates and multiple vertical clamping plates, the upper clamping plates and the lower clamping plates are respectively fixedly connected to the two ends of the vertical clamping plates, the lower clamping plate is fixedly connected to the base bracket, and a silicone rubber column is arranged between the lower clamping plate and the base bracket, the two upper clamping plates are clamped and fixed to the front and rear sides of the upper iron yoke of the iron core, the two lower clamping plates are clamped and fixed to the front and rear sides of the lower iron yoke of the iron core, the multiple vertical clamping plates are divided into two groups, the two groups of vertical clamping plates are clamped and fixed to the front and rear sides of the core column of the iron core, silicone rubber pads are arranged at the upper and lower ends of the winding, the upper clamping plates and the lower clamping plates are clamped and fixed to the two ends of the winding by the silicone rubber pads, the upper pressure plate and the lower pressure plate serve as boundary supports of the iron core to reduce the vibration of the iron core, and the influence of the vibration on the base bracket is reduced by arranging the silicone rubber column.

[0009] Preferably, a first protective cover and a second protective cover are respectively provided on the upper and lower sides of the iron core, the first protective cover is fixedly connected to the upper clamping plate, and the second protective cover is fixedly connected to the lower clamping plate, and two mounting tubes are fixedly installed between the first protective cover and the second protective cover, and rubber sleeves are provided in the two mounting tubes, and the two cables pass through the rubber sleeves in the two mounting tubes respectively, and the counterweight blocks are arranged in the rubber sleeves, and the rubber sleeves can have a good vibration isolation effect.

[0010] Preferably, cooling fans are fixedly mounted on both ends of the first protective cover and the second protective cover, and a plurality of air guide holes are provided on the surfaces of the first protective cover and the second protective cover close to the iron core.

[0011] When the cooling fans at both ends of the first protective cover are in operation, the air in the first protective cover is discharged, a negative pressure is formed in the first protective cover, and the external air enters the first protective cover through the air guide holes.

[0012] When the cooling fans at both ends of the second protective cover are running, external air is input into the second protective cover, positive pressure is formed in the second protective cover, and the air in the second protective cover is discharged from the guide air holes. The blowing of the cooling fans and the guide effect of the first and second protective covers promote the flow of air around the core and winding, thereby accelerating the heat dissipation.

[0013] Preferably, a plurality of induction rings are fixedly installed in the installation tube, a plurality of induction coils are embedded in each induction ring, and the plurality of induction coils are arranged in a circular array in the induction ring. A magnetic block corresponding to each induction coil is embedded in the counterweight block. The induction coil is electrically connected to the cooling fan through a power supply filter, and the speed of the cooling fan is controlled by changing the induced current of the induction coil, so that the speed of the cooling fan is positively correlated with the vibration frequency of the iron core, which can meet the requirements of high-load heat dissipation and low heat dissipation noise at low load.

[0014] Preferably, the winding includes a high-voltage coil arranged on the outside and a low-voltage coil arranged on the inside, and heat dissipation gaps are reserved between the high-voltage coil and the low-voltage coil, and between the pressure coil and the iron core. The guide air holes on the first protective cover face the surface of the iron core and the upper opening of the heat dissipation gap, and the guide air holes on the second protective cover face the surface of the iron core and the lower opening of the heat dissipation gap. Air is blown into the heat dissipation gap to dissipate heat from the winding.

[0015] The present invention has the following beneficial effects: 1. The high-stability transformer proposed in the present invention provides a resonance control mechanism on the iron core. The upper pressure plate and the lower pressure plate serve as boundary supports of the iron core to reduce the vibration of the iron core. The vibration of the iron core is transmitted to the cable and the counterweight. The counterweight generates vibration in the opposite direction to the iron core. According to the law of conservation of energy, the vibration energy of the iron core is offset, and the natural self-resonance frequency of the iron core is prevented from being close to the magnetostrictive vibration frequency of the silicon steel sheet, thereby avoiding resonance, reducing the noise of the transformer, and making the transformer run more stably.

[0016] 2. The high-stability transformer proposed in the present invention is provided with a first protective cover and a second protective cover on the upper and lower sides of the iron core, and the cooling fan arranged inside the transformer can promote air flow well, thereby accelerating the heat dissipation of the iron core. Due to changes in the resonant frequency and mechanical stress, the noise will increase with the increase in the temperature of the silicon steel sheet. Accelerating the heat dissipation of the iron core can not only ensure the safety and stability of the transformer operation, but also reduce the vibration of the silicon steel sheet caused by the increase in temperature, thereby meeting the use requirements of heat dissipation and noise reduction.

[0017] 3. The high-stability transformer proposed in the present invention has an induction ring arranged in the installation tube and a magnetic block arranged on the counterweight block. When the vibration of the iron core drives the counterweight block to vibrate, the magnetic block is prompted to move back and forth, so that the induction coil in the induction ring generates an induced current. The induced current is introduced through the processing of the filter circuit and the amplifier circuit and drives the cooling fan to operate, so that the rotation speed of the cooling fan is positively correlated with the vibration frequency of the iron core, that is, when the transformer is operating at high load, the natural frequency of the iron core increases, and the rotation speed of the cooling fan also increases accordingly, thereby improving the heat dissipation rate of the transformer. Since the transformer noise mainly includes the transformer body noise and the heat dissipation noise, when the transformer is operating at low load, the rotation speed of the cooling fan also decreases accordingly, which can meet both the demand for high-load heat dissipation and the requirement for low heat dissipation noise at low load. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the first embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the first embodiment of the present invention Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention; Figure 4 This is a schematic diagram of the front cross-section structure of the second embodiment of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of the local structure in FIG. Figure 6 The top-sectional structure diagram of the installation tube proposed in the present invention.

[0019] In the figure: 1. base bracket; 2. iron core; 3. winding; 4. upper pressure plate; 5. lower pressure plate; 6. cable; 7. counterweight; 8. upper clamping plate; 9. lower clamping plate; 10. vertical clamping plate; 11. silicone rubber column; 12. silicone rubber pad; 13. first protective cover; 14. second protective cover; 15. mounting tube; 16. rubber sleeve; 17. cooling fan; 18. air guide hole; 19. induction ring; 20. magnetic block; 21. heat dissipation gap. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention. Example

[0022] Reference Figure 1-Figure 2 A high-stability transformer includes a base bracket 1, an iron core 2 and a winding 3. The iron core 2 includes an upper iron yoke located on the upper side, a lower iron yoke located on the lower side and an iron core column located in the middle. The upper iron yoke, the lower iron yoke and the iron core column are all stacked by multiple silicon steel sheets. A clamping plate assembly is fixedly installed on the front and rear sides of the iron core 2. The lower end of the clamping plate assembly is fixedly connected to the base bracket 1. The winding 3 is sleeved on the iron core column of the iron core 2. It should be noted that the iron core 2 and the winding 3 belong to the conventional settings of the transformer in the prior art and will not be described here.

[0023] Among them, the splint assembly includes two upper splints 8, two lower splints 9 and multiple vertical splints 10. The upper splints 8 and the lower splints 9 are fixedly connected to the two ends of the vertical splints 10 respectively, the lower splint 9 is fixedly connected to the base bracket 1, and a silicone rubber column 11 is arranged between the lower splint 9 and the base bracket 1.

[0024] The two upper clamps 8 are clamped and fixed on the front and rear sides of the upper iron yoke of the iron core 2, the two lower clamps 9 are clamped and fixed on the front and rear sides of the lower iron yoke of the iron core 2, and the multiple vertical clamps 10 are divided into two groups. The two groups of vertical clamps 10 are clamped and fixed on the front and rear sides of the core column of the iron core 2. Silicone rubber pads 12 are provided at the upper and lower ends of the winding 3, and the upper clamps 8 and the lower clamps 9 are clamped and fixed at both ends of the winding 3 by the silicone rubber pads 12.

[0025] A resonance control mechanism is installed on the iron core 2, and the resonance control mechanism includes an upper pressure plate 4, a lower pressure plate 5, a cable 6 and a counterweight 7. The upper pressure plate 4 and the lower pressure plate 5 are fixedly connected to the clamping plate assembly, and the upper pressure plate 4 and the lower pressure plate 5 are respectively pressed against the upper and lower side planes of the iron core 2. Two cables 6 are arranged on both sides of the iron core 2, and the two cables 6 are respectively fixedly connected to the two ends of the upper pressure plate 4 and the lower pressure plate 5. The two cables 6 are in a tensioned state, and a plurality of counterweights 7 are fixedly installed on the surfaces of the two cables 6.

[0026] It should be noted that dry-type transformers and oil-immersed transformers have different application scenarios. Oil-immersed transformers have an outer shell and are filled with insulating oil, while dry-type transformers are mostly exposed to the air and are cooled by self-heating air or fans. The noise pollution of dry-type transformers is more serious. The following is an introduction taking dry-type transformers as an example.

[0027] The vibration and noise test of the dry-type transformer was conducted by combining the vibration test system with the noise test system. The test results show that the vibration of the core 2 of the whole machine is greater than that of the clamp and the coil. In order to achieve the effect of reducing vibration and noise of the transformer, the vibration of the core 2 should be mainly controlled. The vibration of the core 2 in the free state is greater than that when it is supported upward. The influence of different support conditions on the vibration of the core 2 is very obvious. Therefore, appropriate support can reduce the vibration of the core 2. For specific reference: Zhong Xingming. Research on vibration and noise of dry-type transformers [D]. South China University of Technology, 2010.

[0028] The high-stability transformer proposed in the present invention provides a resonance control mechanism on the iron core 2, and the upper pressure plate 4 and the lower pressure plate 5 serve as the boundary support of the iron core 2 to reduce the vibration of the iron core 2. A cable 6 is installed between the upper pressure plate 4 and the lower pressure plate 5, and a counterweight 7 is installed on the cable 6. The vibration of the iron core 2 is transmitted to the cable 6 and the counterweight 7. The counterweight 7 generates vibration in the opposite direction to the iron core 2. According to the law of conservation of energy, the vibration energy of the iron core 2 is offset, the inherent self-resonance frequency of the iron core 2 is prevented from being close to the magnetostrictive vibration frequency of the silicon steel sheet, the resonance is avoided, the noise of the transformer is reduced, and the operation of the transformer is more stable. Example

[0029] Reference Figure 3-Figure 6 , which is different from Example 1, a first protective cover 13 and a second protective cover 14 are respectively provided on the upper and lower sides of the iron core 2, the first protective cover 13 is fixedly connected to the upper clamping plate 8, and the second protective cover 14 is fixedly connected to the lower clamping plate 9, and two mounting tubes 15 are fixedly installed between the first protective cover 13 and the second protective cover 14, and rubber sleeves 16 are provided in the two mounting tubes 15, and the two cables 6 pass through the rubber sleeves 16 in the two mounting tubes 15 respectively, and the counterweight 7 is arranged in the rubber sleeve 16.

[0030] In this embodiment, cooling fans 17 are fixedly installed at both ends of the first protective cover 13 and the second protective cover 14, and a plurality of air guide holes 18 are opened on the surfaces of the first protective cover 13 and the second protective cover 14 close to the iron core 2. Figure 3 .

[0031] In this embodiment, a plurality of induction rings 19 are fixedly installed in the installation tube 15, and a plurality of induction coils are embedded in each induction ring 19. The plurality of induction coils are arranged in a circular array in the induction ring 19, and a magnetic block 20 corresponding to each induction coil is embedded in the counterweight 7. Figure 6 .

[0032] During use, after the transformer is running, the counterweight block 7 generates vibrations of different frequencies, the magnetic field of the magnetic block 20 undergoes displacement changes, the induction coil cuts the magnetic field of the magnetic block 20, and generates an induced current. The induction coil is electrically connected to the cooling fan 17 through a power filter and an amplifier circuit. The change in the induced current of the induction coil controls the change in the speed of the cooling fan 17. The induced current is introduced into the cooling fan 17 to drive the cooling fan 17 to operate. The larger the induced current, the higher the speed of the cooling fan 17.

[0033] Among them, the power filter is a filter circuit composed of capacitors, inductors and resistors, which can effectively filter out the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, or eliminate the power signal after a specific frequency; the basic amplifier circuit is a kind of circuit, which can be used in circuit construction. The input resistance of the basic amplifier circuit is very low, generally only a few ohms to tens of ohms, but its output resistance is very high. The basic direct amplifier circuit can amplify both AC signals and DC signals and signals that change very slowly, and has high signal transmission efficiency, simple structure, and easy integration. This coupling method is often used in integrated circuits. This part belongs to the common knowledge of electrical engineering and will not be introduced here.

[0034] like Figure 5 As shown, when the cooling fans 17 at both ends of the first protective cover 13 are running, the air in the first protective cover 13 is discharged, a negative pressure is formed in the first protective cover 13, and the external air enters the first protective cover 13 through the guide air holes 18.

[0035] When the cooling fans 17 at both ends of the second protective cover 14 are in operation, external air is input into the second protective cover 14 , a positive pressure is formed in the second protective cover 14 , and the air in the second protective cover 14 is discharged through the guide air holes 18 .

[0036] refer to Figure 3 The winding 3 includes a high-voltage coil arranged on the outside and a low-voltage coil arranged on the inside. A heat dissipation gap 21 is reserved between the high-voltage coil and the low-voltage coil, and between the pressure coil and the iron core 2. The guide air holes 18 on the first protective cover 13 face the surface of the iron core 2 and the upper opening of the heat dissipation gap 21, and the guide air holes 18 on the second protective cover 14 face the surface of the iron core 2 and the lower opening of the heat dissipation gap 21. Through the blowing of the cooling fan 17 and the guiding effect of the first protective cover 13 and the second protective cover 14, the flow of air around the iron core 2 and the winding 3 is promoted, which has the effect of accelerating heat dissipation.

[0037] A first protective cover 13 and a second protective cover 14 are arranged on the upper and lower sides of the iron core 2, and a cooling fan 17 arranged therein can promote air flow well, thereby accelerating the heat dissipation of the iron core 2. Due to changes in the resonant frequency and mechanical stress, the noise will increase with the increase in the temperature of the silicon steel sheet. Accelerating the heat dissipation of the iron core 2 can not only ensure the safety and stability of the transformer operation, but also reduce the vibration of the silicon steel sheet caused by the increase in temperature, thereby meeting the use requirements of heat dissipation and noise reduction.

[0038] The high-stability transformer proposed in the present invention has an induction ring 19 arranged in the installation tube 15, and a magnetic block 20 arranged on the counterweight block 7. When the iron core 2 vibrates and drives the counterweight block 7 to vibrate, the magnetic block 20 is prompted to move back and forth, so that the induction coil in the induction ring 19 generates an induced current. The induced current is introduced into and drives the cooling fan 17 to operate after being processed by the filtering circuit and the amplifying circuit, so that the rotation speed of the cooling fan 17 is positively correlated with the vibration frequency of the iron core 2, that is, when the transformer is operating at a high load, the natural frequency of the iron core 2 increases, and the rotation speed of the cooling fan 17 also increases accordingly, thereby improving the heat dissipation rate of the transformer. Since the transformer noise mainly includes the transformer body noise and the heat dissipation noise, when the transformer is operating at a low load, the rotation speed of the cooling fan 17 also decreases accordingly, which can meet both the requirements of high-load heat dissipation and the requirements of low heat dissipation noise at a low load.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-stability transformer, comprising a base support (1), an iron core (2) and a winding (3), characterized in that: The iron core (2) comprises an upper iron yoke located on the upper side, a lower iron yoke located on the lower side and an iron core column located in the middle; a clamping plate assembly is fixedly installed on the front and rear sides of the iron core (2); the lower end of the clamping plate assembly is fixedly connected to the base bracket (1); the winding (3) is sleeved on the iron core column of the iron core (2); and a resonance strangling mechanism is installed on the iron core (2); The resonance suppression mechanism comprises an upper pressure plate (4), a lower pressure plate (5), a cable (6) and a counterweight (7); the upper pressure plate (4) and the lower pressure plate (5) are both fixedly connected to the clamping plate assembly, and the upper pressure plate (4) and the lower pressure plate (5) are respectively pressed against the upper and lower side planes of the iron core (2); two cables (6) are arranged on both sides of the iron core (2), and the two cables (6) are respectively fixedly connected to the two ends of the upper pressure plate (4) and the lower pressure plate (5); the two cables (6) are in a tensioned state, and a plurality of counterweights (7) are respectively fixedly installed on the surfaces of the two cables (6).

2. A high stability transformer according to claim 1, characterized in that: The clamping plate assembly comprises two upper clamping plates (8), two lower clamping plates (9) and a plurality of vertical clamping plates (10); the upper clamping plates (8) and the lower clamping plates (9) are respectively fixedly connected to two ends of the vertical clamping plates (10); the lower clamping plates (9) are fixedly connected to the base bracket (1); and a silicone rubber column (11) is provided between the lower clamping plates (9) and the base bracket (1).

3. A high stability transformer according to claim 2, characterized in that: The two upper clamping plates (8) are clamped and fixed on the front and rear sides of the upper iron yoke of the iron core (2), and the two lower clamping plates (9) are clamped and fixed on the front and rear sides of the lower iron yoke of the iron core (2). The plurality of vertical clamping plates (10) are divided into two groups, and the two groups of vertical clamping plates (10) are clamped and fixed on the front and rear sides of the iron core column of the iron core (2). Silicon rubber pads (12) are provided at the upper and lower ends of the winding (3), and the upper clamping plates (8) and the lower clamping plates (9) are clamped and fixed at both ends of the winding (3) by the silicone rubber pads (12).

4. A high stability transformer according to claim 3, characterized in that: A first protective cover (13) and a second protective cover (14) are respectively provided on the upper and lower sides of the iron core (2); the first protective cover (13) is fixedly connected to the upper clamping plate (8); the second protective cover (14) is fixedly connected to the lower clamping plate (9); two mounting tubes (15) are fixedly installed between the first protective cover (13) and the second protective cover (14); rubber sleeves (16) are provided in the two mounting tubes (15); the two cables (6) respectively pass through the rubber sleeves (16) in the two mounting tubes (15); and the counterweight (7) is arranged in the rubber sleeve (16).

5. A high stability transformer according to claim 4, characterized in that: Cooling fans (17) are fixedly mounted on both ends of the first protective cover (13) and the second protective cover (14), and a plurality of air guide holes (18) are provided on the surfaces of the first protective cover (13) and the second protective cover (14) close to the iron core (2).

6. A high stability transformer according to claim 5, characterized in that: A plurality of induction rings (19) are fixedly mounted in the mounting tube (15), and a plurality of induction coils are embedded in each of the induction rings (19). The plurality of induction coils are arranged in a circular array in the induction rings (19). A magnetic block (20) corresponding to each of the induction coils is embedded in the counterweight (7). The induction coils are electrically connected to the cooling fan (17) via a power filter, and the rotation speed of the cooling fan (17) is controlled by the change of the induced current of the induction coils.

7. A high stability transformer according to claim 6, characterized in that: When the cooling fans (17) at both ends of the first protective cover (13) are in operation, the air in the first protective cover (13) is discharged, a negative pressure is formed in the first protective cover (13), and external air enters the first protective cover (13) through the air guide holes (18).

8. A high stability transformer according to claim 7, characterized in that: When the cooling fans (17) at both ends of the second protective cover (14) are in operation, external air is input into the second protective cover (14), a positive pressure is formed in the second protective cover (14), and the air in the second protective cover (14) is discharged through the air guide holes (18).

9. A high stability transformer according to claim 8, characterized in that: The winding (3) comprises a high-voltage coil arranged on the outside and a low-voltage coil arranged on the inside, a heat dissipation gap (21) is reserved between the high-voltage coil and the low-voltage coil, and between the pressure coil and the iron core (2), the air guide holes (18) on the first protective cover (13) face the surface of the iron core (2) and the upper opening of the heat dissipation gap (21), and the air guide holes (18) on the second protective cover (14) face the surface of the iron core (2) and the lower opening of the heat dissipation gap (21).

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