A high-stability transformer

Abstract

The present invention relates to the technical field of transformers, and discloses a high-stability transformer, including a base bracket, an iron core and a winding, wherein a clamping plate assembly is fixedly installed on the front and rear sides of the iron core, and the lower end of the clamping plate assembly is fixedly connected to the base bracket, and the winding is sleeved on the iron core column of the iron core, and a resonance strangling mechanism is installed on the iron core, and the resonance strangling mechanism includes an upper pressure plate, a lower pressure plate, a cable and a counterweight. The high-stability transformer proposed by the present invention arranges a resonance strangling mechanism on the iron core, and 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 vibration of the iron core is transmitted to the cable and the counterweight, and the counterweight generates vibration in the opposite direction of the iron core. According to the law of conservation of energy, the vibration energy of the iron core is offset, and the inherent self-vibration 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 operation of the transformer more stable.

Description

Technical Field

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

[0002] With the wide application of transformers, the safety issues of transformers have attracted more and more attention. In the prior art, a patent document with the publication number CN113555194B discloses a high-stability transformer, including a transformer main body. An auxiliary heat dissipation base is provided at the bottom surface of the transformer main body. Two mounting bases are provided below the auxiliary heat dissipation base. Auxiliary heat dissipation mechanisms are provided at both ends of the auxiliary heat dissipation base. The auxiliary heat dissipation mechanism includes a heat dissipation fan. By providing an auxiliary heat dissipation mechanism, a rain and sun protection mechanism, a connection mechanism, and an adjustment mechanism, the invention can effectively block external rain and sunlight, slow down the corrosion rate of the transformer shell, reduce the internal temperature rise rate of the transformer, and effectively extend the service life of the transformer.

[0003] In the actual use process, compared with oil-immersed transformers, dry-type transformers have higher safety, but the noise problem of dry-type transformers is particularly prominent. There are mainly two noise sources in transformer noise: 1) The noise of the transformer body, mainly generated by the vibration of the transformer core, winding, and oil tank (including magnetic shielding, etc.); 2) The noise of the transformer cooling device, mainly caused by the transformer cooling fan and submersible pump.

[0004] Research shows that the vibration of the transformer mainly comes from the vibration of the iron core. To achieve the effect of vibration reduction and noise reduction and ensure the stable operation of the transformer, the vibration of its iron core should be mainly controlled. For specific reference: Zhong Xingming. Research on the 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 natural vibration frequency of the iron core is close to the magnetostrictive vibration frequency of the silicon steel sheet, the iron core will generate resonance, causing a sudden increase in the noise of the transformer body, which urgently needs to be solved. Summary of the Invention

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

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A high-stability transformer, including a base bracket, an iron core, and a winding. The iron core is stacked by a plurality of silicon steel sheets. Clamping plate assemblies are fixedly installed on the front and rear sides of the iron core. The lower ends of the clamping plate assemblies are fixedly connected to the base bracket. The winding is sleeved on the iron core column of the iron core. A resonance suppression mechanism is installed on the iron core.

[0007] The resonance suppression mechanism includes an upper pressure plate, a lower pressure plate, stay cables, and counterweights. The upper pressure plate and the lower pressure plate are both fixedly connected to the clamping plate assembly, and the upper pressure plate and the lower pressure plate respectively abut against the upper and lower side planes of the iron core. Two stay cables are arranged on both sides of the iron core, and the two stay cables are respectively fixedly connected to the two ends of the upper pressure plate and the lower pressure plate. The two stay cables are in a tensioned state, and a plurality of counterweights are fixedly installed on the surfaces of the two stay cables respectively. The vibration of the counterweights is used to offset the vibration of the iron core, avoiding the natural self-vibration frequency of the iron core from approaching the magnetostrictive vibration frequency of the silicon steel sheet, avoiding resonance. Vibration will cause loosening, falling off and noise of the connecting parts, ensuring the high stability of the transformer.

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

[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, the second protective cover is fixedly connected to the lower clamping plate. Two mounting cylinders are fixedly installed between the first protective cover and the second protective cover. Rubber sleeves are provided in both of the two mounting cylinders. The two stay cables respectively pass through the rubber sleeves in the two mounting cylinders, and the counterweights are arranged in the rubber sleeves. The rubber sleeves can achieve a good vibration isolation effect.

[0010] Preferably, heat dissipation fans are fixedly installed at both ends of the first protective cover and the second protective cover. A plurality of air guide holes are opened on the surfaces of the first protective cover and the second protective cover close to the iron core.

[0011] Among them, when the heat dissipation fans at both ends of the first protective cover operate, 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 heat dissipation fans at both ends of the second protective cover operate, the external air is input into the second protective cover, a positive pressure is formed in the second protective cover, and the air in the second protective cover is discharged through the air guide holes. Through the blowing of the heat dissipation fans and the air guiding effect of the first protective cover and the second protective cover, the flow of the air around the iron core and the winding is promoted, achieving the effect of accelerating heat dissipation.

[0013] Preferably, a plurality of induction rings are fixedly installed in the installation cylinder, and a plurality of induction coils are embedded in each induction ring. 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. The induction coil is electrically connected to the cooling fan through a power filter. The rotation speed of the cooling fan is controlled by the change of the induction current of the induction coil, so that the rotation speed of the cooling fan is positively correlated with the vibration frequency of the iron core, which can not only meet the high-load heat dissipation requirements, but also meet the low-heat dissipation noise requirements under low load.

[0014] Preferably, the winding includes a high-voltage coil arranged on the outside and a low-voltage coil arranged on the inside. There are heat dissipation gaps reserved between the high-voltage coil and the low-voltage coil, and between the low-voltage coil and the iron core. The diversion 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 diversion air holes on the second protective cover face the surface of the iron core and the lower opening of the heat dissipation gap, blowing air into the heat dissipation gap to play a role in dissipating heat from the winding.

[0015] The present invention has the following beneficial effects:

[0016] 1. For the high-stability transformer proposed by the present invention, by setting a resonance suppression mechanism on the iron core, the upper pressing plate and the lower pressing plate serve as the 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, and 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, avoiding the natural self-vibration frequency of the iron core from approaching the magnetostrictive vibration frequency of the silicon steel sheet, avoiding resonance, reducing the noise of the transformer, and making the operation of the transformer more stable.

[0017] 2. For the high-stability transformer proposed by the present invention, the first protective cover and the second protective cover are arranged on the upper and lower sides of the iron core, and the cooling fan arranged inside can well promote the air flow, playing a role in accelerating the heat dissipation of the iron core. Due to the change of the resonance frequency and mechanical stress, the noise will increase with the increase of 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 operation of the transformer, but also reduce the vibration of the silicon steel sheet caused by the increase of temperature, meeting the use requirements of heat dissipation and noise reduction.

[0018] 3. The high-stability transformer proposed by the present invention is provided with an induction ring in the installation cylinder and a magnetic block on the counterweight. When the vibration of the iron core drives the vibration of the counterweight, it causes the magnetic block to reciprocate, generating an induced current in the induction coil within the induction ring. This induced current is processed by a filtering circuit and an amplification circuit and then introduced to drive the operation of the cooling fan, achieving a positive correlation between the rotational speed of the cooling fan and the vibration frequency of the iron core. That is, when the transformer operates at a high load, the natural vibration frequency of the iron core increases, and the rotational speed of the cooling fan also increases, improving the heat dissipation rate of the transformer. Since the transformer noise mainly includes the noise of the transformer body and the noise of heat dissipation, when the transformer operates at a low load, the rotational speed of the cooling fan also decreases, which can not only meet the high-load heat dissipation requirements but also meet the requirements of low heat dissipation noise at low loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic three-dimensional structure diagram of Embodiment 1 proposed by the present invention Figure One ;

[0020] Figure 2 is a schematic three-dimensional structure diagram of Embodiment 1 proposed by the present invention Figure Two ;

[0021] Figure 3 is a schematic three-dimensional structure diagram of Embodiment 2 proposed by the present invention;

[0022] Figure 4 is a schematic front sectional structure diagram of Embodiment 2 proposed by the present invention;

[0023] Figure 5 is Figure 4 a schematic enlarged view of a partial structure in

[0024] Figure 6 is a schematic top sectional structure diagram of the installation cylinder proposed by the present invention.

[0025] In the figures: 1 base bracket, 2 iron core, 3 winding, 4 upper pressing plate, 5 lower pressing plate, 6 cable, 7 counterweight, 8 upper clamping plate, 9 lower clamping plate, 10 vertical clamping plate, 11 silicone rubber column, 12 silicone rubber cushion block, 13 first protective cover, 14 second protective cover, 15 installation cylinder, 16 rubber sleeve, 17 cooling fan, 18 diversion air hole, 19 induction ring, 20 magnetic block, 21 heat dissipation gap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present invention. Embodiment

[0028] Referring to 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 is formed by stacking a plurality of silicon steel sheets. Clamping plate assemblies are fixedly installed on the front and rear sides of the iron core 2. The lower ends of the clamping plate assemblies are fixedly connected to the base bracket 1. The winding 3 is sleeved on the core column of the iron core 2. It should be noted that the iron core 2 and the winding 3 are conventional settings of a transformer in the prior art and will not be elaborated here.

[0029] Among them, the clamping plate assembly includes 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 both 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.

[0030] The two upper clamping plates 8 are clamped and fixed on the front and rear sides of the upper yoke of the iron core 2. The two lower clamping plates 9 are clamped and fixed on the front and rear sides of the lower 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 core column of the iron core 2. Silicone rubber pads 12 are provided at both the upper and lower ends of the winding 3. The upper clamping plates 8 and the lower clamping plates 9 are both clamped and fixed to both ends of the winding 3 through the silicone rubber pads 12.

[0031] A resonance suppression mechanism is installed on the iron core 2. The resonance suppression 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 both fixedly connected to the clamping plate assembly, and the upper pressure plate 4 and the lower pressure plate 5 respectively abut 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 both 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.

[0032] It should be noted that the application scenarios of dry-type transformers and oil-immersed transformers are different. Oil-immersed transformers have a casing and are filled with insulating oil inside, while dry-type transformers are mostly exposed to the air and rely on self-heat air cooling or fan cooling. The noise pollution of dry-type transformers is relatively serious. Here, a dry-type transformer is taken as an example for introduction.

[0033] Using a vibration test system combined with a noise test system, a vibration and noise test study was conducted on the entire dry-type transformer. The test results show that the vibration of the core 2 of the entire machine is greater than that of the clamping parts and coils. To achieve the effect of reducing vibration and noise of the transformer, the vibration of its core 2 should be mainly controlled. When 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 the Vibration and Noise of Dry-Type Transformers [D]. South China University of Technology, 2010.

[0034] For the high-stability transformer proposed by the present invention, by setting a resonance suppression mechanism on the core 2, the upper pressure plate 4 and the lower pressure plate 5 serve as the boundary supports of the core 2 to reduce the vibration of the 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 core 2 is transmitted to the cable 6 and the counterweight 7, and the counterweight 7 generates vibration in the opposite direction to the core 2. According to the law of conservation of energy, the vibration energy of the core 2 is offset, avoiding the natural vibration frequency of the core 2 from approaching the magnetostrictive vibration frequency of the silicon steel sheet, avoiding resonance, reducing the noise of the transformer, and making the operation of the transformer more stable. Embodiment

[0035] Refer to Figure 3 - Figure 6 , different from Embodiment 1, a first protective cover 13 and a second protective cover 14 are respectively arranged on the upper and lower sides of the 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. Two mounting cylinders 15 are fixedly installed between the first protective cover 13 and the second protective cover 14. Rubber sleeves 16 are arranged in both of the two mounting cylinders 15, and the two cables 6 respectively pass through the rubber sleeves 16 in the two mounting cylinders 15, and the counterweight 7 is arranged in the rubber sleeve 16.

[0036] In this embodiment, heat dissipation fans 17 are fixedly installed at both ends of the first protective cover 13 and the second protective cover 14, and a plurality of diversion air holes 18 are respectively opened on the surfaces of the first protective cover 13 and the second protective cover 14 close to the core 2. For details, see Figure 3 .

[0037] In this embodiment, a plurality of induction rings 19 are fixedly installed in the mounting cylinder 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 magnetic blocks 20 corresponding to the induction coils one by one are embedded in the counterweight 7. For details, see Figure 6 .

[0038] During use, after the transformer operates, the counterweight 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 to generate an induced current, and the induction coil is electrically connected to the cooling fan 17 through a power filter and an amplifier circuit. The rotation speed of the cooling fan 17 is controlled by the change in the induced current of the induction coil. The induced current is introduced into the cooling fan 17 to drive the cooling fan 17 to operate. The greater the induced current, the higher the rotation speed of the cooling fan 17.

[0039] Among them, the power filter is a filter circuit composed of capacitors, inductors, and resistors, which can effectively filter out specific frequency points in the power line or frequencies outside that 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 type of circuit that can be applied in circuit construction. The input resistance of the basic amplifier circuit is very low, generally only a few ohms to dozens 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, with advantages such as simple structure and easy integration. This coupling method is mostly used in integrated circuits. This part belongs to common knowledge in electricity and will not be introduced in detail here.

[0040] As Figure 5 shown, when the cooling fans 17 at both ends of the first protective cover 13 operate, the air inside the first protective cover 13 is discharged, a negative pressure is formed inside the first protective cover 13, and external air enters the first protective cover 13 through the diversion air holes 18.

[0041] When the cooling fans 17 at both ends of the second protective cover 14 operate, the external air is input into the second protective cover 14, a positive pressure is formed inside the second protective cover 14, and the air inside the second protective cover 14 is discharged through the diversion air holes 18.

[0042] Referring Figure 3 , the winding 3 includes a high-voltage coil arranged on the outside and a low-voltage coil arranged on the inside. There are heat dissipation gaps 21 reserved between the high-voltage coil and the low-voltage coil, and between the low-voltage coil and the iron core 2. The diversion 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 diversion 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 diversion effect of the first protective cover 13 and the second protective cover 14, the flow of the air around the iron core 2 and the winding 3 is promoted, achieving the effect of accelerating heat dissipation.

[0043] 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 inside thereof can well promote air flow, playing a role in accelerating the heat dissipation of the iron core 2. Due to the changes in resonance frequency and mechanical stress, the noise will increase as the temperature of the silicon steel sheet rises. 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 temperature rise, meeting the use requirements of heat dissipation and noise reduction.

[0044] In the high-stability transformer proposed by the present invention, an induction ring 19 is arranged in the installation cylinder 15, and a magnetic block 20 is arranged on the counterweight 7. When the iron core 2 vibrates to drive the counterweight 7 to vibrate, the magnetic block 20 is caused to move reciprocally, so that an induced current is generated in the induction coil in the induction ring 19. The induced current is processed by a filtering circuit and an amplifying circuit and then introduced and drives the cooling fan 17 to operate, realizing 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 operates at a high load, the self-vibration frequency of the iron core 2 increases, and the rotation speed of the cooling fan 17 also increases, improving the heat dissipation rate of the transformer. Since the transformer noise mainly includes the noise of the transformer body and the noise of heat dissipation, when the transformer operates at a low load, the rotation speed of the cooling fan 17 also decreases, which can not only meet the heat dissipation requirements at high loads, but also meet the requirements of low heat dissipation noise at low loads.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and 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) is formed by stacking a plurality of silicon steel sheets, a clamping plate assembly is fixedly mounted 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 mounted on the iron core (2); The resonance control 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); 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); A plurality of induction rings (19) are fixedly mounted in the mounting tube (15), a plurality of induction coils are embedded in each of the induction rings (19), and the plurality of induction coils are arranged in a circular array in the induction rings (19), and a magnetic block (20) corresponding to each of the induction coils is embedded in the counterweight block (7).

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: 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).

5. A high stability transformer according to claim 4, characterized in that: The induction coil is electrically connected to the cooling fan (17) via a power filter, and the rotation speed of the cooling fan (17) is controlled by changes in the induced current of the induction coil.

6. A high stability transformer according to claim 5, 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).

7. A high stability transformer according to claim 6, 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).

8. A high stability transformer according to claim 7, 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 low-voltage 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).

Images