Dry-type transformer capable of dissipating heat through multi-stage cooling

Abstract

The invention discloses a dry-type transformer capable of dissipating heat through multi-stage cooling, and belongs to the technical field of dry-type transformers, the dry-type transformer comprises a transformer body and a cooling mechanism, the transformer body is composed of a plurality of transformer wire groups, the cooling mechanism sleeves the outer surface of the transformer body, and the cooling mechanism is composed of the following structures: a cooling fan arranged below the transformer wire groups, the cooling fan extends along the edge of the bottom of the transformer wire set, an airflow outlet is formed in the top of the cooling fan, a baffle supporting rod extending upwards along the surface of the transformer wire set is arranged at the top of the cooling fan, and a plurality of airflow baffles obliquely extending upwards in the length direction are hinged to the baffle supporting rod through spring hinges. One ends of the airflow baffles in the width direction are movably connected with the spring hinges; the positions of the airflow baffles between the adjacent baffle supporting rods are staggered in the vertical direction; the transformer body is subjected to multi-stage cooling heat dissipation through the cooling mechanism, and the cooling efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of dry-type transformers, and in particular to a dry-type transformer that dissipates heat through multi-stage cooling. Background Art

[0002] As an important equipment in the power system, the stable operation of dry-type transformers is crucial to the normal operation of the power system. Dry-type transformers generate heat during operation. If they are not cooled and dissipated in time, the service life and performance of the dry-type transformers will be affected and even fire will be caused. In order to ensure the safe and stable operation of dry-type transformers, dry-type transformers usually need to have good cooling and heat dissipation capabilities. Natural air cooling and forced air cooling are usually used to cool dry-type transformers. Most dry-type transformers will be equipped with cooling fans under the line group to ensure that forced air cooling can be performed when necessary. However, the cooling fans of most dry-type transformers only form airflow vertically upward to dissipate heat for the line group, and the airflow takes away the heat around the line group to promote the cooling of the line group. Only part of the airflow will contact the surface of the line group, and the other part of the airflow is less efficient in taking away the heat in the line group. The actual cooling efficiency of the cooling fan for the dry-type transformer is not ideal, and improving the heat dissipation performance of the dry-type transformer is usually simply to increase the power of the cooling fan, and to take away more heat by forming a larger airflow, which cannot improve the cooling efficiency.

[0003] Based on the above situation, a Chinese patent with announcement number CN112530666A discloses a high heat dissipation dry-type transformer, including a transformer box, a transformer body fixedly arranged in the transformer box, an air inlet arranged at the upper end of the transformer box, an air outlet arranged at the bottom of the transformer box, a cold air device arranged at the air inlet, and a mounting device arranged on the transformer box for fixing the cold air device, wherein the cold air device includes a cover, a water tank fixedly arranged on the cover, a water spray assembly rotatably arranged on the water tank, a first water retaining ring fixedly arranged in the water tank, a bellows fixedly arranged on the water tank, and an inlet arranged on the bellows. An air pipe, a driving shaft rotatably arranged at one end at the center of the bellows, a first motor for driving the driving shaft to rotate, a fan fixedly sleeved on the driving shaft, an air distribution component rotatably arranged in a cover shell, a first conical plate rotatably sleeved on the driving shaft and fixedly arranged in the cover shell, a plurality of conical holes equidistantly annularly distributed on the first conical plate, an air-water separation component arranged in the cover shell below the first conical plate, a water pump fixedly arranged on a transformer box, a refrigerator fixedly arranged on the water pump and connected to the water pump, a first connecting pipe for connecting the refrigerator and a water tank, and a second connecting pipe for connecting the water pump and the air-water separation component.

[0004] The dry-type transformer disclosed in the above patent improves the heat dissipation effect of cooling air on the dry-type transformer by arranging a cooling air device on the top that can reduce cooling air. The low-temperature cooling air is transported into the transformer box through the air inlet to cool the transformer body, but part of the cooling air cannot contact the transformer body. These cooling air usually only carry a small amount of heat and are discharged from the transformer box, resulting in low efficiency of cooling air in taking away heat, thereby affecting the cooling efficiency of the cooling air on the transformer body. Therefore, the dry-type transformer still has room for improvement. Summary of the invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes a dry-type transformer with multi-stage cooling and heat dissipation, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: A dry-type transformer that dissipates heat through multi-stage cooling, comprising a transformer body and a cooling mechanism, wherein the transformer body is composed of a plurality of transformer wire groups, the cooling mechanism is sleeved on the outer surface of the transformer body, and the cooling mechanism is composed of the following structures: a cooling fan is arranged below the transformer wire group, the cooling fan extends along the bottom edge of the transformer wire group, an air flow outlet is opened on the top of the cooling fan, a baffle support rod extending upward along the surface of the transformer wire group is arranged on the top of the cooling fan, the baffle support rod is hinged with a plurality of air flow baffles extending upward in a length direction by a spring hinge, one end of the air flow baffle in the width direction is movably connected to the spring hinge, and the positions of the air flow baffles between adjacent baffle support rods are staggered in the vertical direction.

[0006] As a further technical solution of the present invention, the extended end of the airflow baffle is close to the spring hinge of another adjacent airflow baffle, and several airflow baffles with two ends close to each other jointly form an airflow guide plate, and a guide channel is jointly formed between two adjacent airflow guide plates.

[0007] As a further technical solution of the present invention, the baffle support rod is composed of a first support rod and a second support rod, and the first support rod and the second support rod are alternately arranged along the extension direction of the cooling fan, and the airflow baffles between adjacent first support rods are successively terminated and approached to form a number of airflow guide plates, and the airflow baffles between adjacent second support rods are successively terminated and approached to form a number of airflow guide plates.

[0008] As a further technical solution of the present invention, the plurality of airflow guide plates formed by the first support rod and the plurality of airflow guide plates formed by the second support rod are arranged alternately.

[0009] As a further technical solution of the present invention, the angles between the airflow baffles in the first support rod and the second support rod and the horizontal plane are both a, wherein 20°≤a≤45°.

[0010] As a further technical solution of the present invention, the airflow baffles between adjacent baffle support rods are successively terminated and approached to form a plurality of airflow guide plates together, and the angle between the airflow baffle and the horizontal plane is b, wherein 45°≤b≤70°.

[0011] As a further technical solution of the present invention, one end of the spring hinge extends toward the axis of the transformer winding group, and the other end extends obliquely downward.

[0012] As a further technical solution of the present invention, two cooling fans are provided under each transformer wire group, and the cooling fans extend from one side of the transformer wire group to the other side.

[0013] As a further technical solution of the present invention, a supporting bracket is mounted outside the transformer body, a low-voltage transformer is provided at the low-voltage end of the transformer body and a high-voltage transformer is provided at the high-voltage end of the transformer body and fixedly connected to the supporting bracket.

[0014] The beneficial effects of the present invention are: The present invention uses a cooling fan to generate an upward airflow to perform forced air cooling on the transformer body. During the movement, the airflow moves upward obliquely and extends the movement path under the guidance of the airflow baffle. The airflow baffle can also cut the airflow to form a number of small airflows, and make the small airflows collide with each other to form vortices and fully contact with the surface of the transformer wire group, thereby improving the cooling efficiency of the cooling mechanism for the transformer body. In addition, an airflow with a larger flow rate and flow rate can cause the airflow baffle to swing and change the flow path of the small airflow, and at the same time can intensify the collision between the small airflows to better form vortices, thereby improving the cooling effect and cooling efficiency of the airflow on the transformer body. Airflow baffles at different angles enable the cooling mechanism to produce different cooling effects on the transformer body, and multi-stage cooling and heat dissipation is achieved when the transformer wire group is at different temperatures, so that the airflow can always take away the heat in the transformer wire group with high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a structural schematic diagram of a first embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0016] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle.

[0017] Figure 3 The invention is a schematic diagram of the expansion of the cooling mechanism of the first embodiment of a dry-type transformer which dissipates heat through multi-stage cooling.

[0018] Figure 4 The present invention is a schematic diagram of the airflow direction of a first embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0019] Figure 5 The present invention is a schematic diagram of the expansion of the cooling mechanism of the second embodiment of a dry-type transformer which dissipates heat through multi-stage cooling.

[0020] Figure 6 The present invention is a schematic diagram of the airflow direction of a second embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0021] Figure 7 The present invention is a schematic structural diagram of a third embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0022] Figure 8 yes Figure 7 A partial schematic diagram of point B in the middle.

[0023] Fig. 9 The present invention is a schematic diagram of the expansion of the cooling mechanism of the third embodiment of a dry-type transformer which dissipates heat through multi-stage cooling.

[0024] Fig.10 The present invention is a schematic diagram of the airflow direction of a third embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0025] Fig.11 The present invention is a schematic structural diagram of a fourth embodiment of a dry-type transformer that dissipates heat through multi-stage cooling.

[0026] Among them: 1-transformer body, 11-transformer line group, 12-low voltage transformer, 13-high voltage transformer, 2-cooling mechanism, 21-cooling fan, 22-air flow outlet, 23-baffle support rod, 231-first support rod, 232-second support rod, 24-spring hinge, 25-air flow baffle, 3-air flow guide plate, 4-guide channel, 5-support bracket. DETAILED DESCRIPTION

[0027] The implementation modes of the present invention are described below in conjunction with relevant drawings and embodiments. The implementation modes of the present invention are not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0028] like Figure 1 , 2As shown, a dry-type transformer that dissipates heat through multi-stage cooling includes a transformer body 1 and a cooling mechanism 2. The transformer body 1 is composed of a plurality of transformer wire groups 11. The cooling mechanism 2 is sleeved on the outer surface of the transformer body 1. The cooling mechanism 2 is composed of the following structures: a cooling fan 21 is arranged below the transformer wire group 11, the cooling fan 21 extends along the bottom edge of the transformer wire group 11, an air flow outlet 22 is opened on the top of the cooling fan 21, a baffle support rod 23 extending upward along the surface of the transformer wire group 11 is provided on the top of the cooling fan 21, the baffle support rod 23 is hinged with a plurality of air flow baffles 25 extending upward obliquely in the length direction by a spring hinge 24, one end of the air flow baffle 25 in the width direction is movably connected to the spring hinge 24, and the positions of the air flow baffles 25 between adjacent baffle support rods 23 are staggered in the vertical direction.

[0029] The dry-type transformer of the present invention realizes multi-stage heat dissipation through the cooling mechanism 2, thereby improving the defect of low cooling efficiency of the cooling air in the current dry-type transformer. In the transformer body 1, the transformer winding group 11 is composed of common components such as the iron core, the high-voltage winding, the low-voltage winding, and the neutral line winding. A thermocouple probe is provided on the top of the transformer winding group 11. The thermocouple probe can detect the temperature inside the transformer winding group 11. The servo system adjusts the operating state of the cooling fan 21 through common components such as the frequency converter according to the temperature detected by the thermocouple probe, so that the cooling mechanism 2 can achieve different cooling effects. Specifically, when the thermocouple probe detects that the transformer body 1 is in operation, the temperature of the transformer winding group 11 is detected by the thermocouple probe. When the internal temperature of the transformer winding group 11 rises to a certain temperature, the cooling fan 21 starts to work and generates an airflow moving upward along the surface of the transformer winding group 11 at the airflow outlet 22, so as to perform forced air cooling on the transformer winding group 11. The airflow contacts the airflow baffle 25 during the upward movement and moves upward obliquely under the guidance of the airflow baffle 25. The airflow generated by the cooling fan 21 is divided into a plurality of small airflows moving upward obliquely by a plurality of airflow baffles 25. The paths of these small airflows moving along the surface of the transformer winding group 11 per unit time are longer, so as to take away more heat in the transformer winding group 11, thereby improving the cooling efficiency of the airflow on the transformer body 1.

[0030] It should be further explained that, as a first preferred embodiment of the present invention, Figure 3 , 4As shown, combined with the unfolding schematic diagram of the cooling mechanism 2 of the present invention and the schematic diagram of the airflow direction, the figure is obtained after the cooling mechanism 2 is unfolded along a straight line, and the airflow direction refers to the arrow direction in the figure. When the airflow is divided into small airflows by the airflow baffle 25, the small airflow moves from the spring hinge 24 of the airflow baffle 25 along the lower surface of the airflow baffle 25 toward the top. At this time, the movement direction of the small airflow and the angle between the length direction of the airflow baffle 25 and the horizontal plane are the same. When the small airflow moves to the top of the airflow baffle 25, part of the small airflow continues to move in the original direction under the action of inertia, and the other part of the small airflow continues to move in the original direction under the action of inertia. Part of the small airflow will move upward in a direction forming a larger angle with the horizontal plane. This part of the small airflow is easy to collide with another small airflow above to generate a turbulence effect, thereby causing the small airflow to form a swirl. Each small airflow divided by the airflow baffle 25 can form a swirl under the above-mentioned turbulence effect. The small airflow after forming the swirl has a longer movement path per unit time, so that the small airflow can fully contact the surface of the transformer wire group 11, thereby increasing the heat taken away by the small airflow from the transformer wire group 11, and then the cooling mechanism 2 has a higher cooling efficiency for the transformer body 1.

[0031] It should be further explained that the smaller the angle between the airflow baffle 25 and the horizontal plane, the longer the time required for the airflow to move from the bottom to the top of the transformer winding group 11. This is usually suitable for the situation where the internal temperature of the transformer winding group 11 is moderate but forced air cooling is required to maintain normal operation. As the load increases or other factors cause the internal temperature of the transformer winding group 11 to rise during the operation of the transformer body 1, when the airflow moves to a position close to the top of the transformer winding group 11, it already carries a lot of heat and cannot meet the cooling and heat dissipation of the top of the transformer winding group 11. It is usually necessary to increase the motion power of the cooling fan 21, increase the flow rate and flow rate of the generated airflow, and take away more heat.

[0032] As a second preferred embodiment of the present invention, Figure 5 , 6As shown, combined with the unfolding schematic diagram of the cooling mechanism 2 of the present invention and the schematic diagram of the airflow direction, the figure is obtained after the cooling mechanism 2 is unfolded along a straight line, and the airflow direction refers to the direction of the arrow in the figure. Since the airflow generated by the cooling fan 21 will exert an upward force on the airflow baffle 25 from the bottom, and the airflow baffle 25 is movably connected to the baffle support rod 23 through the spring hinge 24, the greater the flow rate and flow velocity of the airflow, the greater the force on the airflow baffle 25. When the force exceeds the elastic force of the spring inside the spring hinge 24 that causes the minimum deformation, the airflow baffle 25 will swing, so that the angle between the airflow baffle 25 and the horizontal plane increases. The time required for the airflow to move from the bottom to the top of the transformer winding group 11 will be shortened, which is beneficial to avoid the airflow being unable to meet the cooling and heat dissipation at the top of the transformer winding group 11, and improving the cooling effect of the cooling mechanism 2 on the overall transformer winding group. At the same time, after the small airflow divided by the airflow baffle 25 moves to the top of the airflow baffle 25, a larger part of the small airflow will move upward in a direction forming a larger angle with the horizontal plane, which is beneficial to intensify the collision between the small airflows and better form a swirl of the airflow, so that the airflow can more fully contact the surface of the transformer winding group 11, further improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0033] In summary, the present invention generates an upward airflow through the cooling fan 21 to force air cooling on the transformer body 1. During the movement, the airflow moves upward at an angle and extends the movement path under the guidance of the airflow baffle 25. The airflow baffle 25 can also cut the airflow to form a number of small airflows, and make the small airflows collide with each other to form a vortex and fully contact the surface of the transformer wire group 11, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1. In addition, an airflow with a larger flow rate and flow rate can cause the airflow baffle 25 to swing and change the flow path of the small airflow, and at the same time can intensify the collision between the small airflows to better form a vortex, thereby improving the cooling effect and cooling efficiency of the airflow on the transformer body 1. The airflow baffles 25 at different angles enable the cooling mechanism 2 to produce different cooling effects on the transformer body 1, and realize multi-stage cooling and heat dissipation when the transformer wire group 11 is at different temperatures, so that the airflow can always take away the heat in the transformer wire group 11 with a higher efficiency.

[0034] As one of the preferred embodiments of the present invention, Figure 1-4As shown, the extended end of the air flow baffle 25 is close to the spring hinge 24 of another adjacent air flow baffle 25, and a plurality of air flow baffles 25 with two ends close to each other jointly form an air flow guide plate 3, and a guide channel 4 is jointly formed between two adjacent air flow guide plates 3; the air flow guide plate 3 is composed of a plurality of air flow baffles 25 that are close to each other end to end in sequence, and the air flow guide plate 3 and the air flow baffle 25 have the same inclination angle. The air flow generated by the cooling fan 21 will be separated by the air flow guide plate 3 to form a plurality of air flows moving along the guide channel 4. During the movement of the air flow, part of the air flow will be diverted from between two adjacent air flow baffles 25 to the adjacent guide channel 4. The air flow is formed into a vortex through the mutual collision between the air flows, so that the air flow can be more fully in contact with the surface of the transformer line group 11, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0035] After adopting the above structure, it needs to be further explained that, if Figure 3 , 4 As shown, the baffle support rod 23 is composed of a first support rod 231 and a second support rod 232, and the first support rod 231 and the second support rod 232 are alternately arranged along the extension direction of the cooling fan 21, and the airflow baffles 25 between adjacent first support rods 231 are successively closed and close to form a plurality of airflow guide plates 3, and the airflow baffles 25 between adjacent second support rods 232 are successively closed and close to form a plurality of airflow guide plates 3; a plurality of airflow baffles 25 in a plurality of first support rods 231 can form a plurality of airflow guide plates 3 based on the sequential head-to-tail closeness of the airflow baffles 25, and similarly, a plurality of second support rods 232 The several air flow baffles 25 in the cooling mechanism 2 can also form several air flow guide plates 3 based on the sequential end-to-end proximity of the air flow baffles 25. Since the first support rod 231 and the second support rod 232 are alternately arranged, the guide channel 4 in the cooling mechanism 2 in this state is relatively long, so that most of the air flow moves along a fixed path. The path and time of the air flow moving along the guide channel 4 are relatively long, and the air flow can fully contact the surface of the transformer winding group 11. It is suitable for the transformer winding group 11 with a moderate internal temperature but requiring forced air cooling for cooling, so that the cooling fan 21 can produce a higher cooling effect with a lower operating power.

[0036] After adopting the above structure, it needs to be further explained that, if Figure 3 , 4 As shown, a plurality of airflow guide plates 3 formed by the first support rod 231 and a plurality of airflow guide plates 3 formed by the second support rod 232 are alternately arranged; since the airflow will be closer to the bottom of the airflow baffle 25 during movement, the use of this structure can form more guide channels 4 between the airflow guide plates 3, so that the airflow is divided into more portions of airflow and the width of the airflow during movement is reduced, thereby avoiding excessive concentration of the airflow and affecting its cooling efficiency for the transformer line group 11.

[0037] After adopting the above structure, it needs to be further explained that, if Figure 3 , 4 As shown, the angles between the air flow baffle 25 and the horizontal plane in the first support rod 231 and the second support rod 232 are both a, wherein 20°≤a≤45°; the angle a between the air flow baffle 25 and the horizontal plane is preferably 30°, at which time the air flow baffle 25 is in a non-swinging state, and the angle between the air flow baffle 25 and the horizontal plane is relatively low, which is conducive to extending the air flow guide plate 3 at a lower angle and increasing its extended length, and the path and time of the air flow moving along the guide channel 4 are both relatively long, and the air flow can fully contact the surface of the transformer winding group 11, which is suitable for the transformer winding group 11 with a moderate internal temperature but requiring forced air cooling for cooling, so that the cooling fan 21 can produce a higher cooling effect with a lower operating power.

[0038] It should be noted that if Figure 5 , 6 As shown, as the movement power of the cooling fan 21 increases, the flow rate and flow velocity of the airflow it generates are increased, and the airflow baffle 25 swings along the spring hinge 24 under the action of the airflow impact force, so that the angle between the airflow baffle 25 and the horizontal plane becomes larger. As the swing angle of the airflow baffle 25 becomes larger and larger, it is difficult for the airflow baffles 25 to approach each other end to end to form the airflow guide plate 3 and the guide channel 4. The airflow will be divided into several small airflows by the airflow baffle 25. These small airflows can also form vortices by colliding with each other. The corresponding principle has been fully explained in the previous text, and this situation will not be repeated here.

[0039] As a third preferred embodiment of the present invention, Figure 7-10 As shown, the air flow baffles 25 between the adjacent baffle support rods 23 are successively closed and close to form a plurality of air flow guide plates 3, and the angle between the air flow baffle 25 and the horizontal plane is b, wherein 45°≤b≤70°; the angle a between the air flow baffle 25 and the horizontal plane is preferably 60°, at which time, the air flow baffle 25 is at the maximum swing amplitude along the spring hinge 24, and the plurality of air flow baffles 25 are re-formed into a plurality of air flow guide plates 3 by being close to each other end to end, and the number of air flow guide plates 3 formed is twice that when the angle is a, and at the same time, the cooling fan 21 is at a higher or highest motion power, and the air flow direction is as shown in the attached Fig.10 In the direction of the middle arrow, the path and time of the airflow moving along the guide channel 4 are both short. In this case, the cooling mechanism 2 is suitable for cooling and dissipating the transformer winding group 11 with a relatively high internal temperature. It can be seen that the airflow baffles 25 at different angles enable the cooling mechanism 2 to produce different cooling effects on the transformer body 1, and multi-stage cooling and dissipation is achieved when the transformer winding group 11 is at different temperatures, so that the airflow can always take away the heat in the transformer winding group 11 with a relatively high efficiency.

[0040] As one of the preferred embodiments of the present invention, one end of the spring hinge 24 extends toward the axis of the transformer winding group 11, and the other end extends obliquely downward. The spring hinge 24 with this structure makes one end of the air flow baffle 25 in the width direction obliquely upward toward the transformer winding group. After the air flow generated by the cooling fan 21 contacts the air flow baffle 25, it can move obliquely toward the surface of the transformer winding group 11, which is conducive to better forming a swirl of the air flow and can reduce the flow rate of the air flow escaping from the cooling mechanism 2, thereby improving the cooling efficiency of the cooling mechanism 2 on the transformer body 1.

[0041] As one of the preferred embodiments of the present invention, Figure 1 As shown, two cooling fans 21 are provided under each transformer winding group 11. The cooling fans 21 extend from one side of the transformer winding group 11 to the other side. The outer shell of the cooling fan 21 is semicircular in shape, and the cooling fan 21 extends along the bottom edge of the transformer winding group 11. The two cooling fans 21 provided under the transformer winding group 11 can better generate airflow that completely wraps the surface of the transformer winding group 11, which is beneficial to improving the cooling effect of the cooling mechanism 2 on the transformer body.

[0042] As a fourth preferred embodiment of the present invention, Fig.11 As shown, a support bracket 5 is provided on the outside of the transformer body 1, a low-voltage transformer 12 fixedly connected to the support bracket 5 is provided at the low-voltage end of the transformer body 1, and a high-voltage transformer 13 fixedly connected to the support bracket 5 is provided at the high-voltage end of the transformer body 1; the support bracket 5 is mainly used to support and fix components such as the transformer line group 11, the cooling fan 21, the low-voltage transformer 12, and the high-voltage transformer 13. The low-voltage transformer 12 is preferably a low-voltage current transformer, and the high-voltage transformer 13 is preferably a high-voltage current transformer. The current transformer can measure the current at the low-voltage end or the high-voltage end of the transformer body 1, and can also accurately measure and monitor the current, so as to timely discover potential faults in the power system and provide important data for monitoring and dispatching of the power system. When the transformer is overloaded or short-circuited, the current transformer can quickly sense the current abnormality and trigger the protection device to cut off the fault current, thereby protecting the transformer body 1 from damage. The current transformer provides current protection for the transformer by accurately measuring and monitoring the current, which is beneficial to improving the stability of the power system.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dry-type transformer that dissipates heat through multi-stage cooling, comprising a transformer body (1) and a cooling mechanism (2), characterized in that: The transformer body (1) is composed of a plurality of transformer windings (11); the cooling mechanism (2) is sleeved on the outer surface of the transformer body (1); the cooling mechanism (2) is composed of the following structures: a cooling fan (21) is arranged below the transformer windings (11); the cooling fan (21) extends along the bottom edge of the transformer windings (11); an air flow outlet (22) is provided at the top of the cooling fan (21); a baffle support rod (23) extending upward along the surface of the transformer windings (11) is provided at the top of the cooling fan (21); the baffle support rod (23) is hinged with a plurality of air flow baffles (25) extending upward in a length direction by means of a spring hinge (24); one end of the air flow baffle (25) in a width direction is movably connected to the spring hinge (24); and the positions of the air flow baffles (25) between adjacent baffle support rods (23) are staggered in a vertical direction.

2. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 1, characterized in that: The extended end of the airflow baffle (25) is close to the spring hinge (24) of another adjacent airflow baffle (25), and a plurality of airflow baffles (25) whose two ends are close to each other jointly form an airflow guide plate (3), and a guide channel (4) is jointly formed between two adjacent airflow guide plates (3).

3. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 2, characterized in that: The baffle support rod (23) is composed of a first support rod (231) and a second support rod (232), and the first support rod (231) and the second support rod (232) are alternately arranged along the extension direction of the cooling fan (21), and the airflow baffles (25) between adjacent first support rods (231) are successively terminated and approached to form a plurality of airflow guide plates (3), and the airflow baffles (25) between adjacent second support rods (232) are successively terminated and approached to form a plurality of airflow guide plates (3).

4. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 3, characterized in that: The plurality of airflow guide plates (3) formed by the first support rod (231) and the plurality of airflow guide plates (3) formed by the second support rod (232) are arranged alternately.

5. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 3, characterized in that: The included angles between the airflow baffles (25) in the first support rod (231) and the second support rod (232) and the horizontal plane are both a, where 20°≤a≤45°.

6. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 2, characterized in that: The airflow baffles (25) between adjacent baffle support rods (23) are successively terminated and approached to form a plurality of airflow guide plates (3) together, and the angle between the airflow baffles (25) and the horizontal plane is b, wherein 45°≤b≤70°.

7. The dry-type transformer for dissipating heat through multi-stage cooling according to claim 1, characterized in that: One end of the spring hinge (24) extends toward the axis of the transformer line group (11), and the other end extends obliquely downward.

8. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 1, characterized in that: Two cooling fans (21) are provided below each transformer wire group (11), and the cooling fans (21) extend from one side of the transformer wire group (11) to the other side.

9. The dry-type transformer for heat dissipation by multi-stage cooling according to claim 1, characterized in that: A support bracket (5) is provided outside the transformer body (1), a low-voltage transformer (12) fixedly connected to the support bracket (5) is provided at the low-voltage end of the transformer body (1), and a high-voltage transformer (13) fixedly connected to the support bracket (5) is provided at the high-voltage end of the transformer body (1).

Images