CN110957109A - Oil-immersed self-cooling transformer cooling system - Google Patents
Oil-immersed self-cooling transformer cooling system Download PDFInfo
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- CN110957109A CN110957109A CN201911165381.8A CN201911165381A CN110957109A CN 110957109 A CN110957109 A CN 110957109A CN 201911165381 A CN201911165381 A CN 201911165381A CN 110957109 A CN110957109 A CN 110957109A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/18—Liquid cooling by evaporating liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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Abstract
The invention discloses an oil-immersed self-cooling transformer cooling system which comprises a winding temperature monitoring unit, an oil surface temperature monitoring unit, a humidifying unit, an air supply unit and a control module, wherein the control module controls the start and stop of the humidifying unit according to signals of the winding temperature monitoring unit, and controls the start and stop of the air supply unit according to signals of the oil surface temperature monitoring unit. The invention aims to provide a cooling system of an oil-immersed self-cooling transformer, which aims to solve the problems that the oil-immersed self-cooling transformer in the prior art has poor heat dissipation capability and is in a high-temperature alarm state for a long time, and achieve the purposes of reducing the labor consumption and improving the heat dissipation efficiency.
Description
Technical Field
The invention relates to the field of transformer cooling, in particular to an oil-immersed self-cooling transformer cooling system.
Background
According to the heat dissipation principle of the oil-immersed natural air-cooled transformer, the heat dissipation mechanism of the mode is mainly characterized in that the transformer oil close to the iron core and the winding expands under the heating effect when the transformer normally operates through the temperature difference between the inside and the outside of the transformer (the temperature of the part close to the winding and the iron core in the transformer is high, and the temperature of the external environment of the transformer is low) and the specific heat of the transformer oil is larger than that of the transformer oil, so that the transformer oil can timely dissipate the heat through the heat dissipation fins through the up-down convection of the oil. At present, in a power grid system, natural air cooling design is increasingly adopted for the heat dissipation mode of an oil immersed transformer in a transformer substation. When the transformer adopting the heat dissipation mode is high in ambient temperature and heavy in load in summer every year, the heat dissipation capacity of the transformer is limited by the ambient temperature and the load of the transformer, the external ambient temperature is high under the direct sunlight, the heat dissipation capacity is poor, and the upper oil temperature and the winding temperature of the transformer are in a high-temperature alarm state for a long time.
Disclosure of Invention
The invention aims to provide a cooling system of an oil-immersed self-cooling transformer, which aims to solve the problems that the oil-immersed self-cooling transformer in the prior art has poor heat dissipation capability and is in a high-temperature alarm state for a long time, and achieve the purposes of reducing the labor consumption and improving the heat dissipation efficiency.
The invention is realized by the following technical scheme:
the utility model provides an oil-immersed self-cooling transformer cooling system, includes winding temperature monitoring unit, oil level temperature monitoring unit, humidification unit, air supply unit, control module opens and stops according to the signal control humidification unit of winding temperature monitoring unit, control module opens and stops according to the signal control air supply unit of oil level temperature monitoring unit.
Aiming at the problems that the oil immersed self-cooling transformer in the prior art is poor in heat dissipation capability and is in a high-temperature alarm state for a long time, the invention provides a cooling system of the oil immersed self-cooling transformer. Wherein, the humidifying unit and the air supply unit are arranged around the transformer according to the requirements of site environment and the actual site conditions, and are started when the temperature rises to the set temperature and stopped when the temperature drops to the set temperature. This application can effectively avoid current oily formula self-cooling transformer to be in high temperature alarm state for a long time, increases the ambient temperature through the humidification unit, reduces transformer ambient temperature through the air supply unit, makes transformer oil effectively utilize upper and lower difference in temperature and inside and outside difference in temperature, makes transformer oil circulate with higher speed between transformer inside and fin, in time gives off the external world through the fin with the heat in the transformer.
Furthermore, the winding temperature monitoring unit and the oil surface temperature monitoring unit are respectively a winding temperature controller and an oil surface temperature controller of the oil immersed self-cooling transformer. The existing winding temperature controller of this scheme utilization transformer, oil level temperature controller are as monitoring module, concatenate humidification unit, air supply unit respectively with it and realize start-up, the stop control to humidification, air supply, can very practice thrift the cost for this system transformation input is lower, is favorable to on a large scale reforming promotion to current power station.
Furthermore, the control module comprises two groups of control units which respectively control the starting and stopping of the humidifying unit and the air supply unit; the control unit comprises a relay, a contactor and a phase sequence protector which are sequentially connected. The control unit controls the starting and stopping of the corresponding humidifying unit and the air supply unit through the received temperature signal, and the control unit can be realized by all the technicians in the field. The control unit preferably uses a PLC programmable logic controller.
Furthermore, the starting and stopping of the humidifying unit respectively correspond to the temperature A, B monitored by the winding temperature monitoring unit; the start and stop of the air supply unit respectively correspond to the temperature C, D monitored by the oil surface temperature monitoring unit; wherein A > C > B > D. The scheme limits the relation between the starting temperature and the stopping temperature of the humidifying unit and the air supply unit, and particularly comprises the following steps: when the temperature rises to C, the air supply unit is started; when the temperature is reduced to D, the air supply unit stops; when the temperature rises to A, the humidifying unit is started; when the temperature is reduced to B, the humidifying unit is stopped. The starting temperature of the humidification unit is higher than that of the air supply unit, because the specific heat capacity of the transformer oil is large, although the heat absorption effect is good, the heat dissipation and cooling process is slow, the air supply unit is started to reduce the ambient temperature of the transformer at a lower temperature C, the air supply unit is stopped at a lower temperature D, the transformer oil is more efficiently dissipated, and the transformer oil is matched with the characteristic of high specific heat capacity of the transformer oil, so that the heat absorbed by the transformer oil from the transformer body is stably discharged. The humidifying unit is mainly used for increasing the humidity of air around the transformer, so that the temperature is reduced by utilizing a water evaporation heat absorption principle, the starting temperature of the humidifying unit is higher than that of the air supply unit, the stopping temperature of the humidifying unit is also higher than that of the air supply unit, the air supply unit firstly and continuously accelerates the air flow around the transformer, the moist and hot air around the transformer is firstly blown away, the air around the transformer is relatively dry at the moment, if the temperature of the transformer is continuously increased under the independent action of the air supply unit until the temperature of the winding temperature monitoring unit reaches A, the humidifying unit starts to work at the moment, the humidity of the air around the transformer is immediately close to saturation in a spraying or water spraying mode, the original high-temperature dry air heat is immediately absorbed by the sprayed water mist, the water mist is gasified to consume a large amount of heat, and in the process, the air supply unit continuously works, so that the gasified, the new water mist continuously absorbs heat, so that the temperature of the transformer is rapidly reduced from a higher point A. When the temperature of the transformer is reduced to the point B, the transformer is separated from a high-temperature alarm danger area, the humidifying unit is stopped at the moment, the air supply unit continues to slowly control the temperature, and the water resource consumption is reduced. The specific working process of the scheme is as follows: the transformer starts to work, the temperature gradually rises, when the temperature rises to C, the air supply unit starts to work, and if the temperature starts to fall, the air supply unit stops working when the temperature falls to D; if the temperature is maintained between A and D, the air supply unit is kept working; if the temperature is continuously increased to A, the humidifying unit also starts to work, meanwhile, the air supply unit keeps working, the temperature of the transformer inevitably starts to be reduced, when the temperature is reduced to B, the humidifying unit stops working, the air supply unit continues to work, and if the temperature is continuously reduced to D, the air supply unit also stops working. In a word, in the scheme, when the temperatures monitored by the winding temperature monitoring unit and the oil surface temperature monitoring unit are in a rising state, the temperature rises to a point C to start the air supply unit, and rises to a point A to start the humidification unit; when the temperatures monitored by the winding temperature monitoring unit and the oil surface temperature monitoring unit are in a descending state, the temperature is reduced to a point B, the humidifying unit is closed, and the temperature is reduced to a point D, and the air supply unit is closed.
Furthermore, a plurality of humidifying units and air supply units are arranged around the transformer, and each air supply unit is matched with one humidifying unit; the air supply unit is positioned at one side of the corresponding humidifying unit far away from the direction of the radiating fin of the transformer. The air supply unit and the humidifying unit form a cooling group together, the air supply unit is farther away from the transformer in each cooling group, the humidifying unit is closer to the transformer, and air sent by the air supply unit can reach the transformer through the humidifying unit, so that when the air supply unit and the humidifying unit work together, water mist can be directly sent to the surface of the transformer through the air supply unit, the scattering of cooling water to surrounding air is reduced, and the utilization rate of the cooling water is obviously improved.
Furthermore, the connecting line between each air supply unit and the corresponding humidifying unit is perpendicular to the connecting line between the radiating fins. The air blown out by the air supply unit and the water mist sent out by the humidifying unit can enter gaps between two adjacent radiating fins more, so that the radiating efficiency is improved, and the utilization efficiency of the air supply unit and the humidifying unit is improved.
Further, the humidification unit includes the inlet tube, the air supply unit includes the intake pipe, the inlet tube inserts to the intake pipe in from the intake pipe lateral wall to wear out from the exit end of intake pipe, still including rotating the carousel of establishing on the inlet tube, the carousel is supported and is held up at the exit end of intake pipe, set up on the carousel with the passageway of intake pipe intercommunication still includes the wind-gathering mouth with the passageway intercommunication. The humidifying unit and the air supply unit in the scheme form an integral structure, and the flow area of air can be firstly reduced, the air spraying speed is increased, and the heat dissipation effect is improved through the higher air flow speed by the aid of the water inlet pipe arranged in the air inlet pipe; secondly, the space volume of the whole heat dissipation system is reduced, the exposed part is reduced, the damage risk is reduced, and meanwhile the consistent spraying direction of air and water mist is ensured. In this scheme, the inlet tube is worn out from the exit end of intake pipe, therefore the exit end of inlet tube compares the exit end of intake pipe and is closer to the transformer. The carousel is established to the setting rotation cover that is close to the intake pipe exit end on the inlet tube, and the carousel can rotate around the intake pipe, through the passageway on the carousel, realizes the intercommunication with the intake pipe, and the air gets into the passageway from the intake pipe, and the passageway on the follow carousel gets into and gathers the wind gap, further accelerates the speed of spun air through gathering the wind gap, further improves the radiating effect. Through rotating the carousel in this scheme, can follow circumference fine setting air blowout position to make this structure setting when the top of transformer, below or side, can adjust air blowout position as required in a flexible way, make the air spout from the position that is closer to the transformer, show the use flexibility that improves this application.
Furthermore, a sealing ring is fixedly sleeved at one end of the air inlet pipe adjacent to the turntable. Effective sealing between the air inlet pipe and the rotary disc is ensured.
Preferably, the rotary disc is rotatably connected with the water inlet pipe through a bearing.
Furthermore, the device also comprises a driving mechanism for driving the turntable to rotate. The driving mechanism can realize the accurate adjustment of the rotating angle of the turntable, thereby realizing the accurate control of the air spraying direction.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the cooling system of the oil-immersed self-cooling transformer can effectively prevent the existing oil-immersed self-cooling transformer from being in a high-temperature alarm state for a long time, increase the ambient humidity through the humidifying unit, and reduce the ambient temperature of the transformer through the air supply unit, so that the transformer oil effectively utilizes the upper and lower temperature difference and the inner and outer temperature difference, the transformer oil is accelerated to circulate between the inside of the transformer and the radiating fins, and the heat in the transformer is timely radiated to the outside through the radiating fins.
2. The oil immersed self-cooling transformer cooling system provided by the invention utilizes the existing winding temperature controller and oil surface temperature controller of the transformer as monitoring modules, and the existing winding temperature controller and oil surface temperature controller are respectively connected in series into the humidifying unit and the air supply unit to realize the start and stop control of humidification and air supply, so that the cost can be greatly saved, the system is low in modification investment, and the large-scale modification and popularization of the existing power station are facilitated.
3. The oil-immersed self-cooling transformer cooling system is beneficial to more efficiently dissipating heat of transformer oil, and stably discharges heat absorbed by the transformer oil from a transformer body by matching with the characteristic of high specific heat capacity of the transformer oil.
4. The oil-immersed self-cooling transformer cooling system can finely adjust the air spraying position along the circumferential direction, so that the air spraying position can be flexibly adjusted as required when the structure is arranged above, below or on the side surface of a transformer, air is sprayed from the position closer to the transformer, and the use flexibility of the oil-immersed self-cooling transformer cooling system is obviously improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a system in accordance with an embodiment of the present invention;
FIG. 2 is a plan view of a field layout of an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the humidifying unit and the air supply unit in an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1-water inlet pipe, 2-air inlet pipe, 3-rotary table, 4-channel, 5-air gathering port, 6-sealing ring, 7-motor, 8-belt, 9-transformer host, 10-radiator, 11-radiating fin, 12-winding temperature controller, 13-oil surface temperature controller, 14-humidifying unit and 15-air supply unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
the oil-immersed self-cooling transformer cooling system shown in fig. 1 and 2 is characterized by comprising a winding temperature monitoring unit, an oil surface temperature monitoring unit, a humidifying unit, an air supply unit and a control module, wherein the control module controls the start and stop of the humidifying unit according to a signal of the winding temperature monitoring unit, and the control module controls the start and stop of the air supply unit according to a signal of the oil surface temperature monitoring unit. And the winding temperature monitoring unit and the oil surface temperature monitoring unit are respectively a winding temperature controller and an oil surface temperature controller of the oil immersed self-cooling transformer.
Preferably, the control module comprises two groups of control units, and the two groups of control units respectively control the starting and stopping of the humidifying unit and the air supply unit; the control unit comprises a relay, a contactor and a phase sequence protector which are sequentially connected.
Example 2:
as shown in fig. 1 and fig. 2, in embodiment 1, an oil-immersed self-cooling transformer cooling system is provided:
the starting and stopping of the humidifying unit respectively correspond to the temperature A, B monitored by the winding temperature monitoring unit;
the start and stop of the air supply unit respectively correspond to the temperature C, D monitored by the oil surface temperature monitoring unit;
wherein A > C > B > D.
A plurality of humidifying units and air supply units are arranged around the transformer, and each air supply unit is matched with one humidifying unit; the air supply unit is positioned at one side of the corresponding humidifying unit far away from the direction of the radiating fin of the transformer. The connecting line between each air supply unit and the corresponding humidifying unit is vertical to the connecting line between the radiating fins.
In the embodiment, when the temperatures monitored by the winding temperature monitoring unit and the oil surface temperature monitoring unit are in a rising state, the temperature rises to a point C to start the air supply unit, and rises to a point A to start the humidifying unit; when the temperatures monitored by the winding temperature monitoring unit and the oil surface temperature monitoring unit are in a descending state, the temperature is reduced to a point B, the humidifying unit is closed, and the temperature is reduced to a point D, and the air supply unit is closed.
Wherein the temperature A, B, C, D may be in units of degrees Celsius or degrees Fahrenheit.
In this embodiment, the temperature A, B, C, D is 85 deg.C, 70 deg.C, 75 deg.C, and 60 deg.C, respectively.
Of course, the starting and stopping temperature set values of the winding temperature controller and the oil level temperature controller can be set according to the climate conditions of the transformer. Particularly, the selection of the air volume of the fan in the air supply unit and the selection of the water spray flow in the humidification module should be combined with the comprehensive consideration of the transformer capacity, the number of radiators, original design data and the like.
The cooling method comprises the following steps:
s1, starting working of a transformer, gradually raising the temperature, and starting working of an air supply unit when the temperature is raised to C;
s2, if the temperature starts to be reduced, stopping the work of the air supply unit when the temperature is reduced to D; if the temperature is maintained between A and D, the air supply unit is kept working; if the temperature continues to rise to A, the humidifying unit also starts to work, meanwhile, the air supply unit continues to work, the temperature of the transformer starts to decrease, and the process enters S3;
s3, when the temperature is reduced to B, stopping the work of the humidifying unit and the work of the air supply unit, and returning to the step S2 to judge the temperature change; if the temperature continues to decrease to D, the blower unit also stops operating, and the operation returns to S1 to stand by before the transformer starts operating.
The embodiment obtains a success test in the oil-immersed self-cooling transformer with the field voltage level of 35kV to 220kV, and can be used for oil-immersed self-cooling transformers with more voltage levels, so that the practicability is high.
Example 3:
an oil-immersed self-cooling transformer cooling system as shown in fig. 1 to fig. 3 is based on any one of the above embodiments: the humidification unit includes inlet tube 1, the air supply unit includes intake pipe 2, inlet tube 1 inserts to intake pipe 2 in from 2 lateral walls in the intake pipe to wear out from the exit end of intake pipe 2, still including rotating the cover and establishing carousel 3 on inlet tube 1, carousel 3 is supported and is held together at the exit end of intake pipe 2, set up on carousel 3 with the passageway 4 of intake pipe 2 intercommunication still includes the wind gap 5 that gathers with passageway 4 intercommunication. And a sealing ring 6 is fixedly sleeved at one end of the air inlet pipe 2 adjacent to the turntable 3. The rotary disc 3 is rotatably connected with the water inlet pipe 1 through a bearing. The device also comprises a driving mechanism for driving the turntable 3 to rotate.
In this embodiment, the driving mechanism is composed of a motor 7 and a belt 8, and the motor 7 drives the turntable 3 to rotate through the belt 8. Preferably, the motor 7 is a servo motor or a stepping motor.
The embodiment fully utilizes the existing winding temperature controller and oil surface temperature controller of the oil immersed self-cooling transformer as monitoring modules, which are the design core of the invention, realizes the maximum utilization of the existing resources and improves the utilization rate of equipment;
the air supply module in the design of the invention is designed with the air gathering port, thereby realizing the centralized air quantity and the longer effective distance; the height and the direction are adjustable, so that the dynamic adjustment of any angle and height according to the actual height of the on-site radiator is convenient, and the flexibility is high; the cooling measure and the humidifying measure are skillfully combined, the surrounding environment of the oil immersed self-cooling transformer is improved by resultant force, and the advantages of a self-cooling heat dissipation mode are fully exerted.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The oil-immersed self-cooling transformer cooling system is characterized by comprising a winding temperature monitoring unit, an oil surface temperature monitoring unit, a humidifying unit, an air supply unit and a control module, wherein the control module controls the start and stop of the humidifying unit according to signals of the winding temperature monitoring unit, and the control module controls the start and stop of the air supply unit according to signals of the oil surface temperature monitoring unit.
2. The oil-immersed self-cooling transformer cooling system according to claim 1, wherein the winding temperature monitoring unit and the oil level temperature monitoring unit are a winding temperature controller and an oil level temperature controller of the oil-immersed self-cooling transformer, respectively.
3. The oil-immersed self-cooling transformer cooling system according to claim 1, wherein the control module comprises two groups of control units, and the two groups of control units respectively control the start and stop of the humidifying unit and the air supply unit; the control unit comprises a relay, a contactor and a phase sequence protector which are sequentially connected.
4. The oil-immersed self-cooling transformer cooling system according to claim 1,
the starting and stopping of the humidifying unit respectively correspond to the temperature A, B monitored by the winding temperature monitoring unit;
the start and stop of the air supply unit respectively correspond to the temperature C, D monitored by the oil surface temperature monitoring unit;
wherein A > C > B > D.
5. The oil-immersed self-cooling transformer cooling system according to claim 4, wherein a plurality of humidification units and air supply units are arranged around the transformer, and each air supply unit is matched with one humidification unit; the air supply unit is positioned at one side of the corresponding humidifying unit far away from the direction of the radiating fin of the transformer.
6. The oil-immersed self-cooling transformer cooling system according to claim 5, wherein the connection line between each air supply unit and the corresponding humidification unit is perpendicular to the connection line between the cooling fins.
7. The oil-immersed self-cooling transformer cooling system according to claim 1, wherein the humidifying unit comprises an inlet pipe (1), the air supply unit comprises an inlet pipe (2), the inlet pipe (1) is inserted into the inlet pipe (2) from the side wall of the inlet pipe (2) and penetrates out from the outlet end of the inlet pipe (2), the cooling system further comprises a rotary table (3) which is rotatably sleeved on the inlet pipe (1), the rotary table (3) is abutted to the outlet end of the inlet pipe (2), a channel (4) communicated with the inlet pipe (2) is arranged on the rotary table (3), and the cooling system further comprises an air gathering port (5) communicated with the channel (4).
8. The oil immersed self-cooling transformer cooling system according to claim 7, wherein a sealing ring (6) is fixedly sleeved at one end of the air inlet pipe (2) adjacent to the turntable (3).
9. The oil-immersed self-cooling transformer cooling system according to claim 7, wherein the rotary plate (3) is rotatably connected with the water inlet pipe (1) through a bearing.
10. The oil-immersed self-cooling transformer cooling system according to claim 7, further comprising a driving mechanism for driving the turntable (3) to rotate.
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| CN201911165381.8A CN110957109A (en) | 2019-11-25 | 2019-11-25 | Oil-immersed self-cooling transformer cooling system |
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