CN113284705A - Photovoltaic wind-powered electricity generation duplex winding split dry-type transformer - Google Patents
Photovoltaic wind-powered electricity generation duplex winding split dry-type transformer Download PDFInfo
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- CN113284705A CN113284705A CN202110613249.XA CN202110613249A CN113284705A CN 113284705 A CN113284705 A CN 113284705A CN 202110613249 A CN202110613249 A CN 202110613249A CN 113284705 A CN113284705 A CN 113284705A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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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
- H01F27/02—Casings
- H01F27/025—Constructional details relating to cooling
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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
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
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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
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Abstract
The invention discloses a photovoltaic wind power double-winding split dry-type transformer. In the invention, the interior of the middle mounting plate is connected with a hinge seat in a sliding manner, and the tail end of the hinge seat is rotationally connected with a rotating shaft; the heat-conducting copper column is welded on the inner wall of the top of the heat-discharging box, the tail end of the bottom of the heat-conducting copper column is rotatably connected with the rotary heat-conducting disc, a fixing frame is welded at the center of the inner wall of the top of the heat-discharging box, a rotary motor is fixedly installed below the fixing frame, and a fan is fixedly installed on the heat-discharging box; the fan can be taken the heat to the inside of heat extraction case from the inside of outer box, and rotating electrical machines drives this moment and revolves the heat conduction dish and rotate together to revolve the heat conduction dish and can fully contact with the heat, with the outside fin of heat conduction, discharge the heat via the fin at last, thereby guaranteed that the inside heat of outer box can not be too high, ensured that the transformer body can normal operating, improved the stability of this transformer.
Description
Technical Field
The invention belongs to the technical field of transformer production, and particularly relates to a photovoltaic wind power double-winding split dry-type transformer.
Background
Dry-type transformers are widely used in local lighting, high-rise buildings, airports, wharf CNC machines and other places, and simply, dry-type transformers refer to transformers in which iron cores and windings are not immersed in insulating oil. The cooling method is classified into natural air cooling (AN) and forced air cooling (AF). During natural air cooling, the transformer can continuously operate for a long time under the rated capacity. When forced air cooling is carried out, the output capacity of the transformer can be improved by 50 percent. The device is suitable for intermittent overload operation or emergency accident overload operation; because the load loss and the impedance voltage amplification are large during overload and the device is in a non-economic operation state, the device is not required to be in continuous overload operation for a long time; there are two major classes of current dry transformers, one being epoxy type and the other being Nomex paper type. At present, in developed countries such as the United states, Germany and Japan, the yield of the dry-type transformer accounts for more than 20% of the yield of the distribution transformer, and in the transformer substation set, the yield of the dry-type transformer accounts for 80-90%. The '2013 + 2017 China dry type transformer industry market demand forecasting and investment strategy planning analysis report' shows that China has become the world with the largest yield and sales. At present, various foreign high-voltage and low-voltage electrical appliance products occupy important markets in China, and only dry-type transformers are not imported from foreign countries after the end of the 20 th century, so that the dry-type transformers are difficult to find the trails of foreign dry-type transformer changes in key projects and major projects in China. Under the current organization and construction mode of the power transmission network in China, the proportion of 10k V dry-type transformers is increased year by year.
But common transformer is when using, and inside radiating effect is good inadequately for the operating pressure of transformer is great, and the outside of thermovent lacks simultaneously and keeps away the dirt device, makes the inside of transformer get into the dust easily and influence the life-span, and the transformer is unstable inadequately simultaneously, takes place the vibration easily and makes internal damage when receiving the impact.
Disclosure of Invention
The invention aims to: in order to solve the problem, a photovoltaic wind power double-winding split dry-type transformer is provided.
The technical scheme adopted by the invention is as follows: a photovoltaic wind power double-winding split dry-type transformer comprises an outer box body, wherein a heat exhaust box is arranged at the top of the outer box body, a transformer body is arranged on the inner wall of the bottom of the outer box body, an insulating outer plate is sleeved outside the transformer body, a buffering middle-placed base is arranged on the left side of the insulating outer plate, a sliding groove is welded in the middle of the buffering middle-placed base, a middle mounting plate is arranged on the surface of the sliding groove, a hinge seat is slidably connected inside the middle mounting plate, and the tail end of the hinge seat is rotatably connected with a rotating shaft;
the heat-conducting copper column is welded on the inner wall of the top of the heat-discharging box, the tail end of the bottom of the heat-conducting copper column is rotatably connected with the rotary heat-conducting disc, a fixing frame is welded at the center of the inner wall of the top of the heat-discharging box, a rotary motor is fixedly installed below the fixing frame, and a fan is fixedly installed on the heat-discharging box;
the dust-proof box is characterized in that air holes are formed in the left side and the right side of the outer box body, a dust-proof frame is welded to the position, located outside the air holes, of the right side surface of the outer box body, an inserting port is formed in the top of the dust-proof frame, and a dust-proof net is inserted into the inserting port.
In a preferred embodiment, the number of the transformer bodies is two, and the two transformer bodies are symmetrically arranged inside the left side and the right side of the outer box.
In a preferred embodiment, a connecting rod is rotatably connected to the outside of the rotating shaft, and the connecting rod is fixedly connected to the left side surface of the insulating outer plate.
In a preferred embodiment, a side mounting seat is arranged on the right side surface of the insulating outer plate, a limiting rod is connected inside the side mounting seat in a sliding mode, and the limiting rod is fixedly connected with the right side surface of the insulating outer plate.
In a preferred embodiment, the number of the heat-conducting copper columns is two, the two heat-conducting copper columns are symmetrically arranged inside the heat-discharging box, the heat-conducting copper columns penetrate through the inside of the heat-discharging box, the heat-conducting copper columns are located at the tail ends of the outside of the heat-discharging box, cooling fins are welded on the tail ends of the outside of the heat-discharging box, and the cooling fins are copper metal sheets.
In a preferred embodiment, the fan penetrates through the heat-exhausting box and the outer box, and an air inlet is formed at one end of the fan, which is located inside the outer box.
In a preferred embodiment, the dustproof net is welded with an outer frame, the top of the dustproof net is welded with a mounting top plate, and the width of the mounting top plate is 2.0cm longer than that of the socket.
In a preferred embodiment, a main box door is arranged on the front outer part of the outer box body, and the number of the main box doors is two.
In a preferred embodiment, the bottom end of the rotating motor is welded to the upper surface of the rotary heat conducting disc, and the rotary heat conducting disc is located right above the air outlet of the fan.
In a preferred embodiment, the inside of the outer box body is communicated with the outside through the air holes, and the number of the air holes is two and the two air holes are symmetrically arranged on the left side and the right side of the outer box body.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the transformer, when the transformer body works, heat can be generated at the moment, the switch of the fan and the rotating motor is turned on, the fan can draw the heat out of the inner part of the outer box body to the inner part of the heat exhaust box, the rotating motor drives the rotary heat conduction disc to rotate together, so that the rotary heat conduction disc can be in full contact with the heat, the heat is conducted to the external radiating fins, and finally the heat is exhausted through the radiating fins, so that the condition that the heat in the outer box body is not too high is ensured, the normal operation of the transformer body is ensured, and the stability of the transformer is improved.
2. According to the dust-proof net, the dust-proof net is taken out and inserted into the dust-proof frame along the inserting port, so that the outer frame is firmly clamped, and then the dust-proof net can prevent dust in air from entering the air holes to influence mechanical equipment in the outer box body, so that the labor burden of cleaning workers is reduced, and the cleanness of the inner part of the outer box body is guaranteed.
3. According to the invention, when the outer box body is impacted, the transformer body shakes, the rotating shaft in the middle buffering base can rotate with the hinging base, so that the hinging base slides in the sliding groove, the middle buffering base buffers the vibration amplitude, the transformer body is prevented from being easily impacted from the outside, the failure probability of the transformer body is reduced, the stability of the outer box body is enhanced, and the service life of the outer box body is prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a dust screen according to the present invention;
FIG. 3 is a schematic view of the internal structure of the outer case according to the present invention;
FIG. 4 is a schematic view of the internal structure of the middle buffering base according to the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 1 according to the present invention;
FIG. 6 is an enlarged view of FIG. 4 at B.
The labels in the figure are: 1-an outer box body, 2-a dust blocking frame, 3-air holes, 4-radiating fins, 5-a heat conducting copper column, 6-a heat discharging box, 7-a main box door, 8-a mounting top plate, 9-a dust screen, 10-an outer frame, 11-a transformer body, 12-a side mounting seat, 13-an insulating outer plate, 14-a buffer middle base, 15-a rotary heat conducting disc, 16-a fan, 17-a fixing frame, 18-a rotating motor, 19-an air inlet, 20-a socket, 21-a middle mounting plate, 22-a connecting rod, 23-a rotating shaft, 24-a hinge seat and 25-a sliding groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-6, the photovoltaic wind power dual-winding split dry-type transformer comprises an outer box body 1, wherein a main box door 7 is arranged outside the front side of the outer box body 1, and the number of the main box doors 7 is two; the top of the outer box body 1 is provided with a heat exhaust box 6, the inner wall of the bottom of the outer box body 1 is provided with two transformer bodies 11, and the two transformer bodies 11 are symmetrically arranged inside the left side and the right side of the outer box body 1; an insulating outer plate 13 is sleeved outside the transformer body 11, a side mounting seat 12 is arranged on the right side face of the insulating outer plate 13, a limiting rod is connected inside the side mounting seat 12 in a sliding mode, and the limiting rod is fixedly connected with the right side surface of the insulating outer plate 13; a buffer middle base 14 is arranged on the left side of the insulating outer plate 13, a sliding groove 25 is welded in the middle of the buffer middle base 14, a middle mounting plate 21 is arranged on the surface of the sliding groove 25, a hinge seat 24 is slidably connected inside the middle mounting plate 21, and the tail end of the hinge seat 24 is rotatably connected with a rotating shaft 23; a connecting rod 22 is rotatably connected to the outside of the rotating shaft 23, and the connecting rod 22 is fixedly connected with the left side surface of the insulating outer plate 13; when the outer box body 1 is impacted, the transformer body 11 shakes, the rotating shaft 23 inside the buffering middle base 14 rotates with the hinge base 24, so that the hinge base 24 slides inside the sliding groove 25, the buffering middle base 14 buffers the vibration amplitude, the transformer body 11 is prevented from being easily impacted from the outside, the probability of failure of the transformer body 11 is reduced, the stability of the outer box body 1 is enhanced, and the service life of the outer box body 1 is prolonged;
the heat dissipation device is characterized in that heat conduction copper columns 5 are welded on the inner wall of the top of the heat dissipation box 6, the number of the heat conduction copper columns 5 is two, the two heat conduction copper columns are symmetrically arranged inside the heat dissipation box 6, the heat conduction copper columns 5 penetrate through the inside of the heat dissipation box 6, the heat dissipation fins 4 are welded at the tail ends, located outside the heat dissipation box 6, of the heat conduction copper columns 5, and the heat dissipation fins 4 are copper metal sheets; the bottom tail end of the heat conducting copper column 5 is rotatably connected with a rotary heat conducting disc 15, a fixed frame 17 is welded at the center of the inner wall of the top of the heat exhaust box 6, a rotary motor 18 is fixedly installed below the fixed frame 17, the bottom tail end of the rotary motor 18 is welded with the upper surface of the rotary heat conducting disc 15, and the rotary heat conducting disc 15 is positioned right above an air outlet of the fan 16; a fan 16 is fixedly arranged on the heat exhaust box 6; the fan 16 penetrates through the heat exhaust box 6 and the inner part of the outer box 1, and an air inlet 19 is formed in one end, located inside the outer box 1, of the fan 16; when the transformer body 11 works, heat is generated at the moment, a switch of the fan 16 and the rotating motor 18 is turned on, the fan 16 can draw the heat out from the inside of the outer box body 1 to the inside of the heat exhaust box 6 at the moment, the rotating motor 18 drives the rotary heat transfer disc 15 to rotate together, so that the rotary heat transfer disc 15 can be fully contacted with the heat and transfers the heat to the external radiating fins 4, and finally the heat is exhausted through the radiating fins 4, so that the internal heat of the outer box body 1 is not overhigh, the normal operation of the transformer body 11 is ensured, and the stability of the outer box body 1 is improved;
the left side and the right side of the outer box body 1 are provided with air holes 3, the inside and the outside of the outer box body 1 are communicated through the air holes 3, and the two air holes 3 are symmetrically arranged on the left side and the right side of the outer box body 1; a dust blocking frame 2 is welded on the right side surface of the outer box body 1 at the position outside the air holes 3, an inserting port 20 is formed in the top of the dust blocking frame 2, a dustproof net 9 is inserted into the inserting port 20, an outer frame 10 is welded on the dustproof net 9, an installation top plate 8 is welded on the top of the dustproof net 9, and the width of the installation top plate 8 is 2.0cm longer than that of the inserting port 20; get the dust screen 9, insert the inside that hinders dirt frame 2 with dust screen 9 along interface 20 for frame 10 joint is firm, and later dust screen 9 just can prevent that the dust in the air from entering into the inside of bleeder vent 3, causes the influence to the inside machine equipment of outer box 1, thereby has alleviateed the work burden of staff's clearance, has also guaranteed the inside cleanliness factor of outer box 1.
The working principle is as follows: when the photovoltaic wind power double-winding split dry-type transformer is used, when the transformer body 11 works, heat can be generated at the moment, switches of the fan 16 and the rotating motor 18 are turned on, at the moment, the fan 16 can extract the heat from the inside of the outer box body 1 to the inside of the heat extraction box 6, at the moment, the rotating motor 18 drives the rotating heat transfer disc 15 to rotate together, so that the rotating heat transfer disc 15 can be fully contacted with the heat and conduct the heat to the external radiating fins 4, and finally the heat is exhausted through the radiating fins 4, so that the condition that the internal heat of the outer box body 1 is not too high is ensured, the normal operation of the transformer body 11 is ensured, and the stability of the outer box body 1 is improved; when the outer box body 1 is impacted, the transformer body 11 shakes, the rotating shaft 23 inside the buffering middle base 14 rotates with the hinge base 24, so that the hinge base 24 slides inside the sliding groove 25, the buffering middle base 14 buffers the vibration amplitude, the transformer body 11 is prevented from being easily impacted from the outside, the probability of failure of the transformer body 11 is reduced, the stability of the outer box body 1 is enhanced, and the service life of the outer box body 1 is prolonged; get the dust screen 9, insert the inside that hinders dirt frame 2 with dust screen 9 along interface 20 for frame 10 joint is firm, and later dust screen 9 just can prevent that the dust in the air from entering into the inside of bleeder vent 3, causes the influence to the inside machine equipment of outer box 1, thereby has alleviateed the work burden of staff's clearance, has also guaranteed the inside cleanliness factor of outer box 1.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a photovoltaic wind-powered electricity generation duplex winding split dry-type transformer, includes outer box (1), its characterized in that: the transformer box is characterized in that a heat exhaust box (6) is arranged at the top of the outer box body (1), a transformer body (11) is arranged on the inner wall of the bottom of the outer box body (1), an insulating outer plate (13) is sleeved outside the transformer body (11), a buffering middle base (14) is arranged on the left side of the insulating outer plate (13), a sliding groove (25) is welded in the middle of the buffering middle base (14), a middle mounting plate (21) is arranged on the surface of the sliding groove (25), a hinge seat (24) is connected inside the middle mounting plate (21) in a sliding mode, and the tail end of the hinge seat (24) is rotatably connected with a rotating shaft (23);
the heat-conducting copper column (5) is welded on the inner wall of the top of the heat-discharging box (6), the tail end of the bottom of the heat-conducting copper column (5) is rotatably connected with a rotary heat-conducting disc (15), a fixing frame (17) is welded at the center of the inner wall of the top of the heat-discharging box (6), a rotating motor (18) is fixedly installed below the fixing frame (17), and a fan (16) is fixedly installed on the heat-discharging box (6);
the dustproof box is characterized in that air holes (3) are formed in the left side and the right side of the outer box body (1), the right side surface of the outer box body (1) is located on the outer portion of the air holes (3) and welded with a dust blocking frame (2), an insertion port (20) is formed in the top of the dust blocking frame (2), and a dustproof net (9) is inserted into the insertion port (20).
2. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the transformer comprises two transformer bodies (11), wherein the two transformer bodies (11) are symmetrically arranged inside the left side and the right side of the outer box body (1).
3. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the outside of axis of rotation (23) is rotated and is connected with connecting rod (22), connecting rod (22) with the left surface fixed connection of insulating planking (13).
4. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the right side face of insulating planking (13) is provided with side mount pad (12), the inside sliding connection of side mount pad (12) has the gag lever post, and the gag lever post with the right side fixed surface of insulating planking (13) is connected.
5. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the quantity of heat conduction copper post (5) is two, and the symmetry sets up the inside of heat removal case (6), heat conduction copper post (5) run through the inside of heat removal case (6), heat conduction copper post (5) are located the outside end welding of heat removal case (6) has fin (4), fin (4) are copper sheetmetal.
6. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the fan (16) penetrates through the heat exhaust box (6) and the inner part of the outer box body (1), and an air inlet (19) is formed in one end, located inside the outer box body (1), of the fan (16).
7. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the welding of dust screen (9) has frame (10), the top welding of dust screen (9) has installation roof (8), the width of installation roof (8) is than the width of interface (20) is long 2.0 cm.
8. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the outer box is characterized in that a main box door (7) is arranged outside the front face of the outer box body (1), and the number of the main box doors (7) is two.
9. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the bottom tail end of the rotating motor (18) is welded with the upper surface of the rotary heat transfer disc (15), and the rotary heat transfer disc (15) is located right above an air outlet of the fan (16).
10. The photovoltaic wind power bifilar split dry transformer of claim 1, wherein: the inner part and the outer part of the outer box body (1) are communicated through the air holes (3), the number of the air holes (3) is two, and the air holes are symmetrically arranged on the left side and the right side of the outer box body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110613249.XA CN113284705A (en) | 2021-06-02 | 2021-06-02 | Photovoltaic wind-powered electricity generation duplex winding split dry-type transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110613249.XA CN113284705A (en) | 2021-06-02 | 2021-06-02 | Photovoltaic wind-powered electricity generation duplex winding split dry-type transformer |
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| CN113284705A true CN113284705A (en) | 2021-08-20 |
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| CN202110613249.XA Pending CN113284705A (en) | 2021-06-02 | 2021-06-02 | Photovoltaic wind-powered electricity generation duplex winding split dry-type transformer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3308170A1 (en) * | 1982-03-09 | 1983-09-22 | Smit Transformatoren B.V., 6500 Nijmegen | High-power transformer with compressed-air cooling |
| US20120234520A1 (en) * | 2011-03-17 | 2012-09-20 | Hamilton Sundstrand Corporation | Transformer assembly with enhanced air cooling |
| CN108831692A (en) * | 2018-06-21 | 2018-11-16 | 徐州帆新能源科技有限公司 | A kind of remote-controlled low pressure lithium battery energy storage battery control system |
| CN209249253U (en) * | 2019-03-12 | 2019-08-13 | 深圳市图之宏电子科技有限公司 | A kind of structure that cools of new dry-type transformer |
| CN110911090A (en) * | 2019-12-02 | 2020-03-24 | 衢州学院 | Disaster protection device for special transformer and installation method thereof |
| CN212486398U (en) * | 2020-06-29 | 2021-02-05 | 深圳华辰源科技有限公司 | Heat-dissipation insulated high-voltage power supply equipment |
| CN213124050U (en) * | 2020-10-20 | 2021-05-04 | 天津高捷联冠电气有限公司 | Dry-type transformer |
-
2021
- 2021-06-02 CN CN202110613249.XA patent/CN113284705A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3308170A1 (en) * | 1982-03-09 | 1983-09-22 | Smit Transformatoren B.V., 6500 Nijmegen | High-power transformer with compressed-air cooling |
| US20120234520A1 (en) * | 2011-03-17 | 2012-09-20 | Hamilton Sundstrand Corporation | Transformer assembly with enhanced air cooling |
| CN108831692A (en) * | 2018-06-21 | 2018-11-16 | 徐州帆新能源科技有限公司 | A kind of remote-controlled low pressure lithium battery energy storage battery control system |
| CN209249253U (en) * | 2019-03-12 | 2019-08-13 | 深圳市图之宏电子科技有限公司 | A kind of structure that cools of new dry-type transformer |
| CN110911090A (en) * | 2019-12-02 | 2020-03-24 | 衢州学院 | Disaster protection device for special transformer and installation method thereof |
| CN212486398U (en) * | 2020-06-29 | 2021-02-05 | 深圳华辰源科技有限公司 | Heat-dissipation insulated high-voltage power supply equipment |
| CN213124050U (en) * | 2020-10-20 | 2021-05-04 | 天津高捷联冠电气有限公司 | Dry-type transformer |
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Application publication date: 20210820 |
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