CN110993295A - A three-phase transformer with low-voltage winding single-phase external conversion device - Google Patents
A three-phase transformer with low-voltage winding single-phase external conversion device Download PDFInfo
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- CN110993295A CN110993295A CN201911290268.2A CN201911290268A CN110993295A CN 110993295 A CN110993295 A CN 110993295A CN 201911290268 A CN201911290268 A CN 201911290268A CN 110993295 A CN110993295 A CN 110993295A
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- 238000004804 winding Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 23
- 230000001846 repelling effect Effects 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000284 resting effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 230000002940 repellent Effects 0.000 description 6
- 239000005871 repellent Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M29/00—Scaring or repelling devices, e.g. bird-scaring apparatus
- A01M29/30—Scaring or repelling devices, e.g. bird-scaring apparatus preventing or obstructing access or passage, e.g. by means of barriers, spikes, cords, obstacles or sprinkled water
- A01M29/32—Scaring or repelling devices, e.g. bird-scaring apparatus preventing or obstructing access or passage, e.g. by means of barriers, spikes, cords, obstacles or sprinkled water specially adapted for birds, e.g. spikes
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Birds (AREA)
- Insects & Arthropods (AREA)
- Pest Control & Pesticides (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention provides a three-phase transformer with a low-voltage winding single-three-phase external conversion device. The three-phase transformer with the low-voltage winding single three-phase external conversion device comprises: a three-phase transformer; and the supporting component is fixedly connected to the front side of the three-phase transformer. According to the three-phase transformer with the low-voltage winding single-three-phase external conversion device, the bird repelling component is arranged on one side of the three-phase transformer, the bird repelling component can prevent birds from resting and nesting on the three-phase transformer when working, electric shock of the birds is avoided, the three-phase transformer can be protected from working normally, meanwhile, the bird repelling component is provided with the power supply component, the solar panel provides power for the bird repeller, the solar panel reasonably utilizes light energy, resources are saved, the bird repelling component can be taken down from the supporting component when workers overhaul, the time of the workers is saved, the bird repelling component can be taken down and can be cleaned conveniently, and the effect of the bird repelling component cannot be affected.
Description
Technical Field
The invention relates to the field of three-phase transformers, in particular to a three-phase transformer with a low-voltage winding single three-phase external conversion device.
Background
The transformer is a device for transforming alternating voltage, current and impedance, when alternating current flows in a primary coil, alternating magnetic flux is generated in an iron core (or a magnetic core), so that voltage (or current) is induced in a secondary coil, along with the continuous development of the transformer industry, more and more industries and enterprises apply the transformer, more and more enterprises enter the transformer industry, the transformer consists of the iron core (or the magnetic core) and coils, the coils are provided with two or more windings, wherein the windings connected with a power supply are called the primary coil, and the other windings are called the secondary coil.
Because the existing transformer is generally arranged in the external environment, birds are easy to stay on the transformer in the external environment, the birds stay on the transformer and can nest on the transformer, the birds stay in the nesting and can get an electric shock, once the birds get an electric shock, the transformer is damaged, the electricity is used for life of people, and the birds die, so that the survival of the birds is influenced.
Therefore, it is necessary to provide a three-phase transformer with a low-voltage winding single three-phase external conversion device to solve the above technical problems.
Disclosure of Invention
The invention provides a three-phase transformer with a low-voltage winding single-three-phase external conversion device, which solves the problem of transformer damage caused by electric shock in a bird staying process.
In order to solve the above technical problem, the present invention provides a three-phase transformer with a low-voltage winding single three-phase external converter, comprising: a three-phase transformer;
the supporting component is fixedly connected to the front side of the three-phase transformer;
the bird repelling assembly is arranged at the top of the supporting assembly;
the fixing plate is fixedly connected to the front side of the three-phase transformer;
and the power supply assembly is fixedly connected to the top of the fixing plate.
Install the three-phase transformer behind outdoor fixed position at the staff, fix the one side at the three-phase transformer with supporting component again, then alright will drive bird subassembly and install on supporting component, when the staff overhauls the three-phase transformer, can drive bird subassembly and take off from the supporting component, can not exert an influence to staff's work, it is also convenient clean driving bird subassembly, the bird effect of driving bird subassembly can not descend to guarantee to drive bird, it can prevent birds from stopping on the three-phase transformer to drive bird subassembly simultaneously, lead to the three-phase transformer to damage after the electric shock, power supply assembly on the fixed plate can provide electric power for driving bird subassembly, effectively utilize light energy, the rational utilization of light energy.
Preferably, the supporting component comprises a supporting plate, a limiting groove is formed in one side of the top of the supporting plate, a clamping groove is communicated with one side of the inner surface of the limiting groove, a sliding plate is connected to the inside of the clamping groove in a sliding mode, a sliding rod is fixedly connected to one side of the sliding plate, and one end of the sliding rod penetrates through the supporting plate and extends to the outside of the supporting plate.
Preferably, one end of the sliding rod is fixedly connected with a pressing plate, and a first spring is fixedly connected between the pressing plate and the supporting plate and positioned on the surface of the sliding rod.
Preferably, the bird repelling assembly comprises a limiting block, the limiting block is arranged in the limiting groove, a telescopic groove is formed in the limiting block, a second spring is arranged in the telescopic groove, and a clamping block is fixedly connected to one end of the second spring.
Preferably, one end of the clamping block penetrates through the limiting block and extends to the inside of the clamping groove, and the top of the limiting block is fixedly connected with a bird repeller.
Preferably, the power supply assembly comprises a first support rod, a connecting rod is arranged inside the first support rod, and the top end of the connecting rod is rotatably connected with a solar panel.
Preferably, one side of the bottom of the solar panel is rotatably connected with a second supporting rod, and the bottom end of the second supporting rod is fixedly connected with the top of the fixing plate.
Compared with the related art, the three-phase transformer with the low-voltage winding single three-phase external conversion device has the following beneficial effects:
the invention provides a three-phase transformer with a low-voltage winding single-three-phase external conversion device, wherein a bird repelling component is arranged on one side of the three-phase transformer, the bird repelling component can prevent birds from resting and nesting on the three-phase transformer, electric shock of the birds is avoided, the three-phase transformer can be protected from working normally, meanwhile, the bird repelling component is provided with a power supply component, the solar panel provides a power supply for a bird repeller, the solar panel reasonably utilizes light energy, resources are saved, the inclination angle of the solar panel can be adjusted, and the light energy can be received more effectively.
Drawings
Fig. 1 is a schematic structural diagram of a three-phase transformer with a low-voltage winding single-three-phase external conversion device according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of the support assembly and bird repelling assembly shown in fig. 1;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic structural diagram of the power supply assembly shown in FIG. 1;
FIG. 5 is a schematic structural diagram of a low-voltage winding single-three phase external converter;
fig. 6 is a schematic structural view of the three-phase transformer with the low-voltage winding single three-phase external switching device shown in fig. 5;
FIG. 7 is a schematic diagram of the switch state;
fig. 8 is a schematic diagram of the switch state shown in fig. 7.
Reference numbers in the figures: 1. the three-phase transformer, 2, support group price, 201, backup pad, 202, spacing groove, 203, draw-in groove, 204, slide, 205, slide bar, 206, pressing plate, 207, first spring, 3, drive bird subassembly, 301, spacing block, 302, flexible groove, 303, second spring, 304, fixture block, 305, drive bird ware, 4, fixed plate, 5 power supply unit spare, 501, first bracing piece, 502, connecting rod, 503, solar panel, 504, second bracing piece.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8 in combination, wherein fig. 1 is a schematic structural diagram of a three-phase transformer with a low-voltage winding single three-phase external converting device according to a preferred embodiment of the present invention; fig. 2 is a schematic structural view of the support assembly and bird repelling assembly shown in fig. 1; FIG. 3 is an enlarged view of portion A of FIG. 2; FIG. 4 is a schematic structural diagram of the power supply assembly shown in FIG. 1; FIG. 5 is a schematic structural diagram of a low-voltage winding single-three phase external converter; fig. 6 is a schematic structural view of the three-phase transformer with the low-voltage winding single three-phase external switching device shown in fig. 5; FIG. 7 is a schematic diagram of the switch state; fig. 8 is a schematic diagram of the switch state shown in fig. 7. A three-phase transformer with a low-voltage winding single three-phase external switching device includes: a three-phase transformer 1;
the supporting component 2 is fixedly connected to the front side of the three-phase transformer 1;
the bird repelling component 3 is arranged at the top of the supporting component 2;
the fixing plate 4 is fixedly connected to the front surface of the three-phase transformer 1;
and the power supply assembly 5 is fixedly connected to the top of the fixing plate 4.
The three-phase transformer 1 is widely applied to circuits with alternating current of 50Hz to 60Hz and voltage below 660V, and is widely applied to import important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifying devices, illumination and the like, various input and output voltages of products, connection groups, the number and positions (generally +/-5%) of taps are adjusted, the distribution of winding capacity, the allocation of secondary single-phase windings, the application of rectifying circuits, whether shells are required to be arranged or not and the like, can be elaborately designed and manufactured according to the requirements of users, the supporting component 2 can provide support for the bird repelling component 3, the bird repelling component 3 can repel birds away to prevent the three-phase transformer 1 from being damaged after the birds get an electric shock, and the power supply component 5 can provide required electric power for the bird repelling component 3.
The supporting component 2 comprises a supporting plate 201, a limiting groove 202 is formed in one side of the top of the supporting plate 201, a clamping groove 203 is communicated with one side of the inner surface of the limiting groove 202, a sliding plate 204 is connected to the inside of the clamping groove 203 in a sliding mode, a sliding rod 205 is fixedly connected to one side of the sliding plate 204, and one end of the sliding rod 205 penetrates through the supporting plate 201 and extends to the outside of the supporting plate 201.
The supporting plate 201 is a rectangular plate, the limiting groove 202 is a groove matched with the limiting block 301, the clamping groove 203 is matched with the clamping block 304, and the sliding plate 204 is also matched with the clamping groove 203.
One end of the slide bar 205 is fixedly connected with a pressing plate 206, and a first spring 207 is fixedly connected between the pressing plate 206 and the supporting plate 201 and positioned on the surface of the slide bar 205.
When pressing the pressing plate 206, slide 204 extrudes fixture block 304 out of draw-in groove 203, first spring 207 can be with through pressing the pressing plate 206 slide 204 on the slide bar 205 rebound initial position, first spring 207 is compression spring, compression spring is the coil spring who bears axial pressure, and the material cross-section that it used is mostly circular, also has rectangle and stranded steel winding, and the spring generally is the equidistant, and compression spring's shape has: cylindrical, conical, convex and concave and a few non-circular etc., there is certain clearance between the circle of compression spring, and the spring contracts when receiving external load and warp, stores the deformation energy.
The bird repelling assembly 3 comprises a limiting block 301, the limiting block 301 is arranged inside the limiting groove 202, a telescopic groove 302 is formed inside the limiting block 301, a second spring 303 is arranged inside the telescopic groove 302, and a clamping block 304 is fixedly connected to one end of the second spring 303.
The second spring 303 is a compression spring like the first spring 207, and one surface of the latch 304 is curved to reduce friction with the wall of the stopper groove 202.
One end of the clamping block 304 penetrates through the limiting block 301 and extends into the clamping groove 203, and the top of the limiting block 301 is fixedly connected with a bird repeller 305.
The bird repeller 305 is used for repelling birds staying on the three-phase transformer 1, and is also called bird repelling, bird preventing, bird collision preventing and the like, and in a broad sense, all means for preventing harmful birds from invading the territory of a farm, an orchard, a wind power plant, a military and civil airport and the like so as to harm the labor achievement or the equipment safety of the bird repeller are called bird repelling; in narrow sense, the term of bird repelling refers to all means such as auditory scaring, visual frightening, direct killing, chemical, ecological or radar early warning and the like for preventing birds from invading in key flight areas of airports, especially runways or taxiways for taking off and landing airplanes, in order to protect the taking off and landing safety of aircrafts and prevent the birds from being sucked into airplane engines or impacting airplane bodies such as airplane bodies, landing gears, empennages, windshields and the like when the airplanes take off and land at high speed.
The power supply assembly 5 comprises a first support rod 501, a connecting rod 502 is arranged inside the first support rod 501, and a solar panel 503 is rotatably connected to the top end of the connecting rod 502.
The lengths of the first support rod 501 and the connecting rod 502 are adjustable, so that the inclination angle of the solar panel 503 is adjustable, the solar panel 503 can receive sunlight to the maximum extent, the solar panel 503 is also called a solar cell module, a plurality of solar cells are assembled according to an assembly part, which is a core part in a solar power generation system and is also the most important part in the solar power generation system, the solar cell is also called a solar chip or a photocell, and is a photoelectric semiconductor slice which directly generates power by using sunlight, the single solar cell cannot be directly used as a power supply, and a plurality of single solar cells are required to be connected in series, in parallel and tightly packaged into a module as the power supply.
One side of the bottom of the solar panel 503 is rotatably connected with a second support rod 504, and the bottom end of the second support rod 504 is fixedly connected with the top of the fixing plate 4.
The first support bar 501 and the second support bar 504 are fixed to the fixed plate 4 by bolts.
The device is used for a single-three phase external conversion device of a low-voltage winding of a three-phase transformer, is a novel single-three phase external conversion tool, aims at the single-three phase external conversion of the low-voltage winding of the three-phase power transformer, and relates to the device, three phases and neutral points of the low-voltage winding are connected into the device, a pneumatic disconnecting link can be automatically controlled at a far end, the functions of single-three phase switching and short-circuit low-voltage b-phase magnetic flux are realized, the test time is reduced, the energy is saved, the consumption is reduced, and the potential safety hazard of operators falling; the structure is simple, the operation is convenient, the safety and the reliability are realized, and the method is suitable for the single-three phase external conversion range of the low-voltage winding of the three-phase transformer.
The working principle of the three-phase transformer with the low-voltage winding single three-phase external conversion device is as follows: s1, after the worker installs the three-phase transformer 1 at an external designated position, the support plate 201 is fixed at one side of the three-phase transformer 1 through bolts, after the support plate 201 is fixed and stable, the limit block 301 is placed in the limit groove 202, when the three-phase transformer is placed, the fixture block 304 extrudes the second spring 303 into the telescopic groove 302, the edge of the fixture block 304 extrudes into the limit groove 202 through the edge of the limit groove 202, when the fixture block 304 moves to the position of the clamp groove 203, the second spring 303 ejects the fixture block 304 into the clamp groove 203, the bird repeller 305 is fixed and stable, meanwhile, the worker fixes the fixing plate 4 on the three-phase transformer 1, then the power supply assembly 5 is installed on the fixing plate 4, the solar panel 503 converts received solar energy into electric energy and stores the electric energy, and the bird repeller 305 is connected with a storage battery on the solar panel 503 through a.
S2, when a worker overhauls the three-phase transformer 1 in the future, the worker firstly cuts off the power supply of the power supply component 5 and the bird repeller 305, then manually presses the pressing plate 206, the pressing plate 206 drives the sliding plate 204 through the sliding rod 205 to extrude the clamping block 304 out of the clamping groove 203, when the clamping block 304 leaves the clamping groove 203, the bird repeller 3 can be taken down, the bird repeller 305 rotates to influence the work of the worker when the worker overhauls the three-phase transformer 1, the bird repeller 305 can be polluted by dust when the work of the bird repeller 305 can influence the bird repelling effect, the worker takes the bird repellent component 3 off the supporting component 2, the bird repellent component 3 can be conveniently cleaned by the worker, after the overhaul is completed, the worker installs the bird repellent component 3 back on the supporting component 2, meanwhile, the worker can rotate the connecting rod 502, adjust the lengths of the first supporting rod 501 and the connecting rod 502 to change the angle, so that the solar panel 503 can receive more sufficient light.
Compared with the related art, the three-phase transformer with the low-voltage winding single three-phase external conversion device has the following beneficial effects:
(1) the utility model discloses a bird repellent device, bird repellent component 3 is set up in one side of three-phase transformer 1, bird repellent component 3 work can prevent birds rest and nest on three-phase transformer 1, avoid birds to take place to electrocute, protection three-phase transformer 1 can normally work, it is furnished with power supply module 5 to drive bird component 3 simultaneously, solar panel 503 provides the power for driving bird ware 305, solar panel 503 rational utilization light energy has practiced thrift the resource, and solar panel 503's inclination also can be adjusted, convenient more effectual acceptance light energy.
(2) When the staff overhauls three-phase transformer 1, can will drive bird subassembly 3 and take off from supporting component 2, the convenience of ten minutes has saved staff's time, takes off and drives bird subassembly 3 and also conveniently clean it, makes the effect of driving bird subassembly 3 can not influenced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A three-phase transformer with a low-voltage winding single three-phase external switching device, comprising: a three-phase transformer;
the supporting component is fixedly connected to the front side of the three-phase transformer;
the bird repelling assembly is arranged at the top of the supporting assembly;
the fixing plate is fixedly connected to the front side of the three-phase transformer;
and the power supply assembly is fixedly connected to the top of the fixing plate.
2. The three-phase transformer with the low-voltage winding single-three phase external conversion device according to claim 1, wherein the supporting component comprises a supporting plate, a limiting groove is formed in one side of the top of the supporting plate, a clamping groove is communicated with one side of the inner surface of the limiting groove, a sliding plate is slidably connected inside the clamping groove, a sliding rod is fixedly connected to one side of the sliding plate, and one end of the sliding rod penetrates through the supporting plate and extends to the outside of the supporting plate.
3. The three-phase transformer with the low-voltage winding single-three-phase external conversion device as claimed in claim 2, wherein a pressing plate is fixedly connected to one end of the sliding rod, and a first spring is fixedly connected between the pressing plate and the supporting plate and located on the surface of the sliding rod.
4. The three-phase transformer with the low-voltage winding single-three phase external conversion device according to claim 2, wherein the bird repelling assembly comprises a limiting block, the limiting block is arranged inside the limiting groove, a telescopic groove is formed inside the limiting block, a second spring is arranged inside the telescopic groove, and a clamping block is fixedly connected to one end of the second spring.
5. The three-phase transformer with the low-voltage winding single-three phase external conversion device according to claim 4, wherein one end of the fixture block penetrates through the limiting block and extends into the clamping groove, and a bird repeller is fixedly connected to the top of the limiting block.
6. The three-phase transformer with the low-voltage winding single-three-phase external conversion device according to claim 1, wherein the power supply assembly comprises a first support rod, a connecting rod is arranged inside the first support rod, and a solar panel is rotatably connected to the top end of the connecting rod.
7. The three-phase transformer with the low-voltage winding single-three-phase external conversion device as claimed in claim 6, wherein a second support rod is rotatably connected to one side of the bottom of the solar panel, and the bottom end of the second support rod is fixedly connected to the top of the fixing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290268.2A CN110993295A (en) | 2019-12-16 | 2019-12-16 | A three-phase transformer with low-voltage winding single-phase external conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290268.2A CN110993295A (en) | 2019-12-16 | 2019-12-16 | A three-phase transformer with low-voltage winding single-phase external conversion device |
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| CN110993295A true CN110993295A (en) | 2020-04-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682533A (en) * | 2018-04-19 | 2018-10-19 | 于浩 | A kind of outdoor use transformer with bird dispelling function |
| CN108900749A (en) * | 2018-07-06 | 2018-11-27 | 安徽超清科技股份有限公司 | A kind of intelligent camera based on vehicle feature recognition |
| CN208666711U (en) * | 2018-09-04 | 2019-03-29 | 龙口市丽波绝缘材料有限公司 | A kind of non-woven fabric production line shear structure |
| CN211788593U (en) * | 2019-12-16 | 2020-10-27 | 天威保变(合肥)变压器有限公司 | Three-phase transformer with low-voltage winding single three-phase external conversion device |
-
2019
- 2019-12-16 CN CN201911290268.2A patent/CN110993295A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682533A (en) * | 2018-04-19 | 2018-10-19 | 于浩 | A kind of outdoor use transformer with bird dispelling function |
| CN108900749A (en) * | 2018-07-06 | 2018-11-27 | 安徽超清科技股份有限公司 | A kind of intelligent camera based on vehicle feature recognition |
| CN208666711U (en) * | 2018-09-04 | 2019-03-29 | 龙口市丽波绝缘材料有限公司 | A kind of non-woven fabric production line shear structure |
| CN211788593U (en) * | 2019-12-16 | 2020-10-27 | 天威保变(合肥)变压器有限公司 | Three-phase transformer with low-voltage winding single three-phase external conversion device |
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