CN215527445U - Voltage conversion device for power transformer and power transformer - Google Patents
Voltage conversion device for power transformer and power transformer Download PDFInfo
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- CN215527445U CN215527445U CN202122203694.7U CN202122203694U CN215527445U CN 215527445 U CN215527445 U CN 215527445U CN 202122203694 U CN202122203694 U CN 202122203694U CN 215527445 U CN215527445 U CN 215527445U
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Abstract
The utility model provides a voltage conversion device for a power transformer and the power transformer. The voltage conversion apparatus includes: a first shield electrode connected to a first winding end portion of the power transformer, the first winding end portion being connected to a first winding of the power transformer; a second shield electrode connected to a second winding end portion of the power transformer, the second winding end portion being connected to a second winding of the power transformer; a third shield electrode connected to a lead end of the power transformer, the lead end being connected to a lead of the power transformer; and a switching lever having a first end disposed in the first shielding electrode and a second end configured to be disposed in the second shielding electrode or the third shielding electrode, the output voltage of the power transformer having a first voltage value when the second end of the switching lever is disposed in the second shielding electrode and having a second voltage value when the second end of the switching lever is disposed in the third shielding electrode.
Description
Technical Field
The present invention relates to the field of power systems, and in particular, to a voltage conversion device for a power transformer and a power transformer including the same.
Background
Power transformers are one of the most important power devices in power systems. At present, in order to enable the output voltage of the power transformer to meet the requirements of different substations or different users, an on-load tap changer or an off-load tap changer may be adopted to change the effective number of turns of an output side circuit of the power transformer, so as to change the output voltage of the power transformer. In view of the fact that on-load tap changers are considerably more expensive than no-load tap changers, no-load tap changers are usually used. Voltage conversion arrangements take the example of a three-phase power transformer, where one unloaded tap changer may be used on each phase circuit, thus requiring the use of three unloaded tap changers. The cost of an unloaded tap changer is also high. Furthermore, since the unloaded tap changer is usually assembled in the tank together with other components of the power transformer, the unloaded tap changer is bulky and therefore requires a large assembly space, which results in a bulky power transformer. Accordingly, the metallic materials used to manufacture the power transformer tank and the transformer oil used to support the operation of the power transformer are also in great demand.
SUMMERY OF THE UTILITY MODEL
In view of the above, embodiments of the present invention provide a voltage conversion apparatus for a power transformer, which at least partially overcomes the above-mentioned drawbacks in the prior art.
Embodiments of the present invention provide a voltage conversion apparatus for a power transformer. The voltage conversion apparatus includes: a first shield electrode connected to a first winding end of a power transformer, the first winding end being connected to a first winding of the power transformer; a second shield electrode connected to a second winding end portion of the power transformer, the second winding end portion being connected to a second winding of the power transformer; a third shield electrode connected to a wire end of the power transformer, the wire end being connected to a wire of the power transformer; and a transfer lever, a first end of the transfer lever being disposed in the first shielding electrode, a second end of the transfer lever being configured to be disposed in the second shielding electrode or the third shielding electrode, when the second end of the transfer lever is disposed in the second shielding electrode, a circuit of the power transformer includes the first winding and the second winding and an output voltage of the power transformer has a first voltage value, and when the second end of the transfer lever is disposed in the third shielding electrode, the circuit of the power transformer includes the first winding and the wire and the output voltage of the power transformer has a second voltage value, the first voltage value being greater than the second voltage value.
Optionally, the first winding end includes a first winding lead, the transfer bar includes a transfer lead, the second winding end includes a second winding lead, and the first winding is connected to the second winding via the first winding lead, the transfer lead, and the second winding lead when the second end of the transfer bar is disposed in the second shield electrode.
Optionally, the first winding end comprises a first winding lead, the transfer lever comprises a transfer lead, the wire end comprises a wire lead, and the first winding is connected to the wire via the first winding lead, the transfer lead, and the wire lead when the second end of the transfer lever is placed in the third shielding electrode.
Optionally, the first end of the transfer bar being disposed in the first shield electrode comprises: the first end of the transfer bar is connected to the first winding end connected to the first shield electrode with a bolt.
Optionally, when the second end of the conversion lever is placed in the second shielding electrode, the second end of the conversion lever is connected to the second winding end connected to the second shielding electrode with a bolt.
Optionally, when the second end of the transfer lever is placed in the third shielding electrode, the second end of the transfer lever is connected to the end of the wire connected to the third shielding electrode with a bolt.
Optionally, the second end of the conversion lever is placed in the second shielding electrode or the third shielding electrode by rotating the conversion lever, and the conversion lever can rotate 60 degrees.
Optionally, the first shield electrode, the second shield electrode and the third shield electrode are made of copper or aluminum.
Optionally, when the first shielding electrode, the second shielding electrode and the third shielding electrode are made of aluminum, a copper-aluminum transition piece is added between a connection point of each of the first shielding electrode, the second shielding electrode and the third shielding electrode and a corresponding end of the power transformer to realize electrical connection.
Optionally, the outer side of each of the first shielding electrode, the second shielding electrode and the third shielding electrode is wrapped with insulation of different thicknesses according to voltage class.
Optionally, the first voltage value is 130 kv and the second voltage value is 63 kv.
Optionally, the power transformer is a single phase power transformer or a three phase power transformer.
Optionally, the voltage conversion device is adapted to convert a voltage value of an output voltage of any phase of the power transformer.
As can be seen from the above-described aspects, the voltage value of the output voltage of the power transformer can be converted by rotating the conversion lever in the voltage conversion device according to the embodiment of the present invention. Therefore, the voltage conversion device provided by the embodiment of the utility model can be used for conveniently and quickly realizing the voltage conversion of the power transformer. In addition, the shielding electrode and the conversion rod included in the voltage conversion device according to the embodiment of the present invention are low in cost. Further, when the voltage conversion device is assembled in the case together with other components of the power transformer, only a small amount of assembly space is required because the volumes of the shield electrode and the conversion lever are small. Accordingly, the metallic materials used to manufacture the power transformer tank and the transformer oil used to support the operation of the power transformer are also in less demand.
The embodiment of the utility model also provides a power transformer. The power transformer comprises the voltage conversion device for the power transformer.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:
fig. 1 shows a front view of a voltage conversion device according to an embodiment of the present invention.
Fig. 2 shows a top view of a voltage conversion device according to an embodiment of the utility model.
Fig. 3 shows a schematic connection of a voltage conversion device according to an embodiment of the utility model to the output terminal of a power transformer.
Fig. 4 shows a wiring schematic for implementing voltage conversion using a voltage conversion device according to an embodiment of the present invention.
Wherein the reference numbers are as follows:
100: voltage conversion device 102: first shield electrode 104: second shielding electrode
106: third shield electrodes 108, 108': switching levers 110, 110': conversion lead wire
112. 112': lead insulation α: rotation angle 302: first winding end
304: first winding lead 306: lead insulation 308: first winding
310: second winding end portion 312: second winding lead 314: lead insulation
316: second winding 318: wire end 320: wire lead
322: lead wire insulation 324: a conducting wire U: u phase
V: v phase W: w phase N: n phase
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 by referring to the following examples. It should be understood that these examples are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the claims. Various embodiments may omit, replace, or add various procedures or components as desired.
A voltage conversion apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 shows a front view of a voltage conversion device 100 according to an embodiment of the present invention. In the present invention, the voltage conversion apparatus 100 may be adapted to convert the voltage value of the output voltage of the power transformer.
As shown in fig. 1, a voltage converting device 100 according to an embodiment of the present invention may include a set of shielding electrodes, such as a first shielding electrode 102, a second shielding electrode 104, and a third shielding electrode 106. The shielding electrode is an important component in power systems and can be used to improve the electric field distribution, make the electric field uniform, shield sharp corners of bolted connections and lead wires, and thus reduce the insulation distance from surrounding objects. The shield electrodes may also be referred to as voltage-sharing balls. First shield electrode 102, second shield electrode 104, and third shield electrode 106 may be made of copper or aluminum. Preferably, the outer sides of first shield electrode 102, second shield electrode 104, and third shield electrode 106 may be wrapped with insulation of different thicknesses depending on the voltage class to further reduce the insulation distance. The appearance of first shield electrode 102, second shield electrode 104, and third shield electrode 106 may be various shapes, such as cylindrical, spherical, etc. In addition, the first shield electrode 102, the second shield electrode 104, and the third shield electrode 106 may have other structures in addition to the structure shown in fig. 1.
The voltage conversion apparatus 100 according to an embodiment of the present invention may further include a conversion lever 108. Toggle bar 108 can include a toggle lead 110. The transfer leads 110 may be made of a conductive material such as copper. The transfer lever 108 may also include a lead insulation 112 on the transfer lead 110. The lead insulation 112 may be made of insulating paper or other soft insulating material.
The conversion lever 108 may be rotated to convert a voltage value of an output voltage of the power transformer. To facilitate the description of the rotation of the switching lever 108, fig. 2 shows a top view of the voltage conversion apparatus 100 according to an embodiment of the present invention.
As shown in fig. 2, the first end of the switching lever 108 may be always disposed in the first shielding electrode 102, and the second end of the switching lever 108 may be configured to be disposed in the second shielding electrode 104 or the third shielding electrode 106. For example, the second end of the conversion lever 108 may be placed in the second shielding electrode 104 or the third shielding electrode 106 by rotating the conversion lever 108. The angle by which the transfer lever 108 can rotate is α. Preferably, α may be 60 degrees.
When the second end of the transfer bar 108 is disposed in the second shielding electrode 104, the output voltage of the power transformer may have a first voltage value. When the second end of the transfer lever 108 is disposed in the third shielding electrode 106, the output voltage of the power transformer may have a second voltage value. The first voltage value may be greater than the second voltage value. For example, the first voltage value may be 130 kv and the second voltage value may be 63 kv. The principle of converting the voltage value of the output voltage of the power transformer by rotating the conversion lever 108 will be described later with reference to fig. 3 and 4.
Preferably, first shielding electrode 102, second shielding electrode 104 and third shielding electrode 106 may be arranged on a horizontal plane and distributed in an equilateral triangle.
Preferably, the voltage conversion apparatus 100 according to an embodiment of the present invention may be disposed in a case of a power transformer. A hand hole may be provided at a position corresponding to the voltage conversion apparatus 100 on the cover above the case. The voltage conversion device 100 can be operated by opening a hand hole to realize voltage conversion of the output voltage of the power transformer.
It should be understood that the number of shield electrodes shown in the drawings of the present application is merely exemplary. The voltage converting device may comprise a larger number of shielding electrodes, depending on the requirements of the actual application. In the case where the voltage conversion device includes a larger number of shield electrodes, the voltage conversion device can convert the voltage value of the output voltage of the power transformer into a larger voltage value. For example, in the case where the voltage conversion device includes four shield electrodes, the voltage conversion device may convert the voltage value of the output voltage of the power transformer into three voltage values.
Fig. 3 shows a schematic connection diagram of the voltage conversion device 100 according to an embodiment of the present invention to an output terminal of a power transformer.
The first shielding electrode 102 may be connected to a first winding end 302 of the power transformer. In one embodiment, the first shield electrode 102 may be bolted to the first winding end 302. The first winding end 302 may be connected to a first winding 308 of a power transformer. The first end of the switching bar 108 may be always disposed in the first shielding electrode 102. In one embodiment, a first end of the transfer lever 108 may be coupled to the first winding end 302 coupled to the first shield electrode 102 using a bolt. The first winding end 302 may include a first winding lead 304 and a lead insulation 306 on the first winding lead 304.
The second shielding electrode 104 may be connected to a second winding end 310 of the power transformer. In one embodiment, the second shielding electrode 104 may be bolted to the second winding end 310. The second winding end 310 may be connected to a second winding 316 of the power transformer. When the second end of the transfer bar 108 is disposed in the second shielding electrode 104, the electrical circuit of the power transformer may include a first winding 308 and a second winding 316. At this time, the output voltage of the power transformer may have a first voltage value. In one embodiment, when the second end of the switching lever 108 is disposed in the second shielding electrode 104, the second end of the switching lever 108 may be connected to the second winding end portion 310 connected to the second shielding electrode 104 using a bolt. The second winding end 310 may include a second winding lead 312 and a lead insulation 314 on the second winding lead 312. When the second end of the transfer bar 108 is disposed in the second shield electrode 104, the first winding 308 may be connected to the second winding 316 via the first winding lead 304, the transfer lead 110, and the second winding lead 312.
The third shielding electrode 106 may be connected to a wire end 318 of the power transformer. In one embodiment, the third shield electrode 106 may be bolted to the wire end 318. Wire end 318 may be connected to a wire 324 of a power transformer. When the second end of the transfer bar 108 is disposed in the third shielding electrode 106, the electrical circuit of the power transformer may include the first winding 308 and the conductor 324. At this time, the output voltage of the power transformer has a second voltage value. The second voltage value may be less than the first voltage value. For example, the first voltage value may be 130 kv and the second voltage value may be 63 kv. In one embodiment, when the second end of the transfer lever 108 is disposed in the third shielding electrode 106, a bolt may be used to connect the second end of the transfer lever 108 to the end of the wire 318 that is connected to the third shielding electrode 104. The wire end 318 may include a wire lead 320 and a lead insulation 322 on the wire lead 320. When the second end of the transfer bar 108 is disposed in the third shielding electrode 106, the first winding 308 may be connected to the wire 324 via the first winding lead 304, the transfer lead 110, and the wire lead 320. Fig. 3 shows a scenario where the second end of the conversion lever 108 is placed in the third shielding electrode 106.
As previously mentioned, the first shielding electrode 102, the second shielding electrode 104 and the third shielding electrode 106 comprised by the voltage conversion device 100 may be made of copper or aluminum. When first, second, and third shielding electrodes 102, 104, and 106 are made of aluminum, a copper-aluminum transition piece may be added between the connection of each of first, second, and third shielding electrodes 102, 104, and 106 to the respective end of the power transformer to make the electrical connection.
When the second end of the transfer lever 108 is disposed in the second shielding electrode 104, the lead 320 connected to the lead 324 is now disconnected. Since the end of the wire lead 320 is covered by the third shielding electrode 106, the electric field generated thereby can be shielded, thereby preventing the occurrence of the breakdown or discharge phenomenon. Similarly, when the second end of the transfer lever 108 is disposed in the third shield electrode 106, the second winding lead 312, which is connected to the second winding 316, is now open. Since the end of the second winding lead 312 is covered by the second shielding electrode 104, the electric field generated thereby can be shielded, thereby preventing the occurrence of the breakdown or discharge phenomenon.
Fig. 4 shows a wiring schematic for implementing voltage conversion using a voltage conversion device according to an embodiment of the present invention.
In fig. 4, the power transformer is exemplified as a three-phase power transformer, but it should be understood that the voltage conversion apparatus according to the embodiment of the present invention is also applicable to converting the voltage value of the output voltage of the power transformer having other number of phases. For example, the voltage conversion apparatus according to the embodiment of the present invention is also suitable for converting the voltage value of the output voltage of the single-phase power transformer. In addition, in fig. 4, the U-phase of the power transformer is taken as an example for explanation, but it should be understood that the voltage conversion device according to the embodiment of the present invention is applicable to conversion of the voltage value of the output voltage of any phase of the power transformer.
In fig. 4, the U-phase circuit may always include the first winding 308. The first winding 308 is connected to the first winding lead 304. A first end of the transfer lead 110 may be disposed in the first shield electrode 102. The second end of the transfer lead 110 can be configured to be placed in the second shielding electrode 104 or the third shielding electrode 106.
When the second end of the transfer lead 110 is disposed in the second shield electrode 104, as shown by the transfer lead 110 'in fig. 3, the transfer lead 110' may be connected to the second winding lead 312 and further to the second winding 316 of the power transformer, and the U-phase circuit may include the first winding 308 and the second winding 316. Accordingly, the number of coil turns of the circuit may be the sum of the number of coil turns of the first winding 308 and the number of coil turns of the second winding 316. As is well known to those skilled in the art, the magnitude of the voltage is proportional to the number of coil turns. In the case where the number of turns of the coil on the input side of the power transformer is constant, a desired output voltage can be obtained by adjusting the number of turns of the coil on the output side. For example, the desired output voltage of the U-phase circuit may be obtained by adjusting the number of coil turns of the first winding 308 and/or the number of coil turns of the second winding 316. As an example, the voltage of the output voltage of the U-phase circuit at this time may be 130 kv.
When the second end of the transfer lead 110 is disposed in the third shielding electrode 106, the transfer lead 110 may be connected to the wire lead 320 and further to the wire 324 of the power transformer, and the U-phase circuit may include the first winding 308 and the wire 324. Accordingly, the number of coil turns of the circuit may be the number of coil turns of the first winding 308. Since the number of coil turns at this time is smaller than the number of coil turns when the changeover lead 110 'is connected to the second winding lead 312, the output voltage of the U-phase circuit at this time will be smaller than the output voltage of the U-phase circuit when the changeover lead 110' is connected to the second winding lead 312. As an example, the output voltage of the U-phase circuit at this time may be 63 kv.
As can be seen from the above solution, the voltage value of the output voltage of the power transformer can be converted by rotating the conversion lever of the voltage conversion device according to the embodiment of the present invention. Therefore, the voltage conversion device provided by the embodiment of the utility model can be used for conveniently and quickly realizing the voltage conversion of the power transformer.
In addition, the shielding electrode and the conversion rod included in the voltage conversion device according to the embodiment of the present invention are low in cost. As shown in fig. 4, each phase circuit of a three-phase power transformer may use three shielding electrodes and one transfer bar. For example, a U-phase circuit, a V-phase circuit, and a W-phase circuit may use three shielding electrodes and one switching bar, respectively. Thus, a total of nine shield electrodes and three conversion rods may be used. The shielding electrode and the transfer bar are low cost. The cost of the power transformer can be greatly reduced by using the voltage conversion device according to the embodiment of the utility model to replace an unloaded tap changer. As mentioned before, in the prior art, three-phase power transformers require the use of three unloaded tap changers. The cost of three voltage conversion devices according to embodiments of the utility model is also much less than the cost of three unloaded tap changers.
Further, when the voltage conversion device is assembled in the case together with other components of the power transformer, only a small amount of assembly space is required because the volumes of the shield electrode and the conversion lever are small. Accordingly, the metallic materials used to manufacture the power transformer tank and the transformer oil used to support the operation of the power transformer are also in less demand.
The embodiment of the utility model also provides a power transformer. The power transformer may comprise the voltage conversion arrangement 100 for a power transformer described above in connection with fig. 1 to 4.
The term "exemplary" used throughout this specification means "serving as an example, instance, or illustration," and does not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.
As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other definitions, whether explicit or implicit, may be included below, and a definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (14)
1. A voltage conversion arrangement (100) for a power transformer, characterized in that the voltage conversion arrangement (100) comprises:
a first shielding electrode (102), the first shielding electrode (102) being connected to a first winding end (302) of a power transformer, the first winding end (302) being connected to a first winding (308) of the power transformer;
a second shielding electrode (104), the second shielding electrode (104) being connected to a second winding end (310) of the power transformer, the second winding end (310) being connected to a second winding (316) of the power transformer;
a third shielding electrode (106), said third shielding electrode (106) being connected to a wire end (318) of said power transformer, said wire end (318) being connected to a wire (324) of said power transformer; and
a switching lever (108), a first end of the switching lever (108) being disposed in the first shielding electrode (102), a second end of the toggle lever (108) is configured to be positionable in either the second shield electrode (104) or the third shield electrode (106), when the second end of the conversion lever (108) is placed in the second shielding electrode (104), the circuit of the power transformer comprises the first winding (308) and the second winding (316) and the output voltage of the power transformer has a first voltage value, and when said second end of said switching rod (108) is placed in said third shielding electrode (106), the electrical circuit of the power transformer comprises the first winding (308) and the conductor (324) and the output voltage of the power transformer has a second voltage value, the first voltage value being greater than the second voltage value.
2. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that:
the first winding end (302) comprises a first winding lead (304), the switching lever (108) comprises a switching lead (110), the second winding end (310) comprises a second winding lead (312), and
the first winding (308) is connected to the second winding (316) via the first winding lead (304), the switching lead (110), and the second winding lead (312) when the second end of the switching lever (108) is disposed in the second shield electrode (104).
3. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that:
the first winding end (302) comprises a first winding lead (304), the transition lever (108) comprises a transition lead (110), the wire end (318) comprises a wire lead (320), and
the first winding (308) is connected to the wire (324) via the first winding lead (304), the transition lead (110), and the wire lead (320) when the second end of the transition lever (108) is disposed in the third shield electrode (106).
4. The voltage conversion arrangement (100) for a power transformer according to claim 1, wherein the placing of the first end of the conversion rod (108) in the first shielding electrode (102) comprises: connecting the first end of the transfer lever (108) to the first winding end (302) connected to a first shielding electrode (102) with a bolt.
5. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the second end of the conversion rod (108) is connected to the second winding end (310) connected to the second shielding electrode (104) with a bolt when the second end of the conversion rod (108) is placed in the second shielding electrode (104).
6. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the second end of the conversion lever (108) is connected to the wire end (318) connected to the third shielding electrode (106) with a bolt when the second end of the conversion lever (108) is placed in the third shielding electrode (106).
7. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the second end of the conversion lever (108) is placed in the second shielding electrode (104) or the third shielding electrode (106) by rotating the conversion lever (108), and the conversion lever (108) is rotatable 60 degrees.
8. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the first shielding electrode (102), the second shielding electrode (104) and the third shielding electrode (106) are made of copper or aluminum.
9. The voltage conversion arrangement (100) for a power transformer according to claim 8, characterized in that when the first shield electrode (102), the second shield electrode (104) and the third shield electrode (106) are made of aluminum, copper aluminum transitions are added between the connection of each of the first shield electrode (102), the second shield electrode (104) and the third shield electrode (106) with the respective end of the power transformer to achieve electrical connection.
10. The voltage conversion arrangement (100) for a power transformer according to claim 8, characterized in that the outside of each of the first (102), second (104) and third (106) shielding electrode is wrapped with insulation of different thickness depending on voltage class.
11. The voltage conversion arrangement (100) for an electrical transformer according to claim 1, characterized in that the first voltage value is 130 kv and the second voltage value is 63 kv.
12. Voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the power transformer is a single-phase power transformer or a three-phase power transformer.
13. The voltage conversion arrangement (100) for a power transformer according to claim 1, characterized in that the voltage conversion arrangement (100) is adapted to convert the voltage value of the output voltage of any phase of the power transformer.
14. An electric transformer, characterized in that it comprises a voltage conversion arrangement (100) for an electric transformer according to any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122203694.7U CN215527445U (en) | 2021-09-13 | 2021-09-13 | Voltage conversion device for power transformer and power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122203694.7U CN215527445U (en) | 2021-09-13 | 2021-09-13 | Voltage conversion device for power transformer and power transformer |
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| CN215527445U true CN215527445U (en) | 2022-01-14 |
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| CN202122203694.7U Active CN215527445U (en) | 2021-09-13 | 2021-09-13 | Voltage conversion device for power transformer and power transformer |
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Address after: No.10, Weihua West Road, Shizhong District, Jinan City, Shandong Province, 250022 Patentee after: Jinan Siemens Energy Transformer Co.,Ltd. Address before: No.10, Weihua West Road, Shizhong District, Jinan City, Shandong Province, 250022 Patentee before: SIEMENS TRANSFORMER (JINAN) CO.,LTD. |
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