CN113963923B - Multistage coarse-fine regulating transformer - Google Patents
Multistage coarse-fine regulating transformer Download PDFInfo
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- CN113963923B CN113963923B CN202111265762.0A CN202111265762A CN113963923B CN 113963923 B CN113963923 B CN 113963923B CN 202111265762 A CN202111265762 A CN 202111265762A CN 113963923 B CN113963923 B CN 113963923B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims description 18
- 238000004804 winding Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention provides a multistage coarse-fine regulating transformer, which belongs to the technical field of transformers and comprises a first transformer body and a second transformer body; the first body comprises a first iron core column, a fine tuning coil, a coarse tuning coil group, a first high-voltage coil and a first low-voltage coil; the second body comprises a second iron core column, a second high-voltage coil and a second low-voltage coil, and the tail end of the second high-voltage coil is connected with the fine-tuning coil; the second low-voltage coil is connected with the first low-voltage coil in series; the coarse tuning coil group comprises a first coarse tuning coil and a second coarse tuning coil, the winding directions of the second coarse tuning coil and the first coarse tuning coil are opposite, and the second coarse tuning coil and the first coarse tuning coil are both connected with the head end of the second high-voltage coil; the fine tuning coil is connected with the first coarse tuning coil or the second coarse tuning coil. According to the multistage coarse-fine tuning transformer provided by the invention, the first coarse tuning coil and the second coarse tuning coil which are opposite in winding direction are arranged on the structure of the first transformer body, so that the capacity of the second transformer body is reduced, and the cost of the transformer is reduced.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to a multi-stage coarse-fine regulating transformer.
Background
The low-voltage side voltage regulation level and the voltage regulation range are important parameters of a special transformer, and particularly for an electric furnace transformer, more voltage regulation levels and a wider voltage regulation range are often needed, and a multi-body multi-level thickness regulation structure is needed. The taps of the coarse tuning coils of the traditional multi-stage coarse tuning structure are linearly connected in series, and the voltage regulation of each stage of the transformer is realized by using a multi-stage coarse tuning switch through the combined switching of each stage of the coarse tuning coils and each stage of the fine tuning coils.
In the transformer with the multi-body multi-level coarse-fine regulation structure, in the whole voltage regulation range, the low voltage of the second body and the low voltage of the first body are always in the same direction, the ratio of the capacity of the second body to the capacity of the transformer is (v 1-v 2)/v 1 (v 1 is the upper limit of the voltage regulation range, v2 is the lower limit of the voltage regulation range), and the larger the voltage regulation range is, the larger the capacity of the second body is, and the worse the economy is.
Disclosure of Invention
The invention aims to provide a multistage coarse-fine regulating transformer, which aims to solve the problem of large capacity of a second body in a transformer structure.
In order to achieve the above purpose, the invention adopts the following technical scheme: provided is a multi-stage coarse and fine tuning transformer including:
the device comprises a first device body, a second device body and a third device body, wherein the first device body comprises a first iron core column, a fine tuning coil, a coarse tuning coil group, a first high-voltage coil and a first low-voltage coil which are sequentially arranged from inside to outside;
the second body comprises a second iron core column, a second high-voltage coil and a second low-voltage coil which are sequentially arranged from inside to outside, and the tail end of the second high-voltage coil is connected with the fine-adjustment coil by virtue of an adjusting switch group; the second low voltage coil is connected in series with the first low voltage coil;
the first coarse tuning coil and the second coarse tuning coil are connected with the head end of the second high-voltage coil; the fine tuning coil is connected with the first coarse tuning coil or the second coarse tuning coil by means of the tuning switch group.
As another embodiment of the present application, the adjusting switch group includes:
a coarse tuning tap selector, one end of the coarse tuning tap selector is connected with the fine tuning coil, and the other end of the coarse tuning tap selector is switched and connected to the first coarse tuning coil and the second coarse tuning coil;
and one end of the fine tuning tapping selector is connected with the second high-voltage coil, and the other end of the fine tuning tapping selector is connected with the fine tuning coil.
As another embodiment of the present application, the first coarse tuning coil is provided with a plurality of first tapping terminals for connecting to the coarse tuning tapping selector.
As another embodiment of the present application, the second coarse tuning coil is provided with a plurality of second tap terminals for connecting to the coarse tuning tap selector.
As another embodiment of the present application, a plurality of third tapping terminals are provided on the fine tuning coil, and the fine tuning tapping selector is switched to connect a plurality of tapping terminals.
As another embodiment of the present application, the number of turns of the second coarse tuning coil is an integer multiple of the number of turns of the fine tuning coil.
As another embodiment of the present application, the first coarse tuning coil turns are integer multiples of the fine tuning coil turns.
As another embodiment of the present application, the first coarse tuning coil and the second coarse tuning coil are connected by a first lead wire.
The multistage coarse and fine regulating transformer provided by the invention has the beneficial effects that: compared with the prior art, the multistage coarse-fine regulating transformer is characterized in that a first coarse-regulating coil and a second coarse-regulating coil which is opposite to the first coarse-regulating coil in winding direction are arranged on a first transformer body, and the current directions of the second coarse-regulating coil and the first coarse-regulating coil are opposite; when the regulating switch group is connected with the first coarse regulating coil, the fine regulating coil, the second high-voltage coil and the fine regulating coil, the second high-voltage coil on the second body is positive voltage, the voltage induced on the second low-voltage coil is positive voltage, and the positive voltage is output after the positive voltage induced on the second low-voltage coil is combined with the positive voltage on the first low-voltage coil; when the regulating switch group is connected with the second coarse regulating coil, the fine regulating coil, the second high-voltage coil and the fine regulating coil, the second high-voltage coil on the second body is negative voltage, the voltage induced on the second low-voltage coil is also negative voltage, and the positive voltage is output after the negative voltage induced on the second low-voltage coil and the positive voltage on the first low-voltage coil are combined. According to the multistage coarse-fine tuning transformer, the first coarse tuning coil and the second coarse tuning coil which are opposite in winding direction are arranged on the structure of the first transformer body, so that the voltage adjusting range of the second transformer body is reduced, and the cost of the transformer is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a multi-stage coarse-fine tuning transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a wiring principle of a multi-stage coarse-fine transformer according to an embodiment of the present invention.
In the figure: 1. a first body; 2. a first core limb; 3. fine-tuning the coil; 4. a first coarse tuning coil; 5. a second coarse tuning coil; 6. a first high voltage coil; 7. a first low voltage coil; 8. a second body; 9. a second core limb; 10. a second high voltage coil; 11. a second low voltage coil; 12. a coarse tap selector; 13. fine tuning the tap selector.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, a multi-stage coarse-fine transformer provided by the present invention will now be described. The multistage coarse-fine regulating transformer comprises a first body 1 and a second body 8; the first body 1 comprises a first iron core column 2, a fine tuning coil 3, a coarse tuning coil group, a first high-voltage coil 6 and a first low-voltage coil 7 which are sequentially arranged from inside to outside; the second body 8 comprises a second iron core limb 9, a second high-voltage coil 10 and a second low-voltage coil 11 which are sequentially arranged from inside to outside, and the tail end of the second high-voltage coil 10 is connected to the fine-tuning coil 3 by virtue of an adjusting switch group; the second low voltage coil 11 is connected in series with the first low voltage coil 7; the coarse tuning coil group comprises a first coarse tuning coil 4 and a second coarse tuning coil 5 which are sequentially arranged from inside to outside, the winding direction of the second coarse tuning coil 5 is opposite to that of the first coarse tuning coil 4, and the second coarse tuning coil 5 and the first coarse tuning coil 4 are connected with the head end of a second high-voltage coil 10; the fine tuning coil 3 is connected to the first coarse tuning coil 4 or the second coarse tuning coil 5 by means of a tuning switch group.
Compared with the prior art, the multistage coarse-fine tuning transformer provided by the invention has the advantages that the first coarse tuning coil 4 and the second coarse tuning coil 5 which is opposite to the first coarse tuning coil 4 in winding direction are arranged on the first body 1, and the current directions of the second coarse tuning coil 5 and the first coarse tuning coil 4 are opposite; when the regulating switch group is connected with the first coarse regulating coil 4, the fine regulating coil 3, the second high voltage coil 10 and the fine regulating coil 3, the second high voltage coil 10 on the second body 8 is positive voltage, the voltage induced on the second low voltage coil 11 is positive voltage, and the positive voltage is output after the positive voltage induced on the second low voltage coil 11 is combined with the positive voltage on the first low voltage coil 7; when the regulating switch group is connected with the second coarse regulating coil 5, the fine regulating coil 3, the second high voltage coil 10 and the fine regulating coil 3, the second high voltage coil 10 on the second body 8 is a negative voltage, the voltage induced on the second low voltage coil 11 is also a negative voltage, and the negative voltage induced on the second low voltage coil 11 is synthesized with the positive voltage on the first low voltage coil 7 to output a positive voltage.
The induced voltage of the second low voltage coil 11 of the second body 8 has a positive voltage and a negative voltage throughout the voltage regulation range, and the capacity of the second body 8 is proportional to the maximum value of the forward voltage regulation range and the reverse voltage regulation range. The number of turns of the second coarse tuning coil 5 is w1, the number of turns of the first coarse tuning coil 4 is w2, the number of turns of the fine tuning coil 3 is w3, and the capacity of the second body 8 is w 1/(w1+w2+w3). The capacity of the second body 8 is reduced compared to the capacity (w2+w3)/(w1+w2+w3) of the second body 8 of the conventional structure, and when w1—w2—w3=0, the capacity of the second body 8 is reduced to the minimum, and at this time, the capacity of the second body 8 is 1/2 of the capacity of the second body 8 of the conventional structure.
According to the multistage coarse-fine tuning transformer provided by the invention, the first coarse tuning coil 4 and the second coarse tuning coil 5 which are oppositely wound are arranged on the structure of the first transformer body 1, so that the voltage adjusting range of the second transformer body 8 can be reduced, the capacity of the second transformer body 8 can be reduced, and the cost of the transformer can be reduced.
Optionally, the first high voltage coil 6 is used for accessing an external source voltage, the second high voltage coil 10 is used for receiving the voltage output by the combination of the first coarse tuning coil 4, the second coarse tuning coil 5 and the fine tuning coil 3 of the first body 1 through the adjusting switch group, and the first low voltage coil 7 of the first body 1 is connected in series with the second low voltage coil 11 of the second body 8 to output all levels of voltages required by the low voltage side.
In some possible embodiments, referring to fig. 2, the set of adjustment switches includes a coarse tap selector 12 and a fine tap selector 13; one end of the coarse tuning tapping selector 12 is connected with the fine tuning coil 3, and the other end of the coarse tuning tapping selector 12 is switched and connected with the first coarse tuning coil 4 and the second coarse tuning coil 5; one end of the fine tap selector 13 is connected to the second high voltage coil 10, and the other end of the fine tap selector 13 is connected to the fine coil 3.
Specifically, one end of the coarse tuning tap selector 12 is connected to an end of the fine tuning coil 3, and the other end of the coarse tuning tap selector 12 is provided with a switching terminal for switching between and connecting the first coarse tuning coil 4 and the second coarse tuning coil 5 to adjust the positive and negative voltages and the voltage of the second high voltage coil 10 connected thereto.
One end of the fine tuning tap selector 13 is connected to the second end of the second high voltage coil 10, and the other end of the fine tuning tap selector 13 is connected to an adjusting terminal, which is connected to the fine tuning coil 3. The connection position of the adjusting terminal and the fine adjusting coil 3 is changed, so that the length of the fine adjusting coil 3 connected into the circuit is changed, and the voltage on the second high-voltage coil 10 is adjusted.
In some possible embodiments, referring to fig. 2, the first coarse tuning coil 4 is provided with a plurality of first tap terminals for connection to the coarse tuning tap selector 12.
Specifically, when the coarse tuning tap selector 12 is connected to the first coarse tuning coil 4 and the fine tuning coil 3, and the fine tuning tap selector 13 is connected to the second high voltage coil 10 and the fine tuning coil 3, the second high voltage coil 10 on the second body 8 is positive voltage, the voltage induced on the second low voltage coil 11 is positive voltage, and the positive voltage is output after the positive voltage induced on the second low voltage coil 11 is combined with the positive voltage on the first low voltage coil 7.
A plurality of first tap terminals are led out at intervals along the axial direction of the first coarse tuning coil 4 for connection to the switch terminals on the coarse tuning tap selector 12. The coarse tuning tap selector 12 is adjusted and the switch terminals are switched with the plurality of first tap terminals on the first coarse tuning coil 4 to change the number of turns of the first coarse tuning coil 4 connected to the circuit, thereby achieving the purpose of adjusting the voltage level of the second high voltage coil 10.
In some possible embodiments, referring to fig. 2, the second coarse tuning coil 5 is provided with a plurality of second tap terminals for connection to the coarse tuning tap selector 12.
Specifically, when the coarse tuning tap selector 12 is connected to the second coarse tuning coil 5 and the fine tuning coil 3, and the fine tuning tap selector 13 is connected to the second high voltage coil 10 and the fine tuning coil 3, the second high voltage coil 10 on the second body 8 is a negative voltage, the voltage induced on the second low voltage coil 11 is a negative voltage, and the negative voltage induced on the second low voltage coil 11 is combined with the positive voltage on the first low voltage coil 7 to output a positive voltage.
A plurality of second tap terminals are led out at intervals along the axial direction of the second coarse tuning coil 5 for connection to the switch terminals on the coarse tuning tap selector 12. When the switching terminal is connected to the second coarse tuning coil 5, the second high voltage coil 10 is negative voltage, the coarse tuning tap selector 12 is adjusted, and the switching terminal is switched to connect a plurality of second tap terminals for adjusting the voltage of the second high voltage coil 10.
In some possible embodiments, referring to fig. 2, the fine tuning coil 3 is provided with a plurality of third tapping terminals, and the fine tuning tapping selector 13 is switched to connect the plurality of third tapping terminals.
Specifically, after the connection position of the coarse tap selector 12 is determined, the voltage on the second high voltage coil 10 is finely adjusted by adjusting the fine tap selector 13. The fine tuning coil 3 is provided with a plurality of third tapping terminals arranged at intervals along the axial direction thereof, and the third tapping terminals are connected with the adjusting terminals on the fine tuning tapping selector 13. In the working process, the adjusting terminals are switched and connected with a plurality of third tapping terminals, so that the purpose of adjusting the voltage on the second high-voltage coil 10 is achieved.
Specifically, the number of turns of the second coarse tuning coil 5 is an integer multiple of the number of turns of the fine tuning coil 3.
Specifically, the number of turns of the first coarse tuning coil 4 is an integer multiple of the number of turns of the fine tuning coil 3. The winding direction of the second coarse tuning coil 5 is opposite to that of the first coarse tuning coil 4, and the first coarse tuning coil 4 and the second coarse tuning coil 5 need to be connected to the same end of the second high voltage coil 10.
Optionally, the first coarse tuning coil 4 and the second coarse tuning coil 5 are formed by reversely winding the same wire. The first coarse tuning coil 4 is wound up from below to the top of the leg, the back tuning wire is wound back down from the top of the leg to the bottom of the leg, and the second coarse tuning coil 5 is wound back down from the top of the leg. The first coarse tuning coil 4 and the second coarse tuning coil 5 are connected at the top of the core limb, and the positions where they are connected are wire-connected with the second high voltage coil 10.
Alternatively, the first coarse tuning coil 4 and the second coarse tuning coil 5 are connected by a first lead. A first lead may be used to connect the first end of the first coarse tuning coil 4 to the first end of the second coarse tuning coil 5 and then to connect the first lead to the end of the second high voltage coil 10. The first end of the first coarse tuning coil 4 and the first end of the second coarse tuning coil 5 are located at the same end in the coil length direction.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. A multi-stage coarse-fine tuning transformer, comprising:
the device comprises a first device body, a second device body and a third device body, wherein the first device body comprises a first iron core column, a fine tuning coil, a coarse tuning coil group, a first high-voltage coil and a first low-voltage coil which are sequentially arranged from inside to outside;
the second body comprises a second iron core column, a second high-voltage coil and a second low-voltage coil which are sequentially arranged from inside to outside, and the tail end of the second high-voltage coil is connected with the fine-adjustment coil by virtue of an adjusting switch group; the second low voltage coil is connected in series with the first low voltage coil;
the first coarse tuning coil and the second coarse tuning coil are connected with the head end of the second high-voltage coil; the fine tuning coil is connected with the first coarse tuning coil or the second coarse tuning coil by means of the adjusting switch group;
the regulating switch group includes:
a coarse tuning tap selector, one end of the coarse tuning tap selector is connected with the fine tuning coil, and the other end of the coarse tuning tap selector is switched and connected to the first coarse tuning coil and the second coarse tuning coil;
and one end of the fine tuning tapping selector is connected with the second high-voltage coil, and the other end of the fine tuning tapping selector is connected with the fine tuning coil.
2. A multi-stage coarse and fine tuning transformer as recited in claim 1 wherein said first coarse tuning coil is provided with a plurality of first tap terminals for connection to said coarse tuning tap selector.
3. A multi-level coarse and fine transformer as recited in claim 2 wherein said second coarse tuning coil is provided with a plurality of second tap terminals for connection to said coarse tuning tap selector.
4. A multilevel coarse-fine tuning transformer according to claim 3, wherein a plurality of third tap terminals are provided on the fine tuning coil, and the fine tuning tap selector switches to connect a plurality of the tap terminals.
5. The multi-stage coarse and fine tuning transformer of claim 1, wherein the number of turns of the second coarse tuning coil is an integer multiple of the number of turns of the fine tuning coil.
6. The multi-stage coarse and fine tuning transformer of claim 1, wherein the first coarse tuning coil turns are integer multiples of the fine tuning coil turns.
7. A multi-stage coarse and fine tuning transformer as recited in claim 1, wherein the first coarse tuning coil and the second coarse tuning coil are connected by a first lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111265762.0A CN113963923B (en) | 2021-10-28 | 2021-10-28 | Multistage coarse-fine regulating transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111265762.0A CN113963923B (en) | 2021-10-28 | 2021-10-28 | Multistage coarse-fine regulating transformer |
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| Publication Number | Publication Date |
|---|---|
| CN113963923A CN113963923A (en) | 2022-01-21 |
| CN113963923B true CN113963923B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111265762.0A Active CN113963923B (en) | 2021-10-28 | 2021-10-28 | Multistage coarse-fine regulating transformer |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232614A (en) * | 1968-10-12 | 1971-05-19 | ||
| CN202422973U (en) * | 2011-12-30 | 2012-09-05 | 天威云南变压器股份有限公司 | Power transformer |
| CN205177585U (en) * | 2015-10-22 | 2016-04-20 | 浙江江山变压器股份有限公司 | Duplex winding multiunit closes single phase transformer of transform |
| CN206921640U (en) * | 2017-05-31 | 2018-01-23 | 济南西门子变压器有限公司 | The tap-changing windings and its power transformer of power transformer |
| CN109935455A (en) * | 2019-04-30 | 2019-06-25 | 江苏华鹏变压器有限公司 | A kind of 110kV dry-type three-phase transformer |
| CN110634664A (en) * | 2019-10-29 | 2019-12-31 | 江苏华鹏变压器有限公司 | Low-voltage dual-voltage regulating coil and transformer |
| CN212967389U (en) * | 2020-10-20 | 2021-04-13 | 西安西电变压器有限责任公司 | Power transformer adopting four-way parallel voltage regulation structure |
| CN213183948U (en) * | 2020-09-27 | 2021-05-11 | 特变电工沈阳变压器集团有限公司 | Test transformer combining self-coupling connection and coarse and fine voltage regulation modes |
-
2021
- 2021-10-28 CN CN202111265762.0A patent/CN113963923B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232614A (en) * | 1968-10-12 | 1971-05-19 | ||
| CN202422973U (en) * | 2011-12-30 | 2012-09-05 | 天威云南变压器股份有限公司 | Power transformer |
| CN205177585U (en) * | 2015-10-22 | 2016-04-20 | 浙江江山变压器股份有限公司 | Duplex winding multiunit closes single phase transformer of transform |
| CN206921640U (en) * | 2017-05-31 | 2018-01-23 | 济南西门子变压器有限公司 | The tap-changing windings and its power transformer of power transformer |
| CN109935455A (en) * | 2019-04-30 | 2019-06-25 | 江苏华鹏变压器有限公司 | A kind of 110kV dry-type three-phase transformer |
| CN110634664A (en) * | 2019-10-29 | 2019-12-31 | 江苏华鹏变压器有限公司 | Low-voltage dual-voltage regulating coil and transformer |
| CN213183948U (en) * | 2020-09-27 | 2021-05-11 | 特变电工沈阳变压器集团有限公司 | Test transformer combining self-coupling connection and coarse and fine voltage regulation modes |
| CN212967389U (en) * | 2020-10-20 | 2021-04-13 | 西安西电变压器有限责任公司 | Power transformer adopting four-way parallel voltage regulation structure |
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| CN113963923A (en) | 2022-01-21 |
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