CN202093954U - Phase-shift rectifier transformer and serial-connection topology frequency converter - Google Patents
Phase-shift rectifier transformer and serial-connection topology frequency converter Download PDFInfo
- Publication number
- CN202093954U CN202093954U CN2011201725490U CN201120172549U CN202093954U CN 202093954 U CN202093954 U CN 202093954U CN 2011201725490 U CN2011201725490 U CN 2011201725490U CN 201120172549 U CN201120172549 U CN 201120172549U CN 202093954 U CN202093954 U CN 202093954U
- Authority
- CN
- China
- Prior art keywords
- secondary winding
- phase
- winding
- phase secondary
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model relates to a phase-shift rectifier transformer and a serial-connection topology frequency converter, wherein the phase-shift rectifier transformer comprises an iron core, as well as a primary winding, a secondary winding and an auxiliary winding which are wound on the iron core; and the secondary winding comprises an A-phase secondary winding, a C-phase secondary winding and a B-phase secondary winding which is arranged between the A-phase secondary winding and the C-phase secondary winding, wherein the A-phase secondary winding is wound backwards and the C-phase secondary winding is wound forwards. In the utility model, by the regulation on the winding order of the A-phase secondary winding and the C-phase secondary winding of the transformer, the safety insulation distance among the A-phase secondary winding, the B-phase secondary winding and the C-phase secondary winding as well as inside the windings is optimized, therefore the design size and cost are reduced; the optimal design is applicable to the phase-shift rectifier transformers of all serial-connection topology type middle voltage frequency converters, including horizontal transformers and vertical transformers as well as similar transformers with special structures; in addition, the optimal design does not cause any influence to the operation principle of the whole frequency converter constituted by transformers.
Description
Technical field
The utility model relates to transformer, more particularly, relates to a kind of phase-shifting rectifier transformer and series connection topology frequency converter.
Background technology
High voltage motor occupies very big proportion in power consumption, wherein high voltage motor uses high voltage converter to drive.Typical 8 module 10KV connect topological structure medium voltage frequency converter system as shown in fig. 1, comprise phase shifting transformer 1, power cell 2 and motor 3, wherein power cell a1, a2, a3 ... the A that a8 forms system exports mutually, power cell b1, b2, b3 ... the B that b8 forms system exports mutually, power cell c1, c2, c3 ... the C that c8 forms system exports mutually, and three-phase output drags high-voltage motor 3 drive systems.
Phase-shifting rectifier transformer structure that above-mentioned medium voltage frequency converter system uses and secondary winding mode as shown in Figures 2 and 3, Fig. 2 is the vertical structure transformer, Fig. 3 is the horizontal type structure transformer, the phase-shifting rectifier transformer safety is analyzed schematic diagram as shown in Figure 4.Wherein, transformer comprises transformer core 11, former limit winding 13, secondary winding 15, and auxiliary winding 18.Secondary winding 15 comprises: A exports secondary winding 12, B mutually and exports secondary winding 14, C three-phase output secondary mutually around 16.It is d1 that transformer A exports the electrical distance that cake and B export between the cake mutually mutually, and it is d2 that B exports the electrical distance that cake and C export between the cake mutually mutually, secondary mutually between cake between the winding electrical distance be d3.
According to the topological structure characteristics and the working method of above-mentioned series connection high voltage converter, the setting module input voltage is V, and module series connection number is N, then will bear the insulation voltage of NV between d1 and the d2.As shown in Figure 4, according to the general technique for coiling of industry, between A8 and the B1 because the series connection 9 modules, if a power cell output voltage grade is 700V, then pressure reduction is 6300kV between A8 and the B1, and the d1 distance as shown in Fig. 2 and 3 that then needs to guarantee is determined by 6300V voltage.The distance that needs between B8 and the C1 to guarantee d2 as shown in Fig. 2 and 3 must be determined by 6300V voltage equally.Be so limited, bigger safety required distance is arranged between d1 and the d2, cause consumption unshakable in one's determination to increase, transformer overall dimensions and cost increase.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of phase-shifting rectifier transformer and series connection topology frequency converter.
The technical scheme that its technical problem that solves the utility model adopts is:
Construct a kind of phase-shifting rectifier transformer, comprise iron core, and be wound on former limit winding, secondary winding and auxiliary winding on the described iron core; Described secondary winding comprises A phase secondary winding, C phase secondary winding, and be arranged on B phase secondary winding between described A phase secondary winding and the described C phase secondary winding, wherein, described A phase secondary winding adopts reverse coiling, and described C phase secondary winding adopts the forward coiling.
In the phase-shifting rectifier transformer described in the utility model, described B phase secondary winding adopts and mixes the preface coiling.
In the phase-shifting rectifier transformer described in the utility model, described B phase secondary winding adopts two to become big mixed preface coiling gradually to the centre.
In the phase-shifting rectifier transformer described in the utility model, described A phase secondary winding comprises N separate sub-winding, is designated as AN; Described B phase secondary winding comprises N separate sub-winding, is designated as BN; Described C phase secondary winding comprises each separate sub-winding of N, is designated as CN; Wherein, described N is a natural number.
In the phase-shifting rectifier transformer described in the utility model, be provided with insulating barrier between the adjacent sub-winding.
In the phase-shifting rectifier transformer described in the utility model, the material difference of described insulating barrier and/or thickness difference.
In the phase-shifting rectifier transformer described in the utility model, described phase-shifting rectifier transformer is vertical transformer or horizontal type transformer.
In the phase-shifting rectifier transformer described in the utility model, described phase-shifting rectifier transformer is dry-type transformer or oil-filled transformer.
The utility model also provides a kind of series connection topological frequency converter, comprises above-mentioned phase-shifting rectifier transformer, and described A phase secondary winding, B phase secondary winding and C phase secondary winding output separately are connected motor through power cell respectively.
The beneficial effects of the utility model are: the A by the regulation transformer mutually and C the secondary winding technique is in proper order mutually, optimize the safety distance between A phase secondary winding, B phase secondary winding and the C phase secondary winding, thereby reduce design size and cost, be applicable to the optimal design of phase-shifting rectifier transformer of the medium voltage frequency converter of all topological patterns of connecting, comprise horizontal type transformer and vertical transformer, and the transformer of similar special construction.Do not change the one-to-one relationship that transformer secondary winding is connected with the complete machine power cell owing to change secondary winding technique order, therefore can not produce any influence the frequency converter complete machine operation logic that constitutes by transformer.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is a medium voltage frequency converter system configuration schematic diagram of the prior art;
Fig. 2 is the phase-shifting rectifier transformer schematic diagram of vertical structure of the prior art;
Fig. 3 is the phase-shifting rectifier transformer schematic diagram of horizontal type structure of the prior art;
Fig. 4 is that the phase-shifting rectifier transformer safety among Fig. 2 and Fig. 3 is analyzed schematic diagram;
Fig. 5 is the vertical structure phase-shifting rectifier transformer structural representation of the utility model embodiment one;
Fig. 6 is the vertical structure phase-shifting rectifier transformer structural representation of the utility model embodiment two;
Fig. 7 is the vertical structure phase-shifting rectifier transformer structural representation of the utility model embodiment three.
Embodiment
The phase-shifting rectifier transformer structure of the utility model preferred embodiment as shown in Figure 5, it comprises unshakable in one's determination 21, and is wound on former limit winding, secondary winding and auxiliary winding 28 on the iron core 21.Wherein the secondary winding comprises A phase secondary winding 22, C phase secondary winding 26, and is arranged on the B phase secondary winding 24 between A phase secondary winding 22 and the C phase secondary winding 26, and the A that is respectively applied for the realization phase-shifting rectifier transformer exports mutually, B exports mutually with C and exports mutually.The 22 reverse coilings of A phase secondary winding, the 26 forward coilings of C phase secondary winding.Pass through the A phase and the C secondary winding technique order mutually of regulation transformer like this, make B phase secondary winding 24 no matter adopt which kind of coilings order can optimize safety distance between A phase secondary winding 22, B phase secondary winding 24 and the C phase secondary winding 26, reduce consumption unshakable in one's determination significantly, reduce the overall volume of transformer, thereby reduce cost.
In the foregoing description, A phase secondary winding 22 comprises N separate sub-winding, is designated as AN.B phase secondary winding 24 comprises N separate sub-winding, is designated as BN.C phase secondary winding 26 comprises each separate sub-winding of N, is designated as CN.Wherein, N is a natural number, for example can be 5, or 8, can also be 3,6,9 etc.When N was 8, as shown in Figure 5, A phase secondary winding 22 comprised sub-winding A1, sub-winding A2, sub-winding A3, sub-winding A4, sub-winding A5, sub-winding A6, sub-winding A7, sub-winding A8.B phase secondary winding 24 comprises sub-winding B1, sub-winding B2, sub-winding B3, sub-winding B4, sub-winding B5, sub-winding B6, sub-winding B7, sub-winding B8.C phase secondary winding 26 comprises sub-winding C1, sub-winding C2, sub-winding C3, sub-winding C4, sub-winding C5, sub-winding C6, sub-winding C7, sub-winding C8.
In embodiment one, be example with the vertical transformer of 10kV, as shown in Figure 5, A phase secondary winding 22 adopts reverse coiling, and C phase secondary winding 26 adopts the forward coiling, and B phase secondary winding 24 adopts and mixes the preface coiling, also available following table 1 expression:
Table 1
Each sub-winding in the A phase secondary winding 22 sorts according to reverse coiling, each sub-winding in the C phase secondary winding 26 sorts according to the forward coiling, if therefore the output voltage grade of single sub-winding is 700V, safety between each sub-winding in the A phase secondary winding 22 distance only need consider according to 700V, with C mutually in the secondary winding 26 safety between the adjacent sub-winding get final product apart from d3 is equal.And B phase secondary winding 24 adopts mixed preface coiling, as shown in the figure, 4 modules of being separated by between the sub-winding B8 of the sub-winding B3 of B phase secondary winding 24 and B phase secondary winding 24, so will bear 700* (4+1)=3500V voltage, so the safety between the sub-winding B8 of the sub-winding B3 of B phase secondary winding 24 and B phase secondary winding 24 will be considered apart from d1 according to 3500V; 3 modules of being separated by between the sub-winding B4 of B phase secondary winding 24 and the C phase secondary winding 26 sub-winding C1, so will bear 700* (3+1)=2800V voltage, so the safety between the sub-winding B4 of B phase secondary winding 24 and the C phase secondary winding 26 sub-winding C1 need be considered apart from d2 according to 2800V; And the distance of the safety between other sub-windings of B phase secondary winding 24 also only need be considered to get final product according to 700V.Two safety distances with the 6300V design of needs compared with prior art reduce (the safety distance of other sub-winding is all with the 700V design) greatly like this, the whole height of transformer has largely and reduces, the use amount unshakable in one's determination of transformer also can reduce greatly, thereby reduces design cost.
In embodiment two, be example with the vertical transformer of 10kV, as shown in Figure 6, A phase secondary winding 22 adopts reverse coiling, and C phase secondary winding 26 adopts the forward coiling, and B phase secondary winding 24 adopts and mixes the preface coiling, available following table 2 expression:
Table 2
Each sub-winding in the A phase secondary winding 22 sorts according to reverse coiling, each sub-winding in the C phase secondary winding 26 sorts according to the forward coiling, if therefore the output voltage grade of single sub-winding is 700V, safety between each sub-winding in the A phase secondary winding 22 distance only need consider according to 700V, with C mutually in the secondary winding 26 safety between the adjacent sub-winding get final product apart from d3 is equal.And B phase secondary winding 24 adopts mixed preface coiling, as shown in the figure, 2 modules of being separated by between the sub-winding A1 of the sub-winding B3 of B phase secondary winding 24 and A phase secondary winding 22, so will bear 700* (2+1)=2100V voltage, therefore, the safety between the sub-winding A1 of the sub-winding B3 of B phase secondary winding 24 and A phase secondary winding 22 need be considered according to 2100V apart from d1; 1 module of being separated by between the sub-winding B8 of the sub-winding B6 of B phase secondary winding 24 and B phase secondary winding 24, so will bear 700* (1+1)=1400V voltage, so the safety between the sub-winding B8 of the sub-winding B6 of B phase secondary winding 24 and B phase secondary winding 24 need be considered apart from d2 according to 1400V; 4 modules of being separated by between the sub-winding B2 of the sub-winding B7 of B phase secondary winding 24 and B phase secondary winding 24, so will bear 700* (4+1)=3500V voltage, so the safety between the sub-winding B2 of the sub-winding B7 of B phase secondary winding 24 and B phase secondary winding 24 need be considered apart from d4 according to 3500V; And the distance of the safety between other sub-windings of B phase secondary winding 24 also only need be considered to get final product according to 700V.Two safety distances with the 6300V design of needs compared with prior art reduce (the safety distance of other sub-winding is all with the 700V design) greatly like this, the whole height of transformer has largely and reduces, the use amount unshakable in one's determination of transformer also can reduce greatly, thereby reduces design cost.
If change the vertical transformer among Fig. 5 and Fig. 6 into horizontal type transformer, then also can adopt the principle of optimality same as described above to design, promptly make A phase secondary winding 22 adopt reverse coiling, C phase secondary winding 26 adopts the forward coiling, B phase secondary winding 24 adopts identical mixed preface coiling, can make the use amount unshakable in one's determination of horizontal type transformer reduce greatly equally, thereby reduce design cost, and the whole frontal width of transformer has reduction largely.
By above embodiment as can be known; as long as A phase secondary winding 22 adopts reverse coiling; described C phase secondary winding 26 adopts the forward coiling; no matter B phase secondary winding 24 adopts A, B, the C three-phase secondary method of winding of the existing relatively phase-shifting rectifier transformer of which kind of winding method can optimize safety distance between A phase secondary winding, B phase secondary winding and the C phase secondary winding (be about former safety distance half); thereby reduce design size and cost, so which kind of mode B secondary winding 24 adopts carry out coiling all in protection range of the present utility model.Simultaneously when B phase secondary winding 24 adopt as first embodiment and second embodiment in mixed preface coiling the time, owing to have at least two long insulating barriers at B phase secondary winding 24, because the safety of these insulating barriers is higher apart from design voltage, therefore the safety distance is also bigger, in the total distance of safety that reduces between A phase, B phase and the C phase,, the total distance of safety between each sub-winding each sub-winding in the B phase secondary winding 24 has also been played thermolysis preferably like this by being evenly distributed in the B phase secondary winding 24.
In embodiment three, be example with the vertical transformer of 10kV, as shown in Figure 7, A phase secondary winding 22 adopts reverse coiling, C phase secondary winding 26 adopts the forward coiling, and B phase secondary winding 24 adopts two to become big mixed preface coiling gradually to the centre, also available following table 3 expression:
Table 3
Each sub-winding in the A phase secondary winding 22 sorts according to reverse coiling, each sub-winding in the C phase secondary winding 26 sorts according to the forward coiling, if therefore the output voltage grade of single sub-winding is 700V, safety between each sub-winding in the A phase secondary winding 22 distance only need consider according to 700V, with C mutually in the secondary winding 26 safety between the adjacent sub-winding get final product apart from d3 is equal.And B phase secondary winding 24 adopts two to become big mixed preface coiling gradually to the centre, as shown in the figure, the sub-winding B1 of B phase secondary winding 24 and B be the sub-winding B3 of secondary winding 24 mutually, the sub-winding B3 of B phase secondary winding 24 and B be the sub-winding B5 of secondary winding 24 mutually, the sub-winding B5 of B phase secondary winding 24 and B be the sub-winding B7 of secondary winding 24 mutually, the sub-winding B8 of B phase secondary winding 24 and B be the sub-winding B6 of secondary winding 24 mutually, the sub-winding B6 of B phase secondary winding 24 and B be the sub-winding B4 of secondary winding 24 mutually, the sub-winding B4 of B phase secondary winding 24 and B be the sub-winding B2 of secondary winding 24 mutually, between the sub-winding C1 of the sub-winding B2 of B phase secondary winding 24 and C phase secondary winding 26 all only at interval 1 module, so will bear 700* (1+1)=1400V, therefore, the safety more than between the sub-winding is all considered according to 1400V apart from d2.Two safety distances with the 6300V design of needs compared with prior art reduce (the safety distance of other sub-winding is all with the 700V design) greatly like this, the whole height of transformer has largely and reduces, the use amount unshakable in one's determination of transformer also can reduce greatly, thereby reduces design cost.Simultaneously total safety apart from uniform distribution between each sub-winding of B phase secondary winding 24, like this in the radiating effect that reaches the best, the insulating barrier that the insulating barrier that also can use a plurality of low safety to require replaces two high safety to require, make that the design of insulating barrier is simpler, the cost of insulating barrier is lower.
Equally, if change the vertical transformer among Fig. 7 into horizontal type transformer, then also can adopt the principle of optimality same as described above to design, promptly make the 22 reverse coilings of A phase secondary winding, the 26 forward coilings of C phase secondary winding, B phase secondary winding 24 adopts two to become big mixed preface coiling gradually to the centre, can reach same effect.
In an embodiment of the present utility model, be provided with insulating barrier between the adjacent sub-winding.The material difference of described insulating barrier and/or thickness difference.Different insulating requirements between the sub-winding that can satisfy each phase secondary winding by the material and the thickness difference of insulating barrier.Certainly directly also can satisfy different insulating requirements between the sub-winding of each phase secondary winding by the insulation spacing difference between the sub-winding.
Phase-shifting rectifier transformer of the present utility model can be dry-type transformer or oil-filled transformer, can reach same technique effect.
In another embodiment of the present utility model, also provide a kind of series connection topological frequency converter, comprise the phase-shifting rectifier transformer described in the arbitrary embodiment in front.The A phase secondary winding 22 of phase-shifting rectifier transformer, B phase secondary winding 24 and C phase secondary winding 26 output separately are connected motor 3 through the power cell shown in Fig. 12 respectively.Consult Fig. 1, power cell comprises the A phase power cell that connects A phase secondary winding output, the B phase power cell and the C phase power cell that is connected C phase secondary winding that connects B phase secondary winding, A phase power cell, B phase power cell and C phase power cell comprise N identical subelement respectively, and same N is a natural number.Do not change the one-to-one relationship that transformer secondary winding is connected with complete machine power cell 2 owing to change secondary winding technique order, therefore can not produce any influence the frequency converter complete machine operation logic that constitutes by transformer.Concrete structure about phase-shifting rectifier transformer can not repeat them here referring to aforementioned each embodiment.
To sum up, the utility model is by the secondary winding technique order of regulation transformer, optimize A phase secondary winding 22, safety distance between B phase secondary winding 24 and the C phase secondary winding 26, thereby reduce the design size of transformer, size with the frequency converter complete machine that reduces to be made by transformer reduces, can reduce the manufacturing cost of transformer to a certain extent, can also improve simultaneously the heat-sinking capability of the coil of transformer, be applicable to the optimal design of phase-shifting rectifier transformer of the medium voltage frequency converter of all topological patterns of connecting, comprise horizontal type transformer and vertical transformer, and the transformer of similar special construction.Do not change the one-to-one relationship that transformer secondary winding is connected with the complete machine power cell owing to change secondary winding technique order simultaneously, therefore can not produce any influence, for example volage current transformer structure among volage current transformer structure, the 10KV among 3KV medium voltage frequency converter, the 6KV to the frequency converter complete machine operation logic that constitutes by transformer.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (9)
1. a phase-shifting rectifier transformer comprises iron core (21), and is wound on former limit winding (10), secondary winding (20) and auxiliary winding (28) on the described iron core (21); Described secondary winding (20) comprises A phase secondary winding (22), C phase secondary winding (26), and be arranged on B phase secondary winding (24) between described A phase secondary winding (22) and the described C phase secondary winding (26), it is characterized in that, described A phase secondary winding (22) adopts reverse coiling, and described C phase secondary winding (26) adopts the forward coiling.
2. phase-shifting rectifier transformer according to claim 1 is characterized in that, described B phase secondary winding (24) adopts and mixes the preface coiling.
3. phase-shifting rectifier transformer according to claim 2 is characterized in that, described B phase secondary winding (24) adopts two to become big mixed preface coiling gradually to the centre.
4. phase-shifting rectifier transformer according to claim 1 is characterized in that, described A phase secondary winding (22) comprises N separate sub-winding, is designated as AN;
Described B phase secondary winding (24) comprises N separate sub-winding, is designated as BN;
Described C phase secondary winding (26) comprises each separate sub-winding of N, is designated as CN; Wherein, described N is a natural number.
5. according to arbitrary described phase-shifting rectifier transformer among the claim 1-4, it is characterized in that, be provided with insulating barrier between the adjacent sub-winding.
6. according to arbitrary described phase-shifting rectifier transformer in the claim 5, it is characterized in that the material difference of described insulating barrier and/or thickness difference.
7. according to the described phase-shifting rectifier transformer of claim 1-4, it is characterized in that described phase-shifting rectifier transformer is vertical transformer or horizontal type transformer.
8. according to the described phase-shifting rectifier transformer of claim 1-4, it is characterized in that described phase-shifting rectifier transformer is dry-type transformer or oil-filled transformer.
One kind the series connection topological frequency converter, it is characterized in that, comprise that as arbitrary described phase-shifting rectifier transformer in the claim 1 to 8 described A phase secondary winding (22), B phase secondary winding (24) and C phase secondary winding (26) output separately are connected motor (3) through power cell (2) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201725490U CN202093954U (en) | 2011-05-26 | 2011-05-26 | Phase-shift rectifier transformer and serial-connection topology frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201725490U CN202093954U (en) | 2011-05-26 | 2011-05-26 | Phase-shift rectifier transformer and serial-connection topology frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093954U true CN202093954U (en) | 2011-12-28 |
Family
ID=45369004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201725490U Expired - Lifetime CN202093954U (en) | 2011-05-26 | 2011-05-26 | Phase-shift rectifier transformer and serial-connection topology frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093954U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360794A (en) * | 2011-05-26 | 2012-02-22 | 艾默生网络能源有限公司 | Phase shift rectifier transformer and series connection topology frequency converter |
| CN107546013A (en) * | 2017-09-13 | 2018-01-05 | 新绛县贝塔科技有限公司 | A kind of high frequency transformer |
-
2011
- 2011-05-26 CN CN2011201725490U patent/CN202093954U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360794A (en) * | 2011-05-26 | 2012-02-22 | 艾默生网络能源有限公司 | Phase shift rectifier transformer and series connection topology frequency converter |
| CN102360794B (en) * | 2011-05-26 | 2014-03-26 | 艾默生网络能源有限公司 | Phase shift rectifier transformer and series connection topology frequency converter |
| CN107546013A (en) * | 2017-09-13 | 2018-01-05 | 新绛县贝塔科技有限公司 | A kind of high frequency transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202948822U (en) | Dry-type transformer | |
| CN103337344B (en) | Double-split epoxy resin insulation dry type boosting transformer for wind power and photovoltaic power generation | |
| CN103811159A (en) | Four split transformer | |
| CN202093954U (en) | Phase-shift rectifier transformer and serial-connection topology frequency converter | |
| CN201845649U (en) | Oil-immersed dual-voltage on-load voltage regulating transformer | |
| CN102360794B (en) | Phase shift rectifier transformer and series connection topology frequency converter | |
| CN202067649U (en) | On-load capacity-regulating power transformer | |
| CN202307457U (en) | Dual-ratio transformer | |
| CN201698878U (en) | Dual-voltage transformer | |
| CN202178139U (en) | Two-split rectifier transformer | |
| CN103779051A (en) | Dry type transformer for photovoltaic power generation | |
| CN203325665U (en) | Frequency-conversion phase-shift rectifier transformer | |
| CN202871485U (en) | Dry type transformer for photovoltaic generation | |
| CN201219060Y (en) | Multi-tap dry-type voltage-regulating transformer | |
| CN202025633U (en) | Single iron core type phase-shifting transformer | |
| CN202373436U (en) | Voltage matching compensator for electric network | |
| CN202473566U (en) | 6kV-10kV dual-voltage conversion input dry type power distribution transformer | |
| CN102436918B (en) | Traction transformer for Scott wiring | |
| CN201966814U (en) | Rectifying power supply | |
| CN207367763U (en) | Ocean platform changes input Multiple coil dry-type transformer with 6-10kV twin voltages | |
| CN210956421U (en) | Scott magnetic regulating transformer for glass ball production process | |
| CN109741924B (en) | Traction transformer | |
| CN202332552U (en) | Efficient energy-saving three-phase transformer | |
| CN202103582U (en) | Parallel variable-frequency boosting power supply device without partial discharge | |
| CN202084409U (en) | Inverse Scott dry type transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |