CN219832393U - High-voltage side cable connection structure of dry-type transformer and transformer - Google Patents
High-voltage side cable connection structure of dry-type transformer and transformer Download PDFInfo
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- CN219832393U CN219832393U CN202320790228.XU CN202320790228U CN219832393U CN 219832393 U CN219832393 U CN 219832393U CN 202320790228 U CN202320790228 U CN 202320790228U CN 219832393 U CN219832393 U CN 219832393U
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- 238000009413 insulation Methods 0.000 abstract description 7
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- 238000009434 installation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000009422 external insulation Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
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Abstract
The utility model relates to a high-voltage side cable connection structure of a dry type transformer and the transformer, the connection structure is suitable for the dry type transformer with 35kV and above, and the connection structure comprises: the high-voltage side outlet terminal is arranged on a high-voltage coil or a transformer body of the transformer; the connecting interface is fixed through the fixing structure and is connected with the high-voltage side outgoing line terminal through the connecting lead; one end of the T-shaped head is in matched sealing connection with the connecting interface, and the other end of the T-shaped head is connected with the high-voltage cable. The connecting structure realizes the convenient connection between the high-voltage output end of the transformer and the high-voltage cable, and reduces the insulation space of the connecting part; and the side connection interface of the transformer and the high-voltage coil of the transformer are independently designed and arranged in a split mode, so that failure faults at the interface part can not affect the transformer. The low-voltage side of the transformer is connected with the frequency converter through the conducting bars, so that the connection structure is simplified, the risk of uneven flow of the cable is eliminated, and the follow-up wiring operation and maintenance are ensured to be more reliable and convenient.
Description
Technical Field
The utility model relates to the field of dry transformers, in particular to a high-voltage side cable connection structure of a dry transformer and the dry transformer.
Background
Under the current market environment, the 66kV dry transformation for the offshore wind power has obvious cost advantage compared with oil transformation, and the dry transformer has the characteristics of oil free and flame retardance, and has very important value for improving the safety, reliability and environmental protection characteristics of the offshore wind power; the conventional 66kV dry-type transformer has large volume, and the insulation and interface problems in the miniaturization process must be solved in order to realize the application of the 66kV dry-type transformer in the engine room; the development process analysis of the 66kV compact dry-type transformer is as follows: the external insulation treatment and the compression of an insulation space are key to realizing compactness, and the external insulation treatment mode and the cable interface mode of 35kV are taken as the way, so that multiple difficulties and risks are faced in the miniaturized development process of the product.
The compact dry-type transformer for offshore wind power provides an effective solution for installing and using high-voltage-grade dry-type products in compact space and realizing high reliability and convenient operation and maintenance. The conventional 66kV dry-type transformer has the following problems when applied to a cabin:
the current dry-type transformer high-voltage cable wiring adopts umbrella skirt to realize the connection of transformer high-voltage terminal and cable. The length of the 66kV umbrella skirt is more than one meter and six, the whole size is large, and the umbrella skirt needs a large installation space after being arranged into the transformer housing, so that the realization of miniaturization of products is affected; the umbrella skirt is connected with an external exposed electrode, an air insulation gap of the external exposed electrode needs to be ensured to be more than 630mm for a 66kV dry-type transformer, the size of a housing is increased, the integral cost of a cabin is increased, and extremely high external discharge failure risks exist in the long-term use process of the exposed electrode under the offshore environment.
The low-voltage side of the transformer is connected by a cable, so that the problem of uneven current carrying of the cable is easy to occur to a high-power product, and the cable is caused to excessively heat to cause failure.
Chinese patent application CN202221182945.6 discloses a high voltage sealed dry transformer, CN202221183128.2 discloses a combined cable terminal for a dry transformer. Taking the two patent applications as examples, in the prior art, the transformer coil is easily damaged in the process of installation and operation in a mode of casting the transformer coil into a whole; failure of the connection part is very easy to cause serious failure results due to failure of the transformer coil; the high-voltage wire inlet terminal is connected with the coil and is far away from the housing, and the installation and subsequent operation and maintenance of the cable accessories are all required to be carried out in the housing, so that hidden danger is brought to the operation safety of high-voltage grade products.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a high-voltage side cable connection structure of a dry-type transformer and the transformer.
The aim of the utility model can be achieved by the following technical scheme:
as a first aspect of the present utility model, there is provided a dry-type transformer high-voltage side cable connection structure, the connection structure comprising:
the high-voltage side outlet terminal is arranged on a high-voltage coil or a transformer body of the transformer;
the connecting interface is fixed through the fixing structure and is connected with the high-voltage side outgoing terminal through a connecting lead;
and one end of the T-shaped head is in matched sealing connection with the connecting interface, and the other end of the T-shaped head is connected with the high-voltage cable.
Furthermore, the connecting interface is a connecting frustum matched with the T-shaped head.
Further, the connection interface is a high-voltage sleeve matched with the T-shaped head.
Further, the high-voltage bushing comprises three-phase bushings corresponding to ABC three phases at the high-voltage side of the transformer respectively.
Further, the three-phase bushings are intensively arranged at an unspecified place in the transformer housing.
Further, the three-phase bushings are distributed and arranged at a plurality of unspecified places in the transformer housing.
Further, the connecting interface is arranged in the transformer housing and close to the housing wall, and a door is arranged at the position of the transformer housing corresponding to the connecting interface.
Further, the connection interface is arranged in a cable wiring compartment isolated from the dry-type transformer body.
As a second aspect of the present utility model, there is provided a dry-type transformer including the high-voltage side cable connection structure as described above, the dry-type transformer being provided with a low-voltage lead-out busbar, the low-voltage side of the dry-type transformer being connected to a frequency converter through a conductive bar.
Furthermore, the low-voltage lead-out busbar is arranged on the outer side of the transformer housing, and equipment on the outer side of the transformer housing is arranged on the same side face of the transformer housing with the structure.
Compared with the prior art, the utility model has the following beneficial effects:
1) The insulation space distance required by the high-voltage-class dry-type transformer is greatly reduced, and a feasible solution is provided for the technical realization of compact products.
2) The high-voltage wiring position is transferred to the panel of the housing from the high-voltage coil outgoing terminal, and an independent isolation cabin and an independent door are arranged, so that the requirements of external installation and operation and maintenance of the housing can be met. The device can also be arranged in the housing and close to the panel of the housing, and external operation and maintenance can be realized through the opening of the housing.
3) The sleeve seat is decoupled with the winding of the key component of the transformer core, so that operations such as wiring, operation and maintenance are decoupled with the transformer coil, the risk of winding failure is reduced, and the transformer core has higher safety value especially for the cabin installation environment with vibration.
4) When the cable connection compartment and the dry-type transformer body are adopted, the influence of electric fields between accessory connection and the transformer body can be reduced, and the method has direct help for improving the reliability of 66kV compact dry-type transformer at sea.
5) Changing the connection mode between the low-voltage side of the transformer and the frequency converter into conductive bar connection; the transformer is provided with a low-voltage outlet busbar which is connected with the busbar at the side of the frequency converter at an interface outside the housing; the connecting interface is positioned at a specific position of the housing, so that the connecting structure is simplified, the connecting cost is reduced, and the risk of uneven flow of the cable is eliminated.
Drawings
FIG. 1 is a schematic view of a high-voltage side cable connection structure of a dry-type transformer according to the present utility model;
FIG. 2 is a side view of the low voltage side of a dry-type transformer of the present utility model;
FIG. 3 is a side view of the high side of a dry-type transformer of the present utility model;
the reference numerals in the figures indicate: 1. high-voltage coil 2, high-voltage side wire outlet terminal, 3, fixed knot constructs, 4, connection interface, 5, T type head, 6, high-voltage cable, 7, connecting wire, 8, low pressure draws forth female row, 9, transformer housing, 10, water-cooling knapsack.
Detailed Description
The utility model will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present utility model is not limited to the following examples.
Example 1
As one embodiment of the present utility model, an interface method and a connection structure for connecting a high-voltage side cable of a dry-type transformer, the connection method and the structure being applicable to a dry-type transformer of 35kV and above, the structure specifically including, as shown in fig. 1: the high-voltage side outgoing terminal 2 may be provided at any position of the high-voltage coil 1 of the transformer, or may be provided at a specific position of the transformer body via a lead wire. The high-voltage-side outlet terminal 2 has a specifically designed interface, is connected to the connection interface 4 via the connection lead 7, and is connected to the T-head 5 via the connection interface 4. The connecting leads 7 are formed by conductors and external insulation for the purpose of transmitting electrical energy between the high-voltage coil 1 and the connection interface 4. One end of the T-shaped head 5 is in matched sealing connection with the connecting interface 4, and the other end of the T-shaped head is connected with the high-voltage cable 6. Wherein the connection interface 4 is fixed by the fixing structure 3. The fixing structure 3 is used for fixing the connection interface 4 to a specific position on the dry-type transformer body, in the dry-type transformer housing, on the dry-type transformer housing or outside the transformer housing. Fig. 1 only shows one way of fixing, and in practice the fixing structure 3 may be located in other parts of the transformer body and its housing; the fixing structure 3 may be an independent structure in the space as shown in the figure, or may be a structural panel at a certain place on the housing.
The connection interface 4 at the transformer side is a connection frustum or a high-voltage sleeve which can be connected by matching with the T-shaped head 5. The high-voltage sleeve consists of an insulating material and a metal conductive material and has an external structure which meets the sealing connection with the T-shaped head 5, meanwhile, the sleeve is an independent part and is fixed in a specific space/area by a mechanical structure outside the transformer, namely a fixed structure 3, and one end of the sleeve is connected with a conductor of the T-shaped head 5; the other end is connected with the transformer coil through a connecting lead 7 which is sealed and insulated; one end of the T-shaped head 5 is connected with the sleeve, and the other end is connected with the high-voltage cable 6. Through the connection, the electric energy is sent out through the high-voltage side of the transformer and the high-voltage cable.
The high-voltage sleeve consists of three-phase sleeves, which correspond to ABC three phases at the high-voltage side of the transformer respectively; according to design and installation operation and maintenance requirements, the three-phase sleeve can be arranged in a certain space inside the transformer housing 9 in a concentrated manner, and can be distributed in different positions inside/on the housing in a scattered manner; the transformer can be placed in the same housing space with the transformer body, and also can be placed in an independent cable wiring compartment, so that the electrical isolation between the connector and the transformer body is realized.
Example 2
Another embodiment of the present utility model is a transformer having the high-voltage side cable connection structure of the dry-type transformer as described in the above examples. Further, the low-voltage side of the transformer is connected with the frequency converter by a conductive bar; the transformer side is provided with the low pressure and draws forth female row 8, and the low pressure draws forth female row 8 and sets up in the specific position of housing, and the female row of side with the converter is connected outside housing 9 through the wire row, has simplified connection structure, has reduced connection cost through the mode of wire row connection, has eliminated the cable risk of not equalizing flow simultaneously.
Further, the arrangement environment of the dry-type transformer for offshore wind power is three-faced to the wall, and one face is faced to the door opening. The low-voltage leading-out busbar 8 is horizontally arranged, and equipment or structures of the low-voltage leading-out busbar 8, the water-cooling backpack 10 and the like arranged on the outer side of the transformer housing 9 are arranged on the same side face facing the door opening, so that subsequent operation and maintenance are facilitated.
The dry-type transformer housing 9 is narrow in internal space, after the T-shaped head 5 is used, wiring of the high-voltage cable 6 can be concentrated in a fixed area in the transformer housing 9, and sealing design of external insulation of products is achieved, so that insulation gap between an electrified body and the ground is greatly reduced. Through structural design improvement, the internal insulation space distance of the high-voltage-class dry-type transformer is greatly reduced, the area is provided with the conditions of wiring and operation and maintenance outside the transformer housing 9, and the problem of insufficient operation and maintenance space inside the compact product housing is solved.
The compact transformer provided by the embodiment also has the following advantages: compared with the traditional 66kV dry-type transformer, the transformer volume is obviously reduced; the connection part of the cable terminal is decoupled from the transformer winding, so that precondition guarantee is provided for solid insulation sealing of the external electrode of the high-voltage winding; the connection part of the cable accessory is connected with the high-voltage coil through a detachable lead, so that the influence of faults at the connection part on the transformer is effectively isolated; the connection part of the transformer and the high-voltage cable can realize modularized design; the installation and operation of the outer part of the housing can be realized.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A dry-type transformer high-voltage side cable connection structure, characterized in that the connection structure comprises:
the high-voltage side outlet terminal (2) is arranged on a high-voltage coil (1) of the transformer or a transformer body;
the connecting interface (4) is fixed through the fixing structure (3) and is connected with the high-voltage side outgoing terminal (2) through a connecting lead (7);
and one end of the T-shaped head (5) is in matched sealing connection with the connecting interface (4), and the other end of the T-shaped head is connected with the high-voltage cable (6).
2. A dry-type transformer high-voltage side cable connection structure according to claim 1, characterized in that the connection interface (4) is a connection frustum which cooperates with a T-shaped head.
3. A dry-type transformer high-voltage side cable connection structure according to claim 1, characterized in that the connection interface (4) is a high-voltage bushing cooperating with a T-head.
4. A dry-type transformer high-voltage side cable connection structure according to claim 3, wherein the high-voltage bushings comprise three-phase bushings corresponding to the three phases ABC of the high-voltage side of the transformer, respectively.
5. A dry-type transformer high-voltage side cable connection structure according to claim 4, characterized in that the three-phase bushings are arranged centrally in one place within the transformer enclosure (9).
6. A dry-type transformer high-voltage side cable connection structure according to claim 4, characterized in that the three-phase bushings are arranged in a plurality of places in the transformer enclosure (9) in a scattered manner.
7. The high-voltage side cable connection structure of the dry-type transformer according to claim 1, wherein the connection interface (4) is arranged in a position, close to a housing wall, in the transformer housing (9), and a door is arranged at a position, corresponding to the connection interface (4), of the transformer housing (9).
8. A dry-type transformer high-voltage side cable connection structure according to claim 1, characterized in that the connection interface (4) is arranged in a cable connection compartment isolated from the dry-type transformer body.
9. A dry-type transformer, characterized in that the dry-type transformer comprises a high-voltage side cable connection structure according to any one of claims 1-8, the dry-type transformer being provided with a low-voltage lead-out busbar (8), the low-voltage side of the dry-type transformer being connected to a frequency converter via a conductor bar.
10. A dry transformer according to claim 9, characterized in that the low voltage outlet busbar (8) is arranged horizontally outside the transformer enclosure (9), and that the equipment outside the transformer enclosure (9) is arranged on the same side of the transformer enclosure (9) as the structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320790228.XU CN219832393U (en) | 2023-04-11 | 2023-04-11 | High-voltage side cable connection structure of dry-type transformer and transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320790228.XU CN219832393U (en) | 2023-04-11 | 2023-04-11 | High-voltage side cable connection structure of dry-type transformer and transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219832393U true CN219832393U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320790228.XU Active CN219832393U (en) | 2023-04-11 | 2023-04-11 | High-voltage side cable connection structure of dry-type transformer and transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219832393U (en) |
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2023
- 2023-04-11 CN CN202320790228.XU patent/CN219832393U/en active Active
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