CN218159937U - Foil coil, three-phase transformer - Google Patents

Abstract

The application discloses a foil coil, which comprises a coil body, wherein the coil body is formed by winding a foil conductor, and the foil conductor is provided with a winding head end and a winding tail end; the first leading-out end is formed by integrally extending the winding head end of the foil conductor; and the second leading-out end is formed by integrally extending the winding tail end of the foil conductor. According to the foil coil, the first leading-out end and the second leading-out end are formed by integrally extending the foil conductors, an external connecting piece is not needed, hidden dangers caused by the fact that the conducting bars are not firmly connected are eliminated, and product reliability is improved; the reduction of the connecting pieces simultaneously drives the reduction of the connection fastening work among the connecting pieces and the grinding work of the contact surfaces of the connecting pieces, thereby reducing the material cost and the labor cost; the integration of coil body and first leading-out terminal, second leading-out terminal reduces because of the influence of contact resistance's instability to product resistance loss, improves product performance. The application also discloses a three-phase transformer manufactured by adopting the foil coil.

Description

Foil coil, three-phase transformer

Technical Field

The application relates to the technical field of power equipment, in particular to a foil coil in a transformer and a three-phase transformer adopting the foil coil.

Background

Foil coils are commonly used in low voltage, small capacity transformers. For example, when the foil type three-phase transformer is applied to an oil-immersed three-phase transformer, the first end of the foil type coil is connected with the outside of an oil tank through a low-voltage bushing, and the tail end of the foil type coil needs to be connected with the three-phase coil.

After the existing foil coil is wound, generally, conductive bars or lugs are externally connected to the head end and the tail end of a conductive foil plate to serve as outgoing lines of the winding. The conductor bars are usually fixed by bolting, but also by welding or cold pressing with cold press tongs. However, the existing foil coil lead-out structure has the following disadvantages: firstly, connecting pieces such as a conductive bar and a lug plate are adopted as outgoing lines, so that a plurality of members needing to be connected are caused, and the connection is not firm and the hidden trouble of falling is easily caused; secondly, the outgoing line comprises a plurality of different conductors, and when current flows among the different conductors, the resistance loss is increased; thirdly, the contact surface between each connecting piece of lead-out wire is more, in order to ensure that contact resistance is good, still need polish the contact surface of connecting piece, increases the assembly process.

SUMMERY OF THE UTILITY MODEL

In order to solve one of the technical problems existing in the prior art, the application provides a foil coil, adopts the leading-out terminal of integral structure to reduce accessory and assembly process, improve the electric conductive property of coil.

In addition, this application still provides a three-phase transformer, uses above-mentioned foil coil.

According to the utility model discloses foil coil of first aspect embodiment includes: a coil body wound from a foil conductor, the foil conductor having a winding head end and a winding tail end; a first lead-out for connecting the coil body to a low-voltage bushing, the first lead-out being integrally extended from a winding head end of the foil conductor; and the second leading-out end is used for connecting different coil bodies and is formed by integrally extending the winding tail end of the foil conductor.

According to the utility model discloses foil coil of first aspect embodiment has following beneficial effect at least: according to the foil coil, the first leading-out end and the second leading-out end for connection are formed by integrally extending the foil conductors, external connecting pieces such as a conductive bar are not needed, the connecting pieces are reduced, hidden dangers caused by insecure connection of the conductive bar are eliminated, and the reliability of a product is improved; the reduction of the connecting pieces simultaneously drives the reduction of the connection fastening work among the connecting pieces and the grinding work of the contact surfaces of the connecting pieces, thereby reducing the material cost and the labor cost; the integration of coil body and first leading-out terminal, second leading-out terminal reduces because of the influence of contact resistance's instability to product resistance loss, improves product performance.

According to the utility model discloses the foil coil of first aspect, first leading-out end and/or second leading-out end department is provided with the wire clamp of fixed usefulness. Because the first leading-out end and the second leading-out end are formed by integrally extending the foil conductor, the rigidity of the first leading-out end and the second leading-out end is insufficient, and the first leading-out end and the second leading-out end can be effectively fixed through the wire clamp, so that the problem of insufficient rigidity is solved.

According to the utility model discloses a three-phase transformer of second aspect embodiment, including a phase coil, b phase coil and c phase coil, a phase coil, b phase coil and c phase coil be the foil coil of this application first aspect; the first leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil are respectively connected with corresponding low-voltage sleeves, and the second leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil are connected together.

According to the utility model discloses three-phase transformer of second aspect embodiment has following beneficial effect at least: adopt the three-phase transformer of this application first aspect foil formula coil preparation, because foil formula coil adopts the leading-out terminal of integrated configuration to reduce the cost of manufacture of whole transformer, and the transformer reliability of making out is high, the stable performance, has good competitiveness.

According to the utility model discloses the three-phase transformer of second aspect, a phase coil b phase coil with the second of c phase coil is drawn forth the end and is connected to zero phase.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

Fig. 1 is a schematic structural view of a three-phase transformer of the present embodiment;

fig. 2 is a schematic view of the connection of the first pigtail to the low-voltage bushing.

The reference numbers illustrate: 100. a coil body; 110. a first leading-out terminal; 120. a wire clamp; 200. a low-pressure bushing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application 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 merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be understood in a broad sense, e.g. it may be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media or structures, or may be in communication between two elements or in interactive relation between two elements.

In the description of the present application, it is to be noted that several means are one or more, plural (or plural) means are two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.

The embodiments of the present application will be further explained with reference to the drawings.

Referring to fig. 1, the present embodiment provides a three-phase transformer including an a-phase coil, a b-phase coil, and a c-phase coil. Wherein, a phase coil, b phase coil and c phase coil are all foil coil 100.

Specifically, each foil coil 100 includes a coil body formed by winding a foil conductor, the foil conductor is provided with a winding head end and a winding tail end, the winding head end integrally extends to obtain a first leading-out end 110, and the winding tail end integrally extends to obtain a second leading-out end.

As shown in fig. 2, the first terminals 110 of the a-phase coil, the b-phase coil and the c-phase coil of the three-phase transformer are respectively connected to corresponding low-voltage bushings 200 of the transformer. In addition, the second leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil are connected together and connected to a zero phase to form Y-type connection.

It is easy to understand that, in order to better fix the terminals, in the present embodiment, the wire clamp 120 for fixing is disposed at both the first terminal 110 and the second terminal of the foil coil 100, and the first terminal 110 and the second terminal can be effectively fixed by the wire clamp 120, so as to compensate for the insufficient rigidity.

Since the foil coil 100 provided by this embodiment adopts the leading-out terminals of an integrated structure, and the first leading-out terminal and the second leading-out terminal are both formed by integrally extending foil conductors, external connecting members such as a conductive bar are not required to be adopted, so that the number of connecting members is reduced, the hidden danger caused by the insecure connection of the conductive bar is eliminated, and the reliability of the product is increased; the reduction of the connecting pieces simultaneously drives the reduction of the connection fastening work among the connecting pieces and the grinding work of the contact surfaces of the connecting pieces, thereby reducing the material cost and the labor cost; the integration of coil body and first leading-out terminal, second leading-out terminal reduces because of the influence of contact resistance's instability to product resistance loss, improves product performance. Therefore, the three-phase transformer using the foil coil 100 can reduce the manufacturing cost of the whole transformer, and the manufactured transformer has high reliability, stable performance, firmness, beauty and good competitiveness.

Further, the preparation method of the foil coil 100 provided in this embodiment is as follows: (1) In the product design stage, the initial, passing and final positions of the coil leading-out ends are determined, so that the length required for directly connecting the first leading-out end 110 of the coil with the low-voltage sleeve 200 and the length required for connecting the second leading-out end are determined; (2) Before the foil coil 100 is wound, the foil coil needs to be reserved according to the length required by the first leading-out end 110, and the reserved first leading-out end 110 is reasonably fixed, so that the winding of the foil coil is prevented from being influenced; (3) After the foil type coil is wound, cutting the foil conductor according to the length required by the second leading-out end to obtain a second leading-out end; (4) When the lead is sleeved, the first leading-out terminal 110 is directly connected with the low-voltage sleeve 200 after being clamped and fixed by the lead clamp 120, and the second leading-out terminal is connected with each other after being fixed by the lead clamp and finally connected to the zero phase, so that the connection of the leading-out terminals is completed.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.

Claims (4)

1. A foil coil, comprising:

the coil comprises a coil body, wherein the coil body is formed by winding a foil conductor, and the foil conductor is provided with a winding head end and a winding tail end;

a first lead-out for connecting the coil body to a low-voltage bushing, the first lead-out being integrally extended from a winding head end of the foil conductor;

and the second leading-out end is used for connecting different coil bodies and is formed by integrally extending the winding tail end of the foil conductor.

2. Foil-type coil according to claim 1, wherein a wire clamp for fixation is provided at the first lead-out end and/or the second lead-out end.

3. A three-phase transformer comprising an a-phase coil, a b-phase coil, and a c-phase coil, characterized in that:

the phase a coil, the phase b coil, and the phase c coil are foil coils according to claim 1 or 2;

the first leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil are respectively connected with corresponding low-voltage sleeves, and the second leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil are connected together.

4. The three-phase transformer of claim 3, wherein the second terminals of the a-phase coil, the b-phase coil, and the c-phase coil are connected to a zero phase.

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